This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Advantage Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left;">www.morganstanley.com/im/shareholderreports</span>

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$138	1.17%

Expenses Paid, Amount

$ 138

Expense Ratio, Percent

1.17%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the Russell 1000^® Growth Index:

↑ Stock selection in information technology, led by a position in an enterprise analytics platform and Bitcoin developing company

↑ Average overweight and stock selection in consumer discretionary, led by a food delivery company

↑ No exposure to consumer staples, a sector that underperformed in the index

↓ Stock selection in health care, led lower by a biopharmaceutical royalties acquirer and a next-generation sequencing company (the sequencing company was sold during the period)

↓ Stock selection and average overweight in financials,

↓ Average underweight in information technology, which was one of the stronger performing sectors in the period

Line Graph [Table Text Block]

	Class A with maximum sales charge	S&P 500^® Index	Russell 1000^® Growth Index
12/14	$9,472	$10,000	$10,000
1/15	$9,580	$9,700	$9,847
2/15	$10,295	$10,257	$10,503
3/15	$10,210	$10,095	$10,384
4/15	$10,170	$10,192	$10,436
5/15	$10,153	$10,323	$10,583
6/15	$10,057	$10,123	$10,396
7/15	$10,749	$10,335	$10,749
8/15	$10,045	$9,712	$10,096
9/15	$9,817	$9,471	$9,846
10/15	$10,634	$10,270	$10,694
11/15	$10,691	$10,301	$10,724
12/15	$10,628	$10,138	$10,567
1/16	$9,967	$9,635	$9,977
2/16	$9,733	$9,622	$9,973
3/16	$10,294	$10,275	$10,645
4/16	$10,375	$10,315	$10,548
5/16	$10,504	$10,500	$10,753
6/16	$10,597	$10,527	$10,711
7/16	$11,109	$10,915	$11,216
8/16	$11,166	$10,931	$11,160
9/16	$11,241	$10,933	$11,201
10/16	$11,040	$10,733	$10,938
11/16	$11,034	$11,131	$11,176
12/16	$10,891	$11,351	$11,314
1/17	$11,389	$11,566	$11,696
2/17	$11,723	$12,025	$12,182
3/17	$11,913	$12,039	$12,322
4/17	$12,392	$12,163	$12,604
5/17	$12,815	$12,334	$12,932
6/17	$12,651	$12,411	$12,898
7/17	$13,005	$12,666	$13,241
8/17	$13,126	$12,705	$13,483
9/17	$13,113	$12,967	$13,659
10/17	$13,703	$13,270	$14,188
11/17	$14,134	$13,677	$14,619
12/17	$14,336	$13,829	$14,733
1/18	$15,471	$14,621	$15,776
2/18	$15,356	$14,082	$15,363
3/18	$15,002	$13,724	$14,941
4/18	$15,172	$13,777	$14,994
5/18	$15,886	$14,108	$15,651
6/18	$16,110	$14,195	$15,801
7/18	$16,112	$14,724	$16,265
8/18	$16,982	$15,203	$17,155
9/18	$17,044	$15,290	$17,251
10/18	$15,628	$14,245	$15,708
11/18	$15,945	$14,535	$15,875
12/18	$14,820	$13,223	$14,510
1/19	$16,349	$14,282	$15,814
2/19	$16,970	$14,741	$16,380
3/19	$17,482	$15,027	$16,846
4/19	$18,341	$15,636	$17,607
5/19	$17,778	$14,642	$16,495
6/19	$18,737	$15,674	$17,628
7/19	$18,983	$15,899	$18,026
8/19	$18,579	$15,648	$17,888
9/19	$18,196	$15,940	$17,890
10/19	$17,901	$16,286	$18,394
11/19	$18,745	$16,877	$19,210
12/19	$18,702	$17,386	$19,790
1/20	$19,769	$17,379	$20,232
2/20	$18,716	$15,949	$18,854
3/20	$16,885	$13,979	$17,000
4/20	$19,886	$15,771	$19,515
5/20	$22,800	$16,522	$20,825
6/20	$24,690	$16,850	$21,732
7/20	$26,875	$17,801	$23,404
8/20	$29,031	$19,080	$25,819
9/20	$28,082	$18,355	$24,604
10/20	$27,508	$17,867	$23,769
11/20	$31,290	$19,823	$26,203
12/20	$32,592	$20,585	$27,408
1/21	$31,948	$20,377	$27,205
2/21	$33,748	$20,939	$27,199
3/21	$31,692	$21,856	$27,666
4/21	$33,313	$23,022	$29,548
5/21	$32,522	$23,183	$29,140
6/21	$35,315	$23,724	$30,968
7/21	$35,260	$24,288	$31,988
8/21	$35,772	$25,026	$33,184
9/21	$33,407	$23,863	$31,326
10/21	$35,105	$25,534	$34,039
11/21	$33,507	$25,357	$34,247
12/21	$31,053	$26,494	$34,971
1/22	$25,364	$25,123	$31,970
2/22	$24,344	$24,371	$30,612
3/22	$23,266	$25,276	$31,809
4/22	$18,732	$23,071	$27,968
5/22	$15,883	$23,114	$27,318
6/22	$14,420	$21,206	$25,154
7/22	$16,393	$23,161	$28,173
8/22	$16,663	$22,217	$26,861
9/22	$14,940	$20,170	$24,249
10/22	$15,681	$21,804	$25,667
11/22	$15,565	$23,022	$26,836
12/22	$14,063	$21,696	$24,782
1/23	$16,274	$23,059	$26,847
2/23	$15,832	$22,496	$26,528
3/23	$16,765	$23,322	$28,342
4/23	$15,906	$23,686	$28,621
5/23	$17,564	$23,789	$29,926
6/23	$18,952	$25,361	$31,972
7/23	$20,204	$26,176	$33,050
8/23	$17,957	$25,759	$32,753
9/23	$16,888	$24,531	$30,972
10/23	$15,685	$24,015	$30,531
11/23	$18,804	$26,208	$33,859
12/23	$20,511	$27,399	$35,358
1/24	$20,106	$27,859	$36,240
2/24	$22,477	$29,347	$38,713
3/24	$22,685	$30,291	$39,394
4/24	$20,511	$29,054	$37,723
5/24	$20,032	$30,494	$39,981
6/24	$20,757	$31,589	$42,677
7/24	$20,941	$31,973	$41,951
8/24	$21,777	$32,749	$42,825
9/24	$22,931	$33,448	$44,038
10/24	$23,901	$33,145	$43,893
11/24	$28,544	$35,090	$46,740
12/24	$27,844	$34,254	$47,152

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class A	35.75%	8.29%	11.39%
Class A, with 5.25% maximum front end sales charge	28.59%	7.12%	10.78%
S&P 500^® Index	25.02%	14.53%	13.10%
Russell 1000^® Growth Index	33.36%	18.96%	16.78%

AssetsNet

$ 194,996,435

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 877,326

InvestmentCompanyPortfolioTurnover

57.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$194,996,435
# of Portfolio Holdings	28
Portfolio Turnover Rate	57%
Total Advisory Fees Paid	$877,326

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Real Estate	1.6%
Short-Term Investments	2.3%
Industrials	2.6%
Investment Company	3.0%
Health Care	5.8%
Financals	8.0%
Communication Services	10.7%
Information Technology	31.6%
Consumer Discretionary	34.4%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Tesla, Inc.	9.5%
Cloudflare, Inc.	9.4%
DoorDash, Inc.	6.4%
Shopify, Inc.	6.3%
ROBLOX Corp.	5.4%
Trade Desk, Inc.	5.3%
MercadoLibre, Inc.	4.9%
Amazon.com, Inc.	4.9%
Snowflake, Inc.	4.9%
Crowdstrike Holdings, Inc.	3.7%
Total	60.7%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155898

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Advantage Portfolio

Class Name

Class C

Trading Symbol

MSPRX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Advantage Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$225	1.92%

Expenses Paid, Amount

$ 225

Expense Ratio, Percent

1.92%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the Russell 1000^® Growth Index:

↑ Stock selection in information technology, led by a position in an enterprise analytics platform and Bitcoin developing company

↑ Average overweight and stock selection in consumer discretionary, led by a food delivery company

↑ No exposure to consumer staples, a sector that underperformed in the index

↓ Stock selection in health care, led lower by a biopharmaceutical royalties acquirer and a next-generation sequencing company (the sequencing company was sold during the period)

↓ Stock selection and average overweight in financials,

↓ Average underweight in information technology, which was one of the stronger performing sectors in the period

Line Graph [Table Text Block]

	Class C	S&P 500^® Index	Russell 1000^® Growth Index
4/15	$10,000	$10,000	$10,000
5/15	$9,978	$10,129	$10,141
6/15	$9,873	$9,933	$9,962
7/15	$10,548	$10,141	$10,300
8/15	$9,851	$9,529	$9,674
9/15	$9,616	$9,293	$9,435
10/15	$10,414	$10,077	$10,248
11/15	$10,465	$10,107	$10,276
12/15	$10,391	$9,947	$10,125
1/16	$9,740	$9,454	$9,560
2/16	$9,505	$9,441	$9,556
3/16	$10,048	$10,082	$10,201
4/16	$10,120	$10,121	$10,107
5/16	$10,240	$10,302	$10,304
6/16	$10,325	$10,329	$10,263
7/16	$10,813	$10,710	$10,748
8/16	$10,868	$10,725	$10,694
9/16	$10,935	$10,727	$10,733
10/16	$10,727	$10,531	$10,481
11/16	$10,721	$10,921	$10,709
12/16	$10,568	$11,137	$10,842
1/17	$11,049	$11,348	$11,207
2/17	$11,363	$11,799	$11,673
3/17	$11,542	$11,813	$11,808
4/17	$12,003	$11,934	$12,078
5/17	$12,404	$12,102	$12,392
6/17	$12,238	$12,178	$12,359
7/17	$12,571	$12,428	$12,688
8/17	$12,682	$12,466	$12,920
9/17	$12,664	$12,723	$13,088
10/17	$13,221	$13,020	$13,596
11/17	$13,630	$13,419	$14,009
12/17	$13,820	$13,569	$14,118
1/18	$14,902	$14,345	$15,118
2/18	$14,783	$13,817	$14,721
3/18	$14,431	$13,466	$14,317
4/18	$14,590	$13,517	$14,367
5/18	$15,267	$13,843	$14,997
6/18	$15,480	$13,928	$15,142
7/18	$15,468	$14,446	$15,586
8/18	$16,292	$14,917	$16,438
9/18	$16,346	$15,002	$16,530
10/18	$14,976	$13,977	$15,052
11/18	$15,272	$14,261	$15,212
12/18	$14,185	$12,974	$13,904
1/19	$15,639	$14,013	$15,154
2/19	$16,225	$14,463	$15,696
3/19	$16,697	$14,744	$16,143
4/19	$17,509	$15,341	$16,872
5/19	$16,959	$14,366	$15,806
6/19	$17,869	$15,379	$16,892
7/19	$18,095	$15,600	$17,273
8/19	$17,693	$15,353	$17,141
9/19	$17,318	$15,640	$17,143
10/19	$17,029	$15,979	$17,626
11/19	$17,820	$16,559	$18,408
12/19	$17,770	$17,059	$18,964
1/20	$18,771	$17,052	$19,387
2/20	$17,763	$15,648	$18,067
3/20	$16,013	$13,716	$16,290
4/20	$18,850	$15,474	$18,700
5/20	$21,601	$16,211	$19,956
6/20	$23,387	$16,533	$20,825
7/20	$25,439	$17,465	$22,427
8/20	$27,462	$18,721	$24,741
9/20	$26,547	$18,009	$23,577
10/20	$25,993	$17,531	$22,776
11/20	$29,543	$19,449	$25,108
12/20	$30,759	$20,197	$26,263
1/21	$30,136	$19,993	$26,069
2/21	$31,809	$20,545	$26,063
3/21	$29,854	$21,444	$26,511
4/21	$31,368	$22,589	$28,314
5/21	$30,607	$22,747	$27,923
6/21	$33,209	$23,278	$29,675
7/21	$33,140	$23,831	$30,653
8/21	$33,604	$24,555	$31,799
9/21	$31,360	$23,413	$30,018
10/21	$32,935	$25,054	$32,618
11/21	$31,421	$24,880	$32,817
12/21	$29,096	$25,995	$33,511
1/22	$23,760	$24,650	$30,635
2/22	$22,786	$23,912	$29,334
3/22	$21,765	$24,800	$30,481
4/22	$17,517	$22,637	$26,800
5/22	$14,835	$22,679	$26,177
6/22	$13,460	$20,807	$24,104
7/22	$15,293	$22,725	$26,997
8/22	$15,541	$21,798	$25,739
9/22	$13,918	$19,791	$23,237
10/22	$14,605	$21,393	$24,595
11/22	$14,491	$22,589	$25,716
12/22	$13,088	$21,287	$23,747
1/23	$15,135	$22,625	$25,726
2/23	$14,713	$22,073	$25,421
3/23	$15,569	$22,883	$27,158
4/23	$14,763	$23,240	$27,426
5/23	$16,302	$23,341	$28,676
6/23	$17,590	$24,883	$30,637
7/23	$18,753	$25,683	$31,669
8/23	$16,667	$25,274	$31,385
9/23	$15,675	$24,069	$29,678
10/23	$14,558	$23,563	$29,256
11/23	$17,454	$25,715	$32,445
12/23	$19,038	$26,883	$33,882
1/24	$18,662	$27,335	$34,727
2/24	$20,862	$28,794	$37,096
3/24	$21,056	$29,721	$37,749
4/24	$19,038	$28,507	$36,148
5/24	$18,594	$29,920	$38,312
6/24	$19,266	$30,994	$40,895
7/24	$19,437	$31,371	$40,200
8/24	$20,212	$32,132	$41,037
9/24	$21,284	$32,818	$42,200
10/24	$22,185	$32,521	$42,060
11/24	$26,494	$34,430	$44,788
12/24	$25,844	$33,609	$45,183

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 4/30/15 (Inception)
Class C, with conversion to Class A after 8 years	34.81%	7.51%	10.32%
Class C, with 1% maximum contingent deferred sales charge and conversion to Class A after 8 years	33.81%	7.51%	10.32%
S&P 500^® Index	25.02%	14.53%	13.35%
Russell 1000^® Growth Index	33.36%	18.96%	16.88%

Performance Inception Date

Apr. 30, 2015

AssetsNet

$ 194,996,435

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 877,326

InvestmentCompanyPortfolioTurnover

57.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$194,996,435
# of Portfolio Holdings	28
Portfolio Turnover Rate	57%
Total Advisory Fees Paid	$877,326

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Real Estate	1.6%
Short-Term Investments	2.3%
Industrials	2.6%
Investment Company	3.0%
Health Care	5.8%
Financals	8.0%
Communication Services	10.7%
Information Technology	31.6%
Consumer Discretionary	34.4%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Tesla, Inc.	9.5%
Cloudflare, Inc.	9.4%
DoorDash, Inc.	6.4%
Shopify, Inc.	6.3%
ROBLOX Corp.	5.4%
Trade Desk, Inc.	5.3%
MercadoLibre, Inc.	4.9%
Amazon.com, Inc.	4.9%
Snowflake, Inc.	4.9%
Crowdstrike Holdings, Inc.	3.7%
Total	60.7%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000085091

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Advantage Portfolio

Class Name

Class I

Trading Symbol

MPAIX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Advantage Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$100	0.85%

Expenses Paid, Amount

$ 100

Expense Ratio, Percent

0.85%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the Russell 1000^® Growth Index:

↑ Stock selection in information technology, led by a position in an enterprise analytics platform and Bitcoin developing company

↑ Average overweight and stock selection in consumer discretionary, led by a food delivery company

↑ No exposure to consumer staples, a sector that underperformed in the index

↓ Stock selection in health care, led lower by a biopharmaceutical royalties acquirer and a next-generation sequencing company (the sequencing company was sold during the period)

↓ Stock selection and average overweight in financials,

↓ Average underweight in information technology, which was one of the stronger performing sectors in the period

Line Graph [Table Text Block]

	Class I	S&P 500^® Index	Russell 1000^® Growth Index
12/14	$1,000,000	$1,000,000	$1,000,000
1/15	$1,011,289	$969,981	$984,687
2/15	$1,087,344	$1,025,727	$1,050,322
3/15	$1,078,431	$1,009,506	$1,038,376
4/15	$1,074,272	$1,019,190	$1,043,577
5/15	$1,073,084	$1,032,296	$1,058,266
6/15	$1,062,983	$1,012,313	$1,039,623
7/15	$1,136,478	$1,033,522	$1,074,878
8/15	$1,062,751	$971,166	$1,009,602
9/15	$1,038,775	$947,136	$984,626
10/15	$1,125,689	$1,027,030	$1,069,408
11/15	$1,132,282	$1,030,085	$1,072,410
12/15	$1,125,630	$1,013,838	$1,056,673
1/16	$1,055,803	$963,527	$997,681
2/16	$1,031,235	$962,227	$997,256
3/16	$1,090,717	$1,027,503	$1,064,512
4/16	$1,099,122	$1,031,487	$1,054,791
5/16	$1,113,992	$1,050,010	$1,075,275
6/16	$1,124,337	$1,052,731	$1,071,051
7/16	$1,178,662	$1,091,544	$1,121,607
8/16	$1,185,235	$1,093,076	$1,116,035
9/16	$1,193,124	$1,093,283	$1,120,117
10/16	$1,172,088	$1,073,340	$1,093,813
11/16	$1,172,088	$1,113,091	$1,117,613
12/16	$1,157,327	$1,135,093	$1,131,448
1/17	$1,210,987	$1,156,621	$1,169,576
2/17	$1,246,098	$1,202,546	$1,218,155
3/17	$1,266,634	$1,203,949	$1,232,245
4/17	$1,318,307	$1,216,313	$1,260,426
5/17	$1,363,354	$1,233,430	$1,293,201
6/17	$1,346,793	$1,241,129	$1,289,794
7/17	$1,383,960	$1,266,650	$1,324,076
8/17	$1,397,946	$1,270,527	$1,348,348
9/17	$1,397,280	$1,296,736	$1,365,879
10/17	$1,459,884	$1,326,995	$1,418,803
11/17	$1,506,505	$1,367,694	$1,461,906
12/17	$1,528,373	$1,382,901	$1,473,287
1/18	$1,650,215	$1,462,078	$1,577,634
2/18	$1,638,102	$1,408,190	$1,536,267
3/18	$1,600,338	$1,372,403	$1,494,138
4/18	$1,619,577	$1,377,669	$1,499,358
5/18	$1,695,817	$1,410,846	$1,565,077
6/18	$1,720,756	$1,419,530	$1,580,146
7/18	$1,720,947	$1,472,355	$1,626,533
8/18	$1,814,343	$1,520,333	$1,715,466
9/18	$1,821,583	$1,528,986	$1,725,054
10/18	$1,670,267	$1,424,480	$1,570,788
11/18	$1,705,724	$1,453,508	$1,587,472
12/18	$1,585,560	$1,322,270	$1,450,985
1/19	$1,749,557	$1,428,231	$1,581,409
2/19	$1,816,063	$1,474,089	$1,637,991
3/19	$1,871,233	$1,502,733	$1,684,613
4/19	$1,963,434	$1,563,578	$1,760,724
5/19	$1,903,730	$1,464,216	$1,649,493
6/19	$2,007,268	$1,567,408	$1,762,775
7/19	$2,034,475	$1,589,935	$1,802,580
8/19	$1,991,397	$1,564,750	$1,788,774
9/19	$1,950,587	$1,594,027	$1,788,996
10/19	$1,920,357	$1,628,553	$1,839,431
11/19	$2,011,046	$1,687,668	$1,921,034
12/19	$2,007,316	$1,738,605	$1,978,994
1/20	$2,122,086	$1,737,924	$2,023,234
2/20	$2,010,397	$1,594,859	$1,885,449
3/20	$1,813,979	$1,397,874	$1,699,966
4/20	$2,136,721	$1,577,072	$1,951,512
5/20	$2,450,220	$1,652,185	$2,082,526
6/20	$2,654,340	$1,685,042	$2,173,209
7/20	$2,890,042	$1,780,054	$2,340,414
8/20	$3,122,663	$1,908,005	$2,581,926
9/20	$3,020,987	$1,835,507	$2,460,447
10/20	$2,960,136	$1,786,694	$2,376,885
11/20	$3,367,608	$1,982,273	$2,620,259
12/20	$3,508,593	$2,058,487	$2,740,768
1/21	$3,440,480	$2,037,705	$2,720,489
2/21	$3,635,087	$2,093,895	$2,719,859
3/21	$3,414,533	$2,185,598	$2,766,587
4/21	$3,589,679	$2,302,241	$2,954,822
5/21	$3,505,349	$2,318,321	$2,913,953
6/21	$3,806,989	$2,372,442	$3,096,768
7/21	$3,802,124	$2,428,799	$3,198,826
8/21	$3,858,884	$2,502,648	$3,318,426
9/21	$3,604,274	$2,386,250	$3,132,575
10/21	$3,788,339	$2,553,435	$3,403,905
11/21	$3,617,248	$2,535,743	$3,424,717
12/21	$3,352,619	$2,649,385	$3,497,125
1/22	$2,740,419	$2,512,287	$3,196,984
2/22	$2,629,564	$2,437,066	$3,061,197
3/22	$2,514,714	$2,527,553	$3,180,943
4/22	$2,025,354	$2,307,145	$2,796,807
5/22	$1,717,755	$2,311,378	$2,731,788
6/22	$1,559,962	$2,120,588	$2,515,400
7/22	$1,773,682	$2,316,116	$2,817,301
8/22	$1,803,643	$2,221,660	$2,686,059
9/22	$1,616,887	$2,017,049	$2,424,932
10/22	$1,697,782	$2,180,352	$2,566,666
11/22	$1,685,797	$2,302,198	$2,683,621
12/22	$1,524,097	$2,169,558	$2,478,172
1/23	$1,763,418	$2,305,880	$2,684,721
2/23	$1,716,813	$2,249,619	$2,652,836
3/23	$1,817,580	$2,332,212	$2,834,174
4/23	$1,725,631	$2,368,614	$2,862,136
5/23	$1,905,751	$2,378,910	$2,992,588
6/23	$2,056,901	$2,536,097	$3,197,237
7/23	$2,192,936	$2,617,569	$3,304,952
8/23	$1,949,837	$2,575,893	$3,275,277
9/23	$1,833,955	$2,453,080	$3,097,155
10/23	$1,704,218	$2,401,500	$3,053,059
11/23	$2,043,046	$2,620,818	$3,385,876
12/23	$2,229,464	$2,739,884	$3,535,809
1/24	$2,185,379	$2,785,926	$3,623,998
2/24	$2,444,853	$2,934,682	$3,871,252
3/24	$2,467,526	$3,029,104	$3,939,403
4/24	$2,231,983	$2,905,381	$3,772,310
5/24	$2,179,081	$3,049,444	$3,998,140
6/24	$2,259,694	$3,158,864	$4,267,741
7/24	$2,281,107	$3,197,315	$4,195,145
8/24	$2,371,797	$3,274,872	$4,282,521
9/24	$2,497,756	$3,344,813	$4,403,847
10/24	$2,604,820	$3,314,481	$4,389,274
11/24	$3,111,173	$3,509,044	$4,673,964
12/24	$3,035,631	$3,425,395	$4,715,222

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class I	36.16%	8.62%	11.74%
S&P 500^® Index	25.02%	14.53%	13.10%
Russell 1000^® Growth Index	33.36%	18.96%	16.78%

AssetsNet

$ 194,996,435

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 877,326

InvestmentCompanyPortfolioTurnover

57.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$194,996,435
# of Portfolio Holdings	28
Portfolio Turnover Rate	57%
Total Advisory Fees Paid	$877,326

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Real Estate	1.6%
Short-Term Investments	2.3%
Industrials	2.6%
Investment Company	3.0%
Health Care	5.8%
Financals	8.0%
Communication Services	10.7%
Information Technology	31.6%
Consumer Discretionary	34.4%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Tesla, Inc.	9.5%
Cloudflare, Inc.	9.4%
DoorDash, Inc.	6.4%
Shopify, Inc.	6.3%
ROBLOX Corp.	5.4%
Trade Desk, Inc.	5.3%
MercadoLibre, Inc.	4.9%
Amazon.com, Inc.	4.9%
Snowflake, Inc.	4.9%
Crowdstrike Holdings, Inc.	3.7%
Total	60.7%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000085092

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Advantage Portfolio

Class Name

Class L

Trading Symbol

MAPLX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Advantage Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$117	0.99%

Expenses Paid, Amount

$ 117

Expense Ratio, Percent

0.99%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the Russell 1000^® Growth Index:

↑ Stock selection in information technology, led by a position in an enterprise analytics platform and Bitcoin developing company

↑ Average overweight and stock selection in consumer discretionary, led by a food delivery company

↑ No exposure to consumer staples, a sector that underperformed in the index

↓ Stock selection in health care, led lower by a biopharmaceutical royalties acquirer and a next-generation sequencing company (the sequencing company was sold during the period)

↓ Stock selection and average overweight in financials,

↓ Average underweight in information technology, which was one of the stronger performing sectors in the period

Line Graph [Table Text Block]

	Class L	S&P 500^® Index	Russell 1000^® Growth Index
12/14	$10,000	$10,000	$10,000
1/15	$10,113	$9,700	$9,847
2/15	$10,874	$10,257	$10,503
3/15	$10,785	$10,095	$10,384
4/15	$10,749	$10,192	$10,436
5/15	$10,731	$10,323	$10,583
6/15	$10,630	$10,123	$10,396
7/15	$11,361	$10,335	$10,749
8/15	$10,624	$9,712	$10,096
9/15	$10,384	$9,471	$9,846
10/15	$11,253	$10,270	$10,694
11/15	$11,313	$10,301	$10,724
12/15	$11,247	$10,138	$10,567
1/16	$10,549	$9,635	$9,977
2/16	$10,303	$9,622	$9,973
3/16	$10,898	$10,275	$10,645
4/16	$10,982	$10,315	$10,548
5/16	$11,124	$10,500	$10,753
6/16	$11,227	$10,527	$10,711
7/16	$11,770	$10,915	$11,216
8/16	$11,836	$10,931	$11,160
9/16	$11,915	$10,933	$11,201
10/16	$11,705	$10,733	$10,938
11/16	$11,705	$11,131	$11,176
12/16	$11,552	$11,351	$11,314
1/17	$12,088	$11,566	$11,696
2/17	$12,439	$12,025	$12,182
3/17	$12,651	$12,039	$12,322
4/17	$13,160	$12,163	$12,604
5/17	$13,610	$12,334	$12,932
6/17	$13,438	$12,411	$12,898
7/17	$13,816	$12,666	$13,241
8/17	$13,949	$12,705	$13,483
9/17	$13,942	$12,967	$13,659
10/17	$14,568	$13,270	$14,188
11/17	$15,027	$13,677	$14,619
12/17	$15,245	$13,829	$14,733
1/18	$16,455	$14,621	$15,776
2/18	$16,341	$14,082	$15,363
3/18	$15,964	$13,724	$14,941
4/18	$16,149	$13,777	$14,994
5/18	$16,910	$14,108	$15,651
6/18	$17,152	$14,195	$15,801
7/18	$17,154	$14,724	$16,265
8/18	$18,087	$15,203	$17,155
9/18	$18,152	$15,290	$17,251
10/18	$16,648	$14,245	$15,708
11/18	$16,988	$14,535	$15,875
12/18	$15,795	$13,223	$14,510
1/19	$17,425	$14,282	$15,814
2/19	$18,090	$14,741	$16,380
3/19	$18,633	$15,027	$16,846
4/19	$19,547	$15,636	$17,607
5/19	$18,951	$14,642	$16,495
6/19	$19,985	$15,674	$17,628
7/19	$20,249	$15,899	$18,026
8/19	$19,819	$15,648	$17,888
9/19	$19,419	$15,940	$17,890
10/19	$19,109	$16,286	$18,394
11/19	$20,008	$16,877	$19,210
12/19	$19,970	$17,386	$19,790
1/20	$21,117	$17,379	$20,232
2/20	$19,993	$15,949	$18,854
3/20	$18,039	$13,979	$17,000
4/20	$21,248	$15,771	$19,515
5/20	$24,364	$16,522	$20,825
6/20	$26,396	$16,850	$21,732
7/20	$28,735	$17,801	$23,404
8/20	$31,044	$19,080	$25,819
9/20	$30,036	$18,355	$24,604
10/20	$29,428	$17,867	$23,769
11/20	$33,476	$19,823	$26,203
12/20	$34,877	$20,585	$27,408
1/21	$34,196	$20,377	$27,205
2/21	$36,125	$20,939	$27,199
3/21	$33,929	$21,856	$27,666
4/21	$35,671	$23,022	$29,548
5/21	$34,836	$23,183	$29,140
6/21	$37,827	$23,724	$30,968
7/21	$37,770	$24,288	$31,988
8/21	$38,329	$25,026	$33,184
9/21	$35,801	$23,863	$31,326
10/21	$37,624	$25,534	$34,039
11/21	$35,922	$25,357	$34,247
12/21	$33,294	$26,494	$34,971
1/22	$27,207	$25,123	$31,970
2/22	$26,107	$24,371	$30,612
3/22	$24,958	$25,276	$31,809
4/22	$20,100	$23,071	$27,968
5/22	$17,042	$23,114	$27,318
6/22	$15,473	$21,206	$25,154
7/22	$17,592	$23,161	$28,173
8/22	$17,891	$22,217	$26,861
9/22	$16,042	$20,170	$24,249
10/22	$16,842	$21,804	$25,667
11/22	$16,722	$23,022	$26,836
12/22	$15,113	$21,696	$24,782
1/23	$17,489	$23,059	$26,847
2/23	$17,021	$22,496	$26,528
3/23	$18,020	$23,322	$28,342
4/23	$17,097	$23,686	$28,621
5/23	$18,879	$23,789	$29,926
6/23	$20,383	$25,361	$31,972
7/23	$21,735	$26,176	$33,050
8/23	$19,321	$25,759	$32,753
9/23	$18,171	$24,531	$30,972
10/23	$16,870	$24,015	$30,531
11/23	$20,231	$26,208	$33,859
12/23	$22,076	$27,399	$35,358
1/24	$21,634	$27,859	$36,240
2/24	$24,199	$29,347	$38,713
3/24	$24,414	$30,291	$39,394
4/24	$22,088	$29,054	$37,723
5/24	$21,570	$30,494	$39,981
6/24	$22,354	$31,589	$42,677
7/24	$22,569	$31,973	$41,951
8/24	$23,466	$32,749	$42,825
9/24	$24,704	$33,448	$44,038
10/24	$25,766	$33,145	$43,893
11/24	$30,770	$35,090	$46,740
12/24	$30,016	$34,254	$47,152

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class L	35.97%	8.49%	11.62%
S&P 500^® Index	25.02%	14.53%	13.10%
Russell 1000^® Growth Index	33.36%	18.96%	16.78%

AssetsNet

$ 194,996,435

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 877,326

InvestmentCompanyPortfolioTurnover

57.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$194,996,435
# of Portfolio Holdings	28
Portfolio Turnover Rate	57%
Total Advisory Fees Paid	$877,326

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Real Estate	1.6%
Short-Term Investments	2.3%
Industrials	2.6%
Investment Company	3.0%
Health Care	5.8%
Financals	8.0%
Communication Services	10.7%
Information Technology	31.6%
Consumer Discretionary	34.4%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Tesla, Inc.	9.5%
Cloudflare, Inc.	9.4%
DoorDash, Inc.	6.4%
Shopify, Inc.	6.3%
ROBLOX Corp.	5.4%
Trade Desk, Inc.	5.3%
MercadoLibre, Inc.	4.9%
Amazon.com, Inc.	4.9%
Snowflake, Inc.	4.9%
Crowdstrike Holdings, Inc.	3.7%
Total	60.7%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000126919

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Advantage Portfolio

Class Name

Class R6

Trading Symbol

MADSX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Advantage Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$96	0.81%

Expenses Paid, Amount

$ 96

Expense Ratio, Percent

0.81%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the Russell 1000^® Growth Index:

↑ Stock selection in information technology, led by a position in an enterprise analytics platform and Bitcoin developing company

↑ Average overweight and stock selection in consumer discretionary, led by a food delivery company

↑ No exposure to consumer staples, a sector that underperformed in the index

↓ Stock selection in health care, led lower by a biopharmaceutical royalties acquirer and a next-generation sequencing company (the sequencing company was sold during the period)

↓ Stock selection and average overweight in financials,

↓ Average underweight in information technology, which was one of the stronger performing sectors in the period

Line Graph [Table Text Block]

	Class R6	S&P 500^® Index	Russell 1000^® Growth Index
12/14	$5,000,000	$5,000,000	$5,000,000
1/15	$5,056,413	$4,849,904	$4,923,436
2/15	$5,436,461	$5,128,635	$5,251,609
3/15	$5,394,893	$5,047,528	$5,191,882
4/15	$5,374,109	$5,095,950	$5,217,884
5/15	$5,365,202	$5,161,481	$5,291,331
6/15	$5,314,727	$5,061,564	$5,198,115
7/15	$5,683,327	$5,167,610	$5,374,388
8/15	$5,314,825	$4,855,829	$5,048,008
9/15	$5,194,986	$4,735,678	$4,923,131
10/15	$5,629,400	$5,135,152	$5,347,041
11/15	$5,662,355	$5,150,423	$5,362,050
12/15	$5,632,340	$5,069,192	$5,283,363
1/16	$5,280,117	$4,817,637	$4,988,406
2/16	$5,157,323	$4,811,137	$4,986,278
3/16	$5,457,844	$5,137,516	$5,322,559
4/16	$5,499,852	$5,157,433	$5,273,956
5/16	$5,570,943	$5,250,051	$5,376,373
6/16	$5,622,645	$5,263,654	$5,355,257
7/16	$5,897,386	$5,457,718	$5,608,036
8/16	$5,930,241	$5,465,381	$5,580,173
9/16	$5,972,952	$5,466,414	$5,600,586
10/16	$5,864,532	$5,366,700	$5,469,067
11/16	$5,864,532	$5,565,456	$5,588,064
12/16	$5,789,373	$5,675,463	$5,657,239
1/17	$6,057,645	$5,783,106	$5,847,880
2/17	$6,236,493	$6,012,730	$6,090,776
3/17	$6,339,164	$6,019,744	$6,161,224
4/17	$6,597,500	$6,081,566	$6,302,132
5/17	$6,822,716	$6,167,151	$6,466,004
6/17	$6,739,916	$6,205,643	$6,448,969
7/17	$6,929,062	$6,333,248	$6,620,378
8/17	$6,995,656	$6,352,635	$6,741,738
9/17	$6,992,326	$6,483,678	$6,829,394
10/17	$7,308,645	$6,634,977	$7,094,014
11/17	$7,541,723	$6,838,471	$7,309,528
12/17	$7,654,609	$6,914,505	$7,366,434
1/18	$8,260,139	$7,310,388	$7,888,170
2/18	$8,203,148	$7,040,948	$7,681,336
3/18	$8,014,365	$6,862,015	$7,470,689
4/18	$8,110,538	$6,888,345	$7,496,789
5/18	$8,491,665	$7,054,230	$7,825,383
6/18	$8,616,333	$7,097,648	$7,900,730
7/18	$8,617,288	$7,361,777	$8,132,667
8/18	$9,087,782	$7,601,663	$8,577,332
9/18	$9,123,974	$7,644,931	$8,625,271
10/18	$8,367,564	$7,122,399	$7,853,939
11/18	$8,541,167	$7,267,542	$7,937,361
12/18	$7,940,527	$6,611,349	$7,254,926
1/19	$8,764,045	$7,141,155	$7,907,044
2/19	$9,096,475	$7,370,445	$8,189,956
3/19	$9,372,240	$7,513,666	$8,423,067
4/19	$9,836,885	$7,817,891	$8,803,620
5/19	$9,538,454	$7,321,079	$8,247,465
6/19	$10,055,986	$7,837,041	$8,813,874
7/19	$10,191,980	$7,949,676	$9,012,899
8/19	$9,976,657	$7,823,750	$8,943,871
9/19	$9,772,666	$7,970,136	$8,944,981
10/19	$9,621,562	$8,142,767	$9,197,155
11/19	$10,074,874	$8,438,340	$9,605,169
12/19	$10,056,145	$8,693,027	$9,894,968
1/20	$10,633,642	$8,689,618	$10,116,172
2/20	$10,071,545	$7,974,296	$9,427,243
3/20	$9,089,801	$6,989,368	$8,499,832
4/20	$10,706,792	$7,885,361	$9,757,562
5/20	$12,277,583	$8,260,926	$10,412,628
6/20	$13,305,528	$8,425,212	$10,866,046
7/20	$14,483,621	$8,900,269	$11,702,070
8/20	$15,650,165	$9,540,025	$12,909,631
9/20	$15,141,968	$9,177,536	$12,302,234
10/20	$14,837,819	$8,933,470	$11,884,427
11/20	$16,882,158	$9,911,364	$13,101,295
12/20	$17,590,829	$10,292,437	$13,703,838
1/21	$17,250,439	$10,188,527	$13,602,446
2/21	$18,227,032	$10,469,475	$13,599,297
3/21	$17,120,767	$10,927,992	$13,832,936
4/21	$18,004,158	$11,511,206	$14,774,110
5/21	$17,582,724	$11,591,604	$14,569,765
6/21	$19,094,214	$11,862,208	$15,483,840
7/21	$19,069,901	$12,143,994	$15,994,130
8/21	$19,357,611	$12,513,240	$16,592,132
9/21	$18,081,151	$11,931,252	$15,662,877
10/21	$19,005,065	$12,767,177	$17,019,525
11/21	$18,145,987	$12,678,714	$17,123,583
12/21	$16,824,456	$13,246,924	$17,485,624
1/22	$13,747,785	$12,561,435	$15,984,919
2/22	$13,194,283	$12,185,328	$15,305,983
3/22	$12,615,849	$12,637,763	$15,904,717
4/22	$10,162,490	$11,535,727	$13,984,036
5/22	$8,616,675	$11,556,891	$13,658,941
6/22	$7,828,807	$10,602,942	$12,576,998
7/22	$8,900,905	$11,580,580	$14,086,503
8/22	$9,050,500	$11,108,302	$13,430,297
9/22	$8,118,025	$10,085,243	$12,124,661
10/22	$8,521,931	$10,901,758	$12,833,328
11/22	$8,462,093	$11,510,992	$13,418,104
12/22	$7,649,346	$10,847,792	$12,390,859
1/23	$8,855,155	$11,529,401	$13,423,605
2/23	$8,616,505	$11,248,096	$13,264,182
3/23	$9,125,205	$11,661,061	$14,170,870
4/23	$8,660,467	$11,843,072	$14,310,682
5/23	$9,571,103	$11,894,550	$14,962,939
6/23	$10,324,733	$12,680,485	$15,986,187
7/23	$11,009,281	$13,087,846	$16,524,758
8/23	$9,790,912	$12,879,467	$16,376,384
9/23	$9,213,129	$12,265,401	$15,485,773
10/23	$8,553,702	$12,007,502	$15,265,294
11/23	$10,261,931	$13,104,092	$16,929,379
12/23	$11,191,408	$13,699,419	$17,679,045
1/24	$10,971,599	$13,929,628	$18,119,989
2/24	$12,277,892	$14,673,408	$19,356,262
3/24	$12,390,936	$15,145,519	$19,697,014
4/24	$11,210,249	$14,526,907	$18,861,550
5/24	$10,946,478	$15,247,219	$19,990,700
6/24	$11,348,414	$15,794,322	$21,338,705
7/24	$11,455,179	$15,986,576	$20,975,724
8/24	$11,913,637	$16,374,358	$21,412,605
9/24	$12,541,662	$16,724,067	$22,019,235
10/24	$13,081,764	$16,572,403	$21,946,368
11/24	$15,625,266	$17,545,222	$23,369,819
12/24	$15,241,306	$17,126,975	$23,576,108

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class R6	36.19%	8.67%	11.79%
S&P 500^® Index	25.02%	14.53%	13.10%
Russell 1000^® Growth Index	33.36%	18.96%	16.78%

AssetsNet

$ 194,996,435

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 877,326

InvestmentCompanyPortfolioTurnover

57.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$194,996,435
# of Portfolio Holdings	28
Portfolio Turnover Rate	57%
Total Advisory Fees Paid	$877,326

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Real Estate	1.6%
Short-Term Investments	2.3%
Industrials	2.6%
Investment Company	3.0%
Health Care	5.8%
Financals	8.0%
Communication Services	10.7%
Information Technology	31.6%
Consumer Discretionary	34.4%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Tesla, Inc.	9.5%
Cloudflare, Inc.	9.4%
DoorDash, Inc.	6.4%
Shopify, Inc.	6.3%
ROBLOX Corp.	5.4%
Trade Desk, Inc.	5.3%
MercadoLibre, Inc.	4.9%
Amazon.com, Inc.	4.9%
Snowflake, Inc.	4.9%
Crowdstrike Holdings, Inc.	3.7%
Total	60.7%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000236926

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - American Resilience Portfolio

Class Name

Class A

Trading Symbol

MSCUX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - American Resilience Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$110	1.05%

Expenses Paid, Amount

$ 110

Expense Ratio, Percent

1.05%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the S&P 500^® Index:

↓ Stock selection in information technology (IT), financials and health care was the primary detractor

↓ The portfolio’s tilt toward software and IT services significantly lagged semiconductors and hardware. The relative performance impact of the “Magnificent Seven” was notable: the Portfolio owned Microsoft and Alphabet, but the Fund’s high quality bar and strict valuation discipline precluded it from owning the other five, which detracted significantly.

↓ Stock selection in financials lagged due to the strength of banks’ performance in the Index

↓ Consumer staples weakness was primarily down to Constellation Brands, which suffered due to Mexican tariff fears

↑ Financials sector overweight, consumer discretionary sector underweight

↑ Not owning low quality, cyclical sectors, specifically materials, energy and real estate

Line Graph [Table Text Block]

	Class A with maximum sales charge	S&P 500^® Index
7/22	$9,479	$10,000
8/22	$8,995	$9,592
9/22	$8,085	$8,709
10/22	$8,540	$9,414
11/22	$9,175	$9,940
12/22	$8,825	$9,367
1/23	$9,289	$9,956
2/23	$8,844	$9,713
3/23	$9,308	$10,069
4/23	$9,431	$10,227
5/23	$9,289	$10,271
6/23	$9,924	$10,950
7/23	$10,161	$11,302
8/23	$10,152	$11,122
9/23	$9,640	$10,591
10/23	$9,308	$10,369
11/23	$10,114	$11,316
12/23	$10,519	$11,830
1/24	$10,643	$12,028
2/24	$11,035	$12,671
3/24	$11,112	$13,078
4/24	$10,557	$12,544
5/24	$10,825	$13,166
6/24	$10,988	$13,639
7/24	$11,476	$13,805
8/24	$11,811	$14,139
9/24	$11,926	$14,441
10/24	$11,610	$14,311
11/24	$12,040	$15,151
12/24	$11,593	$14,789

Average Annual Return [Table Text Block]

AATR	1 Year	Since 7/29/22 (Inception)
Class A	10.21%	8.66%
Class A, with 5.25% maximum front end sales charge	4.41%	6.28%
S&P 500^® Index	25.02%	17.52%

Performance Inception Date

Jul. 29, 2022

AssetsNet

$ 1,369,354

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 0

InvestmentCompanyPortfolioTurnover

43.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$1,369,354
# of Portfolio Holdings	36
Portfolio Turnover Rate	43%
Total Advisory Fees Paid (Net of Waivers)	$0

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.5%
Communication Services	5.2%
Consumer Discretionary	5.5%
Industrials	10.7%
Consumer Staples	10.8%
Health Care	21.0%
Information Technology	22.3%
Financials	23.0%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Microsoft Corp.	7.2%
Visa, Inc.	6.5%
Alphabet, Inc.	5.2%
Accenture PLC	4.6%
Aon PLC	4.1%
Texas Instruments, Inc.	3.9%
Procter & Gamble Co.	3.9%
Intercontinental Exchange, Inc.	3.5%
Thermo Fisher Scientific, Inc.	3.3%
Automatic Data Processing, Inc.	3.2%
Total	45.4%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000236923

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - American Resilience Portfolio

Class Name

Class C

Trading Symbol

MSBWX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - American Resilience Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$188	1.80%

Expenses Paid, Amount

$ 188

Expense Ratio, Percent

1.80%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the S&P 500^® Index:

↓ Stock selection in information technology (IT), financials and health care was the primary detractor

↓ Stock selection in financials lagged due to the strength of banks’ performance in the Index

↓ Consumer staples weakness was primarily down to Constellation Brands, which suffered due to Mexican tariff fears

↑ Financials sector overweight, consumer discretionary sector underweight

↑ Not owning low quality, cyclical sectors, specifically materials, energy and real estate

Line Graph [Table Text Block]

	Class C	S&P 500^® Index
7/22	$10,000	$10,000
8/22	$9,480	$9,592
9/22	$8,520	$8,709
10/22	$9,000	$9,414
11/22	$9,650	$9,940
12/22	$9,290	$9,367
1/23	$9,760	$9,956
2/23	$9,290	$9,713
3/23	$9,770	$10,069
4/23	$9,890	$10,227
5/23	$9,740	$10,271
6/23	$10,400	$10,950
7/23	$10,640	$11,302
8/23	$10,630	$11,122
9/23	$10,080	$10,591
10/23	$9,730	$10,369
11/23	$10,560	$11,316
12/23	$10,981	$11,830
1/24	$11,102	$12,028
2/24	$11,503	$12,671
3/24	$11,573	$13,078
4/24	$10,991	$12,544
5/24	$11,262	$13,166
6/24	$11,423	$13,639
7/24	$11,934	$13,805
8/24	$12,265	$14,139
9/24	$12,385	$14,441
10/24	$12,044	$14,311
11/24	$12,486	$15,151
12/24	$12,003	$14,789

Average Annual Return [Table Text Block]

AATR	1 Year	Since 7/29/22 (Inception)
Class C	9.31%	7.82%
Class C, with 1% maximum contingent deferred sales charge	8.31%	7.82%
S&P 500^® Index	25.02%	17.52%

Performance Inception Date

Jul. 29, 2022

AssetsNet

$ 1,369,354

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 0

InvestmentCompanyPortfolioTurnover

43.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$1,369,354
# of Portfolio Holdings	36
Portfolio Turnover Rate	43%
Total Advisory Fees Paid (Net of Waivers)	$0

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.5%
Communication Services	5.2%
Consumer Discretionary	5.5%
Industrials	10.7%
Consumer Staples	10.8%
Health Care	21.0%
Information Technology	22.3%
Financials	23.0%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Microsoft Corp.	7.2%
Visa, Inc.	6.5%
Alphabet, Inc.	5.2%
Accenture PLC	4.6%
Aon PLC	4.1%
Texas Instruments, Inc.	3.9%
Procter & Gamble Co.	3.9%
Intercontinental Exchange, Inc.	3.5%
Thermo Fisher Scientific, Inc.	3.3%
Automatic Data Processing, Inc.	3.2%
Total	45.4%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000236924

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - American Resilience Portfolio

Class Name

Class I

Trading Symbol

MSBVX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - American Resilience Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$74	0.70%

Expenses Paid, Amount

$ 74

Expense Ratio, Percent

0.70%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the S&P 500^® Index:

↓ Stock selection in information technology (IT), financials and health care was the primary detractor

↓ Stock selection in financials lagged due to the strength of banks’ performance in the Index

↓ Consumer staples weakness was primarily down to Constellation Brands, which suffered due to Mexican tariff fears

↑ Financials sector overweight, consumer discretionary sector underweight

↑ Not owning low quality, cyclical sectors, specifically materials, energy and real estate

Line Graph [Table Text Block]

	Class I	S&P 500^® Index
7/22	$1,000,000	$1,000,000
8/22	$949,000	$1,000,000
9/22	$854,000	$870,875
10/22	$902,000	$941,383
11/22	$969,000	$993,991
12/22	$933,000	$936,723
1/23	$982,000	$995,581
2/23	$935,000	$971,289
3/23	$984,000	$1,006,950
4/23	$997,000	$1,022,667
5/23	$983,000	$1,027,112
6/23	$1,050,000	$1,094,978
7/23	$1,076,000	$1,130,155
8/23	$1,076,000	$1,112,161
9/23	$1,021,000	$1,059,135
10/23	$986,000	$1,036,865
11/23	$1,072,000	$1,131,557
12/23	$1,115,319	$1,182,965
1/24	$1,128,488	$1,202,844
2/24	$1,170,021	$1,267,070
3/24	$1,179,138	$1,307,838
4/24	$1,120,384	$1,254,420
5/24	$1,149,761	$1,316,620
6/24	$1,166,982	$1,363,863
7/24	$1,219,658	$1,380,464
8/24	$1,255,114	$1,413,950
9/24	$1,268,283	$1,444,148
10/24	$1,234,854	$1,431,051
11/24	$1,281,452	$1,515,056
12/24	$1,233,096	$1,478,939

Average Annual Return [Table Text Block]

AATR	1 Year	Since 7/29/22 (Inception)
Class I	10.56%	9.03%
S&P 500^® Index	25.02%	17.52%

Performance Inception Date

Jul. 29, 2022

AssetsNet

$ 1,369,354

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 0

InvestmentCompanyPortfolioTurnover

43.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$1,369,354
# of Portfolio Holdings	36
Portfolio Turnover Rate	43%
Total Advisory Fees Paid (Net of Waivers)	$0

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.5%
Communication Services	5.2%
Consumer Discretionary	5.5%
Industrials	10.7%
Consumer Staples	10.8%
Health Care	21.0%
Information Technology	22.3%
Financials	23.0%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Microsoft Corp.	7.2%
Visa, Inc.	6.5%
Alphabet, Inc.	5.2%
Accenture PLC	4.6%
Aon PLC	4.1%
Texas Instruments, Inc.	3.9%
Procter & Gamble Co.	3.9%
Intercontinental Exchange, Inc.	3.5%
Thermo Fisher Scientific, Inc.	3.3%
Automatic Data Processing, Inc.	3.2%
Total	45.4%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000236925

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - American Resilience Portfolio

Class Name

Class R6

Trading Symbol

MSBQX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - American Resilience Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$68	0.65%

Expenses Paid, Amount

$ 68

Expense Ratio, Percent

0.65%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the S&P 500^® Index:

↓ Stock selection in information technology (IT), financials and health care was the primary detractor

↓ Stock selection in financials lagged due to the strength of banks’ performance in the Index

↓ Consumer staples weakness was primarily down to Constellation Brands, which suffered due to Mexican tariff fears

↑ Financials sector overweight, consumer discretionary sector underweight

↑ Not owning low quality, cyclical sectors, specifically materials, energy and real estate

Line Graph [Table Text Block]

	Class R6	S&P 500^® Index
7/22	$5,000,000	$5,000,000
8/22	$4,745,000	$5,000,000
9/22	$4,270,000	$4,354,377
10/22	$4,510,000	$4,706,914
11/22	$4,845,000	$4,969,955
12/22	$4,665,000	$4,683,613
1/23	$4,910,000	$4,977,903
2/23	$4,675,000	$4,856,447
3/23	$4,920,000	$5,034,748
4/23	$4,990,000	$5,113,333
5/23	$4,915,000	$5,135,559
6/23	$5,255,000	$5,474,892
7/23	$5,385,000	$5,650,773
8/23	$5,380,000	$5,560,804
9/23	$5,105,000	$5,295,676
10/23	$4,935,000	$5,184,327
11/23	$5,365,000	$5,657,787
12/23	$5,579,184	$5,914,824
1/24	$5,645,060	$6,014,218
2/24	$5,857,890	$6,335,351
3/24	$5,898,429	$6,539,189
4/24	$5,609,588	$6,272,098
5/24	$5,751,475	$6,583,098
6/24	$5,837,620	$6,819,314
7/24	$6,106,191	$6,902,321
8/24	$6,283,550	$7,069,749
9/24	$6,349,426	$7,220,738
10/24	$6,182,202	$7,155,256
11/24	$6,410,234	$7,575,278
12/24	$6,171,110	$7,394,697

Average Annual Return [Table Text Block]

AATR	1 Year	Since 7/29/22 (Inception)
Class R6	10.61%	9.07%
S&P 500^® Index	25.02%	17.52%

Performance Inception Date

Jul. 29, 2022

AssetsNet

$ 1,369,354

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 0

InvestmentCompanyPortfolioTurnover

43.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$1,369,354
# of Portfolio Holdings	36
Portfolio Turnover Rate	43%
Total Advisory Fees Paid (Net of Waivers)	$0

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.5%
Communication Services	5.2%
Consumer Discretionary	5.5%
Industrials	10.7%
Consumer Staples	10.8%
Health Care	21.0%
Information Technology	22.3%
Financials	23.0%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Microsoft Corp.	7.2%
Visa, Inc.	6.5%
Alphabet, Inc.	5.2%
Accenture PLC	4.6%
Aon PLC	4.1%
Texas Instruments, Inc.	3.9%
Procter & Gamble Co.	3.9%
Intercontinental Exchange, Inc.	3.5%
Thermo Fisher Scientific, Inc.	3.3%
Automatic Data Processing, Inc.	3.2%
Total	45.4%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000163121

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Asia Opportunity Portfolio

Class Name

Class A

Trading Symbol

MSAUX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Asia Opportunity Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$154	1.40%

Expenses Paid, Amount

$ 154

Expense Ratio, Percent

1.40%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country Asia ex Japan Net Index:

↑ Stock selection in consumer discretionary, led by a Chinese online travel agency, which was the largest positive contributor in the portfolio

↑ Stock selection in industrials, led by a holding in an operator of a Southeast Asian super app (an integrated app platform combining multiple services)

↑ No exposure to materials

↓ Stock selection in communication services, where a holding in a Korean search engine was the main detractor

↓ An underweight allocation to information technology, where exposure to a power management integrated circuit fabless integrated design manufacturer was the main detractor

↓ Stock selection in financials, where a Korean digital bank was the largest detractor in the portfolio

Line Graph [Table Text Block]

	Class A with maximum sales charge	MSCI All Country Asia ex Japan Net Index
12/15	$9,507	$9,982
1/16	$8,910	$9,219
2/16	$8,512	$9,134
3/16	$9,280	$10,159
4/16	$9,384	$10,068
5/16	$9,365	$9,934
6/16	$9,649	$10,199
7/16	$9,881	$10,694
8/16	$10,099	$11,054
9/16	$10,280	$11,234
10/16	$10,099	$11,064
11/16	$9,739	$10,745
12/16	$9,348	$10,525
1/17	$9,928	$11,177
2/17	$10,334	$11,556
3/17	$11,088	$11,934
4/17	$11,601	$12,193
5/17	$12,297	$12,723
6/17	$12,712	$12,926
7/17	$13,669	$13,617
8/17	$14,220	$13,798
9/17	$14,771	$13,782
10/17	$15,380	$14,432
11/17	$15,245	$14,524
12/17	$16,469	$14,916
1/18	$17,848	$16,044
2/18	$17,163	$15,245
3/18	$17,281	$15,015
4/18	$16,850	$15,121
5/18	$18,229	$14,921
6/18	$17,711	$14,206
7/18	$17,043	$14,325
8/18	$16,178	$14,179
9/18	$15,883	$13,982
10/18	$13,680	$12,466
11/18	$14,614	$13,128
12/18	$14,181	$12,772
1/19	$15,352	$13,706
2/19	$16,502	$13,992
3/19	$17,712	$14,232
4/19	$17,997	$14,503
5/19	$16,670	$13,265
6/19	$18,292	$14,138
7/19	$17,751	$13,889
8/19	$18,322	$13,280
9/19	$18,253	$13,502
10/19	$19,433	$14,116
11/19	$19,482	$14,151
12/19	$20,446	$15,093
1/20	$19,895	$14,421
2/20	$20,249	$14,007
3/20	$18,617	$12,318
4/20	$19,797	$13,422
5/20	$20,780	$13,267
6/20	$22,787	$14,377
7/20	$25,226	$15,599
8/20	$27,684	$16,152
9/20	$26,848	$15,909
10/20	$27,458	$16,354
11/20	$29,150	$17,668
12/20	$31,109	$18,869
1/21	$32,730	$19,639
2/21	$33,684	$19,883
3/21	$31,467	$19,378
4/21	$31,576	$19,859
5/21	$31,696	$20,101
6/21	$31,228	$20,077
7/21	$26,029	$18,572
8/21	$26,387	$18,996
9/21	$25,810	$18,203
10/21	$26,735	$18,450
11/21	$25,094	$17,736
12/21	$24,658	$17,979
1/22	$23,544	$17,421
2/22	$22,702	$17,012
3/22	$20,003	$16,542
4/22	$18,950	$15,687
5/22	$19,010	$15,760
6/22	$19,140	$15,052
7/22	$18,799	$14,870
8/22	$18,829	$14,868
9/22	$17,044	$12,970
10/22	$14,746	$12,179
11/22	$18,759	$14,469
12/22	$19,180	$14,442
1/23	$20,575	$15,628
2/23	$19,221	$14,562
3/23	$19,552	$15,069
4/23	$18,809	$14,756
5/23	$17,565	$14,485
6/23	$18,448	$14,879
7/23	$19,873	$15,790
8/23	$18,649	$14,778
9/23	$17,816	$14,381
10/23	$17,094	$13,825
11/23	$17,485	$14,786
12/23	$17,806	$15,306
1/24	$16,231	$14,471
2/24	$17,375	$15,281
3/24	$18,037	$15,670
4/24	$19,040	$15,865
5/24	$19,331	$16,112
6/24	$18,930	$16,797
7/24	$18,488	$16,775
8/24	$18,869	$17,102
9/24	$21,899	$18,544
10/24	$21,558	$17,692
11/24	$21,849	$17,111
12/24	$21,254	$17,136

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 12/29/15 (Inception)
Class A	19.36%	0.78%	9.38%
Class A, with 5.25% maximum front end sales charge	13.12%	(0.30)%	8.73%
MSCI All Country Asia ex Japan Net Index	11.96%	2.57%	6.16%

Performance Inception Date

Dec. 29, 2015

AssetsNet

$ 125,093,937

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 814,793

InvestmentCompanyPortfolioTurnover

19.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$125,093,937
# of Portfolio Holdings	32
Portfolio Turnover Rate	19%
Total Advisory Fees Paid	$814,793

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
United States	1.3%
Hong Kong	2.4%
Singapore	4.4%
Taiwan	5.1%
Korea, Republic of	12.0%
India	27.0%
China	47.8%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Trip.com Group Ltd.	8.0%
ICICI Bank Ltd.	6.8%
Coupang, Inc.	6.2%
Meituan	6.1%
HDFC Bank Ltd.	5.2%
Taiwan Semiconductor Manufacturing Co. Ltd.	5.1%
Zomato Ltd.	4.8%
Qifu Technology, Inc.	4.6%
Tencent Holdings Ltd.	4.5%
Full Truck Alliance Co. Ltd.	4.5%
Total	55.8%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000163122

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Asia Opportunity Portfolio

Class Name

Class C

Trading Symbol

MSAWX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Asia Opportunity Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$235	2.15%

Expenses Paid, Amount

$ 235

Expense Ratio, Percent

2.15%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country Asia ex Japan Net Index:

↑ Stock selection in consumer discretionary, led by a Chinese online travel agency, which was the largest positive contributor in the portfolio

↑ Stock selection in industrials, led by a holding in an operator of a Southeast Asian super app (an integrated app platform combining multiple services)

↑ No exposure to materials

↓ Stock selection in communication services, where a holding in a Korean search engine was the main detractor

↓ An underweight allocation to information technology, where exposure to a power management integrated circuit fabless integrated design manufacturer was the main detractor

↓ Stock selection in financials, where a Korean digital bank was the largest detractor in the portfolio

Line Graph [Table Text Block]

	Class C	MSCI All Country Asia ex Japan Net Index
12/15	$10,030	$9,982
1/16	$9,390	$9,219
2/16	$8,970	$9,134
3/16	$9,770	$10,159
4/16	$9,870	$10,068
5/16	$9,840	$9,934
6/16	$10,140	$10,199
7/16	$10,384	$10,694
8/16	$10,594	$11,054
9/16	$10,774	$11,234
10/16	$10,584	$11,064
11/16	$10,204	$10,745
12/16	$9,785	$10,525
1/17	$10,391	$11,177
2/17	$10,806	$11,556
3/17	$11,594	$11,934
4/17	$12,110	$12,193
5/17	$12,827	$12,723
6/17	$13,252	$12,926
7/17	$14,243	$13,617
8/17	$14,809	$13,798
9/17	$15,375	$13,782
10/17	$16,001	$14,432
11/17	$15,850	$14,524
12/17	$17,109	$14,916
1/18	$18,531	$16,044
2/18	$17,815	$15,245
3/18	$17,917	$15,015
4/18	$17,457	$15,121
5/18	$18,868	$14,921
6/18	$18,326	$14,206
7/18	$17,618	$14,325
8/18	$16,713	$14,179
9/18	$16,404	$13,982
10/18	$14,121	$12,466
11/18	$15,077	$13,128
12/18	$14,615	$12,772
1/19	$15,818	$13,706
2/19	$17,001	$13,992
3/19	$18,224	$14,232
4/19	$18,512	$14,503
5/19	$17,134	$13,265
6/19	$18,790	$14,138
7/19	$18,235	$13,889
8/19	$18,800	$13,280
9/19	$18,718	$13,502
10/19	$19,921	$14,116
11/19	$19,963	$14,151
12/19	$20,929	$15,093
1/20	$20,353	$14,421
2/20	$20,703	$14,007
3/20	$19,016	$12,318
4/20	$20,209	$13,422
5/20	$21,207	$13,267
6/20	$23,233	$14,377
7/20	$25,712	$15,599
8/20	$28,201	$16,152
9/20	$27,337	$15,909
10/20	$27,933	$16,354
11/20	$29,640	$17,668
12/20	$31,607	$18,869
1/21	$33,230	$19,639
2/21	$34,187	$19,883
3/21	$31,919	$19,378
4/21	$32,002	$19,859
5/21	$32,106	$20,101
6/21	$31,618	$20,077
7/21	$26,334	$18,572
8/21	$26,677	$18,996
9/21	$26,074	$18,203
10/21	$27,000	$18,450
11/21	$25,325	$17,736
12/21	$24,869	$17,979
1/22	$23,735	$17,421
2/22	$22,874	$17,012
3/22	$20,145	$16,542
4/22	$19,064	$15,687
5/22	$19,116	$15,760
6/22	$19,232	$15,052
7/22	$18,885	$14,870
8/22	$18,906	$14,868
9/22	$17,101	$12,970
10/22	$14,781	$12,179
11/22	$18,791	$14,469
12/22	$19,200	$14,442
1/23	$20,586	$15,628
2/23	$19,221	$14,562
3/23	$19,536	$15,069
4/23	$18,791	$14,756
5/23	$17,531	$14,485
6/23	$18,402	$14,879
7/23	$19,809	$15,790
8/23	$18,581	$14,778
9/23	$17,730	$14,381
10/23	$17,006	$13,825
11/23	$17,394	$14,786
12/23	$17,699	$15,306
1/24	$16,133	$14,471
2/24	$17,270	$15,281
3/24	$17,928	$15,670
4/24	$18,925	$15,865
5/24	$19,214	$16,112
6/24	$18,816	$16,797
7/24	$18,377	$16,775
8/24	$18,756	$17,102
9/24	$21,767	$18,544
10/24	$21,428	$17,692
11/24	$21,717	$17,111
12/24	$21,126	$17,136

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 12/29/15 (Inception)
Class C, with conversion to Class A after 8 years	18.47%	0.04%	8.66%
Class C, with 1% maximum contingent deferred sales charge and conversion to Class A after 8 years	17.47%	0.04%	8.66%
MSCI All Country Asia ex Japan Net Index	11.96%	2.57%	6.16%

Performance Inception Date

Dec. 29, 2015

AssetsNet

$ 125,093,937

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 814,793

InvestmentCompanyPortfolioTurnover

19.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$125,093,937
# of Portfolio Holdings	32
Portfolio Turnover Rate	19%
Total Advisory Fees Paid	$814,793

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
United States	1.3%
Hong Kong	2.4%
Singapore	4.4%
Taiwan	5.1%
Korea, Republic of	12.0%
India	27.0%
China	47.8%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Trip.com Group Ltd.	8.0%
ICICI Bank Ltd.	6.8%
Coupang, Inc.	6.2%
Meituan	6.1%
HDFC Bank Ltd.	5.2%
Taiwan Semiconductor Manufacturing Co. Ltd.	5.1%
Zomato Ltd.	4.8%
Qifu Technology, Inc.	4.6%
Tencent Holdings Ltd.	4.5%
Full Truck Alliance Co. Ltd.	4.5%
Total	55.8%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000163120

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Asia Opportunity Portfolio

Class Name

Class I

Trading Symbol

MSAQX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Asia Opportunity Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$121	1.10%

Expenses Paid, Amount

$ 121

Expense Ratio, Percent

1.10%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country Asia ex Japan Net Index:

↑ Stock selection in consumer discretionary, led by a Chinese online travel agency, which was the largest positive contributor in the portfolio

↑ Stock selection in industrials, led by a holding in an operator of a Southeast Asian super app (an integrated app platform combining multiple services)

↑ No exposure to materials

↓ Stock selection in communication services, where a holding in a Korean search engine was the main detractor

↓ An underweight allocation to information technology, where exposure to a power management integrated circuit fabless integrated design manufacturer was the main detractor

↓ Stock selection in financials, where a Korean digital bank was the largest detractor in the portfolio

Line Graph [Table Text Block]

	Class I	MSCI All Country Asia ex Japan Net Index
12/15	$1,003,000	$1,000,000
1/16	$940,000	$921,916
2/16	$899,000	$913,360
3/16	$980,000	$1,015,925
4/16	$991,000	$1,006,823
5/16	$989,000	$993,406
6/16	$1,019,000	$1,019,941
7/16	$1,044,442	$1,069,379
8/16	$1,067,474	$1,105,406
9/16	$1,086,500	$1,123,408
10/16	$1,067,474	$1,106,377
11/16	$1,030,422	$1,074,508
12/16	$989,590	$1,052,484
1/17	$1,051,951	$1,117,738
2/17	$1,094,888	$1,155,577
3/17	$1,174,627	$1,193,369
4/17	$1,228,809	$1,219,336
5/17	$1,303,438	$1,272,338
6/17	$1,347,397	$1,292,585
7/17	$1,449,627	$1,361,700
8/17	$1,508,921	$1,379,823
9/17	$1,568,214	$1,378,195
10/17	$1,632,619	$1,443,222
11/17	$1,619,329	$1,452,375
12/17	$1,749,761	$1,491,564
1/18	$1,896,608	$1,604,386
2/18	$1,824,219	$1,524,512
3/18	$1,837,663	$1,501,487
4/18	$1,791,126	$1,512,133
5/18	$1,939,008	$1,492,128
6/18	$1,884,199	$1,420,581
7/18	$1,813,604	$1,432,504
8/18	$1,722,092	$1,417,871
9/18	$1,690,894	$1,398,246
10/18	$1,456,915	$1,246,564
11/18	$1,556,746	$1,312,773
12/18	$1,510,990	$1,277,194
1/19	$1,636,819	$1,370,565
2/19	$1,760,568	$1,399,164
3/19	$1,889,517	$1,423,171
4/19	$1,919,675	$1,450,257
5/19	$1,779,287	$1,326,545
6/19	$1,952,952	$1,413,826
7/19	$1,895,757	$1,388,859
8/19	$1,957,111	$1,328,040
9/19	$1,950,872	$1,350,171
10/19	$2,077,741	$1,411,603
11/19	$2,083,981	$1,415,080
12/19	$2,186,941	$1,509,253
1/20	$2,128,678	$1,442,114
2/20	$2,167,173	$1,400,701
3/20	$1,992,384	$1,231,848
4/20	$2,118,274	$1,342,242
5/20	$2,225,436	$1,326,657
6/20	$2,439,760	$1,437,702
7/20	$2,702,984	$1,559,854
8/20	$2,966,208	$1,615,212
9/20	$2,877,773	$1,590,946
10/20	$2,943,319	$1,635,391
11/20	$3,126,431	$1,766,812
12/20	$3,335,819	$1,886,872
1/21	$3,511,444	$1,963,863
2/21	$3,613,453	$1,988,327
3/21	$3,376,833	$1,937,847
4/21	$3,389,453	$1,985,897
5/21	$3,403,124	$2,010,116
6/21	$3,353,697	$2,007,679
7/21	$2,795,273	$1,857,162
8/21	$2,834,184	$1,899,629
9/21	$2,773,189	$1,820,300
10/21	$2,874,147	$1,845,013
11/21	$2,697,470	$1,773,627
12/21	$2,651,311	$1,797,867
1/22	$2,532,485	$1,742,073
2/22	$2,442,304	$1,701,207
3/22	$2,152,665	$1,654,153
4/22	$2,040,205	$1,568,740
5/22	$2,047,631	$1,575,956
6/22	$2,061,424	$1,505,203
7/22	$2,026,412	$1,486,952
8/22	$2,029,595	$1,486,835
9/22	$1,837,563	$1,296,974
10/22	$1,589,301	$1,217,871
11/22	$2,022,168	$1,446,923
12/22	$2,067,789	$1,444,198
1/23	$2,219,505	$1,562,792
2/23	$2,073,094	$1,456,222
3/23	$2,109,166	$1,506,891
4/23	$2,030,656	$1,475,563
5/23	$1,895,916	$1,448,543
6/23	$1,991,401	$1,487,894
7/23	$2,146,299	$1,579,035
8/23	$2,015,803	$1,477,785
9/23	$1,925,622	$1,438,146
10/23	$1,848,173	$1,382,534
11/23	$1,891,672	$1,478,596
12/23	$1,926,537	$1,530,586
1/24	$1,756,329	$1,447,137
2/24	$1,880,793	$1,528,140
3/24	$1,953,132	$1,566,954
4/24	$2,061,639	$1,586,472
5/24	$2,093,553	$1,611,192
6/24	$2,051,001	$1,679,749
7/24	$2,003,130	$1,677,520
8/24	$2,045,682	$1,710,223
9/24	$2,375,459	$1,854,425
10/24	$2,338,226	$1,769,210
11/24	$2,370,140	$1,711,091
12/24	$2,306,525	$1,713,621

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 12/29/15 (Inception)
Class I	19.72%	1.07%	9.72%
MSCI All Country Asia ex Japan Net Index	11.96%	2.57%	6.16%

Performance Inception Date

Dec. 29, 2015

AssetsNet

$ 125,093,937

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 814,793

InvestmentCompanyPortfolioTurnover

19.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$125,093,937
# of Portfolio Holdings	32
Portfolio Turnover Rate	19%
Total Advisory Fees Paid	$814,793

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
United States	1.3%
Hong Kong	2.4%
Singapore	4.4%
Taiwan	5.1%
Korea, Republic of	12.0%
India	27.0%
China	47.8%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Trip.com Group Ltd.	8.0%
ICICI Bank Ltd.	6.8%
Coupang, Inc.	6.2%
Meituan	6.1%
HDFC Bank Ltd.	5.2%
Taiwan Semiconductor Manufacturing Co. Ltd.	5.1%
Zomato Ltd.	4.8%
Qifu Technology, Inc.	4.6%
Tencent Holdings Ltd.	4.5%
Full Truck Alliance Co. Ltd.	4.5%
Total	55.8%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000163123

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Asia Opportunity Portfolio

Class Name

Class R6

Trading Symbol

MSAYX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Asia Opportunity Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$115	1.05%

Expenses Paid, Amount

$ 115

Expense Ratio, Percent

1.05%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country Asia ex Japan Net Index:

↑ Stock selection in consumer discretionary, led by a Chinese online travel agency, which was the largest positive contributor in the portfolio

↑ Stock selection in industrials, led by a holding in an operator of a Southeast Asian super app (an integrated app platform combining multiple services)

↑ No exposure to materials

↓ Stock selection in communication services, where a holding in a Korean search engine was the main detractor

↓ An underweight allocation to information technology, where exposure to a power management integrated circuit fabless integrated design manufacturer was the main detractor

↓ Stock selection in financials, where a Korean digital bank was the largest detractor in the portfolio

Line Graph [Table Text Block]

	Class R6	MSCI All Country Asia ex Japan Net Index
12/15	$5,015,000	$5,000,000
1/16	$4,700,000	$4,609,579
2/16	$4,495,000	$4,566,799
3/16	$4,900,000	$5,079,623
4/16	$4,955,000	$5,034,113
5/16	$4,945,000	$4,967,029
6/16	$5,095,000	$5,099,705
7/16	$5,227,222	$5,346,893
8/16	$5,337,374	$5,527,028
9/16	$5,437,513	$5,617,039
10/16	$5,342,381	$5,531,886
11/16	$5,157,125	$5,372,542
12/16	$4,950,062	$5,262,422
1/17	$5,261,997	$5,588,692
2/17	$5,476,773	$5,777,883
3/17	$5,875,641	$5,966,843
4/17	$6,146,668	$6,096,680
5/17	$6,519,968	$6,361,692
6/17	$6,739,857	$6,462,923
7/17	$7,251,227	$6,808,501
8/17	$7,547,821	$6,899,114
9/17	$7,844,416	$6,890,975
10/17	$8,171,693	$7,216,108
11/17	$8,100,101	$7,261,873
12/17	$8,752,536	$7,457,819
1/18	$9,487,087	$8,021,929
2/18	$9,130,158	$7,622,562
3/18	$9,192,232	$7,507,433
4/18	$8,964,625	$7,560,667
5/18	$9,699,176	$7,460,640
6/18	$9,430,185	$7,102,905
7/18	$9,071,887	$7,162,519
8/18	$8,619,333	$7,089,355
9/18	$8,463,280	$6,991,229
10/18	$7,292,882	$6,232,818
11/18	$7,792,252	$6,563,864
12/18	$7,563,374	$6,385,969
1/19	$8,192,788	$6,852,823
2/19	$8,811,798	$6,995,820
3/19	$9,456,818	$7,115,855
4/19	$9,612,871	$7,251,287
5/19	$8,910,632	$6,632,724
6/19	$9,779,328	$7,069,131
7/19	$9,493,230	$6,944,293
8/19	$9,800,135	$6,640,202
9/19	$9,768,924	$6,750,855
10/19	$10,408,742	$7,058,017
11/19	$10,434,751	$7,075,398
12/19	$10,953,293	$7,546,264
1/20	$10,656,555	$7,210,572
2/20	$10,854,380	$7,003,504
3/20	$9,979,783	$6,159,242
4/20	$10,614,907	$6,711,212
5/20	$11,140,707	$6,633,286
6/20	$12,218,336	$7,188,508
7/20	$13,535,438	$7,799,272
8/20	$14,857,746	$8,076,062
9/20	$14,415,242	$7,954,730
10/20	$14,743,216	$8,176,955
11/20	$15,659,461	$8,834,062
12/20	$16,712,387	$9,434,361
1/21	$17,591,155	$9,819,313
2/21	$18,106,839	$9,941,635
3/21	$16,922,870	$9,689,234
4/21	$16,980,753	$9,929,485
5/21	$17,049,160	$10,050,582
6/21	$16,807,104	$10,038,395
7/21	$14,012,936	$9,285,810
8/21	$14,207,633	$9,498,143
9/21	$13,902,432	$9,101,500
10/21	$14,407,593	$9,225,065
11/21	$13,528,824	$8,868,135
12/21	$13,292,595	$8,989,335
1/22	$12,703,346	$8,710,367
2/22	$12,252,120	$8,506,037
3/22	$10,797,579	$8,270,764
4/22	$10,229,565	$7,843,700
5/22	$10,266,724	$7,879,779
6/22	$10,341,044	$7,526,016
7/22	$10,160,554	$7,434,761
8/22	$10,181,788	$7,434,175
9/22	$9,215,633	$6,484,871
10/22	$7,973,433	$6,089,356
11/22	$10,144,628	$7,234,614
12/22	$10,372,895	$7,220,988
1/23	$11,137,326	$7,813,959
2/23	$10,404,747	$7,281,108
3/23	$10,585,237	$7,534,453
4/23	$10,187,096	$7,377,813
5/23	$9,512,911	$7,242,714
6/23	$9,995,989	$7,439,468
7/23	$10,771,036	$7,895,173
8/23	$10,112,777	$7,388,927
9/23	$9,661,550	$7,190,729
10/23	$9,279,335	$6,912,671
11/23	$9,491,677	$7,392,982
12/23	$9,667,832	$7,652,929
1/24	$8,820,898	$7,235,687
2/24	$9,444,114	$7,640,702
3/24	$9,806,325	$7,834,771
4/24	$10,354,968	$7,932,358
5/24	$10,514,767	$8,055,961
6/24	$10,307,028	$8,398,745
7/24	$10,072,656	$8,387,601
8/24	$10,280,395	$8,551,114
9/24	$11,936,977	$9,272,123
10/24	$11,755,871	$8,846,049
11/24	$11,915,670	$8,555,455
12/24	$11,592,103	$8,568,107

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 12/29/15 (Inception)
Class R6	19.90%	1.14%	9.79%
MSCI All Country Asia ex Japan Net Index	11.96%	2.57%	6.16%

Performance Inception Date

Dec. 29, 2015

AssetsNet

$ 125,093,937

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 814,793

InvestmentCompanyPortfolioTurnover

19.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$125,093,937
# of Portfolio Holdings	32
Portfolio Turnover Rate	19%
Total Advisory Fees Paid	$814,793

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
United States	1.3%
Hong Kong	2.4%
Singapore	4.4%
Taiwan	5.1%
Korea, Republic of	12.0%
India	27.0%
China	47.8%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Trip.com Group Ltd.	8.0%
ICICI Bank Ltd.	6.8%
Coupang, Inc.	6.2%
Meituan	6.1%
HDFC Bank Ltd.	5.2%
Taiwan Semiconductor Manufacturing Co. Ltd.	5.1%
Zomato Ltd.	4.8%
Qifu Technology, Inc.	4.6%
Tencent Holdings Ltd.	4.5%
Full Truck Alliance Co. Ltd.	4.5%
Total	55.8%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000216355

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Developing Opportunity Portfolio

Class Name

Class A

Trading Symbol

MDOAX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Developing Opportunity Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$159	1.47%

Expenses Paid, Amount

$ 159

Expense Ratio, Percent

1.47%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI Emerging Markets Net Index:

↑ Stock selection in consumer discretionary, led by a Chinese online travel agency, which was the largest positive contributor in the portfolio

↑ Stock selection in industrials, led by a holding in an operator of a Southeast Asian super app (an integrated app platform combining multiple services)

↑ An underweight allocation to materials

↓ An underweight allocation to information technology, where a holding in an Argentinian IT services company was the main detractor

↓ Stock selection in communication services, where a Korean search engine was the largest detractor in the portfolio

↓ An underweight allocation to utilities, where exposure to a Brazilian water management company was the main detractor

Line Graph [Table Text Block]

	Class A with maximum sales charge	MSCI Emerging Markets Net Index
2/20	$9,479	$10,000
2/20	$8,882	$9,095
3/20	$7,848	$7,694
4/20	$8,445	$8,398
5/20	$9,156	$8,463
6/20	$10,038	$9,085
7/20	$11,213	$9,897
8/20	$12,256	$10,116
9/20	$11,858	$9,953
10/20	$12,066	$10,158
11/20	$12,929	$11,098
12/20	$13,716	$11,914
1/21	$14,351	$12,279
2/21	$14,474	$12,373
3/21	$13,441	$12,186
4/21	$13,564	$12,489
5/21	$13,536	$12,779
6/21	$13,687	$12,801
7/21	$11,858	$11,940
8/21	$12,265	$12,252
9/21	$11,716	$11,765
10/21	$12,047	$11,881
11/21	$11,100	$11,397
12/21	$11,118	$11,611
1/22	$10,303	$11,391
2/22	$9,801	$11,051
3/22	$8,995	$10,801
4/22	$8,152	$10,200
5/22	$7,886	$10,245
6/22	$7,498	$9,564
7/22	$7,744	$9,541
8/22	$7,915	$9,581
9/22	$7,242	$8,458
10/22	$6,692	$8,195
11/22	$7,839	$9,410
12/22	$7,725	$9,278
1/23	$8,427	$10,011
2/23	$8,009	$9,362
3/23	$8,161	$9,645
4/23	$7,924	$9,536
5/23	$7,687	$9,376
6/23	$7,981	$9,732
7/23	$8,493	$10,338
8/23	$8,142	$9,701
9/23	$7,773	$9,447
10/23	$7,450	$9,080
11/23	$7,915	$9,807
12/23	$8,104	$10,190
1/24	$7,583	$9,717
2/24	$8,047	$10,179
3/24	$8,265	$10,431
4/24	$8,578	$10,478
5/24	$8,806	$10,537
6/24	$8,720	$10,953
7/24	$8,559	$10,985
8/24	$8,967	$11,163
9/24	$9,943	$11,908
10/24	$9,905	$11,379
11/24	$9,886	$10,970
12/24	$9,433	$10,955

Average Annual Return [Table Text Block]

AATR	1 Year	Since 2/14/20 (Inception)
Class A	16.40%	(0.10)%
Class A, with 5.25% maximum front end sales charge	10.33%	(1.19)%
MSCI Emerging Markets Net Index	7.50%	1.89%

Performance Inception Date

Feb. 14, 2020

AssetsNet

$ 30,908,547

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 13,966

InvestmentCompanyPortfolioTurnover

29.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$30,908,547
# of Portfolio Holdings	31
Portfolio Turnover Rate	29%
Total Advisory Fees Paid	$13,966

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Poland	1.0%
Singapore	3.8%
Taiwan	5.4%
Brazil	6.3%
United States	6.9%
Korea, Republic of	11.2%
India	26.5%
China	38.9%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

MercadoLibre, Inc.	6.9%
Trip.com Group Ltd.	6.8%
Meituan	6.4%
ICICI Bank Ltd.	6.2%
Coupang, Inc.	6.0%
Taiwan Semiconductor Manufacturing Co. Ltd.	5.4%
HDFC Bank Ltd.	5.0%
Zomato Ltd.	4.9%
Grab Holdings Ltd.	3.8%
Tencent Holdings Ltd.	3.7%
Total	55.1%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000216357

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Developing Opportunity Portfolio

Class Name

Class C

Trading Symbol

MDOBX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Developing Opportunity Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$243	2.25%

Expenses Paid, Amount

$ 243

Expense Ratio, Percent

2.25%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI Emerging Markets Net Index:

↑ Stock selection in consumer discretionary, led by a Chinese online travel agency, which was the largest positive contributor in the portfolio

↑ Stock selection in industrials, led by a holding in an operator of a Southeast Asian super app (an integrated app platform combining multiple services)

↑ An underweight allocation to materials

↓ An underweight allocation to information technology, where a holding in an Argentinian IT services company was the main detractor

↓ Stock selection in communication services, where a Korean search engine was the largest detractor in the portfolio

↓ An underweight allocation to utilities, where exposure to a Brazilian water management company was the main detractor

Line Graph [Table Text Block]

	Class C	MSCI Emerging Markets Net Index
2/20	$10,000	$10,000
2/20	$9,370	$9,095
3/20	$8,270	$7,694
4/20	$8,900	$8,398
5/20	$9,640	$8,463
6/20	$10,560	$9,085
7/20	$11,790	$9,897
8/20	$12,860	$10,116
9/20	$12,440	$9,953
10/20	$12,650	$10,158
11/20	$13,550	$11,098
12/20	$14,360	$11,914
1/21	$15,020	$12,279
2/21	$15,140	$12,373
3/21	$14,050	$12,186
4/21	$14,170	$12,489
5/21	$14,130	$12,779
6/21	$14,280	$12,801
7/21	$12,360	$11,940
8/21	$12,780	$12,252
9/21	$12,200	$11,765
10/21	$12,540	$11,881
11/21	$11,550	$11,397
12/21	$11,550	$11,611
1/22	$10,700	$11,391
2/22	$10,180	$11,051
3/22	$9,340	$10,801
4/22	$8,450	$10,200
5/22	$8,170	$10,245
6/22	$7,760	$9,564
7/22	$8,010	$9,541
8/22	$8,180	$9,581
9/22	$7,490	$8,458
10/22	$6,910	$8,195
11/22	$8,100	$9,410
12/22	$7,960	$9,278
1/23	$8,690	$10,011
2/23	$8,250	$9,362
3/23	$8,410	$9,645
4/23	$8,150	$9,536
5/23	$7,900	$9,376
6/23	$8,200	$9,732
7/23	$8,720	$10,338
8/23	$8,350	$9,701
9/23	$7,970	$9,447
10/23	$7,630	$9,080
11/23	$8,100	$9,807
12/23	$8,290	$10,190
1/24	$7,760	$9,717
2/24	$8,230	$10,179
3/24	$8,440	$10,431
4/24	$8,760	$10,478
5/24	$8,990	$10,537
6/24	$8,890	$10,953
7/24	$8,720	$10,985
8/24	$9,130	$11,163
9/24	$10,120	$11,908
10/24	$10,070	$11,379
11/24	$10,050	$10,970
12/24	$9,580	$10,955

Average Annual Return [Table Text Block]

AATR	1 Year	Since 2/14/20 (Inception)
Class C	15.56%	(0.88)%
Class C, with 1% maximum contingent deferred sales charge	14.56%	(0.88)%
MSCI Emerging Markets Net Index	7.50%	1.89%

Performance Inception Date

Feb. 14, 2020

AssetsNet

$ 30,908,547

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 13,966

InvestmentCompanyPortfolioTurnover

29.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$30,908,547
# of Portfolio Holdings	31
Portfolio Turnover Rate	29%
Total Advisory Fees Paid	$13,966

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Poland	1.0%
Singapore	3.8%
Taiwan	5.4%
Brazil	6.3%
United States	6.9%
Korea, Republic of	11.2%
India	26.5%
China	38.9%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

MercadoLibre, Inc.	6.9%
Trip.com Group Ltd.	6.8%
Meituan	6.4%
ICICI Bank Ltd.	6.2%
Coupang, Inc.	6.0%
Taiwan Semiconductor Manufacturing Co. Ltd.	5.4%
HDFC Bank Ltd.	5.0%
Zomato Ltd.	4.9%
Grab Holdings Ltd.	3.8%
Tencent Holdings Ltd.	3.7%
Total	55.1%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000216354

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Developing Opportunity Portfolio

Class Name

Class I

Trading Symbol

MDOEX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Developing Opportunity Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$125	1.15%

Expenses Paid, Amount

$ 125

Expense Ratio, Percent

1.15%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI Emerging Markets Net Index:

↑ Stock selection in consumer discretionary, led by a Chinese online travel agency, which was the largest positive contributor in the portfolio

↑ Stock selection in industrials, led by a holding in an operator of a Southeast Asian super app (an integrated app platform combining multiple services)

↑ An underweight allocation to materials

↓ An underweight allocation to information technology, where a holding in an Argentinian IT services company was the main detractor

↓ Stock selection in communication services, where a Korean search engine was the largest detractor in the portfolio

↓ An underweight allocation to utilities, where exposure to a Brazilian water management company was the main detractor

Line Graph [Table Text Block]

	Class I	MSCI Emerging Markets Net Index
2/20	$1,000,000	$1,000,000
2/20	$937,000	$1,000,000
3/20	$828,000	$769,381
4/20	$892,000	$839,836
5/20	$967,000	$846,287
6/20	$1,061,000	$908,497
7/20	$1,185,000	$989,682
8/20	$1,295,000	$1,011,558
9/20	$1,253,000	$995,334
10/20	$1,276,000	$1,015,840
11/20	$1,367,000	$1,109,793
12/20	$1,450,000	$1,191,378
1/21	$1,518,000	$1,227,903
2/21	$1,532,000	$1,237,294
3/21	$1,423,000	$1,218,608
4/21	$1,436,000	$1,248,949
5/21	$1,433,000	$1,277,912
6/21	$1,449,000	$1,280,115
7/21	$1,256,000	$1,193,965
8/21	$1,300,000	$1,225,217
9/21	$1,242,000	$1,176,526
10/21	$1,277,000	$1,188,130
11/21	$1,177,000	$1,139,710
12/21	$1,179,000	$1,161,095
1/22	$1,094,000	$1,139,117
2/22	$1,040,000	$1,105,068
3/22	$956,000	$1,080,109
4/22	$866,000	$1,020,027
5/22	$838,000	$1,024,518
6/22	$797,000	$956,439
7/22	$823,000	$954,090
8/22	$841,000	$958,073
9/22	$770,000	$845,756
10/22	$711,000	$819,496
11/22	$834,000	$941,042
12/22	$821,000	$927,815
1/23	$897,000	$1,001,077
2/23	$852,000	$936,165
3/23	$869,000	$964,518
4/23	$844,000	$953,588
5/23	$819,000	$937,571
6/23	$850,000	$973,171
7/23	$905,000	$1,033,752
8/23	$868,000	$970,073
9/23	$828,000	$944,703
10/23	$794,000	$907,997
11/23	$844,000	$980,664
12/23	$865,000	$1,019,002
1/24	$809,000	$971,686
2/24	$859,000	$1,017,912
3/24	$883,000	$1,043,135
4/24	$916,000	$1,047,802
5/24	$941,000	$1,053,720
6/24	$932,000	$1,095,283
7/24	$915,000	$1,098,543
8/24	$959,000	$1,116,279
9/24	$1,063,000	$1,190,819
10/24	$1,060,000	$1,137,859
11/24	$1,058,000	$1,096,976
12/24	$1,010,271	$1,095,469

Average Annual Return [Table Text Block]

AATR	1 Year	Since 2/14/20 (Inception)
Class I	16.79%	0.21%
MSCI Emerging Markets Net Index	7.50%	1.89%

Performance Inception Date

Feb. 14, 2020

AssetsNet

$ 30,908,547

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 13,966

InvestmentCompanyPortfolioTurnover

29.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$30,908,547
# of Portfolio Holdings	31
Portfolio Turnover Rate	29%
Total Advisory Fees Paid	$13,966

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Poland	1.0%
Singapore	3.8%
Taiwan	5.4%
Brazil	6.3%
United States	6.9%
Korea, Republic of	11.2%
India	26.5%
China	38.9%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

MercadoLibre, Inc.	6.9%
Trip.com Group Ltd.	6.8%
Meituan	6.4%
ICICI Bank Ltd.	6.2%
Coupang, Inc.	6.0%
Taiwan Semiconductor Manufacturing Co. Ltd.	5.4%
HDFC Bank Ltd.	5.0%
Zomato Ltd.	4.9%
Grab Holdings Ltd.	3.8%
Tencent Holdings Ltd.	3.7%
Total	55.1%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000216356

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Developing Opportunity Portfolio

Class Name

Class R6

Trading Symbol

MDODX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Developing Opportunity Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$119	1.10%

Expenses Paid, Amount

$ 119

Expense Ratio, Percent

1.10%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI Emerging Markets Net Index:

↑ Stock selection in consumer discretionary, led by a Chinese online travel agency, which was the largest positive contributor in the portfolio

↑ Stock selection in industrials, led by a holding in an operator of a Southeast Asian super app (an integrated app platform combining multiple services)

↑ An underweight allocation to materials

↓ An underweight allocation to information technology, where a holding in an Argentinian IT services company was the main detractor

↓ Stock selection in communication services, where a Korean search engine was the largest detractor in the portfolio

↓ An underweight allocation to utilities, where exposure to a Brazilian water management company was the main detractor

Line Graph [Table Text Block]

	Class R6	MSCI Emerging Markets Net Index
2/20	$5,000,000	$5,000,000
2/20	$4,685,000	$5,000,000
3/20	$4,140,000	$3,846,906
4/20	$4,460,000	$4,199,182
5/20	$4,835,000	$4,231,435
6/20	$5,310,000	$4,542,484
7/20	$5,925,000	$4,948,409
8/20	$6,475,000	$5,057,791
9/20	$6,265,000	$4,976,668
10/20	$6,380,000	$5,079,202
11/20	$6,835,000	$5,548,965
12/20	$7,255,000	$5,956,888
1/21	$7,595,000	$6,139,513
2/21	$7,665,000	$6,186,472
3/21	$7,115,000	$6,093,041
4/21	$7,185,000	$6,244,744
5/21	$7,170,000	$6,389,561
6/21	$7,250,000	$6,400,573
7/21	$6,285,000	$5,969,824
8/21	$6,505,000	$6,126,086
9/21	$6,215,000	$5,882,631
10/21	$6,395,000	$5,940,651
11/21	$5,895,000	$5,698,550
12/21	$5,900,000	$5,805,475
1/22	$5,475,000	$5,695,583
2/22	$5,205,000	$5,525,341
3/22	$4,785,000	$5,400,547
4/22	$4,330,000	$5,100,134
5/22	$4,195,000	$5,122,590
6/22	$3,990,000	$4,782,196
7/22	$4,120,000	$4,770,448
8/22	$4,210,000	$4,790,363
9/22	$3,855,000	$4,228,778
10/22	$3,560,000	$4,097,482
11/22	$4,175,000	$4,705,211
12/22	$4,115,000	$4,639,076
1/23	$4,490,000	$5,005,384
2/23	$4,270,000	$4,680,823
3/23	$4,355,000	$4,822,592
4/23	$4,225,000	$4,767,940
5/23	$4,100,000	$4,687,856
6/23	$4,260,000	$4,865,853
7/23	$4,535,000	$5,168,759
8/23	$4,345,000	$4,850,363
9/23	$4,150,000	$4,723,515
10/23	$3,980,000	$4,539,984
11/23	$4,230,000	$4,903,319
12/23	$4,335,000	$5,095,010
1/24	$4,055,000	$4,858,430
2/24	$4,305,000	$5,089,558
3/24	$4,425,000	$5,215,675
4/24	$4,590,000	$5,239,011
5/24	$4,720,000	$5,268,602
6/24	$4,670,000	$5,476,415
7/24	$4,585,000	$5,492,713
8/24	$4,805,000	$5,581,395
9/24	$5,330,000	$5,954,093
10/24	$5,315,000	$5,689,295
11/24	$5,305,000	$5,484,878
12/24	$5,063,877	$5,477,346

Average Annual Return [Table Text Block]

AATR	1 Year	Since 2/14/20 (Inception)
Class R6	16.81%	0.26%
MSCI Emerging Markets Net Index	7.50%	1.89%

Performance Inception Date

Feb. 14, 2020

AssetsNet

$ 30,908,547

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 13,966

InvestmentCompanyPortfolioTurnover

29.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$30,908,547
# of Portfolio Holdings	31
Portfolio Turnover Rate	29%
Total Advisory Fees Paid	$13,966

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Poland	1.0%
Singapore	3.8%
Taiwan	5.4%
Brazil	6.3%
United States	6.9%
Korea, Republic of	11.2%
India	26.5%
China	38.9%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

MercadoLibre, Inc.	6.9%
Trip.com Group Ltd.	6.8%
Meituan	6.4%
ICICI Bank Ltd.	6.2%
Coupang, Inc.	6.0%
Taiwan Semiconductor Manufacturing Co. Ltd.	5.4%
HDFC Bank Ltd.	5.0%
Zomato Ltd.	4.9%
Grab Holdings Ltd.	3.8%
Tencent Holdings Ltd.	3.7%
Total	55.1%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000236912

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets ex China Portfolio

Class Name

Class A

Trading Symbol

MSDQX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Emerging Markets ex China Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$138	1.35%

Expenses Paid, Amount

$ 138

Expense Ratio, Percent

1.35%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI Emerging Markets ex China Net Index:

↑ The underweight allocation to and positioning in Korea, where equities underperformed on currency weakness and political volatility

↑ Positioning in India, through allocations to select auto manufacturers, an online travel company and a hospital operator

↑ Stock selection in South Africa, through the allocation to a leading digital bank and select insurance and consumer goods companies

↓ Positioning in Poland, as the allocation to an apparel retailer (sold) underperformed following a short-seller report

↓ Overweight allocations to Mexico, which sold off following both the Mexico and U.S. elections, and Brazil, which underperformed on budget and fiscal risks

↓ Zero allocation to the United Arab Emirates

Line Graph [Table Text Block]

	Class A with maximum sales charge	MSCI Emerging Markets ex China Net Index
9/22	$9,479	$10,000
10/22	$9,934	$10,315
11/22	$10,938	$11,280
12/22	$10,313	$10,798
1/23	$11,156	$11,450
2/23	$10,540	$10,932
3/23	$10,749	$11,186
4/23	$10,787	$11,278
5/23	$10,910	$11,436
6/23	$11,441	$11,862
7/23	$11,829	$12,377
8/23	$11,270	$11,768
9/23	$11,024	$11,467
10/23	$10,720	$11,040
11/23	$11,725	$12,182
12/23	$12,488	$12,961
1/24	$12,237	$12,638
2/24	$12,670	$13,087
3/24	$13,183	$13,480
4/24	$13,102	$13,262
5/24	$13,273	$13,249
6/24	$14,048	$14,052
7/24	$13,998	$14,170
8/24	$13,968	$14,427
9/24	$14,109	$14,608
10/24	$13,595	$14,042
11/24	$13,364	$13,583
12/24	$13,105	$13,422

Average Annual Return [Table Text Block]

AATR	1 Year	Since 9/30/22 (Inception)
Class A	4.94%	15.47%
Class A, with 5.25% maximum front end sales charge	(0.59)%	12.76%
MSCI Emerging Markets ex China Net Index	3.56%	13.96%

Performance Inception Date

Sep. 30, 2022

AssetsNet

$ 6,969,773

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 0

InvestmentCompanyPortfolioTurnover

32.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$6,969,773
# of Portfolio Holdings	81
Portfolio Turnover Rate	32%
Total Advisory Fees Paid (Net of Waivers)	$0

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	6.3%
United Kingdom	1.3%
Malaysia	1.8%
Poland	3.1%
Mexico	4.3%
Indonesia	4.7%
Brazil	5.1%
South Africa	6.2%
Korea, Republic of	8.8%
Taiwan	27.0%
India	31.4%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Taiwan Semiconductor Manufacturing Co. Ltd.	17.3%
Samsung Electronics Co. Ltd.	3.2%
HDFC Bank Ltd.	3.1%
ICICI Bank Ltd.	3.1%
Mahindra & Mahindra Ltd.	2.9%
Reliance Industries Ltd.	2.6%
Infosys Ltd.	2.3%
State Bank of India	2.3%
Capitec Bank Holdings Ltd.	2.1%
Hon Hai Precision Industry Co. Ltd.	2.1%
Total	41.0%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000236913

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets ex China Portfolio

Class Name

Class C

Trading Symbol

MSDOX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$214	2.10%

Expenses Paid, Amount

$ 214

Expense Ratio, Percent

2.10%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI Emerging Markets ex China Net Index:

↑ The underweight allocation to and positioning in Korea, where equities underperformed on currency weakness and political volatility

↑ Positioning in India, through allocations to select auto manufacturers, an online travel company and a hospital operator

↑ Stock selection in South Africa, through the allocation to a leading digital bank and select insurance and consumer goods companies

↓ Positioning in Poland, as the allocation to an apparel retailer (sold) underperformed following a short-seller report

↓ Overweight allocations to Mexico, which sold off following both the Mexico and U.S. elections, and Brazil, which underperformed on budget and fiscal risks

↓ Zero allocation to the United Arab Emirates

Line Graph [Table Text Block]

	Class C	MSCI Emerging Markets ex China Net Index
9/22	$10,000	$10,000
10/22	$10,470	$10,315
11/22	$11,530	$11,280
12/22	$10,860	$10,798
1/23	$11,740	$11,450
2/23	$11,090	$10,932
3/23	$11,290	$11,186
4/23	$11,330	$11,278
5/23	$11,460	$11,436
6/23	$12,000	$11,862
7/23	$12,400	$12,377
8/23	$11,810	$11,768
9/23	$11,540	$11,467
10/23	$11,220	$11,040
11/23	$12,260	$12,182
12/23	$13,056	$12,961
1/24	$12,781	$12,638
2/24	$13,224	$13,087
3/24	$13,752	$13,480
4/24	$13,657	$13,262
5/24	$13,825	$13,249
6/24	$14,627	$14,052
7/24	$14,564	$14,170
8/24	$14,522	$14,427
9/24	$14,669	$14,608
10/24	$14,121	$14,042
11/24	$13,878	$13,583
12/24	$13,602	$13,422

Average Annual Return [Table Text Block]

AATR	1 Year	Since 9/30/22 (Inception)
Class C	4.19%	14.64%
Class C, with 1% maximum contingent deferred sales charge	3.20%	14.64%
MSCI Emerging Markets ex China Net Index	3.56%	13.96%

Performance Inception Date

Sep. 30, 2022

AssetsNet

$ 6,969,773

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 0

InvestmentCompanyPortfolioTurnover

32.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$6,969,773
# of Portfolio Holdings	81
Portfolio Turnover Rate	32%
Total Advisory Fees Paid (Net of Waivers)	$0

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	6.3%
United Kingdom	1.3%
Malaysia	1.8%
Poland	3.1%
Mexico	4.3%
Indonesia	4.7%
Brazil	5.1%
South Africa	6.2%
Korea, Republic of	8.8%
Taiwan	27.0%
India	31.4%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Taiwan Semiconductor Manufacturing Co. Ltd.	17.3%
Samsung Electronics Co. Ltd.	3.2%
HDFC Bank Ltd.	3.1%
ICICI Bank Ltd.	3.1%
Mahindra & Mahindra Ltd.	2.9%
Reliance Industries Ltd.	2.6%
Infosys Ltd.	2.3%
State Bank of India	2.3%
Capitec Bank Holdings Ltd.	2.1%
Hon Hai Precision Industry Co. Ltd.	2.1%
Total	41.0%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000236914

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets ex China Portfolio

Class Name

Class I

Trading Symbol

MSDUX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$101	0.98%

Expenses Paid, Amount

$ 101

Expense Ratio, Percent

0.98%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI Emerging Markets ex China Net Index:

↑ The underweight allocation to and positioning in Korea, where equities underperformed on currency weakness and political volatility

↑ Positioning in India, through allocations to select auto manufacturers, an online travel company and a hospital operator

↑ Stock selection in South Africa, through the allocation to a leading digital bank and select insurance and consumer goods companies

↓ Positioning in Poland, as the allocation to an apparel retailer (sold) underperformed following a short-seller report

↓ Overweight allocations to Mexico, which sold off following both the Mexico and U.S. elections, and Brazil, which underperformed on budget and fiscal risks

↓ Zero allocation to the United Arab Emirates

Line Graph [Table Text Block]

	Class I	MSCI Emerging Markets ex China Net Index
9/22	$1,000,000	$1,000,000
10/22	$1,048,000	$1,000,000
11/22	$1,155,000	$1,127,979
12/22	$1,089,000	$1,079,771
1/23	$1,178,000	$1,145,006
2/23	$1,114,000	$1,093,201
3/23	$1,136,000	$1,118,592
4/23	$1,141,000	$1,127,759
5/23	$1,154,000	$1,143,647
6/23	$1,210,000	$1,186,244
7/23	$1,251,000	$1,237,685
8/23	$1,193,000	$1,176,768
9/23	$1,167,000	$1,146,687
10/23	$1,136,000	$1,103,985
11/23	$1,242,000	$1,218,155
12/23	$1,323,941	$1,296,060
1/24	$1,297,313	$1,263,820
2/24	$1,343,113	$1,308,724
3/24	$1,398,499	$1,348,031
4/24	$1,389,978	$1,326,236
5/24	$1,408,085	$1,324,854
6/24	$1,492,229	$1,405,207
7/24	$1,486,904	$1,417,009
8/24	$1,483,709	$1,442,715
9/24	$1,499,685	$1,460,844
10/24	$1,445,364	$1,404,181
11/24	$1,420,867	$1,358,278
12/24	$1,394,275	$1,342,211

Average Annual Return [Table Text Block]

AATR	1 Year	Since 9/30/22 (Inception)
Class I	5.31%	15.90%
MSCI Emerging Markets ex China Net Index	3.56%	13.96%

Performance Inception Date

Sep. 30, 2022

AssetsNet

$ 6,969,773

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 0

InvestmentCompanyPortfolioTurnover

32.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$6,969,773
# of Portfolio Holdings	81
Portfolio Turnover Rate	32%
Total Advisory Fees Paid (Net of Waivers)	$0

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	6.3%
United Kingdom	1.3%
Malaysia	1.8%
Poland	3.1%
Mexico	4.3%
Indonesia	4.7%
Brazil	5.1%
South Africa	6.2%
Korea, Republic of	8.8%
Taiwan	27.0%
India	31.4%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Taiwan Semiconductor Manufacturing Co. Ltd.	17.3%
Samsung Electronics Co. Ltd.	3.2%
HDFC Bank Ltd.	3.1%
ICICI Bank Ltd.	3.1%
Mahindra & Mahindra Ltd.	2.9%
Reliance Industries Ltd.	2.6%
Infosys Ltd.	2.3%
State Bank of India	2.3%
Capitec Bank Holdings Ltd.	2.1%
Hon Hai Precision Industry Co. Ltd.	2.1%
Total	41.0%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000236911

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets ex China Portfolio

Class Name

Class R6

Trading Symbol

MSDMX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$98	0.95%

Expenses Paid, Amount

$ 98

Expense Ratio, Percent

0.95%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI Emerging Markets ex China Net Index:

↑ The underweight allocation to and positioning in Korea, where equities underperformed on currency weakness and political volatility

↑ Positioning in India, through allocations to select auto manufacturers, an online travel company and a hospital operator

↑ Stock selection in South Africa, through the allocation to a leading digital bank and select insurance and consumer goods companies

↓ Positioning in Poland, as the allocation to an apparel retailer (sold) underperformed following a short-seller report

↓ Overweight allocations to Mexico, which sold off following both the Mexico and U.S. elections, and Brazil, which underperformed on budget and fiscal risks

↓ Zero allocation to the United Arab Emirates

Line Graph [Table Text Block]

	Class R6	MSCI Emerging Markets ex China Net Index
9/22	$5,000,000	$5,000,000
10/22	$5,240,000	$5,000,000
11/22	$5,775,000	$5,639,894
12/22	$5,445,000	$5,398,856
1/23	$5,890,000	$5,725,032
2/23	$5,570,000	$5,466,004
3/23	$5,680,000	$5,592,959
4/23	$5,705,000	$5,638,794
5/23	$5,775,000	$5,718,234
6/23	$6,050,000	$5,931,222
7/23	$6,260,000	$6,188,423
8/23	$5,965,000	$5,883,839
9/23	$5,835,000	$5,733,436
10/23	$5,680,000	$5,519,923
11/23	$6,215,000	$6,090,776
12/23	$6,621,870	$6,480,302
1/24	$6,488,686	$6,319,102
2/24	$6,717,761	$6,543,618
3/24	$6,994,783	$6,740,156
4/24	$6,952,164	$6,631,180
5/24	$7,048,056	$6,624,272
6/24	$7,463,587	$7,026,033
7/24	$7,436,951	$7,085,046
8/24	$7,420,969	$7,213,573
9/24	$7,500,879	$7,304,219
10/24	$7,229,185	$7,020,904
11/24	$7,111,984	$6,791,388
12/24	$6,975,438	$6,711,054

Average Annual Return [Table Text Block]

AATR	1 Year	Since 9/30/22 (Inception)
Class R6	5.34%	15.93%
MSCI Emerging Markets ex China Net Index	3.56%	13.96%

Performance Inception Date

Sep. 30, 2022

AssetsNet

$ 6,969,773

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 0

InvestmentCompanyPortfolioTurnover

32.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$6,969,773
# of Portfolio Holdings	81
Portfolio Turnover Rate	32%
Total Advisory Fees Paid (Net of Waivers)	$0

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	6.3%
United Kingdom	1.3%
Malaysia	1.8%
Poland	3.1%
Mexico	4.3%
Indonesia	4.7%
Brazil	5.1%
South Africa	6.2%
Korea, Republic of	8.8%
Taiwan	27.0%
India	31.4%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Taiwan Semiconductor Manufacturing Co. Ltd.	17.3%
Samsung Electronics Co. Ltd.	3.2%
HDFC Bank Ltd.	3.1%
ICICI Bank Ltd.	3.1%
Mahindra & Mahindra Ltd.	2.9%
Reliance Industries Ltd.	2.6%
Infosys Ltd.	2.3%
State Bank of India	2.3%
Capitec Bank Holdings Ltd.	2.1%
Hon Hai Precision Industry Co. Ltd.	2.1%
Total	41.0%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000149048

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets Leaders Portfolio

Class Name

Class A

Trading Symbol

MELAX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Emerging Markets Leaders Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$138	1.37%

Expenses Paid, Amount

$ 138

Expense Ratio, Percent

1.37%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI Emerging Net Markets Index:

↑ Underweight allocation and stock selection in Korea, led by zero exposure to a South Korean memory chipmaker

↑ Zero exposure to Indonesia and Saudi Arabia

↑ Stock selection and underweight in real estate, led by an Indian luxury real estate developer

↓ Underweight allocation and stock selection in China, as the broader China market rallied after the September 2024 policy stimulus announcements

↓ Stock selection and underweight to Taiwan, where exposure to an integrated circuit maker detracted as the company was impacted by the slower-than-expected recovery in non-artificial intelligence semiconductors in the second half of 2024

↓ Stock selection and overweight in industrials, where exposure to a Brazilian rental car company was the main detractor due to higher-for-longer interest rates

Line Graph [Table Text Block]

	Class A with maximum sales charge	MSCI Emerging Markets Index
12/14	$9,477	$10,000
1/15	$9,394	$10,060
2/15	$9,734	$10,371
3/15	$9,697	$10,224
4/15	$9,743	$11,010
5/15	$9,587	$10,569
6/15	$9,421	$10,295
7/15	$9,467	$9,581
8/15	$8,669	$8,715
9/15	$8,659	$8,452
10/15	$8,972	$9,055
11/15	$8,898	$8,702
12/15	$8,760	$8,508
1/16	$8,416	$7,956
2/16	$8,342	$7,943
3/16	$9,150	$8,994
4/16	$9,196	$9,043
5/16	$9,104	$8,706
6/16	$9,354	$9,054
7/16	$9,660	$9,509
8/16	$9,697	$9,746
9/16	$10,022	$9,871
10/16	$9,641	$9,895
11/16	$8,990	$9,439
12/16	$8,990	$9,460
1/17	$9,334	$9,978
2/17	$9,586	$10,283
3/17	$9,967	$10,543
4/17	$10,301	$10,774
5/17	$10,552	$11,092
6/17	$10,562	$11,204
7/17	$11,017	$11,872
8/17	$11,120	$12,136
9/17	$10,850	$12,088
10/17	$10,850	$12,512
11/17	$11,027	$12,537
12/17	$11,279	$12,987
1/18	$11,719	$14,069
2/18	$11,195	$13,421
3/18	$11,270	$13,171
4/18	$11,027	$13,113
5/18	$10,578	$12,648
6/18	$10,503	$12,123
7/18	$10,705	$12,389
8/18	$10,621	$12,054
9/18	$10,001	$11,990
10/18	$9,091	$10,946
11/18	$9,823	$11,397
12/18	$9,654	$11,095
1/19	$10,086	$12,066
2/19	$10,095	$12,094
3/19	$10,442	$12,195
4/19	$10,649	$12,452
5/19	$10,358	$11,548
6/19	$11,127	$12,269
7/19	$11,212	$12,119
8/19	$10,808	$11,528
9/19	$11,052	$11,748
10/19	$11,418	$12,244
11/19	$11,718	$12,227
12/19	$12,172	$13,139
1/20	$12,357	$12,526
2/20	$12,172	$11,866
3/20	$9,773	$10,038
4/20	$10,861	$10,958
5/20	$11,677	$11,042
6/20	$12,930	$11,853
7/20	$14,397	$12,913
8/20	$15,728	$13,198
9/20	$15,621	$12,986
10/20	$16,388	$13,254
11/20	$17,904	$14,480
12/20	$19,331	$15,544
1/21	$19,979	$16,021
2/21	$20,242	$16,143
3/21	$18,825	$15,899
4/21	$19,969	$16,295
5/21	$19,938	$16,673
6/21	$21,164	$16,702
7/21	$19,746	$15,578
8/21	$21,467	$15,986
9/21	$20,587	$15,350
10/21	$20,830	$15,502
11/21	$20,090	$14,870
12/21	$19,632	$15,149
1/22	$17,605	$14,862
2/22	$16,845	$14,418
3/22	$16,216	$14,092
4/22	$14,544	$13,308
5/22	$14,199	$13,367
6/22	$13,409	$12,479
7/22	$14,138	$12,448
8/22	$14,078	$12,500
9/22	$12,689	$11,035
10/22	$12,253	$10,692
11/22	$13,287	$12,278
12/22	$13,013	$12,105
1/23	$13,713	$13,061
2/23	$13,206	$12,214
3/23	$13,176	$12,584
4/23	$13,074	$12,442
5/23	$13,206	$12,233
6/23	$13,763	$12,697
7/23	$14,078	$13,488
8/23	$13,530	$12,657
9/23	$13,206	$12,326
10/23	$12,628	$11,847
11/23	$13,895	$12,795
12/23	$14,554	$13,295
1/24	$13,865	$12,678
2/24	$14,270	$13,281
3/24	$14,828	$13,610
4/24	$14,595	$13,671
5/24	$14,878	$13,748
6/24	$15,770	$14,290
7/24	$15,760	$14,333
8/24	$16,318	$14,564
9/24	$16,267	$15,537
10/24	$15,851	$14,846
11/24	$15,527	$14,312
12/24	$14,828	$14,293

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class A	1.88%	4.03%	4.58%
Class A, with 5.25% maximum front end sales charge	(3.50)%	2.92%	4.02%
MSCI Emerging Markets Index	7.50%	1.70%	3.64%

AssetsNet

$ 188,147,993

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 1,468,667

InvestmentCompanyPortfolioTurnover

58.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$188,147,993
# of Portfolio Holdings	33
Portfolio Turnover Rate	58%
Total Advisory Fees Paid	$1,468,667

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Korea, Republic of	3.1%
Mexico	3.5%
Argentina	4.4%
Brazil	10.5%
United States	12.2%
Taiwan	20.0%
India	46.3%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Taiwan Semiconductor Manufacturing Co. Ltd.	11.0%
MercadoLibre, Inc.	8.4%
KEI Industries Ltd.	5.3%
HDFC Bank Ltd.	5.3%
Varun Beverages Ltd.	5.1%
Globant SA	4.4%
ICICI Bank Ltd.	4.4%
Localiza Rent a Car SA	3.9%
Bharti Airtel Ltd.	3.6%
TVS Motor Co. Ltd.	3.2%
Total	54.6%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155912

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets Leaders Portfolio

Class Name

Class C

Trading Symbol

MEMLX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$213	2.12%

Expenses Paid, Amount

$ 213

Expense Ratio, Percent

2.12%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI Emerging Net Markets Index:

↑ Underweight allocation and stock selection in Korea, led by zero exposure to a South Korean memory chipmaker

↑ Zero exposure to Indonesia and Saudi Arabia

↑ Stock selection and underweight in real estate, led by an Indian luxury real estate developer

↓ Underweight allocation and stock selection in China, as the broader China market rallied after the September 2024 policy stimulus announcements

↓ Stock selection and overweight in industrials, where exposure to a Brazilian rental car company was the main detractor due to higher-for-longer interest rates

Line Graph [Table Text Block]

	Class C	MSCI Emerging Markets Index
4/15	$10,000	$10,000
5/15	$9,840	$9,600
6/15	$9,661	$9,350
7/15	$9,708	$8,702
8/15	$8,878	$7,915
9/15	$8,860	$7,677
10/15	$9,171	$8,225
11/15	$9,095	$7,904
12/15	$8,939	$7,728
1/16	$8,588	$7,226
2/16	$8,512	$7,214
3/16	$9,328	$8,169
4/16	$9,366	$8,213
5/16	$9,271	$7,907
6/16	$9,518	$8,223
7/16	$9,820	$8,637
8/16	$9,849	$8,852
9/16	$10,172	$8,965
10/16	$9,792	$8,987
11/16	$9,118	$8,573
12/16	$9,108	$8,592
1/17	$9,459	$9,062
2/17	$9,706	$9,340
3/17	$10,077	$9,575
4/17	$10,419	$9,785
5/17	$10,656	$10,074
6/17	$10,666	$10,176
7/17	$11,121	$10,782
8/17	$11,216	$11,023
9/17	$10,932	$10,979
10/17	$10,932	$11,364
11/17	$11,102	$11,387
12/17	$11,342	$11,795
1/18	$11,780	$12,778
2/18	$11,247	$12,189
3/18	$11,313	$11,962
4/18	$11,065	$11,910
5/18	$10,608	$11,488
6/18	$10,532	$11,010
7/18	$10,719	$11,252
8/18	$10,623	$10,948
9/18	$10,002	$10,890
10/18	$9,084	$9,941
11/18	$9,810	$10,351
12/18	$9,638	$10,077
1/19	$10,068	$10,959
2/19	$10,068	$10,984
3/19	$10,413	$11,076
4/19	$10,604	$11,309
5/19	$10,308	$10,489
6/19	$11,063	$11,143
7/19	$11,149	$11,007
8/19	$10,738	$10,470
9/19	$10,967	$10,670
10/19	$11,331	$11,120
11/19	$11,617	$11,105
12/19	$12,061	$11,933
1/20	$12,229	$11,377
2/20	$12,051	$10,777
3/20	$9,663	$9,117
4/20	$10,733	$9,952
5/20	$11,536	$10,028
6/20	$12,765	$10,766
7/20	$14,202	$11,728
8/20	$15,510	$11,987
9/20	$15,391	$11,795
10/20	$16,134	$12,038
11/20	$17,621	$13,151
12/20	$19,007	$14,118
1/21	$19,638	$14,551
2/21	$19,876	$14,662
3/21	$18,479	$14,440
4/21	$19,587	$14,800
5/21	$19,535	$15,143
6/21	$20,735	$15,169
7/21	$19,328	$14,148
8/21	$21,004	$14,519
9/21	$20,125	$13,942
10/21	$20,352	$14,079
11/21	$19,618	$13,506
12/21	$19,149	$13,759
1/22	$17,161	$13,499
2/22	$16,415	$13,095
3/22	$15,793	$12,799
4/22	$14,147	$12,087
5/22	$13,805	$12,141
6/22	$13,028	$11,334
7/22	$13,743	$11,306
8/22	$13,670	$11,353
9/22	$12,303	$10,022
10/22	$11,879	$9,711
11/22	$12,873	$11,151
12/22	$12,604	$10,995
1/23	$13,267	$11,863
2/23	$12,780	$11,094
3/23	$12,738	$11,430
4/23	$12,635	$11,300
5/23	$12,762	$11,110
6/23	$13,301	$11,532
7/23	$13,604	$12,250
8/23	$13,076	$11,495
9/23	$12,762	$11,195
10/23	$12,204	$10,760
11/23	$13,428	$11,621
12/23	$14,065	$12,075
1/24	$13,399	$11,514
2/24	$13,791	$12,062
3/24	$14,329	$12,361
4/24	$14,104	$12,416
5/24	$14,378	$12,487
6/24	$15,240	$12,979
7/24	$15,230	$13,018
8/24	$15,769	$13,228
9/24	$15,720	$14,111
10/24	$15,318	$13,484
11/24	$15,005	$12,999
12/24	$14,329	$12,981

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 4/30/15 (Inception)
Class C, with conversion to Class A after 8 years	1.11%	3.24%	3.79%
Class C, with 1% maximum contingent deferred sales charge and conversion to Class A after 8 years	0.11%	3.24%	3.79%
MSCI Emerging Markets Index	7.50%	1.70%	2.73%

Performance Inception Date

Apr. 30, 2015

AssetsNet

$ 188,147,993

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 1,468,667

InvestmentCompanyPortfolioTurnover

58.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$188,147,993
# of Portfolio Holdings	33
Portfolio Turnover Rate	58%
Total Advisory Fees Paid	$1,468,667

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Korea, Republic of	3.1%
Mexico	3.5%
Argentina	4.4%
Brazil	10.5%
United States	12.2%
Taiwan	20.0%
India	46.3%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Taiwan Semiconductor Manufacturing Co. Ltd.	11.0%
MercadoLibre, Inc.	8.4%
KEI Industries Ltd.	5.3%
HDFC Bank Ltd.	5.3%
Varun Beverages Ltd.	5.1%
Globant SA	4.4%
ICICI Bank Ltd.	4.4%
Localiza Rent a Car SA	3.9%
Bharti Airtel Ltd.	3.6%
TVS Motor Co. Ltd.	3.2%
Total	54.6%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000149047

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets Leaders Portfolio

Class Name

Class I

Trading Symbol

MELIX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$103	1.02%

Expenses Paid, Amount

$ 103

Expense Ratio, Percent

1.02%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI Emerging Net Markets Index:

↑ Underweight allocation and stock selection in Korea, led by zero exposure to a South Korean memory chipmaker

↑ Zero exposure to Indonesia and Saudi Arabia

↑ Stock selection and underweight in real estate, led by an Indian luxury real estate developer

↓ Underweight allocation and stock selection in China, as the broader China market rallied after the September 2024 policy stimulus announcements

↓ Stock selection and overweight in industrials, where exposure to a Brazilian rental car company was the main detractor due to higher-for-longer interest rates

Line Graph [Table Text Block]

	Class I	MSCI Emerging Markets Index
12/14	$1,000,000	$1,000,000
1/15	$991,279	$1,005,995
2/15	$1,028,101	$1,037,143
3/15	$1,023,256	$1,022,394
4/15	$1,029,070	$1,101,032
5/15	$1,013,566	$1,056,939
6/15	$996,124	$1,029,489
7/15	$1,001,938	$958,126
8/15	$916,667	$871,467
9/15	$915,698	$845,249
10/15	$948,643	$905,544
11/15	$942,829	$870,221
12/15	$927,676	$850,823
1/16	$891,354	$795,626
2/16	$884,483	$794,324
3/16	$969,888	$899,435
4/16	$975,778	$904,324
5/16	$965,961	$870,590
6/16	$993,448	$905,385
7/16	$1,025,734	$950,946
8/16	$1,029,664	$974,579
9/16	$1,065,035	$987,111
10/16	$1,025,734	$989,464
11/16	$955,977	$943,918
12/16	$956,291	$946,003
1/17	$993,639	$997,771
2/17	$1,020,175	$1,028,315
3/17	$1,061,454	$1,054,273
4/17	$1,097,818	$1,077,354
5/17	$1,124,355	$1,109,206
6/17	$1,126,320	$1,120,371
7/17	$1,175,462	$1,187,156
8/17	$1,186,273	$1,213,636
9/17	$1,157,771	$1,208,811
10/17	$1,158,754	$1,251,186
11/17	$1,178,410	$1,253,698
12/17	$1,204,981	$1,298,702
1/18	$1,252,625	$1,406,944
2/18	$1,197,041	$1,342,056
3/18	$1,204,981	$1,317,103
4/18	$1,179,175	$1,311,276
5/18	$1,132,524	$1,264,812
6/18	$1,124,583	$1,212,263
7/18	$1,146,036	$1,238,893
8/18	$1,137,075	$1,205,394
9/18	$1,071,360	$1,198,997
10/18	$973,782	$1,094,585
11/18	$1,053,437	$1,139,693
12/18	$1,034,893	$1,109,501
1/19	$1,081,752	$1,206,646
2/19	$1,083,746	$1,209,359
3/19	$1,121,632	$1,219,509
4/19	$1,143,566	$1,245,182
5/19	$1,112,659	$1,154,829
6/19	$1,195,411	$1,226,904
7/19	$1,205,381	$1,211,901
8/19	$1,161,513	$1,152,813
9/19	$1,188,432	$1,174,820
10/19	$1,228,312	$1,224,358
11/19	$1,261,213	$1,222,673
12/19	$1,310,463	$1,313,891
1/20	$1,330,068	$1,252,645
2/20	$1,311,494	$1,186,589
3/20	$1,052,498	$1,003,827
4/20	$1,171,161	$1,095,751
5/20	$1,258,870	$1,104,168
6/20	$1,395,075	$1,185,334
7/20	$1,552,950	$1,291,258
8/20	$1,697,410	$1,319,800
9/20	$1,687,092	$1,298,632
10/20	$1,769,640	$1,325,387
11/20	$1,933,706	$1,447,969
12/20	$2,088,363	$1,554,414
1/21	$2,159,301	$1,602,069
2/21	$2,187,246	$1,614,323
3/21	$2,035,697	$1,589,942
4/21	$2,159,301	$1,629,528
5/21	$2,156,076	$1,667,318
6/21	$2,290,428	$1,670,191
7/21	$2,137,804	$1,557,790
8/21	$2,323,747	$1,598,565
9/21	$2,229,163	$1,535,037
10/21	$2,256,034	$1,550,177
11/21	$2,176,498	$1,487,002
12/21	$2,126,743	$1,514,904
1/22	$1,907,292	$1,486,228
2/22	$1,825,535	$1,441,805
3/22	$1,758,839	$1,409,240
4/22	$1,577,039	$1,330,849
5/22	$1,540,463	$1,336,709
6/22	$1,455,480	$1,247,885
7/22	$1,535,085	$1,244,820
8/22	$1,528,630	$1,250,017
9/22	$1,378,026	$1,103,474
10/22	$1,331,769	$1,069,213
11/22	$1,443,646	$1,227,797
12/22	$1,414,601	$1,210,539
1/23	$1,489,903	$1,306,125
2/23	$1,436,116	$1,221,433
3/23	$1,432,889	$1,258,427
4/23	$1,423,207	$1,244,165
5/23	$1,437,192	$1,223,268
6/23	$1,497,434	$1,269,715
7/23	$1,531,857	$1,348,757
8/23	$1,472,692	$1,265,673
9/23	$1,438,268	$1,232,573
10/23	$1,376,950	$1,184,681
11/23	$1,514,645	$1,279,492
12/23	$1,586,720	$1,329,512
1/24	$1,512,494	$1,267,778
2/24	$1,556,599	$1,328,089
3/24	$1,617,917	$1,360,999
4/24	$1,593,175	$1,367,089
5/24	$1,624,371	$1,374,810
6/24	$1,722,264	$1,429,038
7/24	$1,722,264	$1,433,290
8/24	$1,783,581	$1,456,432
9/24	$1,778,202	$1,553,685
10/24	$1,733,021	$1,484,587
11/24	$1,697,522	$1,431,246
12/24	$1,622,220	$1,429,280

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class I	2.24%	4.36%	4.96%
MSCI Emerging Markets Index	7.50%	1.70%	3.64%

AssetsNet

$ 188,147,993

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 1,468,667

InvestmentCompanyPortfolioTurnover

58.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$188,147,993
# of Portfolio Holdings	33
Portfolio Turnover Rate	58%
Total Advisory Fees Paid	$1,468,667

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Korea, Republic of	3.1%
Mexico	3.5%
Argentina	4.4%
Brazil	10.5%
United States	12.2%
Taiwan	20.0%
India	46.3%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Taiwan Semiconductor Manufacturing Co. Ltd.	11.0%
MercadoLibre, Inc.	8.4%
KEI Industries Ltd.	5.3%
HDFC Bank Ltd.	5.3%
Varun Beverages Ltd.	5.1%
Globant SA	4.4%
ICICI Bank Ltd.	4.4%
Localiza Rent a Car SA	3.9%
Bharti Airtel Ltd.	3.6%
TVS Motor Co. Ltd.	3.2%
Total	54.6%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000226932

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets Leaders Portfolio

Class Name

Class IR

Trading Symbol

MSIWX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class IR	$98	0.97%

Expenses Paid, Amount

$ 98

Expense Ratio, Percent

0.97%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI Emerging Net Markets Index:

↑ Underweight allocation and stock selection in Korea, led by zero exposure to a South Korean memory chipmaker

↑ Zero exposure to Indonesia and Saudi Arabia

↑ Stock selection and underweight in real estate, led by an Indian luxury real estate developer

↓ Underweight allocation and stock selection in China, as the broader China market rallied after the September 2024 policy stimulus announcements

↓ Stock selection and overweight in industrials, where exposure to a Brazilian rental car company was the main detractor due to higher-for-longer interest rates

Line Graph [Table Text Block]

	Class IR	MSCI Emerging Markets Index
4/21	$5,000,000	$5,000,000
4/21	$5,193,598	$5,000,000
5/21	$5,185,854	$5,218,216
6/21	$5,508,518	$5,227,209
7/21	$5,141,972	$4,875,426
8/21	$5,588,539	$5,003,041
9/21	$5,363,965	$4,804,217
10/21	$5,428,498	$4,851,600
11/21	$5,237,481	$4,653,882
12/21	$5,117,990	$4,741,205
1/22	$4,590,948	$4,651,459
2/22	$4,394,599	$4,512,426
3/22	$4,231,836	$4,410,510
4/22	$3,797,802	$4,165,169
5/22	$3,707,378	$4,183,508
6/22	$3,503,278	$3,905,515
7/22	$3,697,044	$3,895,921
8/22	$3,689,293	$3,912,186
9/22	$3,317,264	$3,453,551
10/22	$3,206,171	$3,346,324
11/22	$3,477,443	$3,842,643
12/22	$3,405,104	$3,788,633
1/23	$3,588,535	$4,087,789
2/23	$3,456,775	$3,822,727
3/23	$3,451,608	$3,938,507
4/23	$3,425,772	$3,893,873
5/23	$3,461,942	$3,828,470
6/23	$3,606,620	$3,973,837
7/23	$3,689,293	$4,221,213
8/23	$3,547,199	$3,961,186
9/23	$3,464,525	$3,857,592
10/23	$3,314,680	$3,707,706
11/23	$3,647,957	$4,004,434
12/23	$3,823,637	$4,160,984
1/24	$3,642,789	$3,967,775
2/24	$3,748,715	$4,156,531
3/24	$3,895,976	$4,259,528
4/24	$3,839,138	$4,278,587
5/24	$3,914,061	$4,302,753
6/24	$4,149,163	$4,472,469
7/24	$4,149,163	$4,485,779
8/24	$4,296,425	$4,558,204
9/24	$4,283,507	$4,862,578
10/24	$4,177,582	$4,646,324
11/24	$4,092,325	$4,479,380
12/24	$3,908,894	$4,473,229

Average Annual Return [Table Text Block]

AATR	1 Year	Since 4/12/21 (Inception)
Class IR	2.23%	(6.40)%
MSCI Emerging Markets Index	7.50%	(2.95)%

Performance Inception Date

Apr. 12, 2021

AssetsNet

$ 188,147,993

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 1,468,667

InvestmentCompanyPortfolioTurnover

58.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$188,147,993
# of Portfolio Holdings	33
Portfolio Turnover Rate	58%
Total Advisory Fees Paid	$1,468,667

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Korea, Republic of	3.1%
Mexico	3.5%
Argentina	4.4%
Brazil	10.5%
United States	12.2%
Taiwan	20.0%
India	46.3%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Taiwan Semiconductor Manufacturing Co. Ltd.	11.0%
MercadoLibre, Inc.	8.4%
KEI Industries Ltd.	5.3%
HDFC Bank Ltd.	5.3%
Varun Beverages Ltd.	5.1%
Globant SA	4.4%
ICICI Bank Ltd.	4.4%
Localiza Rent a Car SA	3.9%
Bharti Airtel Ltd.	3.6%
TVS Motor Co. Ltd.	3.2%
Total	54.6%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000149050

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets Leaders Portfolio

Class Name

Class R6

Trading Symbol

MELSX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$98	0.97%

Expenses Paid, Amount

$ 98

Expense Ratio, Percent

0.97%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI Emerging Net Markets Index:

↑ Underweight allocation and stock selection in Korea, led by zero exposure to a South Korean memory chipmaker

↑ Zero exposure to Indonesia and Saudi Arabia

↑ Stock selection and underweight in real estate, led by an Indian luxury real estate developer

↓ Underweight allocation and stock selection in China, as the broader China market rallied after the September 2024 policy stimulus announcements

↓ Stock selection and overweight in industrials, where exposure to a Brazilian rental car company was the main detractor due to higher-for-longer interest rates

Line Graph [Table Text Block]

	Class R6	MSCI Emerging Markets Index
12/14	$5,000,000	$5,000,000
1/15	$4,956,395	$5,029,973
2/15	$5,140,504	$5,185,714
3/15	$5,121,124	$5,111,971
4/15	$5,150,194	$5,505,159
5/15	$5,072,674	$5,284,697
6/15	$4,985,465	$5,147,445
7/15	$5,009,690	$4,790,630
8/15	$4,588,178	$4,357,333
9/15	$4,583,333	$4,226,247
10/15	$4,748,062	$4,527,722
11/15	$4,714,147	$4,351,106
12/15	$4,638,910	$4,254,113
1/16	$4,462,190	$3,978,131
2/16	$4,427,828	$3,971,622
3/16	$4,854,902	$4,497,176
4/16	$4,879,446	$4,521,618
5/16	$4,835,266	$4,352,952
6/16	$4,967,807	$4,526,927
7/16	$5,129,258	$4,754,730
8/16	$5,148,910	$4,872,896
9/16	$5,325,781	$4,935,554
10/16	$5,129,258	$4,947,322
11/16	$4,785,342	$4,719,592
12/16	$4,782,471	$4,730,014
1/17	$4,969,248	$4,988,854
2/17	$5,106,873	$5,141,573
3/17	$5,308,396	$5,271,363
4/17	$5,490,258	$5,386,772
5/17	$5,622,967	$5,546,028
6/17	$5,632,798	$5,601,857
7/17	$5,878,557	$5,935,782
8/17	$5,932,624	$6,068,181
9/17	$5,790,084	$6,044,053
10/17	$5,794,999	$6,255,932
11/17	$5,893,302	$6,268,490
12/17	$6,026,981	$6,493,511
1/18	$6,265,280	$7,034,718
2/18	$5,987,265	$6,710,281
3/18	$6,026,981	$6,585,515
4/18	$5,897,903	$6,556,378
5/18	$5,664,568	$6,324,059
6/18	$5,624,852	$6,061,314
7/18	$5,732,155	$6,194,464
8/18	$5,692,313	$6,026,971
9/18	$5,363,623	$5,994,984
10/18	$4,875,569	$5,472,925
11/18	$5,269,000	$5,698,463
12/18	$5,181,351	$5,547,503
1/19	$5,415,959	$6,033,229
2/19	$5,425,942	$6,046,794
3/19	$5,615,626	$6,097,543
4/19	$5,725,442	$6,225,908
5/19	$5,570,701	$5,774,147
6/19	$5,985,009	$6,134,518
7/19	$6,034,926	$6,059,506
8/19	$5,820,284	$5,764,064
9/19	$5,950,067	$5,874,099
10/19	$6,154,726	$6,121,791
11/19	$6,314,459	$6,113,367
12/19	$6,566,200	$6,569,457
1/20	$6,664,357	$6,263,224
2/20	$6,571,366	$5,932,945
3/20	$5,274,658	$5,019,136
4/20	$5,863,601	$5,478,757
5/20	$6,307,892	$5,520,838
6/20	$6,989,826	$5,926,670
7/20	$7,785,416	$6,456,288
8/20	$8,508,680	$6,599,001
9/20	$8,451,852	$6,493,158
10/20	$8,870,311	$6,626,936
11/20	$9,691,732	$7,239,845
12/20	$10,466,031	$7,772,071
1/21	$10,826,558	$8,010,346
2/21	$10,966,464	$8,071,614
3/21	$10,202,363	$7,949,712
4/21	$10,826,558	$8,147,642
5/21	$10,810,415	$8,336,588
6/21	$11,483,039	$8,350,956
7/21	$10,713,557	$7,788,949
8/21	$11,649,850	$7,992,827
9/21	$11,181,703	$7,675,186
10/21	$11,316,228	$7,750,885
11/21	$10,918,035	$7,435,012
12/21	$10,668,945	$7,574,519
1/22	$9,570,275	$7,431,141
2/22	$9,160,967	$7,209,023
3/22	$8,821,672	$7,046,202
4/22	$7,916,885	$6,654,247
5/22	$7,728,388	$6,683,545
6/22	$7,302,922	$6,239,426
7/22	$7,706,845	$6,224,099
8/22	$7,679,917	$6,250,083
9/22	$6,920,542	$5,517,372
10/22	$6,683,574	$5,346,067
11/22	$7,249,066	$6,138,983
12/22	$7,103,654	$6,052,695
1/23	$7,486,034	$6,530,625
2/23	$7,211,367	$6,107,164
3/23	$7,200,595	$6,292,133
4/23	$7,146,739	$6,220,826
5/23	$7,222,138	$6,116,340
6/23	$7,523,734	$6,348,576
7/23	$7,696,074	$6,743,784
8/23	$7,399,864	$6,328,365
9/23	$7,227,524	$6,162,864
10/23	$6,915,157	$5,923,407
11/23	$7,609,904	$6,397,458
12/23	$7,976,127	$6,647,562
1/24	$7,599,132	$6,338,891
2/24	$7,819,944	$6,640,447
3/24	$8,126,925	$6,804,995
4/24	$8,008,441	$6,835,443
5/24	$8,164,624	$6,874,051
6/24	$8,654,717	$7,145,188
7/24	$8,654,717	$7,166,452
8/24	$8,967,084	$7,282,158
9/24	$8,940,156	$7,768,424
10/24	$8,713,959	$7,422,937
11/24	$8,536,233	$7,156,230
12/24	$8,153,853	$7,146,402

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class R6	2.23%	4.43%	5.01%
MSCI Emerging Markets Index	7.50%	1.70%	3.64%

AssetsNet

$ 188,147,993

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 1,468,667

InvestmentCompanyPortfolioTurnover

58.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$188,147,993
# of Portfolio Holdings	33
Portfolio Turnover Rate	58%
Total Advisory Fees Paid	$1,468,667

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Korea, Republic of	3.1%
Mexico	3.5%
Argentina	4.4%
Brazil	10.5%
United States	12.2%
Taiwan	20.0%
India	46.3%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Taiwan Semiconductor Manufacturing Co. Ltd.	11.0%
MercadoLibre, Inc.	8.4%
KEI Industries Ltd.	5.3%
HDFC Bank Ltd.	5.3%
Varun Beverages Ltd.	5.1%
Globant SA	4.4%
ICICI Bank Ltd.	4.4%
Localiza Rent a Car SA	3.9%
Bharti Airtel Ltd.	3.6%
TVS Motor Co. Ltd.	3.2%
Total	54.6%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000007747

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets Portfolio

Class Name

Class A

Trading Symbol

MMKBX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Emerging Markets Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$140	1.35%

Expenses Paid, Amount

$ 140

Expense Ratio, Percent

1.35%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to ↑ and detractors from ↓ performance, relative to the MSCI Emerging Markets Index:

↑ Positioning in India, through the allocations to select consumer, industrial and health care companies ↑ The underweight allocation to and positioning in Korea, where equities underperformed on currency weakness and political volatility ↑ Stock selections in South Africa and Taiwan, through allocations to a leading bank and consumer company in South Africa and overweights to select technology companies in Taiwan ↓ Positioning in Poland, as the allocation to an apparel retailer (sold) underperformed following a short-seller report ↓ Overweight allocations to Mexico, which sold off following both the Mexico and U.S. elections, and Brazil, which underperformed on budget and fiscal risks ↓ Underweight allocation to China, which outperformed for the full year after rallying in September

Line Graph [Table Text Block]

	Class A with maximum sales charge	MSCI Emerging Markets Index
12/14	$9,473	$10,000
1/15	$9,565	$10,060
2/15	$9,851	$10,371
3/15	$9,763	$10,224
4/15	$10,272	$11,010
5/15	$9,996	$10,569
6/15	$9,908	$10,295
7/15	$9,472	$9,581
8/15	$8,689	$8,715
9/15	$8,518	$8,452
10/15	$8,896	$9,055
11/15	$8,676	$8,702
12/15	$8,466	$8,508
1/16	$7,963	$7,956
2/16	$7,910	$7,943
3/16	$8,846	$8,994
4/16	$8,854	$9,043
5/16	$8,748	$8,706
6/16	$9,009	$9,054
7/16	$9,442	$9,509
8/16	$9,628	$9,746
9/16	$9,791	$9,871
10/16	$9,711	$9,895
11/16	$8,988	$9,439
12/16	$9,005	$9,460
1/17	$9,489	$9,978
2/17	$9,715	$10,283
3/17	$10,016	$10,543
4/17	$10,376	$10,774
5/17	$10,699	$11,092
6/17	$10,775	$11,204
7/17	$11,340	$11,872
8/17	$11,540	$12,136
9/17	$11,513	$12,088
10/17	$11,726	$12,512
11/17	$11,762	$12,537
12/17	$12,116	$12,987
1/18	$13,072	$14,069
2/18	$12,423	$13,421
3/18	$12,334	$13,171
4/18	$11,987	$13,113
5/18	$11,404	$12,648
6/18	$10,981	$12,123
7/18	$11,213	$12,389
8/18	$10,888	$12,054
9/18	$10,661	$11,990
10/18	$9,909	$10,946
11/18	$10,270	$11,397
12/18	$9,986	$11,095
1/19	$10,771	$12,066
2/19	$10,640	$12,094
3/19	$10,703	$12,195
4/19	$10,989	$12,452
5/19	$10,376	$11,548
6/19	$10,948	$12,269
7/19	$10,876	$12,119
8/19	$10,494	$11,528
9/19	$10,708	$11,748
10/19	$11,166	$12,244
11/19	$11,089	$12,227
12/19	$11,892	$13,139
1/20	$11,283	$12,526
2/20	$10,793	$11,866
3/20	$8,703	$10,038
4/20	$9,379	$10,958
5/20	$9,678	$11,042
6/20	$10,427	$11,853
7/20	$11,505	$12,913
8/20	$11,675	$13,198
9/20	$11,572	$12,986
10/20	$11,587	$13,254
11/20	$12,598	$14,480
12/20	$13,582	$15,544
1/21	$13,951	$16,021
2/21	$14,091	$16,143
3/21	$13,894	$15,899
4/21	$14,294	$16,295
5/21	$14,637	$16,673
6/21	$14,803	$16,702
7/21	$14,086	$15,578
8/21	$14,699	$15,986
9/21	$13,972	$15,350
10/21	$14,284	$15,502
11/21	$13,504	$14,870
12/21	$14,020	$15,149
1/22	$13,566	$14,862
2/22	$12,544	$14,418
3/22	$12,288	$14,092
4/22	$11,221	$13,308
5/22	$11,419	$13,367
6/22	$10,324	$12,479
7/22	$10,624	$12,448
8/22	$10,465	$12,500
9/22	$9,449	$11,035
10/22	$9,523	$10,692
11/22	$10,891	$12,278
12/22	$10,472	$12,105
1/23	$11,348	$13,061
2/23	$10,519	$12,214
3/23	$10,750	$12,584
4/23	$10,732	$12,442
5/23	$10,602	$12,233
6/23	$11,141	$12,697
7/23	$11,661	$13,488
8/23	$10,957	$12,657
9/23	$10,727	$12,326
10/23	$10,437	$11,847
11/23	$11,147	$12,795
12/23	$11,701	$13,295
1/24	$11,326	$12,678
2/24	$11,840	$13,281
3/24	$12,203	$13,610
4/24	$12,282	$13,671
5/24	$12,439	$13,748
6/24	$13,008	$14,290
7/24	$12,899	$14,333
8/24	$12,977	$14,564
9/24	$13,540	$15,537
10/24	$13,038	$14,846
11/24	$12,741	$14,312
12/24	$12,601	$14,293

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class A	7.69%	1.17%	2.89%
Class A, with 5.25% maximum front end sales charge	2.05%	0.08%	2.34%
MSCI Emerging Markets Index	7.50%	1.70%	3.64%

AssetsNet

$ 518,898,517

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 3,648,970

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$518,898,517
# of Portfolio Holdings	97
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$3,648,970

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	5.0%
Poland	2.0%
Indonesia	2.6%
South Africa	3.9%
Mexico	4.5%
Brazil	4.9%
United States	4.9%
Korea, Republic of	6.4%
Taiwan	20.1%
China	21.6%
India	24.1%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Taiwan Semiconductor Manufacturing Co. Ltd.	12.7%
Tencent Holdings Ltd.	5.1%
Mahindra & Mahindra Ltd.	2.9%
Alibaba Group Holding Ltd.	2.7%
China Construction Bank Corp.	2.3%
WEG SA	2.0%
Samsung Electronics Co. Ltd.	2.0%
Reliance Industries Ltd.	1.9%
ICICI Bank Ltd.	1.9%
State Bank of India	1.7%
Total	35.2%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155890

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets Portfolio

Class Name

Class C

Trading Symbol

MSEPX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Emerging Markets Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$217	2.10%

Expenses Paid, Amount

$ 217

Expense Ratio, Percent

2.10%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to ↑ and detractors from ↓ performance, relative to the MSCI Emerging Markets Index:

↓ Positioning in Poland, as the allocation to an apparel retailer (sold) underperformed following a short-seller report ↓ Overweight allocations to Mexico, which sold off following both the Mexico and U.S. elections, and Brazil, which underperformed on budget and fiscal risks ↓ Underweight allocation to China, which outperformed for the full year after rallying in September ↑ Positioning in India, through the allocations to select consumer, industrial and health care companies ↑ The underweight allocation to and positioning in Korea, where equities underperformed on currency weakness and political volatility ↑ Stock selections in South Africa and Taiwan, through allocations to a leading bank and consumer company in South Africa and overweights to select technology companies in Taiwan

Line Graph [Table Text Block]

	Class C	MSCI Emerging Markets Index
4/15	$10,000	$10,000
5/15	$9,724	$9,600
6/15	$9,633	$9,350
7/15	$9,200	$8,702
8/15	$8,435	$7,915
9/15	$8,266	$7,677
10/15	$8,629	$8,225
11/15	$8,409	$7,904
12/15	$8,197	$7,728
1/16	$7,704	$7,226
2/16	$7,648	$7,214
3/16	$8,547	$8,169
4/16	$8,552	$8,213
5/16	$8,443	$7,907
6/16	$8,690	$8,223
7/16	$9,101	$8,637
8/16	$9,270	$8,852
9/16	$9,425	$8,965
10/16	$9,339	$8,987
11/16	$8,642	$8,573
12/16	$8,653	$8,592
1/17	$9,107	$9,062
2/17	$9,320	$9,340
3/17	$9,601	$9,575
4/17	$9,939	$9,785
5/17	$10,246	$10,074
6/17	$10,311	$10,176
7/17	$10,841	$10,782
8/17	$11,023	$11,023
9/17	$10,993	$10,979
10/17	$11,188	$11,364
11/17	$11,218	$11,387
12/17	$11,548	$11,795
1/18	$12,449	$12,778
2/18	$11,820	$12,189
3/18	$11,729	$11,962
4/18	$11,392	$11,910
5/18	$10,833	$11,488
6/18	$10,421	$11,010
7/18	$10,634	$11,252
8/18	$10,322	$10,948
9/18	$10,101	$10,890
10/18	$9,382	$9,941
11/18	$9,720	$10,351
12/18	$9,439	$10,077
1/19	$10,178	$10,959
2/19	$10,047	$10,984
3/19	$10,104	$11,076
4/19	$10,366	$11,309
5/19	$9,780	$10,489
6/19	$10,314	$11,143
7/19	$10,235	$11,007
8/19	$9,872	$10,470
9/19	$10,064	$10,670
10/19	$10,488	$11,120
11/19	$10,405	$11,105
12/19	$11,153	$11,933
1/20	$10,576	$11,377
2/20	$10,109	$10,777
3/20	$8,147	$9,117
4/20	$8,773	$9,952
5/20	$9,046	$10,028
6/20	$9,742	$10,766
7/20	$10,740	$11,728
8/20	$10,894	$11,987
9/20	$10,790	$11,795
10/20	$10,795	$12,038
11/20	$11,734	$13,151
12/20	$12,639	$14,118
1/21	$12,973	$14,551
2/21	$13,098	$14,662
3/21	$12,903	$14,440
4/21	$13,268	$14,800
5/21	$13,573	$15,143
6/21	$13,723	$15,169
7/21	$13,048	$14,148
8/21	$13,603	$14,519
9/21	$12,923	$13,942
10/21	$13,203	$14,079
11/21	$12,474	$13,506
12/21	$12,946	$13,759
1/22	$12,514	$13,499
2/22	$11,565	$13,095
3/22	$11,323	$12,799
4/22	$10,331	$12,087
5/22	$10,509	$12,141
6/22	$9,495	$11,334
7/22	$9,765	$11,306
8/22	$9,608	$11,353
9/22	$8,670	$10,022
10/22	$8,735	$9,711
11/22	$9,980	$11,151
12/22	$9,594	$10,995
1/23	$10,384	$11,863
2/23	$9,627	$11,094
3/23	$9,829	$11,430
4/23	$9,807	$11,300
5/23	$9,688	$11,110
6/23	$10,180	$11,532
7/23	$10,655	$12,250
8/23	$10,012	$11,495
9/23	$9,801	$11,195
10/23	$9,536	$10,760
11/23	$10,185	$11,621
12/23	$10,691	$12,075
1/24	$10,349	$11,514
2/24	$10,818	$12,062
3/24	$11,150	$12,361
4/24	$11,222	$12,416
5/24	$11,366	$12,487
6/24	$11,885	$12,979
7/24	$11,786	$13,018
8/24	$11,858	$13,228
9/24	$12,372	$14,111
10/24	$11,913	$13,484
11/24	$11,642	$12,999
12/24	$11,514	$12,981

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 4/30/15 (Inception)
Class C, with conversion to Class A after 8 years	6.89%	0.40%	1.47%
Class C, with 1% maximum contingent deferred sales charge and conversion to Class A after 8 years	5.89%	0.40%	1.47%
MSCI Emerging Markets Index	7.50%	1.70%	2.73%

Performance Inception Date

Apr. 30, 2015

AssetsNet

$ 518,898,517

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 3,648,970

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$518,898,517
# of Portfolio Holdings	97
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$3,648,970

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	5.0%
Poland	2.0%
Indonesia	2.6%
South Africa	3.9%
Mexico	4.5%
Brazil	4.9%
United States	4.9%
Korea, Republic of	6.4%
Taiwan	20.1%
China	21.6%
India	24.1%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Taiwan Semiconductor Manufacturing Co. Ltd.	12.7%
Tencent Holdings Ltd.	5.1%
Mahindra & Mahindra Ltd.	2.9%
Alibaba Group Holding Ltd.	2.7%
China Construction Bank Corp.	2.3%
WEG SA	2.0%
Samsung Electronics Co. Ltd.	2.0%
Reliance Industries Ltd.	1.9%
ICICI Bank Ltd.	1.9%
State Bank of India	1.7%
Total	35.2%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000007746

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets Portfolio

Class Name

Class I

Trading Symbol

MGEMX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Emerging Markets Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$103	0.99%

Expenses Paid, Amount

$ 103

Expense Ratio, Percent

0.99%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to ↑ and detractors from ↓ performance, relative to the MSCI Emerging Markets Index:

Line Graph [Table Text Block]

	Class I	MSCI Emerging Markets Index
12/14	$1,000,000	$1,000,000
1/15	$1,009,941	$1,005,995
2/15	$1,040,669	$1,037,143
3/15	$1,031,631	$1,022,394
4/15	$1,085,856	$1,101,032
5/15	$1,056,936	$1,056,939
6/15	$1,047,899	$1,029,489
7/15	$1,002,180	$958,126
8/15	$919,344	$871,467
9/15	$901,691	$845,249
10/15	$941,977	$905,544
11/15	$918,892	$870,221
12/15	$896,707	$850,823
1/16	$843,397	$795,626
2/16	$837,929	$794,324
3/16	$937,715	$899,435
4/16	$938,626	$904,324
5/16	$927,235	$870,590
6/16	$955,485	$905,385
7/16	$1,002,085	$950,946
8/16	$1,021,224	$974,579
9/16	$1,038,996	$987,111
10/16	$1,030,794	$989,464
11/16	$954,692	$943,918
12/16	$957,031	$946,003
1/17	$1,008,489	$997,771
2/17	$1,032,840	$1,028,315
3/17	$1,065,001	$1,054,273
4/17	$1,103,595	$1,077,354
5/17	$1,138,513	$1,109,206
6/17	$1,147,242	$1,120,372
7/17	$1,207,214	$1,187,156
8/17	$1,228,829	$1,213,636
9/17	$1,226,529	$1,208,811
10/17	$1,249,064	$1,251,186
11/17	$1,253,663	$1,253,698
12/17	$1,291,724	$1,298,702
1/18	$1,393,896	$1,406,944
2/18	$1,325,011	$1,342,056
3/18	$1,315,764	$1,317,103
4/18	$1,279,241	$1,311,276
5/18	$1,217,290	$1,264,812
6/18	$1,172,445	$1,212,263
7/18	$1,197,475	$1,238,893
8/18	$1,163,262	$1,205,394
9/18	$1,139,682	$1,198,997
10/18	$1,059,234	$1,094,585
11/18	$1,098,533	$1,139,693
12/18	$1,067,958	$1,109,501
1/19	$1,152,295	$1,206,646
2/19	$1,138,555	$1,209,359
3/19	$1,145,662	$1,219,509
4/19	$1,176,459	$1,245,182
5/19	$1,111,548	$1,154,829
6/19	$1,173,143	$1,226,904
7/19	$1,165,088	$1,211,901
8/19	$1,124,814	$1,152,813
9/19	$1,148,031	$1,174,820
10/19	$1,197,307	$1,224,358
11/19	$1,189,252	$1,222,674
12/19	$1,275,537	$1,313,891
1/20	$1,210,387	$1,252,645
2/20	$1,158,159	$1,186,589
3/20	$934,712	$1,003,827
4/20	$1,006,861	$1,095,751
5/20	$1,039,167	$1,104,168
6/20	$1,119,931	$1,185,334
7/20	$1,236,232	$1,291,258
8/20	$1,255,077	$1,319,800
9/20	$1,244,308	$1,298,632
10/20	$1,245,923	$1,325,387
11/20	$1,355,224	$1,447,969
12/20	$1,461,484	$1,554,414
1/21	$1,501,763	$1,602,069
2/21	$1,517,004	$1,614,323
3/21	$1,496,320	$1,589,942
4/21	$1,539,321	$1,629,528
5/21	$1,576,878	$1,667,318
6/21	$1,595,385	$1,670,191
7/21	$1,518,637	$1,557,790
8/21	$1,585,043	$1,598,565
9/21	$1,507,206	$1,535,037
10/21	$1,540,409	$1,550,177
11/21	$1,457,129	$1,487,002
12/21	$1,513,391	$1,514,904
1/22	$1,464,610	$1,486,228
2/22	$1,355,151	$1,441,805
3/22	$1,327,191	$1,409,240
4/22	$1,212,378	$1,330,849
5/22	$1,234,389	$1,336,709
6/22	$1,116,007	$1,247,885
7/22	$1,148,725	$1,244,820
8/22	$1,132,069	$1,250,017
9/22	$1,022,015	$1,103,474
10/22	$1,030,938	$1,069,213
11/22	$1,179,065	$1,227,797
12/22	$1,134,097	$1,210,539
1/23	$1,229,226	$1,306,125
2/23	$1,140,314	$1,221,433
3/23	$1,165,185	$1,258,427
4/23	$1,163,319	$1,244,165
5/23	$1,150,262	$1,223,268
6/23	$1,208,086	$1,269,715
7/23	$1,265,289	$1,348,757
8/23	$1,189,434	$1,265,673
9/23	$1,164,563	$1,232,573
10/23	$1,134,097	$1,184,681
11/23	$1,211,195	$1,279,492
12/23	$1,272,024	$1,329,512
1/24	$1,231,218	$1,267,778
2/24	$1,287,327	$1,328,090
3/24	$1,327,496	$1,360,999
4/24	$1,336,423	$1,367,089
5/24	$1,354,276	$1,374,810
6/24	$1,416,123	$1,429,038
7/24	$1,405,284	$1,433,290
8/24	$1,413,573	$1,456,432
9/24	$1,475,421	$1,553,685
10/24	$1,421,224	$1,484,587
11/24	$1,389,344	$1,431,246
12/24	$1,374,722	$1,429,280

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class I	8.07%	1.51%	3.23%
MSCI Emerging Markets Index	7.50%	1.70%	3.64%

AssetsNet

$ 518,898,517

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 3,648,970

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$518,898,517
# of Portfolio Holdings	97
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$3,648,970

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	5.0%
Poland	2.0%
Indonesia	2.6%
South Africa	3.9%
Mexico	4.5%
Brazil	4.9%
United States	4.9%
Korea, Republic of	6.4%
Taiwan	20.1%
China	21.6%
India	24.1%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Taiwan Semiconductor Manufacturing Co. Ltd.	12.7%
Tencent Holdings Ltd.	5.1%
Mahindra & Mahindra Ltd.	2.9%
Alibaba Group Holding Ltd.	2.7%
China Construction Bank Corp.	2.3%
WEG SA	2.0%
Samsung Electronics Co. Ltd.	2.0%
Reliance Industries Ltd.	1.9%
ICICI Bank Ltd.	1.9%
State Bank of India	1.7%
Total	35.2%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000198815

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets Portfolio

Class Name

Class IR

Trading Symbol

MRGEX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Emerging Markets Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class IR	$99	0.95%

Expenses Paid, Amount

$ 99

Expense Ratio, Percent

0.95%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to ↑ and detractors from ↓ performance, relative to the MSCI Emerging Markets Index:

Line Graph [Table Text Block]

	Class IR	MSCI Emerging Markets Index
6/18	$5,000,000	$5,000,000
6/18	$4,837,972	$5,000,000
7/18	$4,941,175	$4,920,809
8/18	$4,802,014	$4,787,754
9/18	$4,702,885	$4,762,344
10/18	$4,373,093	$4,347,627
11/18	$4,535,130	$4,526,791
12/18	$4,409,110	$4,406,871
1/19	$4,757,301	$4,792,725
2/19	$4,700,573	$4,803,501
3/19	$4,731,871	$4,843,816
4/19	$4,859,019	$4,945,787
5/19	$4,591,030	$4,586,914
6/19	$4,843,370	$4,873,188
7/19	$4,812,072	$4,813,599
8/19	$4,647,758	$4,578,904
9/19	$4,743,608	$4,666,314
10/19	$4,947,045	$4,863,078
11/19	$4,913,791	$4,856,386
12/19	$5,270,265	$5,218,698
1/20	$5,003,191	$4,975,431
2/20	$4,787,306	$4,713,060
3/20	$3,863,674	$3,987,142
4/20	$4,161,907	$4,352,259
5/20	$4,297,670	$4,385,688
6/20	$4,631,513	$4,708,076
7/20	$5,112,246	$5,128,798
8/20	$5,190,143	$5,242,168
9/20	$5,145,631	$5,158,087
10/20	$5,154,533	$5,264,359
11/20	$5,606,334	$5,751,246
12/20	$6,046,416	$6,174,041
1/21	$6,213,058	$6,363,323
2/21	$6,278,364	$6,411,994
3/21	$6,190,539	$6,315,156
4/21	$6,370,693	$6,472,389
5/21	$6,526,076	$6,622,486
6/21	$6,602,641	$6,633,899
7/21	$6,285,120	$6,187,448
8/21	$6,559,854	$6,349,406
9/21	$6,237,829	$6,097,077
10/21	$6,377,449	$6,157,211
11/21	$6,032,904	$5,906,285
12/21	$6,265,946	$6,017,107
1/22	$6,066,362	$5,903,210
2/22	$5,610,523	$5,726,762
3/22	$5,497,179	$5,597,419
4/22	$5,021,627	$5,286,055
5/22	$5,112,795	$5,309,328
6/22	$4,622,460	$4,956,526
7/22	$4,760,444	$4,944,350
8/22	$4,688,988	$4,964,991
9/22	$4,235,612	$4,382,934
10/22	$4,270,108	$4,246,851
11/22	$4,886,108	$4,876,735
12/22	$4,700,894	$4,808,189
1/23	$5,095,428	$5,187,851
2/23	$4,726,680	$4,851,458
3/23	$4,829,827	$4,998,395
4/23	$4,824,669	$4,941,750
5/23	$4,767,939	$4,858,747
6/23	$5,010,333	$5,043,233
7/23	$5,247,569	$5,357,181
8/23	$4,930,394	$5,027,178
9/23	$4,829,827	$4,895,706
10/23	$4,700,894	$4,705,484
11/23	$5,023,226	$5,082,064
12/23	$5,273,521	$5,280,744
1/24	$5,104,176	$5,035,540
2/24	$5,337,026	$5,275,092
3/24	$5,503,725	$5,405,807
4/24	$5,543,415	$5,429,994
5/24	$5,617,504	$5,460,664
6/24	$5,874,168	$5,676,052
7/24	$5,826,540	$5,692,944
8/24	$5,863,584	$5,784,859
9/24	$6,120,248	$6,171,144
10/24	$5,895,336	$5,896,693
11/24	$5,763,035	$5,684,823
12/24	$5,702,022	$5,677,017

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 6/15/18 (Inception)
Class IR	8.13%	1.59%	2.03%
MSCI Emerging Markets Index	7.50%	1.70%	1.96%

Performance Inception Date

Jun. 15, 2018

AssetsNet

$ 518,898,517

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 3,648,970

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$518,898,517
# of Portfolio Holdings	97
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$3,648,970

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	5.0%
Poland	2.0%
Indonesia	2.6%
South Africa	3.9%
Mexico	4.5%
Brazil	4.9%
United States	4.9%
Korea, Republic of	6.4%
Taiwan	20.1%
China	21.6%
India	24.1%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Taiwan Semiconductor Manufacturing Co. Ltd.	12.7%
Tencent Holdings Ltd.	5.1%
Mahindra & Mahindra Ltd.	2.9%
Alibaba Group Holding Ltd.	2.7%
China Construction Bank Corp.	2.3%
WEG SA	2.0%
Samsung Electronics Co. Ltd.	2.0%
Reliance Industries Ltd.	1.9%
ICICI Bank Ltd.	1.9%
State Bank of India	1.7%
Total	35.2%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000113803

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets Portfolio

Class Name

Class L

Trading Symbol

MSELX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Emerging Markets Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$192	1.85%

Expenses Paid, Amount

$ 192

Expense Ratio, Percent

1.85%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to ↑ and detractors from ↓ performance, relative to the MSCI Emerging Markets Index:

Line Graph [Table Text Block]

	Class L	MSCI Emerging Markets Index
12/14	$10,000	$10,000
1/15	$10,089	$10,060
2/15	$10,393	$10,371
3/15	$10,295	$10,224
4/15	$10,827	$11,010
5/15	$10,528	$10,569
6/15	$10,430	$10,295
7/15	$9,966	$9,581
8/15	$9,142	$8,715
9/15	$8,959	$8,452
10/15	$9,353	$9,055
11/15	$9,114	$8,702
12/15	$8,889	$8,508
1/16	$8,355	$7,956
2/16	$8,294	$7,943
3/16	$9,278	$8,994
4/16	$9,278	$9,043
5/16	$9,161	$8,706
6/16	$9,433	$9,054
7/16	$9,882	$9,509
8/16	$10,069	$9,746
9/16	$10,238	$9,871
10/16	$10,149	$9,895
11/16	$9,390	$9,439
12/16	$9,404	$9,460
1/17	$9,901	$9,978
2/17	$10,135	$10,283
3/17	$10,444	$10,543
4/17	$10,814	$10,774
5/17	$11,147	$11,092
6/17	$11,222	$11,204
7/17	$11,800	$11,872
8/17	$12,002	$12,136
9/17	$11,974	$12,088
10/17	$12,185	$12,512
11/17	$12,222	$12,537
12/17	$12,583	$12,987
1/18	$13,568	$14,069
2/18	$12,888	$13,421
3/18	$12,789	$13,171
4/18	$12,424	$13,113
5/18	$11,814	$12,648
6/18	$11,369	$12,123
7/18	$11,604	$12,389
8/18	$11,266	$12,054
9/18	$11,027	$11,990
10/18	$10,244	$10,946
11/18	$10,615	$11,397
12/18	$10,314	$11,095
1/19	$11,119	$12,066
2/19	$10,981	$12,094
3/19	$11,038	$12,195
4/19	$11,329	$12,452
5/19	$10,695	$11,548
6/19	$11,277	$12,269
7/19	$11,196	$12,119
8/19	$10,800	$11,528
9/19	$11,015	$11,748
10/19	$11,477	$12,244
11/19	$11,391	$12,227
12/19	$12,209	$13,139
1/20	$11,582	$12,526
2/20	$11,074	$11,866
3/20	$8,927	$10,038
4/20	$9,614	$10,958
5/20	$9,917	$11,042
6/20	$10,679	$11,853
7/20	$11,777	$12,913
8/20	$11,944	$13,198
9/20	$11,836	$12,986
10/20	$11,847	$13,254
11/20	$12,874	$14,480
12/20	$13,875	$15,544
1/21	$14,245	$16,021
2/21	$14,381	$16,143
3/21	$14,175	$15,899
4/21	$14,572	$16,295
5/21	$14,914	$16,673
6/21	$15,083	$16,702
7/21	$14,343	$15,578
8/21	$14,958	$15,986
9/21	$14,213	$15,350
10/21	$14,523	$15,502
11/21	$13,723	$14,870
12/21	$14,242	$15,149
1/22	$13,774	$14,862
2/22	$12,738	$14,418
3/22	$12,466	$14,092
4/22	$11,376	$13,308
5/22	$11,577	$13,367
6/22	$10,458	$12,479
7/22	$10,760	$12,448
8/22	$10,594	$12,500
9/22	$9,558	$11,035
10/22	$9,635	$10,692
11/22	$11,009	$12,278
12/22	$10,584	$12,105
1/23	$11,464	$13,061
2/23	$10,627	$12,214
3/23	$10,849	$12,584
4/23	$10,830	$12,442
5/23	$10,695	$12,233
6/23	$11,230	$12,697
7/23	$11,753	$13,488
8/23	$11,039	$12,657
9/23	$10,799	$12,326
10/23	$10,504	$11,847
11/23	$11,218	$12,795
12/23	$11,769	$13,295
1/24	$11,380	$12,678
2/24	$11,894	$13,281
3/24	$12,258	$13,610
4/24	$12,333	$13,671
5/24	$12,483	$13,748
6/24	$13,047	$14,290
7/24	$12,934	$14,333
8/24	$13,010	$14,564
9/24	$13,567	$15,537
10/24	$13,054	$14,846
11/24	$12,753	$14,312
12/24	$12,607	$14,293

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class L	7.12%	0.64%	2.34%
MSCI Emerging Markets Index	7.50%	1.70%	3.64%

AssetsNet

$ 518,898,517

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 3,648,970

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$518,898,517
# of Portfolio Holdings	97
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$3,648,970

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	5.0%
Poland	2.0%
Indonesia	2.6%
South Africa	3.9%
Mexico	4.5%
Brazil	4.9%
United States	4.9%
Korea, Republic of	6.4%
Taiwan	20.1%
China	21.6%
India	24.1%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Taiwan Semiconductor Manufacturing Co. Ltd.	12.7%
Tencent Holdings Ltd.	5.1%
Mahindra & Mahindra Ltd.	2.9%
Alibaba Group Holding Ltd.	2.7%
China Construction Bank Corp.	2.3%
WEG SA	2.0%
Samsung Electronics Co. Ltd.	2.0%
Reliance Industries Ltd.	1.9%
ICICI Bank Ltd.	1.9%
State Bank of India	1.7%
Total	35.2%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000126912

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets Portfolio

Class Name

Class R6

Trading Symbol

MMMPX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Emerging Markets Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$99	0.95%

Expenses Paid, Amount

$ 99

Expense Ratio, Percent

0.95%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to ↑ and detractors from ↓ performance, relative to the MSCI Emerging Markets Index:

Line Graph [Table Text Block]

	Class R6	MSCI Emerging Markets Index
12/14	$5,000,000	$5,000,000
1/15	$5,047,425	$5,029,973
2/15	$5,203,252	$5,185,714
3/15	$5,158,085	$5,111,971
4/15	$5,429,088	$5,505,159
5/15	$5,282,294	$5,284,697
6/15	$5,239,386	$5,147,445
7/15	$5,010,896	$4,790,630
8/15	$4,596,903	$4,357,333
9/15	$4,510,938	$4,226,247
10/15	$4,712,279	$4,527,722
11/15	$4,596,903	$4,351,106
12/15	$4,485,559	$4,254,113
1/16	$4,218,887	$3,978,131
2/16	$4,193,816	$3,971,622
3/16	$4,692,971	$4,497,176
4/16	$4,697,529	$4,521,618
5/16	$4,642,827	$4,352,952
6/16	$4,781,862	$4,526,927
7/16	$5,014,964	$4,754,730
8/16	$5,112,984	$4,872,896
9/16	$5,201,885	$4,935,554
10/16	$5,160,854	$4,947,322
11/16	$4,780,172	$4,719,592
12/16	$4,790,263	$4,730,014
1/17	$5,047,828	$4,988,854
2/17	$5,169,712	$5,141,573
3/17	$5,332,990	$5,271,364
4/17	$5,526,165	$5,386,772
5/17	$5,700,941	$5,546,028
6/17	$5,744,636	$5,601,858
7/17	$6,047,115	$5,935,782
8/17	$6,155,305	$6,068,181
9/17	$6,143,796	$6,044,053
10/17	$6,256,589	$6,255,932
11/17	$6,279,608	$6,268,490
12/17	$6,471,222	$6,493,511
1/18	$6,985,399	$7,034,718
2/18	$6,637,982	$6,710,281
3/18	$6,593,976	$6,585,515
4/18	$6,411,003	$6,556,378
5/18	$6,102,960	$6,324,059
6/18	$5,875,981	$6,061,314
7/18	$6,003,692	$6,194,464
8/18	$5,832,291	$6,026,971
9/18	$5,714,162	$5,994,984
10/18	$5,311,137	$5,472,925
11/18	$5,508,017	$5,698,463
12/18	$5,354,900	$5,547,504
1/19	$5,780,345	$6,033,229
2/19	$5,711,418	$6,046,794
3/19	$5,747,070	$6,097,543
4/19	$5,903,938	$6,225,908
5/19	$5,575,941	$5,774,147
6/19	$5,884,923	$6,134,518
7/19	$5,846,895	$6,059,506
8/19	$5,644,868	$5,764,064
9/19	$5,761,330	$5,874,099
10/19	$6,008,516	$6,121,791
11/19	$5,970,488	$6,113,367
12/19	$6,403,621	$6,569,457
1/20	$6,079,113	$6,263,224
2/20	$5,814,098	$5,932,945
3/20	$4,691,842	$5,019,136
4/20	$5,056,914	$5,478,757
5/20	$5,219,167	$5,520,838
6/20	$5,627,506	$5,926,670
7/20	$6,208,916	$6,456,288
8/20	$6,306,269	$6,599,001
9/20	$6,252,184	$6,493,158
10/20	$6,263,001	$6,626,936
11/20	$6,811,960	$7,239,845
12/20	$7,346,713	$7,772,071
1/21	$7,546,456	$8,010,346
2/21	$7,625,806	$8,071,614
3/21	$7,521,830	$7,949,712
4/21	$7,740,727	$8,147,642
5/21	$7,929,525	$8,336,588
6/21	$8,022,556	$8,350,956
7/21	$7,636,751	$7,788,949
8/21	$7,970,568	$7,992,827
9/21	$7,579,291	$7,675,186
10/21	$7,748,935	$7,750,885
11/21	$7,330,296	$7,435,012
12/21	$7,613,719	$7,574,519
1/22	$7,368,211	$7,431,141
2/22	$6,817,317	$7,209,023
3/22	$6,679,594	$7,046,202
4/22	$6,101,753	$6,654,247
5/22	$6,212,531	$6,683,545
6/22	$5,616,727	$6,239,426
7/22	$5,784,390	$6,224,099
8/22	$5,697,565	$6,250,083
9/22	$5,146,670	$5,517,372
10/22	$5,188,586	$5,346,067
11/22	$5,937,084	$6,138,983
12/22	$5,712,031	$6,052,695
1/23	$6,188,295	$6,530,625
2/23	$5,743,365	$6,107,164
3/23	$5,868,697	$6,292,133
4/23	$5,859,297	$6,220,826
5/23	$5,793,498	$6,116,340
6/23	$6,088,029	$6,348,576
7/23	$6,376,294	$6,743,784
8/23	$5,990,896	$6,328,365
9/23	$5,868,697	$6,162,864
10/23	$5,712,031	$5,923,407
11/23	$6,103,696	$6,397,458
12/23	$6,407,828	$6,647,562
1/24	$6,202,057	$6,338,891
2/24	$6,484,992	$6,640,447
3/24	$6,687,548	$6,804,995
4/24	$6,735,775	$6,835,443
5/24	$6,825,800	$6,874,051
6/24	$7,137,671	$7,145,188
7/24	$7,079,798	$7,166,452
8/24	$7,124,810	$7,282,158
9/24	$7,436,682	$7,768,424
10/24	$7,163,392	$7,422,937
11/24	$7,002,634	$7,156,230
12/24	$6,928,497	$7,146,402

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class R6	8.13%	1.59%	3.32%
MSCI Emerging Markets Index	7.50%	1.70%	3.64%

AssetsNet

$ 518,898,517

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 3,648,970

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$518,898,517
# of Portfolio Holdings	97
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$3,648,970

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	5.0%
Poland	2.0%
Indonesia	2.6%
South Africa	3.9%
Mexico	4.5%
Brazil	4.9%
United States	4.9%
Korea, Republic of	6.4%
Taiwan	20.1%
China	21.6%
India	24.1%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Taiwan Semiconductor Manufacturing Co. Ltd.	12.7%
Tencent Holdings Ltd.	5.1%
Mahindra & Mahindra Ltd.	2.9%
Alibaba Group Holding Ltd.	2.7%
China Construction Bank Corp.	2.3%
WEG SA	2.0%
Samsung Electronics Co. Ltd.	2.0%
Reliance Industries Ltd.	1.9%
ICICI Bank Ltd.	1.9%
State Bank of India	1.7%
Total	35.2%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000169209

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Concentrated Portfolio

Class Name

Class A

Trading Symbol

MLNAX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Concentrated Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$150	1.29%

Expenses Paid, Amount

$ 150

Expense Ratio, Percent

1.29%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI World Index:

↑Stock selection in and overweight to financial services sector in the U.S., including positions in a leading global financial services company and a retail insurance holding company

↑ Stock selection in an artificial intelligence chip designer and a global provider of entertainment services

↑ Stock selection in the Asia ex-Japan technology sector, led by a position in a leading semiconductor manufacturer, specializing in artificial intelligence chips

↓ Not owning the full suite of uber-growth, mega-cap technology stocks

↓Overweight to quality stocks in Asia ex-Japan

Line Graph [Table Text Block]

	Class A with maximum sales charge	MSCI World Net Index
5/16	$9,479	$10,000
5/16	$9,498	$9,992
6/16	$9,251	$9,880
7/16	$9,687	$10,297
8/16	$9,611	$10,306
9/16	$9,820	$10,361
10/16	$9,469	$10,160
11/16	$9,602	$10,306
12/16	$9,670	$10,553
1/17	$9,879	$10,808
2/17	$10,127	$11,107
3/17	$10,175	$11,226
4/17	$10,365	$11,392
5/17	$10,651	$11,633
6/17	$10,746	$11,678
7/17	$11,193	$11,957
8/17	$11,307	$11,974
9/17	$11,527	$12,243
10/17	$11,460	$12,474
11/17	$11,804	$12,744
12/17	$11,814	$12,917
1/18	$12,730	$13,599
2/18	$12,262	$13,035
3/18	$11,976	$12,751
4/18	$11,756	$12,898
5/18	$11,919	$12,979
6/18	$11,651	$12,973
7/18	$11,775	$13,378
8/18	$11,642	$13,543
9/18	$11,661	$13,619
10/18	$10,649	$12,619
11/18	$10,916	$12,762
12/18	$10,053	$11,792
1/19	$10,867	$12,709
2/19	$11,279	$13,091
3/19	$11,509	$13,263
4/19	$12,237	$13,733
5/19	$11,308	$12,941
6/19	$11,921	$13,794
7/19	$12,132	$13,862
8/19	$12,055	$13,579
9/19	$12,103	$13,868
10/19	$12,458	$14,220
11/19	$12,899	$14,616
12/19	$13,334	$15,054
1/20	$13,227	$14,963
2/20	$12,387	$13,698
3/20	$10,512	$11,885
4/20	$11,614	$13,184
5/20	$12,223	$13,820
6/20	$12,657	$14,186
7/20	$13,653	$14,865
8/20	$14,657	$15,858
9/20	$14,464	$15,311
10/20	$14,590	$14,841
11/20	$15,913	$16,739
12/20	$16,426	$17,448
1/21	$16,677	$17,275
2/21	$17,267	$17,718
3/21	$17,276	$18,307
4/21	$18,136	$19,159
5/21	$18,175	$19,435
6/21	$18,213	$19,725
7/21	$18,329	$20,078
8/21	$18,571	$20,578
9/21	$17,914	$19,723
10/21	$19,199	$20,841
11/21	$18,928	$20,384
12/21	$19,288	$21,255
1/22	$18,102	$20,130
2/22	$17,158	$19,621
3/22	$17,067	$20,160
4/22	$15,681	$18,485
5/22	$15,621	$18,499
6/22	$14,456	$16,897
7/22	$15,812	$18,238
8/22	$15,119	$17,476
9/22	$13,923	$15,851
10/22	$13,813	$16,989
11/22	$15,571	$18,171
12/22	$14,949	$17,399
1/23	$16,788	$18,630
2/23	$16,255	$18,182
3/23	$15,884	$18,744
4/23	$15,823	$19,073
5/23	$15,472	$18,882
6/23	$16,919	$20,024
7/23	$17,180	$20,697
8/23	$16,456	$20,203
9/23	$15,612	$19,331
10/23	$15,432	$18,770
11/23	$17,089	$20,530
12/23	$17,647	$21,538
1/24	$18,738	$21,796
2/24	$20,728	$22,720
3/24	$21,557	$23,450
4/24	$20,637	$22,579
5/24	$22,052	$23,588
6/24	$22,436	$24,068
7/24	$22,052	$24,492
8/24	$23,284	$25,139
9/24	$23,213	$25,599
10/24	$23,466	$25,092
11/24	$24,587	$26,243
12/24	$23,385	$25,559

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 5/27/16 (Inception)
Class A	32.51%	11.89%	11.08%
Class A, with 5.25% maximum front end sales charge	25.54%	10.70%	10.39%
MSCI World Net Index	18.67%	11.17%	11.53%

Performance Inception Date

May 27, 2016

AssetsNet

$ 226,121,751

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 1,247,474

InvestmentCompanyPortfolioTurnover

43.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$226,121,751
# of Portfolio Holdings	21
Portfolio Turnover Rate	43%
Total Advisory Fees Paid	$1,247,474

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.0%
Utilities	1.8%
Health Care	2.4%
Real Estate	3.6%
Consumer Discretionary	5.6%
Consumer Staples	6.2%
Materials	7.0%
Communication Services	10.6%
Industrials	12.0%
Information Technology	24.0%
Financials	25.8%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

NVIDIA Corp.	10.1%
Microsoft Corp.	7.2%
CRH PLC	7.0%
Progressive Corp.	6.9%
Taiwan Semiconductor Manufacturing Co. Ltd.	6.8%
Costco Wholesale Corp.	6.2%
Netflix, Inc.	5.7%
Ferrari NV	5.6%
Ameriprise Financial, Inc.	5.4%
JPMorgan Chase & Co.	5.2%
Total	66.1%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000169210

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Concentrated Portfolio

Class Name

Class C

Trading Symbol

MLNCX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Concentrated Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$238	2.06%

Expenses Paid, Amount

$ 238

Expense Ratio, Percent

2.06%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI World Index:

↑Stock selection in and overweight to financial services sector in the U.S., including positions in a leading global financial services company and a retail insurance holding company

↑ Stock selection in an artificial intelligence chip designer and a global provider of entertainment services

↑ Stock selection in the Asia ex-Japan technology sector, led by a position in a leading semiconductor manufacturer, specializing in artificial intelligence chips

↓ Not owning the full suite of uber-growth, mega-cap technology stocks

↓Overweight to quality stocks in Asia ex-Japan

Line Graph [Table Text Block]

	Class C	MSCI World Net Index
5/16	$10,000	$10,000
5/16	$10,020	$9,992
6/16	$9,750	$9,880
7/16	$10,210	$10,297
8/16	$10,120	$10,306
9/16	$10,340	$10,361
10/16	$9,970	$10,160
11/16	$10,100	$10,306
12/16	$10,169	$10,553
1/17	$10,380	$10,808
2/17	$10,630	$11,107
3/17	$10,680	$11,226
4/17	$10,861	$11,392
5/17	$11,161	$11,633
6/17	$11,251	$11,678
7/17	$11,711	$11,957
8/17	$11,822	$11,974
9/17	$12,043	$12,243
10/17	$11,972	$12,474
11/17	$12,324	$12,744
12/17	$12,324	$12,917
1/18	$13,268	$13,599
2/18	$12,776	$13,035
3/18	$12,474	$12,751
4/18	$12,233	$12,898
5/18	$12,394	$12,979
6/18	$12,103	$12,973
7/18	$12,233	$13,378
8/18	$12,083	$13,543
9/18	$12,093	$13,619
10/18	$11,038	$12,619
11/18	$11,309	$12,762
12/18	$10,405	$11,792
1/19	$11,239	$12,709
2/19	$11,661	$13,091
3/19	$11,892	$13,263
4/19	$12,635	$13,733
5/19	$11,671	$12,941
6/19	$12,294	$13,794
7/19	$12,505	$13,862
8/19	$12,424	$13,579
9/19	$12,454	$13,868
10/19	$12,816	$14,220
11/19	$13,258	$14,616
12/19	$13,703	$15,054
1/20	$13,583	$14,963
2/20	$12,718	$13,698
3/20	$10,778	$11,885
4/20	$11,914	$13,184
5/20	$12,527	$13,820
6/20	$12,959	$14,186
7/20	$13,975	$14,865
8/20	$14,980	$15,858
9/20	$14,779	$15,311
10/20	$14,890	$14,841
11/20	$16,237	$16,739
12/20	$16,750	$17,448
1/21	$16,991	$17,275
2/21	$17,585	$17,718
3/21	$17,585	$18,307
4/21	$18,449	$19,159
5/21	$18,479	$19,435
6/21	$18,499	$19,725
7/21	$18,610	$20,078
8/21	$18,841	$20,578
9/21	$18,168	$19,723
10/21	$19,455	$20,841
11/21	$19,173	$20,384
12/21	$19,527	$21,255
1/22	$18,313	$20,130
2/22	$17,339	$19,621
3/22	$17,245	$20,160
4/22	$15,822	$18,485
5/22	$15,759	$18,499
6/22	$14,577	$16,897
7/22	$15,937	$18,238
8/22	$15,226	$17,476
9/22	$14,012	$15,851
10/22	$13,897	$16,989
11/22	$15,655	$18,171
12/22	$15,018	$17,399
1/23	$16,860	$18,630
2/23	$16,316	$18,182
3/23	$15,928	$18,744
4/23	$15,855	$19,073
5/23	$15,489	$18,882
6/23	$16,933	$20,024
7/23	$17,184	$20,697
8/23	$16,452	$20,203
9/23	$15,594	$19,331
10/23	$15,405	$18,770
11/23	$17,048	$20,530
12/23	$17,603	$21,538
1/24	$18,670	$21,796
2/24	$20,638	$22,720
3/24	$21,454	$23,450
4/24	$20,523	$22,579
5/24	$21,918	$23,588
6/24	$22,300	$24,068
7/24	$21,918	$24,492
8/24	$23,143	$25,139
9/24	$23,073	$25,599
10/24	$23,324	$25,092
11/24	$24,438	$26,243
12/24	$23,243	$25,559

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 5/27/16 (Inception)
Class C, with conversion to Class A after 8 years	31.45%	11.05%	10.31%
Class C, with 1% maximum contingent deferred sales charge and conversion to Class A after 8 years	30.45%	11.05%	10.31%
MSCI World Net Index	18.67%	11.17%	11.53%

Performance Inception Date

May 27, 2016

AssetsNet

$ 226,121,751

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 1,247,474

InvestmentCompanyPortfolioTurnover

43.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$226,121,751
# of Portfolio Holdings	21
Portfolio Turnover Rate	43%
Total Advisory Fees Paid	$1,247,474

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.0%
Utilities	1.8%
Health Care	2.4%
Real Estate	3.6%
Consumer Discretionary	5.6%
Consumer Staples	6.2%
Materials	7.0%
Communication Services	10.6%
Industrials	12.0%
Information Technology	24.0%
Financials	25.8%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

NVIDIA Corp.	10.1%
Microsoft Corp.	7.2%
CRH PLC	7.0%
Progressive Corp.	6.9%
Taiwan Semiconductor Manufacturing Co. Ltd.	6.8%
Costco Wholesale Corp.	6.2%
Netflix, Inc.	5.7%
Ferrari NV	5.6%
Ameriprise Financial, Inc.	5.4%
JPMorgan Chase & Co.	5.2%
Total	66.1%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000169208

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Concentrated Portfolio

Class Name

Class I

Trading Symbol

MLNIX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Concentrated Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$116	1.00%

Expenses Paid, Amount

$ 116

Expense Ratio, Percent

1.00%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI World Index:

↑Stock selection in and overweight to financial services sector in the U.S., including positions in a leading global financial services company and a retail insurance holding company

↑ Stock selection in an artificial intelligence chip designer and a global provider of entertainment services

↑ Stock selection in the Asia ex-Japan technology sector, led by a position in a leading semiconductor manufacturer, specializing in artificial intelligence chips

↓ Not owning the full suite of uber-growth, mega-cap technology stocks

↓Overweight to quality stocks in Asia ex-Japan

Line Graph [Table Text Block]

	Class I	MSCI World Net Index
5/16	$1,000,000	$1,000,000
5/16	$1,002,000	$1,000,000
6/16	$976,000	$988,002
7/16	$1,023,000	$1,029,744
8/16	$1,015,000	$1,030,600
9/16	$1,038,000	$1,036,074
10/16	$1,001,000	$1,016,023
11/16	$1,015,000	$1,030,632
12/16	$1,022,399	$1,055,294
1/17	$1,044,538	$1,080,763
2/17	$1,071,708	$1,110,748
3/17	$1,077,746	$1,122,579
4/17	$1,096,865	$1,139,201
5/17	$1,128,060	$1,163,300
6/17	$1,138,123	$1,167,776
7/17	$1,186,304	$1,195,724
8/17	$1,198,409	$1,197,408
9/17	$1,221,611	$1,224,282
10/17	$1,215,558	$1,247,419
11/17	$1,252,883	$1,274,448
12/17	$1,253,859	$1,291,683
1/18	$1,351,785	$1,359,884
2/18	$1,302,317	$1,303,548
3/18	$1,273,041	$1,275,135
4/18	$1,248,811	$1,289,788
5/18	$1,266,983	$1,297,870
6/18	$1,238,716	$1,297,251
7/18	$1,251,840	$1,337,769
8/18	$1,238,716	$1,354,321
9/18	$1,240,735	$1,361,862
10/18	$1,133,723	$1,261,863
11/18	$1,163,000	$1,276,198
12/18	$1,070,725	$1,179,158
1/19	$1,157,156	$1,270,904
2/19	$1,201,897	$1,309,119
3/19	$1,227,318	$1,326,314
4/19	$1,304,597	$1,373,344
5/19	$1,205,964	$1,294,101
6/19	$1,272,058	$1,379,376
7/19	$1,294,428	$1,386,208
8/19	$1,287,311	$1,357,854
9/19	$1,292,395	$1,386,750
10/19	$1,330,018	$1,422,040
11/19	$1,377,809	$1,461,644
12/19	$1,425,168	$1,505,432
1/20	$1,413,857	$1,496,269
2/20	$1,325,427	$1,369,796
3/20	$1,123,888	$1,188,514
4/20	$1,243,166	$1,318,352
5/20	$1,307,946	$1,382,039
6/20	$1,355,246	$1,418,596
7/20	$1,462,185	$1,486,463
8/20	$1,569,124	$1,585,780
9/20	$1,549,587	$1,531,072
10/20	$1,562,955	$1,484,107
11/20	$1,705,883	$1,673,867
12/20	$1,760,423	$1,744,833
1/21	$1,788,187	$1,727,492
2/21	$1,851,940	$1,771,758
3/21	$1,853,997	$1,830,708
4/21	$1,946,542	$1,915,909
5/21	$1,950,656	$1,943,509
6/21	$1,954,769	$1,972,476
7/21	$1,968,136	$2,007,809
8/21	$1,994,872	$2,057,780
9/21	$1,924,948	$1,972,340
10/21	$2,062,739	$2,084,054
11/21	$2,034,975	$2,038,387
12/21	$2,074,230	$2,125,508
1/22	$1,947,062	$2,013,045
2/22	$1,845,541	$1,962,133
3/22	$1,835,924	$2,015,980
4/22	$1,687,383	$1,848,506
5/22	$1,682,039	$1,849,906
6/22	$1,555,940	$1,689,663
7/22	$1,703,412	$1,823,816
8/22	$1,628,607	$1,747,567
9/22	$1,500,371	$1,585,113
10/22	$1,488,616	$1,698,945
11/22	$1,678,834	$1,817,073
12/22	$1,612,075	$1,739,907
1/23	$1,811,440	$1,863,016
2/23	$1,753,560	$1,818,232
3/23	$1,713,901	$1,874,414
4/23	$1,708,542	$1,907,272
5/23	$1,669,955	$1,888,231
6/23	$1,827,518	$2,002,427
7/23	$1,855,387	$2,069,694
8/23	$1,778,213	$2,020,258
9/23	$1,687,105	$1,933,107
10/23	$1,667,811	$1,877,017
11/23	$1,848,955	$2,052,991
12/23	$1,909,050	$2,153,781
1/24	$2,026,813	$2,179,627
2/24	$2,242,891	$2,272,038
3/24	$2,333,644	$2,345,050
4/24	$2,234,248	$2,257,944
5/24	$2,388,744	$2,358,766
6/24	$2,430,879	$2,406,761
7/24	$2,388,744	$2,449,174
8/24	$2,523,792	$2,513,907
9/24	$2,516,230	$2,559,947
10/24	$2,544,320	$2,509,165
11/24	$2,666,404	$2,624,302
12/24	$2,537,226	$2,555,912

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 5/27/16 (Inception)
Class I	32.91%	12.23%	11.44%
MSCI World Net Index	18.67%	11.17%	11.53%

Performance Inception Date

May 27, 2016

AssetsNet

$ 226,121,751

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 1,247,474

InvestmentCompanyPortfolioTurnover

43.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$226,121,751
# of Portfolio Holdings	21
Portfolio Turnover Rate	43%
Total Advisory Fees Paid	$1,247,474

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.0%
Utilities	1.8%
Health Care	2.4%
Real Estate	3.6%
Consumer Discretionary	5.6%
Consumer Staples	6.2%
Materials	7.0%
Communication Services	10.6%
Industrials	12.0%
Information Technology	24.0%
Financials	25.8%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

NVIDIA Corp.	10.1%
Microsoft Corp.	7.2%
CRH PLC	7.0%
Progressive Corp.	6.9%
Taiwan Semiconductor Manufacturing Co. Ltd.	6.8%
Costco Wholesale Corp.	6.2%
Netflix, Inc.	5.7%
Ferrari NV	5.6%
Ameriprise Financial, Inc.	5.4%
JPMorgan Chase & Co.	5.2%
Total	66.1%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000169211

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Concentrated Portfolio

Class Name

Class R6

Trading Symbol

MLNSX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Concentrated Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$111	0.95%

Expenses Paid, Amount

$ 111

Expense Ratio, Percent

0.95%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI World Index:

↑Stock selection in and overweight to financial services sector in the U.S., including positions in a leading global financial services company and a retail insurance holding company

↑ Stock selection in an artificial intelligence chip designer and a global provider of entertainment services

↑ Stock selection in the Asia ex-Japan technology sector, led by a position in a leading semiconductor manufacturer, specializing in artificial intelligence chips

↓ Not owning the full suite of uber-growth, mega-cap technology stocks

↓Overweight to quality stocks in Asia ex-Japan

Line Graph [Table Text Block]

	Class R6	MSCI World Net Index
5/16	$5,000,000	$5,000,000
5/16	$5,010,000	$5,000,000
6/16	$4,880,000	$4,940,011
7/16	$5,115,000	$5,148,719
8/16	$5,075,000	$5,152,998
9/16	$5,190,000	$5,180,370
10/16	$5,005,000	$5,080,115
11/16	$5,075,000	$5,153,162
12/16	$5,112,674	$5,276,469
1/17	$5,223,382	$5,403,817
2/17	$5,359,250	$5,553,738
3/17	$5,389,443	$5,612,896
4/17	$5,490,086	$5,696,005
5/17	$5,646,083	$5,816,501
6/17	$5,696,405	$5,838,880
7/17	$5,932,309	$5,978,619
8/17	$5,992,843	$5,987,038
9/17	$6,113,911	$6,121,412
10/17	$6,083,644	$6,237,097
11/17	$6,265,245	$6,372,240
12/17	$6,271,615	$6,458,415
1/18	$6,761,427	$6,799,421
2/18	$6,519,045	$6,517,738
3/18	$6,367,557	$6,375,674
4/18	$6,251,416	$6,448,938
5/18	$6,337,259	$6,489,350
6/18	$6,195,870	$6,486,254
7/18	$6,266,565	$6,688,843
8/18	$6,200,920	$6,771,603
9/18	$6,211,019	$6,809,309
10/18	$5,675,761	$6,309,315
11/18	$5,817,150	$6,380,989
12/18	$5,359,273	$5,895,791
1/19	$5,791,883	$6,354,518
2/19	$6,015,822	$6,545,597
3/19	$6,143,061	$6,631,570
4/19	$6,529,865	$6,866,721
5/19	$6,041,270	$6,470,505
6/19	$6,367,000	$6,896,878
7/19	$6,484,059	$6,931,041
8/19	$6,443,343	$6,789,270
9/19	$6,468,791	$6,933,752
10/19	$6,662,193	$7,110,199
11/19	$6,901,400	$7,308,219
12/19	$7,136,505	$7,527,160
1/20	$7,079,866	$7,481,345
2/20	$6,637,053	$6,848,982
3/20	$5,627,850	$5,942,569
4/20	$6,225,133	$6,591,761
5/20	$6,554,669	$6,910,197
6/20	$6,786,374	$7,092,979
7/20	$7,327,018	$7,432,316
8/20	$7,862,513	$7,928,902
9/20	$7,764,682	$7,655,362
10/20	$7,831,619	$7,420,533
11/20	$8,547,329	$8,369,334
12/20	$8,825,587	$8,724,166
1/21	$8,964,613	$8,637,460
2/21	$9,283,859	$8,858,789
3/21	$9,294,157	$9,153,540
4/21	$9,757,577	$9,579,546
5/21	$9,778,174	$9,717,544
6/21	$9,803,919	$9,862,382
7/21	$9,870,858	$10,039,045
8/21	$9,999,586	$10,288,901
9/21	$9,649,446	$9,861,700
10/21	$10,344,577	$10,420,272
11/21	$10,200,401	$10,191,933
12/21	$10,402,101	$10,627,538
1/22	$9,765,347	$10,065,225
2/22	$9,251,663	$9,810,664
3/22	$9,208,856	$10,079,901
4/22	$8,459,734	$9,242,530
5/22	$8,432,979	$9,249,530
6/22	$7,806,927	$8,448,317
7/22	$8,545,348	$9,119,082
8/22	$8,165,435	$8,737,834
9/22	$7,528,681	$7,925,565
10/22	$7,469,822	$8,494,723
11/22	$8,422,277	$9,085,365
12/22	$8,087,140	$8,699,534
1/23	$9,085,950	$9,315,079
2/23	$8,801,343	$9,091,158
3/23	$8,602,655	$9,372,072
4/23	$8,570,435	$9,536,361
5/23	$8,377,117	$9,441,156
6/23	$9,166,500	$10,012,136
7/23	$9,311,488	$10,348,471
8/23	$8,924,852	$10,101,290
9/23	$8,468,406	$9,665,537
10/23	$8,371,747	$9,385,083
11/23	$9,279,268	$10,264,954
12/23	$9,584,242	$10,768,905
1/24	$10,174,458	$10,898,137
2/24	$11,257,423	$11,360,192
3/24	$11,712,269	$11,725,250
4/24	$11,214,105	$11,289,719
5/24	$11,993,840	$11,793,828
6/24	$12,205,018	$12,033,807
7/24	$11,993,840	$12,245,872
8/24	$12,670,693	$12,569,536
9/24	$12,638,204	$12,799,734
10/24	$12,773,575	$12,545,827
11/24	$13,385,450	$13,121,512
12/24	$12,737,544	$12,779,558

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 5/27/16 (Inception)
Class R6	32.90%	12.28%	11.49%
MSCI World Net Index	18.67%	11.17%	11.53%

Performance Inception Date

May 27, 2016

AssetsNet

$ 226,121,751

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 1,247,474

InvestmentCompanyPortfolioTurnover

43.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$226,121,751
# of Portfolio Holdings	21
Portfolio Turnover Rate	43%
Total Advisory Fees Paid	$1,247,474

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.0%
Utilities	1.8%
Health Care	2.4%
Real Estate	3.6%
Consumer Discretionary	5.6%
Consumer Staples	6.2%
Materials	7.0%
Communication Services	10.6%
Industrials	12.0%
Information Technology	24.0%
Financials	25.8%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

NVIDIA Corp.	10.1%
Microsoft Corp.	7.2%
CRH PLC	7.0%
Progressive Corp.	6.9%
Taiwan Semiconductor Manufacturing Co. Ltd.	6.8%
Costco Wholesale Corp.	6.2%
Netflix, Inc.	5.7%
Ferrari NV	5.6%
Ameriprise Financial, Inc.	5.4%
JPMorgan Chase & Co.	5.2%
Total	66.1%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000169213

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Core Portfolio

Class Name

Class A

Trading Symbol

MLMAX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Core Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$145	1.30%

Expenses Paid, Amount

$ 145

Expense Ratio, Percent

1.30%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI World Index:

↑ Stock selection in and overweight to the financial services sector in the U.S., including positions in a leading global financial services company and a financial services company specializing in retail wealth management

↑ Stock selection in an artificial intelligence chip designer and a global provider of entertainment services

↑ Underweight to health care stocks in the U.S.

↑ Stock selection in the Asia ex-Japan technology sector

↓ Overweight to quality stocks in Asia ex-Japan

Line Graph [Table Text Block]

	Class A with maximum sales charge	MSCI World Net Index
5/16	$9,479	$10,000
5/16	$9,469	$9,992
6/16	$9,213	$9,880
7/16	$9,640	$10,297
8/16	$9,602	$10,306
9/16	$9,716	$10,361
10/16	$9,384	$10,160
11/16	$9,488	$10,306
12/16	$9,558	$10,553
1/17	$9,758	$10,808
2/17	$10,082	$11,107
3/17	$10,111	$11,226
4/17	$10,273	$11,392
5/17	$10,540	$11,633
6/17	$10,578	$11,678
7/17	$10,895	$11,957
8/17	$10,933	$11,974
9/17	$11,047	$12,243
10/17	$11,334	$12,474
11/17	$11,677	$12,744
12/17	$11,643	$12,917
1/18	$12,408	$13,599
2/18	$11,920	$13,035
3/18	$11,519	$12,751
4/18	$11,280	$12,898
5/18	$11,385	$12,979
6/18	$11,232	$12,973
7/18	$11,490	$13,378
8/18	$11,547	$13,543
9/18	$11,557	$13,619
10/18	$10,534	$12,619
11/18	$10,649	$12,762
12/18	$9,732	$11,792
1/19	$10,556	$12,709
2/19	$10,854	$13,091
3/19	$11,017	$13,263
4/19	$11,707	$13,733
5/19	$10,863	$12,941
6/19	$11,486	$13,794
7/19	$11,592	$13,862
8/19	$11,410	$13,579
9/19	$11,554	$13,868
10/19	$11,880	$14,220
11/19	$12,311	$14,616
12/19	$12,686	$15,054
1/20	$12,706	$14,963
2/20	$11,656	$13,698
3/20	$9,835	$11,885
4/20	$10,846	$13,184
5/20	$11,521	$13,820
6/20	$12,012	$14,186
7/20	$12,956	$14,865
8/20	$13,967	$15,858
9/20	$13,611	$15,311
10/20	$13,515	$14,841
11/20	$14,728	$16,739
12/20	$15,335	$17,448
1/21	$15,432	$17,275
2/21	$15,923	$17,718
3/21	$15,933	$18,307
4/21	$16,780	$19,159
5/21	$16,896	$19,435
6/21	$17,031	$19,725
7/21	$17,146	$20,078
8/21	$17,377	$20,578
9/21	$16,722	$19,723
10/21	$17,936	$20,841
11/21	$17,541	$20,384
12/21	$17,963	$21,255
1/22	$17,058	$20,130
2/22	$16,283	$19,621
3/22	$16,313	$20,160
4/22	$15,216	$18,485
5/22	$15,085	$18,499
6/22	$13,797	$16,897
7/22	$15,125	$18,238
8/22	$14,471	$17,476
9/22	$13,203	$15,851
10/22	$13,747	$16,989
11/22	$15,065	$18,171
12/22	$14,435	$17,399
1/23	$15,815	$18,630
2/23	$15,342	$18,182
3/23	$15,352	$18,744
4/23	$15,493	$19,073
5/23	$14,979	$18,882
6/23	$16,289	$20,024
7/23	$16,631	$20,697
8/23	$16,037	$20,203
9/23	$15,160	$19,331
10/23	$14,828	$18,770
11/23	$16,379	$20,530
12/23	$16,978	$21,538
1/24	$17,423	$21,796
2/24	$18,810	$22,720
3/24	$19,457	$23,450
4/24	$18,557	$22,579
5/24	$19,457	$23,588
6/24	$19,852	$24,068
7/24	$19,923	$24,492
8/24	$20,631	$25,139
9/24	$20,752	$25,599
10/24	$20,783	$25,092
11/24	$21,794	$26,243
12/24	$20,975	$25,559

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 5/27/16 (Inception)
Class A	23.54%	10.58%	9.68%
Class A, with 5.25% maximum front end sales charge	17.05%	9.39%	9.00%
MSCI World Net Index	18.67%	11.17%	11.53%

Performance Inception Date

May 27, 2016

AssetsNet

$ 36,769,314

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 9,576

InvestmentCompanyPortfolioTurnover

39.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$36,769,314
# of Portfolio Holdings	47
Portfolio Turnover Rate	39%
Total Advisory Fees Paid	$9,576

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Health Care	0.4%
Short-Term Investments	0.7%
Consumer Staples	0.9%
Utilities	1.1%
Energy	1.7%
Real Estate	2.0%
Industrials	8.0%
Materials	8.2%
Communication Services	10.5%
Consumer Discretionary	17.6%
Information Technology	23.9%
Financials	25.0%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

CRH PLC	6.7%
NVIDIA Corp.	6.2%
Apple, Inc.	5.6%
Ameriprise Financial, Inc.	5.5%
Ferrari NV	5.5%
JPMorgan Chase & Co.	5.4%
Microsoft Corp.	5.4%
Taiwan Semiconductor Manufacturing Co. Ltd.	4.6%
Amazon.com, Inc.	4.6%
TJX Cos., Inc.	4.0%
Total	53.5%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000169214

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Core Portfolio

Class Name

Class C

Trading Symbol

MLMCX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Core Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$234	2.10%

Expenses Paid, Amount

$ 234

Expense Ratio, Percent

2.10%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI World Index:

↑ Stock selection in an artificial intelligence chip designer and a global provider of entertainment services

↑ Underweight to health care stocks in the U.S.

↑ Stock selection in the Asia ex-Japan technology sector

↓ Overweight to quality stocks in Asia ex-Japan

Line Graph [Table Text Block]

	Class C	MSCI World Net Index
5/16	$10,000	$10,000
5/16	$9,990	$9,992
6/16	$9,720	$9,880
7/16	$10,160	$10,297
8/16	$10,110	$10,306
9/16	$10,230	$10,361
10/16	$9,870	$10,160
11/16	$9,980	$10,306
12/16	$10,041	$10,553
1/17	$10,251	$10,808
2/17	$10,583	$11,107
3/17	$10,603	$11,226
4/17	$10,764	$11,392
5/17	$11,045	$11,633
6/17	$11,065	$11,678
7/17	$11,398	$11,957
8/17	$11,428	$11,974
9/17	$11,548	$12,243
10/17	$11,830	$12,474
11/17	$12,181	$12,744
12/17	$12,141	$12,917
1/18	$12,925	$13,599
2/18	$12,413	$13,035
3/18	$11,990	$12,751
4/18	$11,739	$12,898
5/18	$11,830	$12,979
6/18	$11,669	$12,973
7/18	$11,920	$13,378
8/18	$11,980	$13,543
9/18	$11,980	$13,619
10/18	$10,915	$12,619
11/18	$11,026	$12,762
12/18	$10,071	$11,792
1/19	$10,915	$12,709
2/19	$11,217	$13,091
3/19	$11,377	$13,263
4/19	$12,081	$13,733
5/19	$11,207	$12,941
6/19	$11,840	$13,794
7/19	$11,950	$13,862
8/19	$11,749	$13,579
9/19	$11,890	$13,868
10/19	$12,222	$14,220
11/19	$12,644	$14,616
12/19	$13,036	$15,054
1/20	$13,046	$14,963
2/20	$11,960	$13,698
3/20	$10,081	$11,885
4/20	$11,106	$13,184
5/20	$11,789	$13,820
6/20	$12,292	$14,186
7/20	$13,247	$14,865
8/20	$14,272	$15,858
9/20	$13,900	$15,311
10/20	$13,800	$14,841
11/20	$15,026	$16,739
12/20	$15,629	$17,448
1/21	$15,729	$17,275
2/21	$16,212	$17,718
3/21	$16,212	$18,307
4/21	$17,066	$19,159
5/21	$17,177	$19,435
6/21	$17,297	$19,725
7/21	$17,398	$20,078
8/21	$17,619	$20,578
9/21	$16,956	$19,723
10/21	$18,172	$20,841
11/21	$17,760	$20,384
12/21	$18,180	$21,255
1/22	$17,244	$20,130
2/22	$16,456	$19,621
3/22	$16,477	$20,160
4/22	$15,352	$18,485
5/22	$15,215	$18,499
6/22	$13,900	$16,897
7/22	$15,236	$18,238
8/22	$14,573	$17,476
9/22	$13,280	$15,851
10/22	$13,816	$16,989
11/22	$15,141	$18,171
12/22	$14,500	$17,399
1/23	$15,867	$18,630
2/23	$15,394	$18,182
3/23	$15,383	$18,744
4/23	$15,509	$19,073
5/23	$14,994	$18,882
6/23	$16,298	$20,024
7/23	$16,634	$20,697
8/23	$16,014	$20,203
9/23	$15,131	$19,331
10/23	$14,805	$18,770
11/23	$16,329	$20,530
12/23	$16,918	$21,538
1/24	$17,349	$21,796
2/24	$18,727	$22,720
3/24	$19,347	$23,450
4/24	$18,443	$22,579
5/24	$19,332	$23,588
6/24	$19,724	$24,068
7/24	$19,795	$24,492
8/24	$20,498	$25,139
9/24	$20,619	$25,599
10/24	$20,649	$25,092
11/24	$21,654	$26,243
12/24	$20,840	$25,559

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 5/27/16 (Inception)
Class C, with conversion to Class A after 8 years	22.62%	9.74%	8.92%
Class C, with 1% maximum contingent deferred sales charge and conversion to Class A after 8 years	21.62%	9.74%	8.92%
MSCI World Net Index	18.67%	11.17%	11.53%

Performance Inception Date

May 27, 2016

AssetsNet

$ 36,769,314

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 9,576

InvestmentCompanyPortfolioTurnover

39.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$36,769,314
# of Portfolio Holdings	47
Portfolio Turnover Rate	39%
Total Advisory Fees Paid	$9,576

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Health Care	0.4%
Short-Term Investments	0.7%
Consumer Staples	0.9%
Utilities	1.1%
Energy	1.7%
Real Estate	2.0%
Industrials	8.0%
Materials	8.2%
Communication Services	10.5%
Consumer Discretionary	17.6%
Information Technology	23.9%
Financials	25.0%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

CRH PLC	6.7%
NVIDIA Corp.	6.2%
Apple, Inc.	5.6%
Ameriprise Financial, Inc.	5.5%
Ferrari NV	5.5%
JPMorgan Chase & Co.	5.4%
Microsoft Corp.	5.4%
Taiwan Semiconductor Manufacturing Co. Ltd.	4.6%
Amazon.com, Inc.	4.6%
TJX Cos., Inc.	4.0%
Total	53.5%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000169212

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Core Portfolio

Class Name

Class I

Trading Symbol

MLMIX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Core Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$112	1.00%

Expenses Paid, Amount

$ 112

Expense Ratio, Percent

1.00%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI World Index:

↑ Stock selection in an artificial intelligence chip designer and a global provider of entertainment services

↑ Underweight to health care stocks in the U.S.

↑ Stock selection in the Asia ex-Japan technology sector

↓ Overweight to quality stocks in Asia ex-Japan

Line Graph [Table Text Block]

	Class I	MSCI World Net Index
5/16	$1,000,000	$1,000,000
5/16	$1,000,000	$1,000,000
6/16	$973,000	$988,002
7/16	$1,018,000	$1,029,744
8/16	$1,014,000	$1,030,600
9/16	$1,027,000	$1,036,074
10/16	$992,000	$1,016,023
11/16	$1,003,000	$1,030,632
12/16	$1,010,838	$1,055,294
1/17	$1,033,010	$1,080,763
2/17	$1,067,275	$1,110,748
3/17	$1,070,299	$1,122,579
4/17	$1,088,439	$1,139,201
5/17	$1,116,658	$1,163,300
6/17	$1,120,689	$1,167,776
7/17	$1,155,096	$1,195,724
8/17	$1,159,132	$1,197,408
9/17	$1,172,246	$1,224,282
10/17	$1,202,511	$1,247,419
11/17	$1,238,828	$1,274,448
12/17	$1,235,936	$1,291,683
1/18	$1,316,981	$1,359,884
2/18	$1,266,328	$1,303,548
3/18	$1,224,792	$1,275,135
4/18	$1,199,466	$1,289,788
5/18	$1,210,609	$1,297,870
6/18	$1,194,400	$1,297,251
7/18	$1,221,753	$1,337,769
8/18	$1,228,844	$1,354,321
9/18	$1,229,858	$1,361,862
10/18	$1,121,460	$1,261,863
11/18	$1,134,630	$1,276,198
12/18	$1,036,291	$1,179,158
1/19	$1,125,116	$1,270,904
2/19	$1,156,766	$1,309,119
3/19	$1,174,122	$1,326,314
4/19	$1,248,654	$1,373,344
5/19	$1,158,808	$1,294,101
6/19	$1,226,192	$1,379,376
7/19	$1,237,423	$1,386,208
8/19	$1,219,045	$1,357,854
9/19	$1,234,360	$1,386,750
10/19	$1,269,073	$1,422,040
11/19	$1,316,038	$1,461,644
12/19	$1,357,113	$1,505,432
1/20	$1,359,170	$1,496,269
2/20	$1,247,021	$1,369,796
3/20	$1,052,560	$1,188,514
4/20	$1,160,594	$1,318,352
5/20	$1,233,645	$1,382,039
6/20	$1,287,148	$1,418,596
7/20	$1,387,979	$1,486,463
8/20	$1,497,042	$1,585,780
9/20	$1,458,973	$1,531,072
10/20	$1,449,713	$1,484,107
11/20	$1,580,383	$1,673,867
12/20	$1,645,203	$1,744,833
1/21	$1,656,521	$1,727,492
2/21	$1,710,024	$1,771,758
3/21	$1,711,052	$1,830,708
4/21	$1,802,624	$1,915,909
5/21	$1,816,000	$1,943,509
6/21	$1,831,433	$1,972,476
7/21	$1,843,780	$2,007,809
8/21	$1,869,502	$2,057,780
9/21	$1,799,537	$1,972,340
10/21	$1,931,236	$2,084,054
11/21	$1,889,051	$2,038,387
12/21	$1,935,201	$2,125,508
1/22	$1,837,420	$2,013,045
2/22	$1,754,682	$1,962,133
3/22	$1,758,981	$2,015,980
4/22	$1,640,784	$1,848,506
5/22	$1,626,815	$1,849,906
6/22	$1,488,203	$1,689,663
7/22	$1,632,188	$1,823,816
8/22	$1,562,344	$1,747,567
9/22	$1,425,881	$1,585,113
10/22	$1,484,979	$1,698,945
11/22	$1,627,890	$1,817,073
12/22	$1,560,364	$1,739,907
1/23	$1,710,254	$1,863,016
2/23	$1,659,572	$1,818,232
3/23	$1,660,650	$1,874,415
4/23	$1,675,747	$1,907,272
5/23	$1,621,830	$1,888,231
6/23	$1,764,171	$2,002,427
7/23	$1,801,913	$2,069,694
8/23	$1,737,213	$2,020,258
9/23	$1,642,318	$1,933,107
10/23	$1,607,811	$1,877,017
11/23	$1,776,033	$2,052,991
12/23	$1,840,657	$2,153,781
1/24	$1,889,524	$2,179,627
2/24	$2,041,554	$2,272,038
3/24	$2,111,054	$2,345,050
4/24	$2,014,406	$2,257,944
5/24	$2,113,226	$2,358,765
6/24	$2,155,577	$2,406,761
7/24	$2,164,265	$2,449,174
8/24	$2,242,452	$2,513,907
9/24	$2,255,483	$2,559,947
10/24	$2,259,827	$2,509,165
11/24	$2,369,506	$2,624,302
12/24	$2,282,092	$2,555,912

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 5/27/16 (Inception)
Class I	23.98%	10.95%	10.07%
MSCI World Net Index	18.67%	11.17%	11.53%

Performance Inception Date

May 27, 2016

AssetsNet

$ 36,769,314

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 9,576

InvestmentCompanyPortfolioTurnover

39.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$36,769,314
# of Portfolio Holdings	47
Portfolio Turnover Rate	39%
Total Advisory Fees Paid	$9,576

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Health Care	0.4%
Short-Term Investments	0.7%
Consumer Staples	0.9%
Utilities	1.1%
Energy	1.7%
Real Estate	2.0%
Industrials	8.0%
Materials	8.2%
Communication Services	10.5%
Consumer Discretionary	17.6%
Information Technology	23.9%
Financials	25.0%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

CRH PLC	6.7%
NVIDIA Corp.	6.2%
Apple, Inc.	5.6%
Ameriprise Financial, Inc.	5.5%
Ferrari NV	5.5%
JPMorgan Chase & Co.	5.4%
Microsoft Corp.	5.4%
Taiwan Semiconductor Manufacturing Co. Ltd.	4.6%
Amazon.com, Inc.	4.6%
TJX Cos., Inc.	4.0%
Total	53.5%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000169215

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Core Portfolio

Class Name

Class R6

Trading Symbol

MLMSX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Core Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$106	0.95%

Expenses Paid, Amount

$ 106

Expense Ratio, Percent

0.95%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI World Index:

↑ Stock selection in an artificial intelligence chip designer and a global provider of entertainment services

↑ Underweight to health care stocks in the U.S.

↑ Stock selection in the Asia ex-Japan technology sector

↓ Overweight to quality stocks in Asia ex-Japan

Line Graph [Table Text Block]

	Class R6	MSCI World Net Index
5/16	$5,000,000	$5,000,000
5/16	$5,000,000	$5,000,000
6/16	$4,865,000	$4,940,011
7/16	$5,090,000	$5,148,719
8/16	$5,070,000	$5,152,998
9/16	$5,135,000	$5,180,370
10/16	$4,960,000	$5,080,115
11/16	$5,020,000	$5,153,162
12/16	$5,054,958	$5,276,469
1/17	$5,165,834	$5,403,817
2/17	$5,337,189	$5,553,738
3/17	$5,352,308	$5,612,896
4/17	$5,443,026	$5,696,005
5/17	$5,584,141	$5,816,501
6/17	$5,604,300	$5,838,880
7/17	$5,776,361	$5,978,619
8/17	$5,796,541	$5,987,038
9/17	$5,862,124	$6,121,412
10/17	$6,013,470	$6,237,097
11/17	$6,200,129	$6,372,240
12/17	$6,181,943	$6,458,415
1/18	$6,587,316	$6,799,421
2/18	$6,333,958	$6,517,738
3/18	$6,126,204	$6,375,674
4/18	$5,999,525	$6,448,938
5/18	$6,055,264	$6,489,350
6/18	$5,979,256	$6,486,254
7/18	$6,116,070	$6,688,843
8/18	$6,146,473	$6,771,603
9/18	$6,151,540	$6,809,308
10/18	$5,614,420	$6,309,315
11/18	$5,675,226	$6,380,989
12/18	$5,186,888	$5,895,791
1/19	$5,631,478	$6,354,518
2/19	$5,789,895	$6,545,597
3/19	$5,876,769	$6,631,570
4/19	$6,249,817	$6,866,721
5/19	$5,800,116	$6,470,505
6/19	$6,137,391	$6,896,878
7/19	$6,193,604	$6,931,041
8/19	$6,101,620	$6,789,270
9/19	$6,178,273	$6,933,752
10/19	$6,357,131	$7,110,199
11/19	$6,587,092	$7,308,219
12/19	$6,789,551	$7,527,160
1/20	$6,805,005	$7,481,345
2/20	$6,243,502	$6,848,982
3/20	$5,269,887	$5,942,569
4/20	$5,810,784	$6,591,761
5/20	$6,176,534	$6,910,197
6/20	$6,444,407	$7,092,979
7/20	$6,949,245	$7,432,316
8/20	$7,495,293	$7,928,902
9/20	$7,304,692	$7,655,362
10/20	$7,258,329	$7,420,533
11/20	$7,912,557	$8,369,334
12/20	$8,242,247	$8,724,166
1/21	$8,298,913	$8,637,460
2/21	$8,561,634	$8,858,789
3/21	$8,571,937	$9,153,540
4/21	$9,030,412	$9,579,546
5/21	$9,097,380	$9,717,544
6/21	$9,169,500	$9,862,382
7/21	$9,236,468	$10,039,046
8/21	$9,360,102	$10,288,901
9/21	$9,014,958	$9,861,700
10/21	$9,669,186	$10,420,272
11/21	$9,463,130	$10,191,933
12/21	$9,688,802	$10,627,538
1/22	$9,204,630	$10,065,225
2/22	$8,790,395	$9,810,664
3/22	$8,811,914	$10,079,901
4/22	$8,220,149	$9,242,530
5/22	$8,155,593	$9,249,530
6/22	$7,456,235	$8,448,317
7/22	$8,182,492	$9,119,082
8/22	$7,832,812	$8,737,834
9/22	$7,144,213	$7,925,565
10/22	$7,440,096	$8,494,724
11/22	$8,160,973	$9,085,365
12/22	$7,821,114	$8,699,534
1/23	$8,566,496	$9,315,079
2/23	$8,318,036	$9,091,159
3/23	$8,323,437	$9,372,073
4/23	$8,399,055	$9,536,361
5/23	$8,128,989	$9,441,156
6/23	$8,841,964	$10,012,136
7/23	$9,031,010	$10,348,471
8/23	$8,706,931	$10,101,290
9/23	$8,231,614	$9,665,537
10/23	$8,058,772	$9,385,083
11/23	$8,906,780	$10,264,954
12/23	$9,229,273	$10,768,905
1/24	$9,474,154	$10,898,137
2/24	$10,236,004	$11,360,192
3/24	$10,589,720	$11,725,250
4/24	$10,099,959	$11,289,719
5/24	$10,595,162	$11,793,827
6/24	$10,812,834	$12,033,807
7/24	$10,856,368	$12,245,872
8/24	$11,242,735	$12,569,536
9/24	$11,308,036	$12,799,734
10/24	$11,335,245	$12,545,827
11/24	$11,884,866	$13,121,512
12/24	$11,446,205	$12,779,558

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 5/27/16 (Inception)
Class R6	24.02%	11.01%	10.11%
MSCI World Net Index	18.67%	11.17%	11.53%

Performance Inception Date

May 27, 2016

AssetsNet

$ 36,769,314

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 9,576

InvestmentCompanyPortfolioTurnover

39.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$36,769,314
# of Portfolio Holdings	47
Portfolio Turnover Rate	39%
Total Advisory Fees Paid	$9,576

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Health Care	0.4%
Short-Term Investments	0.7%
Consumer Staples	0.9%
Utilities	1.1%
Energy	1.7%
Real Estate	2.0%
Industrials	8.0%
Materials	8.2%
Communication Services	10.5%
Consumer Discretionary	17.6%
Information Technology	23.9%
Financials	25.0%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

CRH PLC	6.7%
NVIDIA Corp.	6.2%
Apple, Inc.	5.6%
Ameriprise Financial, Inc.	5.5%
Ferrari NV	5.5%
JPMorgan Chase & Co.	5.4%
Microsoft Corp.	5.4%
Taiwan Semiconductor Manufacturing Co. Ltd.	4.6%
Amazon.com, Inc.	4.6%
TJX Cos., Inc.	4.0%
Total	53.5%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000204518

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Endurance Portfolio

Class Name

Class A

Trading Symbol

MSJAX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Endurance Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$139	1.35%

Expenses Paid, Amount

$ 139

Expense Ratio, Percent

1.35%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World Net Index:

↓ Stock selection and an average underweight in information technology, where a holding in a global edge network that focuses on content delivery, cybersecurity and cloud computing services was the largest detractor

↓ Stock selection and an average overweight in consumer discretionary, where the largest detractor was a holding in a contemporary carpets and floor coverings company

↓ Stock selection and average overweight in health care, driven by underperformance in a holding in an analytical testing and laboratory services provider

↑ Stock selection in utilities, led by position in a U.S. electric power producer

↑ Stock selection in financials, led by holding in a global payments platform

↑ No exposure to materials

Line Graph [Table Text Block]

	Class A with maximum sales charge	MSCI All Country World Net Index
12/18	$9,479	$10,000
1/19	$10,133	$10,790
2/19	$10,711	$11,078
3/19	$11,251	$11,218
4/19	$12,142	$11,596
5/19	$10,891	$10,908
6/19	$11,564	$11,623
7/19	$11,355	$11,657
8/19	$11,479	$11,380
9/19	$11,062	$11,620
10/19	$11,100	$11,938
11/19	$12,360	$12,229
12/19	$12,313	$12,660
1/20	$13,109	$12,520
2/20	$12,209	$11,509
3/20	$8,976	$9,955
4/20	$11,033	$11,021
5/20	$13,602	$11,501
6/20	$15,725	$11,868
7/20	$17,024	$12,496
8/20	$19,318	$13,261
9/20	$19,100	$12,833
10/20	$18,531	$12,521
11/20	$23,592	$14,065
12/20	$25,746	$14,718
1/21	$33,529	$14,651
2/21	$34,321	$14,990
3/21	$31,476	$15,390
4/21	$33,285	$16,063
5/21	$31,955	$16,313
6/21	$35,485	$16,528
7/21	$33,431	$16,642
8/21	$32,669	$17,059
9/21	$31,349	$16,354
10/21	$34,028	$17,189
11/21	$30,146	$16,775
12/21	$28,114	$17,446
1/22	$22,983	$16,589
2/22	$20,392	$16,161
3/22	$19,173	$16,511
4/22	$15,219	$15,189
5/22	$13,007	$15,207
6/22	$11,379	$13,925
7/22	$12,382	$14,897
8/22	$11,891	$14,349
9/22	$10,795	$12,975
10/22	$10,877	$13,758
11/22	$10,088	$14,825
12/22	$9,453	$14,242
1/23	$11,440	$15,263
2/23	$11,788	$14,825
3/23	$12,372	$15,283
4/23	$11,901	$15,502
5/23	$13,263	$15,336
6/23	$15,240	$16,227
7/23	$17,237	$16,821
8/23	$16,407	$16,351
9/23	$15,137	$15,674
10/23	$13,427	$15,203
11/23	$14,093	$16,606
12/23	$16,262	$17,404
1/24	$15,378	$17,506
2/24	$16,356	$18,257
3/24	$17,126	$18,831
4/24	$15,909	$18,209
5/24	$15,888	$18,949
6/24	$15,378	$19,371
7/24	$16,523	$19,683
8/24	$16,387	$20,183
9/24	$17,428	$20,652
10/24	$16,887	$20,188
11/24	$17,761	$20,944
12/24	$17,168	$20,448

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 12/31/18 (Inception)
Class A	5.57%	6.87%	10.41%
Class A, with 5.25% maximum front end sales charge	0.00%	5.73%	9.43%
MSCI All Country World Net Index	17.49%	10.06%	12.66%

Performance Inception Date

Dec. 31, 2018

AssetsNet

$ 27,993,056

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 40,326

InvestmentCompanyPortfolioTurnover

157.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$27,993,056
# of Portfolio Holdings	32
Portfolio Turnover Rate	157%
Total Advisory Fees Paid	$40,326

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Financials	1.6%
Short-Term Investments	2.6%
Industrials	7.1%
Utilities	8.3%
Health Care	24.1%
Information Technology	25.0%
Consumer Discretionary	31.3%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Appian Corp.	11.7%
Victoria PLC	10.6%
Talen Energy Corp.	4.7%
Lithia Motors, Inc.	4.5%
Babcock International Group PLC	4.4%
Tesla, Inc.	3.9%
Delivery Hero SE	3.9%
Avadel Pharmaceuticals PLC	3.7%
Vistra Corp.	3.6%
Global-e Online Ltd.	3.1%
Total	54.1%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000204519

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Endurance Portfolio

Class Name

Class C

Trading Symbol

MSJCX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Endurance Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$215	2.10%

Expenses Paid, Amount

$ 215

Expense Ratio, Percent

2.10%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World Net Index:

↓ Stock selection and an average overweight in consumer discretionary, where the largest detractor was a holding in a contemporary carpets and floor coverings company

↓ Stock selection and average overweight in health care, driven by underperformance in a holding in an analytical testing and laboratory services provider

↑ Stock selection in utilities, led by position in a U.S. electric power producer

↑ Stock selection in financials, led by holding in a global payments platform

↑ No exposure to materials

Line Graph [Table Text Block]

	Class C	MSCI All Country World Net Index
12/18	$10,000	$10,000
1/19	$10,690	$10,790
2/19	$11,290	$11,078
3/19	$11,840	$11,218
4/19	$12,770	$11,596
5/19	$11,450	$10,908
6/19	$12,150	$11,623
7/19	$11,920	$11,657
8/19	$12,050	$11,380
9/19	$11,600	$11,620
10/19	$11,640	$11,938
11/19	$12,950	$12,229
12/19	$12,890	$12,660
1/20	$13,720	$12,520
2/20	$12,770	$11,509
3/20	$9,380	$9,955
4/20	$11,520	$11,021
5/20	$14,200	$11,501
6/20	$16,400	$11,868
7/20	$17,740	$12,496
8/20	$20,130	$13,261
9/20	$19,890	$12,833
10/20	$19,290	$12,521
11/20	$24,540	$14,065
12/20	$26,758	$14,718
1/21	$34,828	$14,651
2/21	$35,633	$14,990
3/21	$32,651	$15,390
4/21	$34,508	$16,063
5/21	$33,115	$16,313
6/21	$36,748	$16,528
7/21	$34,601	$16,642
8/21	$33,786	$17,059
9/21	$32,403	$16,354
10/21	$35,138	$17,189
11/21	$31,113	$16,775
12/21	$29,010	$17,446
1/22	$23,697	$16,589
2/22	$21,035	$16,161
3/22	$19,758	$16,511
4/22	$15,679	$15,189
5/22	$13,396	$15,207
6/22	$11,708	$13,925
7/22	$12,725	$14,897
8/22	$12,216	$14,349
9/22	$11,080	$12,975
10/22	$11,167	$13,758
11/22	$10,344	$14,825
12/22	$9,695	$14,242
1/23	$11,719	$15,263
2/23	$12,065	$14,825
3/23	$12,660	$15,283
4/23	$12,162	$15,502
5/23	$13,547	$15,336
6/23	$15,560	$16,227
7/23	$17,594	$16,821
8/23	$16,739	$16,351
9/23	$15,430	$15,674
10/23	$13,677	$15,203
11/23	$14,348	$16,606
12/23	$16,542	$17,404
1/24	$15,634	$17,506
2/24	$16,630	$18,257
3/24	$17,395	$18,831
4/24	$16,148	$18,209
5/24	$16,115	$18,949
6/24	$15,590	$19,371
7/24	$16,739	$19,683
8/24	$16,597	$20,183
9/24	$17,636	$20,652
10/24	$17,067	$20,188
11/24	$17,942	$20,944
12/24	$17,341	$20,448

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 12/31/18 (Inception)
Class C	4.83%	6.11%	9.61%
Class C, with 1% maximum contingent deferred sales charge	3.83%	6.11%	9.61%
MSCI All Country World Net Index	17.49%	10.06%	12.66%

Performance Inception Date

Dec. 31, 2018

AssetsNet

$ 27,993,056

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 40,326

InvestmentCompanyPortfolioTurnover

157.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$27,993,056
# of Portfolio Holdings	32
Portfolio Turnover Rate	157%
Total Advisory Fees Paid	$40,326

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Financials	1.6%
Short-Term Investments	2.6%
Industrials	7.1%
Utilities	8.3%
Health Care	24.1%
Information Technology	25.0%
Consumer Discretionary	31.3%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Appian Corp.	11.7%
Victoria PLC	10.6%
Talen Energy Corp.	4.7%
Lithia Motors, Inc.	4.5%
Babcock International Group PLC	4.4%
Tesla, Inc.	3.9%
Delivery Hero SE	3.9%
Avadel Pharmaceuticals PLC	3.7%
Vistra Corp.	3.6%
Global-e Online Ltd.	3.1%
Total	54.1%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000204520

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Endurance Portfolio

Class Name

Class I

Trading Symbol

MSJIX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Endurance Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$103	1.00%

Expenses Paid, Amount

$ 103

Expense Ratio, Percent

1.00%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World Net Index:

↓ Stock selection and an average overweight in consumer discretionary, where the largest detractor was a holding in a contemporary carpets and floor coverings company

↓ Stock selection and average overweight in health care, driven by underperformance in a holding in an analytical testing and laboratory services provider

↑ Stock selection in utilities, led by position in a U.S. electric power producer

↑ Stock selection in financials, led by holding in a global payments platform

↑ No exposure to materials

Line Graph [Table Text Block]

	Class I	MSCI All Country World Net Index
12/18	$1,000,000	$1,000,000
1/19	$1,070,000	$1,000,000
2/19	$1,131,000	$1,107,819
3/19	$1,188,000	$1,121,751
4/19	$1,282,000	$1,159,627
5/19	$1,151,000	$1,090,839
6/19	$1,222,000	$1,162,267
7/19	$1,200,000	$1,165,673
8/19	$1,214,000	$1,138,020
9/19	$1,170,000	$1,161,966
10/19	$1,175,000	$1,193,767
11/19	$1,309,000	$1,222,909
12/19	$1,303,000	$1,265,974
1/20	$1,389,000	$1,251,990
2/20	$1,294,000	$1,150,867
3/20	$951,000	$995,496
4/20	$1,169,000	$1,102,139
5/20	$1,442,000	$1,150,072
6/20	$1,667,000	$1,186,820
7/20	$1,806,000	$1,249,587
8/20	$2,050,000	$1,326,068
9/20	$2,028,000	$1,283,312
10/20	$1,968,000	$1,252,116
11/20	$2,506,000	$1,406,455
12/20	$2,736,680	$1,471,756
1/21	$3,563,568	$1,465,063
2/21	$3,649,251	$1,498,999
3/21	$3,347,813	$1,539,036
4/21	$3,541,889	$1,606,327
5/21	$3,401,494	$1,631,325
6/21	$3,778,291	$1,652,821
7/21	$3,560,471	$1,664,211
8/21	$3,480,983	$1,705,865
9/21	$3,341,619	$1,635,396
10/21	$3,626,540	$1,718,872
11/21	$3,213,612	$1,677,481
12/21	$2,999,112	$1,744,581
1/22	$2,452,247	$1,658,900
2/22	$2,176,653	$1,616,056
3/22	$2,046,961	$1,651,058
4/22	$1,625,465	$1,518,904
5/22	$1,389,859	$1,520,682
6/22	$1,215,856	$1,392,494
7/22	$1,322,851	$1,489,735
8/22	$1,270,975	$1,434,891
9/22	$1,154,253	$1,297,530
10/22	$1,163,980	$1,375,832
11/22	$1,079,680	$1,482,546
12/22	$1,012,673	$1,424,206
1/23	$1,225,583	$1,526,289
2/23	$1,262,329	$1,482,545
3/23	$1,326,094	$1,528,256
4/23	$1,275,298	$1,550,221
5/23	$1,422,281	$1,533,617
6/23	$1,635,191	$1,622,661
7/23	$1,849,182	$1,682,063
8/23	$1,761,640	$1,635,059
9/23	$1,624,384	$1,567,448
10/23	$1,441,735	$1,520,320
11/23	$1,513,065	$1,660,639
12/23	$1,747,427	$1,740,406
1/24	$1,652,733	$1,750,609
2/24	$1,759,539	$1,825,734
3/24	$1,842,120	$1,883,056
4/24	$1,712,192	$1,820,928
5/24	$1,709,990	$1,894,883
6/24	$1,654,935	$1,937,086
7/24	$1,779,358	$1,968,326
8/24	$1,766,145	$2,018,315
9/24	$1,877,355	$2,065,203
10/24	$1,818,998	$2,018,845
11/24	$1,914,792	$2,094,358
12/24	$1,851,968	$2,044,781

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 12/31/18 (Inception)
Class I	5.98%	7.28%	10.82%
MSCI All Country World Net Index	17.49%	10.06%	12.66%

Performance Inception Date

Dec. 31, 2018

AssetsNet

$ 27,993,056

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 40,326

InvestmentCompanyPortfolioTurnover

157.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$27,993,056
# of Portfolio Holdings	32
Portfolio Turnover Rate	157%
Total Advisory Fees Paid	$40,326

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Financials	1.6%
Short-Term Investments	2.6%
Industrials	7.1%
Utilities	8.3%
Health Care	24.1%
Information Technology	25.0%
Consumer Discretionary	31.3%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Appian Corp.	11.7%
Victoria PLC	10.6%
Talen Energy Corp.	4.7%
Lithia Motors, Inc.	4.5%
Babcock International Group PLC	4.4%
Tesla, Inc.	3.9%
Delivery Hero SE	3.9%
Avadel Pharmaceuticals PLC	3.7%
Vistra Corp.	3.6%
Global-e Online Ltd.	3.1%
Total	54.1%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000204517

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Endurance Portfolio

Class Name

Class R6

Trading Symbol

MSJSX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Endurance Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$98	0.95%

Expenses Paid, Amount

$ 98

Expense Ratio, Percent

0.95%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World Net Index:

↓ Stock selection and an average overweight in consumer discretionary, where the largest detractor was a holding in a contemporary carpets and floor coverings company

↓ Stock selection and average overweight in health care, driven by underperformance in a holding in an analytical testing and laboratory services provider

↑ Stock selection in utilities, led by position in a U.S. electric power producer

↑ Stock selection in financials, led by holding in a global payments platform

↑ No exposure to materials

Line Graph [Table Text Block]

	Class R6	MSCI All Country World Net Index
12/18	$5,000,000	$5,000,000
1/19	$5,350,000	$5,000,000
2/19	$5,655,000	$5,539,093
3/19	$5,940,000	$5,608,753
4/19	$6,410,000	$5,798,136
5/19	$5,755,000	$5,454,196
6/19	$6,110,000	$5,811,335
7/19	$6,000,000	$5,828,363
8/19	$6,075,000	$5,690,101
9/19	$5,850,000	$5,809,829
10/19	$5,875,000	$5,968,837
11/19	$6,545,000	$6,114,545
12/19	$6,520,000	$6,329,870
1/20	$6,945,000	$6,259,951
2/20	$6,470,000	$5,754,336
3/20	$4,755,000	$4,977,481
4/20	$5,850,000	$5,510,694
5/20	$7,215,000	$5,750,360
6/20	$8,345,000	$5,934,099
7/20	$9,035,000	$6,247,935
8/20	$10,260,000	$6,630,341
9/20	$10,150,000	$6,416,558
10/20	$9,850,000	$6,260,580
11/20	$12,545,000	$7,032,277
12/20	$13,696,971	$7,358,782
1/21	$17,837,556	$7,325,314
2/21	$18,266,071	$7,494,994
3/21	$16,758,526	$7,695,180
4/21	$17,729,137	$8,031,633
5/21	$17,026,993	$8,156,624
6/21	$18,916,586	$8,264,107
7/21	$17,827,231	$8,321,053
8/21	$17,424,530	$8,529,323
9/21	$16,727,549	$8,176,979
10/21	$18,157,651	$8,594,361
11/21	$16,092,522	$8,387,405
12/21	$15,014,602	$8,722,905
1/22	$12,279,761	$8,294,502
2/22	$10,901,531	$8,080,278
3/22	$10,247,547	$8,255,289
4/22	$8,139,665	$7,594,521
5/22	$6,961,414	$7,603,408
6/22	$6,085,832	$6,962,469
7/22	$6,626,315	$7,448,675
8/22	$6,366,883	$7,174,453
9/22	$5,783,162	$6,487,648
10/22	$5,831,805	$6,879,158
11/22	$5,404,824	$7,412,729
12/22	$5,069,725	$7,121,031
1/23	$6,134,476	$7,631,444
2/23	$6,323,644	$7,412,727
3/23	$6,642,529	$7,641,280
4/23	$6,388,502	$7,751,105
5/23	$7,123,558	$7,668,087
6/23	$8,188,309	$8,113,303
7/23	$9,263,869	$8,410,314
8/23	$8,826,078	$8,175,297
9/23	$8,139,665	$7,837,242
10/23	$7,226,250	$7,601,601
11/23	$7,582,968	$8,303,197
12/23	$8,753,387	$8,702,032
1/24	$8,285,144	$8,753,046
2/24	$8,813,983	$9,128,668
3/24	$9,232,647	$9,415,280
4/24	$8,577,107	$9,104,642
5/24	$8,571,598	$9,474,414
6/24	$8,296,161	$9,685,430
7/24	$8,918,649	$9,841,631
8/24	$8,852,544	$10,091,574
9/24	$9,414,436	$10,326,013
10/24	$9,122,472	$10,094,227
11/24	$9,596,224	$10,471,788
12/24	$9,282,788	$10,223,904

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 12/31/18 (Inception)
Class R6	6.05%	7.32%	10.86%
MSCI All Country World Net Index	17.49%	10.06%	12.66%

Performance Inception Date

Dec. 31, 2018

AssetsNet

$ 27,993,056

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 40,326

InvestmentCompanyPortfolioTurnover

157.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$27,993,056
# of Portfolio Holdings	32
Portfolio Turnover Rate	157%
Total Advisory Fees Paid	$40,326

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Financials	1.6%
Short-Term Investments	2.6%
Industrials	7.1%
Utilities	8.3%
Health Care	24.1%
Information Technology	25.0%
Consumer Discretionary	31.3%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Appian Corp.	11.7%
Victoria PLC	10.6%
Talen Energy Corp.	4.7%
Lithia Motors, Inc.	4.5%
Babcock International Group PLC	4.4%
Tesla, Inc.	3.9%
Delivery Hero SE	3.9%
Avadel Pharmaceuticals PLC	3.7%
Vistra Corp.	3.6%
Global-e Online Ltd.	3.1%
Total	54.1%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000007755

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Franchise Portfolio

Class Name

Class A

Trading Symbol

MSFBX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Franchise Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$121	1.16%

Expenses Paid, Amount

$ 121

Expense Ratio, Percent

1.16%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI World Net Index:

↓ Stock selection in information technology (IT) and consumer staples was the primary detractor

↓ The portfolio’s tilt toward software and IT services significantly lagged semiconductors and hardware. The relative performance impact of the “Magnificent Seven” was notable: the portfolio owned Microsoft and Alphabet, but the Fund’s high quality bar and strict valuation discipline precluded it from owning the other five, which detracted significantly.

↓ Consumer staples weakness was primarily down to stock-specific issues: Pernod Ricard and L’Oréal faced weakening U.S. and China demand and tariff threats, Constellation Brands suffered due to Mexican tariff fears, and we exited Reckitt Benckiser following a partial recovery in its share price

↑ Financials sector overweight

↑ Not owning the low quality, cyclical sectors, specifically materials, energy and real estate

Line Graph [Table Text Block]

	Class A with maximum sales charge	MSCI World Net Index
12/14	$9,477	$10,000
1/15	$9,434	$9,819
2/15	$9,876	$10,394
3/15	$9,520	$10,231
4/15	$9,962	$10,471
5/15	$10,038	$10,507
6/15	$9,805	$10,263
7/15	$10,364	$10,447
8/15	$9,486	$9,756
9/15	$9,558	$9,396
10/15	$10,427	$10,141
11/15	$10,235	$10,090
12/15	$10,069	$9,913
1/16	$10,074	$9,320
2/16	$9,832	$9,250
3/16	$10,438	$9,878
4/16	$10,468	$10,035
5/16	$10,604	$10,091
6/16	$10,740	$9,978
7/16	$10,802	$10,399
8/16	$10,792	$10,408
9/16	$10,807	$10,463
10/16	$10,564	$10,261
11/16	$10,316	$10,408
12/16	$10,609	$10,657
1/17	$10,940	$10,915
2/17	$11,393	$11,217
3/17	$11,651	$11,337
4/17	$11,909	$11,505
5/17	$12,456	$11,748
6/17	$12,340	$11,793
7/17	$12,446	$12,076
8/17	$12,378	$12,093
9/17	$12,351	$12,364
10/17	$12,704	$12,598
11/17	$13,026	$12,871
12/17	$13,323	$13,045
1/18	$13,851	$13,733
2/18	$13,119	$13,164
3/18	$13,191	$12,878
4/18	$13,125	$13,026
5/18	$13,273	$13,107
6/18	$13,752	$13,101
7/18	$14,021	$13,510
8/18	$14,149	$13,677
9/18	$14,404	$13,753
10/18	$13,583	$12,744
11/18	$13,977	$12,888
12/18	$13,086	$11,908
1/19	$13,644	$12,835
2/19	$14,347	$13,221
3/19	$15,055	$13,394
4/19	$15,456	$13,869
5/19	$15,026	$13,069
6/19	$15,816	$13,930
7/19	$15,845	$13,999
8/19	$15,915	$13,713
9/19	$15,816	$14,005
10/19	$15,938	$14,361
11/19	$16,420	$14,761
12/19	$16,912	$15,203
1/20	$17,179	$15,111
2/20	$15,899	$13,834
3/20	$14,697	$12,003
4/20	$16,044	$13,314
5/20	$16,676	$13,957
6/20	$16,991	$14,326
7/20	$17,896	$15,012
8/20	$18,551	$16,015
9/20	$18,102	$15,462
10/20	$17,222	$14,988
11/20	$18,424	$16,904
12/20	$19,102	$17,621
1/21	$18,606	$17,446
2/21	$18,537	$17,893
3/21	$19,334	$18,488
4/21	$20,357	$19,349
5/21	$20,483	$19,627
6/21	$20,947	$19,920
7/21	$21,537	$20,277
8/21	$21,738	$20,781
9/21	$20,884	$19,919
10/21	$22,158	$21,047
11/21	$21,568	$20,586
12/21	$23,231	$21,465
1/22	$21,833	$20,330
2/22	$21,104	$19,816
3/22	$21,124	$20,359
4/22	$20,151	$18,668
5/22	$20,183	$18,682
6/22	$18,939	$17,064
7/22	$20,183	$18,419
8/22	$19,075	$17,649
9/22	$17,302	$16,008
10/22	$18,205	$17,158
11/22	$19,809	$18,351
12/22	$19,177	$17,571
1/23	$20,054	$18,815
2/23	$19,295	$18,362
3/23	$20,381	$18,930
4/23	$21,048	$19,261
5/23	$20,302	$19,069
6/23	$21,414	$20,222
7/23	$21,630	$20,902
8/23	$21,519	$20,403
9/23	$20,355	$19,522
10/23	$19,975	$18,956
11/23	$21,650	$20,733
12/23	$22,277	$21,751
1/24	$22,743	$22,012
2/24	$23,355	$22,945
3/24	$23,362	$23,683
4/24	$22,064	$22,803
5/24	$22,550	$23,821
6/24	$22,883	$24,306
7/24	$23,702	$24,734
8/24	$24,554	$25,388
9/24	$25,053	$25,853
10/24	$24,267	$25,340
11/24	$24,947	$26,503
12/24	$24,216	$25,812

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class A	8.71%	7.44%	9.84%
Class A, with 5.25% maximum front end sales charge	3.01%	6.29%	9.25%
MSCI World Net Index	18.67%	11.17%	9.95%

AssetsNet

$ 2,763,486,138

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 20,891,138

InvestmentCompanyPortfolioTurnover

35.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,763,486,138
# of Portfolio Holdings	39
Portfolio Turnover Rate	35%
Total Advisory Fees Paid	$20,891,138

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.1%
Communication Services	2.9%
Consumer Discretionary	5.9%
Industrials	11.8%
Health Care	15.4%
Consumer Staples	18.0%
Financals	21.8%
Information Technology	23.1%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Microsoft Corp.	7.8%
SAP SE	7.3%
Visa, Inc.	6.6%
L'Oreal SA	4.2%
Accenture PLC	4.1%
Aon PLC	4.1%
Procter & Gamble Co.	3.3%
RELX PLC	3.2%
Abbott Laboratories	3.2%
Becton Dickinson & Co.	3.1%
Total	46.9%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155893

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Franchise Portfolio

Class Name

Class C

Trading Symbol

MSGFX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Franchise Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$198	1.90%

Expenses Paid, Amount

$ 198

Expense Ratio, Percent

1.90%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI World Net Index:

↓ Stock selection in information technology (IT) and consumer staples was the primary detractor

↓ The portfolio’s tilt toward software and IT services significantly lagged semiconductors and hardware. The relative performance impact of the “Magnificent Seven” was notable: the portfolio owned Microsoft and Alphabet, but the Fund’s high quality bar and strict valuation discipline precluded it from owning the other five, which detracted significantly.

↑ Financials sector overweight

↑ Not owning the low quality, cyclical sectors, specifically materials, energy and real estate

Line Graph [Table Text Block]

	Class C	MSCI World Net Index
9/15	$10,000	$10,000
10/15	$10,904	$10,792
11/15	$10,697	$10,739
12/15	$10,511	$10,550
1/16	$10,511	$9,919
2/16	$10,251	$9,845
3/16	$10,879	$10,513
4/16	$10,905	$10,679
5/16	$11,044	$10,739
6/16	$11,177	$10,619
7/16	$11,231	$11,068
8/16	$11,215	$11,077
9/16	$11,221	$11,136
10/16	$10,964	$10,920
11/16	$10,702	$11,077
12/16	$10,993	$11,342
1/17	$11,330	$11,616
2/17	$11,795	$11,938
3/17	$12,054	$12,066
4/17	$12,309	$12,244
5/17	$12,867	$12,503
6/17	$12,740	$12,551
7/17	$12,840	$12,852
8/17	$12,757	$12,870
9/17	$12,730	$13,159
10/17	$13,078	$13,407
11/17	$13,400	$13,698
12/17	$13,700	$13,883
1/18	$14,235	$14,616
2/18	$13,475	$14,011
3/18	$13,539	$13,705
4/18	$13,464	$13,863
5/18	$13,608	$13,950
6/18	$14,091	$13,943
7/18	$14,355	$14,378
8/18	$14,477	$14,556
9/18	$14,732	$14,637
10/18	$13,885	$13,563
11/18	$14,274	$13,717
12/18	$13,356	$12,674
1/19	$13,924	$13,660
2/19	$14,630	$14,070
3/19	$15,342	$14,255
4/19	$15,740	$14,761
5/19	$15,294	$13,909
6/19	$16,091	$14,826
7/19	$16,103	$14,899
8/19	$16,169	$14,594
9/19	$16,054	$14,905
10/19	$16,169	$15,284
11/19	$16,646	$15,710
12/19	$17,133	$16,180
1/20	$17,396	$16,082
2/20	$16,091	$14,723
3/20	$14,855	$12,774
4/20	$16,216	$14,170
5/20	$16,838	$14,854
6/20	$17,152	$15,247
7/20	$18,049	$15,977
8/20	$18,702	$17,044
9/20	$18,237	$16,456
10/20	$17,340	$15,951
11/20	$18,532	$17,991
12/20	$19,204	$18,754
1/21	$18,694	$18,567
2/21	$18,617	$19,043
3/21	$19,404	$19,677
4/21	$20,416	$20,592
5/21	$20,533	$20,889
6/21	$20,984	$21,200
7/21	$21,565	$21,580
8/21	$21,745	$22,117
9/21	$20,881	$21,199
10/21	$22,145	$22,399
11/21	$21,539	$21,909
12/21	$23,187	$22,845
1/22	$21,776	$21,636
2/22	$21,038	$21,089
3/22	$21,045	$21,668
4/22	$20,063	$19,868
5/22	$20,089	$19,883
6/22	$18,830	$18,161
7/22	$20,063	$19,602
8/22	$18,942	$18,783
9/22	$17,176	$17,037
10/22	$18,059	$18,260
11/22	$19,634	$19,530
12/22	$18,999	$18,701
1/23	$19,850	$20,024
2/23	$19,092	$19,542
3/23	$20,150	$20,146
4/23	$20,808	$20,499
5/23	$20,050	$20,295
6/23	$21,140	$21,522
7/23	$21,340	$22,245
8/23	$21,220	$21,714
9/23	$20,050	$20,777
10/23	$19,676	$20,174
11/23	$21,325	$22,066
12/23	$21,943	$23,149
1/24	$22,402	$23,427
2/24	$23,005	$24,420
3/24	$23,012	$25,205
4/24	$21,733	$24,268
5/24	$22,212	$25,352
6/24	$22,540	$25,868
7/24	$23,347	$26,324
8/24	$24,186	$27,020
9/24	$24,678	$27,514
10/24	$23,904	$26,969
11/24	$24,573	$28,206
12/24	$23,854	$27,471

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 9/30/15 (Inception)
Class C, with conversion to Class A after 8 years	7.90%	6.65%	9.85%
Class C, with 1% maximum contingent deferred sales charge and conversion to Class A after 8 years	6.94%	6.65%	9.85%
MSCI World Net Index	18.67%	11.17%	11.54%

Performance Inception Date

Sep. 30, 2015

AssetsNet

$ 2,763,486,138

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 20,891,138

InvestmentCompanyPortfolioTurnover

35.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,763,486,138
# of Portfolio Holdings	39
Portfolio Turnover Rate	35%
Total Advisory Fees Paid	$20,891,138

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.1%
Communication Services	2.9%
Consumer Discretionary	5.9%
Industrials	11.8%
Health Care	15.4%
Consumer Staples	18.0%
Financals	21.8%
Information Technology	23.1%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Microsoft Corp.	7.8%
SAP SE	7.3%
Visa, Inc.	6.6%
L'Oreal SA	4.2%
Accenture PLC	4.1%
Aon PLC	4.1%
Procter & Gamble Co.	3.3%
RELX PLC	3.2%
Abbott Laboratories	3.2%
Becton Dickinson & Co.	3.1%
Total	46.9%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000007754

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Franchise Portfolio

Class Name

Class I

Trading Symbol

MSFAX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Franchise Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$97	0.93%

Expenses Paid, Amount

$ 97

Expense Ratio, Percent

0.93%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI World Net Index:

↓ Stock selection in information technology (IT) and consumer staples was the primary detractor

↓ The portfolio’s tilt toward software and IT services significantly lagged semiconductors and hardware. The relative performance impact of the “Magnificent Seven” was notable: the portfolio owned Microsoft and Alphabet, but the Fund’s high quality bar and strict valuation discipline precluded it from owning the other five, which detracted significantly.

↑ Financials sector overweight

↑ Not owning the low quality, cyclical sectors, specifically materials, energy and real estate

Line Graph [Table Text Block]

	Class I	MSCI World Net Index
12/14	$1,000,000	$1,000,000
1/15	$995,560	$981,880
2/15	$1,042,427	$1,039,407
3/15	$1,004,933	$1,023,137
4/15	$1,052,294	$1,047,132
5/15	$1,060,187	$1,050,739
6/15	$1,035,520	$1,026,307
7/15	$1,095,012	$1,044,729
8/15	$1,002,973	$975,595
9/15	$1,010,436	$939,611
10/15	$1,102,972	$1,014,069
11/15	$1,082,574	$1,009,024
12/15	$1,064,961	$991,288
1/16	$1,066,008	$931,985
2/16	$1,040,340	$925,048
3/16	$1,104,772	$987,821
4/16	$1,108,439	$1,003,452
5/16	$1,123,106	$1,009,088
6/16	$1,137,774	$997,781
7/16	$1,144,196	$1,039,935
8/16	$1,143,670	$1,040,800
9/16	$1,145,248	$1,046,328
10/16	$1,119,997	$1,026,079
11/16	$1,093,694	$1,040,833
12/16	$1,125,051	$1,065,738
1/17	$1,160,619	$1,091,460
2/17	$1,208,773	$1,121,741
3/17	$1,236,681	$1,133,690
4/17	$1,264,041	$1,150,476
5/17	$1,322,592	$1,174,814
6/17	$1,310,006	$1,179,334
7/17	$1,321,557	$1,207,558
8/17	$1,314,434	$1,209,259
9/17	$1,312,243	$1,236,399
10/17	$1,350,048	$1,259,766
11/17	$1,384,019	$1,287,062
12/17	$1,415,871	$1,304,467
1/18	$1,472,575	$1,373,343
2/18	$1,394,679	$1,316,449
3/18	$1,403,270	$1,287,755
4/18	$1,396,397	$1,302,553
5/18	$1,412,435	$1,310,715
6/18	$1,463,983	$1,310,090
7/18	$1,493,143	$1,351,009
8/18	$1,506,995	$1,367,725
9/18	$1,534,699	$1,375,340
10/18	$1,447,546	$1,274,352
11/18	$1,489,680	$1,288,829
12/18	$1,394,582	$1,190,829
1/19	$1,455,137	$1,283,482
2/19	$1,530,225	$1,322,076
3/19	$1,605,919	$1,339,441
4/19	$1,649,518	$1,386,936
5/19	$1,603,497	$1,306,909
6/19	$1,688,879	$1,393,028
7/19	$1,691,907	$1,399,928
8/19	$1,699,779	$1,371,293
9/19	$1,689,485	$1,400,475
10/19	$1,702,807	$1,436,114
11/19	$1,754,884	$1,476,110
12/19	$1,807,335	$1,520,332
1/20	$1,837,109	$1,511,078
2/20	$1,700,276	$1,383,354
3/20	$1,571,045	$1,200,277
4/20	$1,716,113	$1,331,400
5/20	$1,783,896	$1,395,718
6/20	$1,818,737	$1,432,636
7/20	$1,915,027	$1,501,175
8/20	$1,986,611	$1,601,475
9/20	$1,938,466	$1,546,226
10/20	$1,844,710	$1,498,795
11/20	$1,973,308	$1,690,433
12/20	$2,046,198	$1,762,102
1/21	$1,993,732	$1,744,589
2/21	$1,987,173	$1,789,293
3/21	$2,072,431	$1,848,827
4/21	$2,182,611	$1,934,872
5/21	$2,197,040	$1,962,744
6/21	$2,246,883	$1,991,999
7/21	$2,311,155	$2,027,681
8/21	$2,332,141	$2,078,147
9/21	$2,241,636	$1,991,861
10/21	$2,378,705	$2,104,681
11/21	$2,316,401	$2,058,561
12/21	$2,494,746	$2,146,544
1/22	$2,345,021	$2,032,969
2/22	$2,267,461	$1,981,552
3/22	$2,269,484	$2,035,933
4/22	$2,166,295	$1,866,801
5/22	$2,170,341	$1,868,215
6/22	$2,036,128	$1,706,386
7/22	$2,171,016	$1,841,867
8/22	$2,051,640	$1,764,863
9/22	$1,861,449	$1,600,801
10/22	$1,959,242	$1,715,760
11/22	$2,131,899	$1,835,057
12/22	$2,064,614	$1,757,127
1/23	$2,159,270	$1,881,455
2/23	$2,077,646	$1,836,227
3/23	$2,194,938	$1,892,966
4/23	$2,267,645	$1,926,149
5/23	$2,188,079	$1,906,919
6/23	$2,308,115	$2,022,246
7/23	$2,332,122	$2,090,179
8/23	$2,320,461	$2,040,253
9/23	$2,194,938	$1,952,240
10/23	$2,154,469	$1,895,594
11/23	$2,335,551	$2,073,310
12/23	$2,403,600	$2,175,097
1/24	$2,454,666	$2,201,200
2/24	$2,521,821	$2,294,525
3/24	$2,522,520	$2,368,260
4/24	$2,383,313	$2,280,291
5/24	$2,435,778	$2,382,111
6/24	$2,472,154	$2,430,582
7/24	$2,560,995	$2,473,414
8/24	$2,654,033	$2,538,788
9/24	$2,708,596	$2,585,283
10/24	$2,623,953	$2,533,999
11/24	$2,698,103	$2,650,276
12/24	$2,619,093	$2,581,208

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class I	8.97%	7.70%	10.11%
MSCI World Net Index	18.67%	11.17%	9.95%

AssetsNet

$ 2,763,486,138

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 20,891,138

InvestmentCompanyPortfolioTurnover

35.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,763,486,138
# of Portfolio Holdings	39
Portfolio Turnover Rate	35%
Total Advisory Fees Paid	$20,891,138

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.1%
Communication Services	2.9%
Consumer Discretionary	5.9%
Industrials	11.8%
Health Care	15.4%
Consumer Staples	18.0%
Financals	21.8%
Information Technology	23.1%

Top Ten Holdings (% of total investments)

Microsoft Corp.	7.8%
SAP SE	7.3%
Visa, Inc.	6.6%
L'Oreal SA	4.2%
Accenture PLC	4.1%
Aon PLC	4.1%
Procter & Gamble Co.	3.3%
RELX PLC	3.2%
Abbott Laboratories	3.2%
Becton Dickinson & Co.	3.1%
Total	46.9%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000113809

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Franchise Portfolio

Class Name

Class L

Trading Symbol

MSFLX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Franchise Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$174	1.67%

Expenses Paid, Amount

$ 174

Expense Ratio, Percent

1.67%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI World Net Index:

↓ Stock selection in information technology (IT) and consumer staples was the primary detractor

↓ The portfolio’s tilt toward software and IT services significantly lagged semiconductors and hardware. The relative performance impact of the “Magnificent Seven” was notable: the portfolio owned Microsoft and Alphabet, but the Fund’s high quality bar and strict valuation discipline precluded it from owning the other five, which detracted significantly.

↑ Financials sector overweight

↑ Not owning the low quality, cyclical sectors, specifically materials, energy and real estate

Line Graph [Table Text Block]

	Class L	MSCI World Net Index
12/14	$10,000	$10,000
1/15	$9,950	$9,819
2/15	$10,413	$10,394
3/15	$10,030	$10,231
4/15	$10,493	$10,471
5/15	$10,569	$10,507
6/15	$10,317	$10,263
7/15	$10,904	$10,447
8/15	$9,980	$9,756
9/15	$10,046	$9,396
10/15	$10,960	$10,141
11/15	$10,751	$10,090
12/15	$10,572	$9,913
1/16	$10,572	$9,320
2/16	$10,312	$9,250
3/16	$10,944	$9,878
4/16	$10,976	$10,035
5/16	$11,114	$10,091
6/16	$11,252	$9,978
7/16	$11,312	$10,399
8/16	$11,296	$10,408
9/16	$11,306	$10,463
10/16	$11,045	$10,261
11/16	$10,784	$10,408
12/16	$11,082	$10,657
1/17	$11,429	$10,915
2/17	$11,897	$11,217
3/17	$12,161	$11,337
4/17	$12,425	$11,505
5/17	$12,987	$11,748
6/17	$12,860	$11,793
7/17	$12,966	$12,076
8/17	$12,888	$12,093
9/17	$12,861	$12,364
10/17	$13,219	$12,598
11/17	$13,550	$12,871
12/17	$13,850	$13,045
1/18	$14,400	$13,733
2/18	$13,627	$13,164
3/18	$13,701	$12,878
4/18	$13,627	$13,026
5/18	$13,770	$13,107
6/18	$14,269	$13,101
7/18	$14,537	$13,510
8/18	$14,664	$13,677
9/18	$14,924	$13,753
10/18	$14,070	$12,744
11/18	$14,468	$12,888
12/18	$13,534	$11,908
1/19	$14,111	$12,835
2/19	$14,832	$13,221
3/19	$15,554	$13,394
4/19	$15,963	$13,869
5/19	$15,512	$13,069
6/19	$16,323	$13,930
7/19	$16,347	$13,999
8/19	$16,414	$13,713
9/19	$16,299	$14,005
10/19	$16,420	$14,361
11/19	$16,907	$14,761
12/19	$17,407	$15,203
1/20	$17,682	$15,111
2/20	$16,351	$13,834
3/20	$15,106	$12,003
4/20	$16,488	$13,314
5/20	$17,126	$13,957
6/20	$17,451	$14,326
7/20	$18,364	$15,012
8/20	$19,033	$16,015
9/20	$18,564	$15,462
10/20	$17,657	$14,988
11/20	$18,877	$16,904
12/20	$19,563	$17,621
1/21	$19,048	$17,446
2/21	$18,971	$17,893
3/21	$19,775	$18,488
4/21	$20,817	$19,349
5/21	$20,940	$19,627
6/21	$21,403	$19,920
7/21	$21,995	$20,277
8/21	$22,188	$20,781
9/21	$21,306	$19,919
10/21	$22,599	$21,047
11/21	$21,995	$20,586
12/21	$23,675	$21,465
1/22	$22,241	$20,330
2/22	$21,492	$19,816
3/22	$21,499	$20,359
4/22	$20,506	$18,668
5/22	$20,532	$18,682
6/22	$19,250	$17,064
7/22	$20,512	$18,419
8/22	$19,375	$17,649
9/22	$17,567	$16,008
10/22	$18,474	$17,158
11/22	$20,092	$18,351
12/22	$19,446	$17,571
1/23	$20,323	$18,815
2/23	$19,546	$18,362
3/23	$20,635	$18,930
4/23	$21,312	$19,261
5/23	$20,542	$19,069
6/23	$21,664	$20,222
7/23	$21,870	$20,902
8/23	$21,750	$20,403
9/23	$20,562	$19,522
10/23	$20,170	$18,956
11/23	$21,850	$20,733
12/23	$22,474	$21,751
1/24	$22,938	$22,012
2/24	$23,543	$22,945
3/24	$23,537	$23,683
4/24	$22,225	$22,803
5/24	$22,702	$23,821
6/24	$23,032	$24,306
7/24	$23,839	$24,734
8/24	$24,687	$25,388
9/24	$25,178	$25,853
10/24	$24,377	$25,340
11/24	$25,050	$26,503
12/24	$24,306	$25,812

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class L	8.15%	6.90%	9.29%
MSCI World Net Index	18.67%	11.17%	9.95%

AssetsNet

$ 2,763,486,138

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 20,891,138

InvestmentCompanyPortfolioTurnover

35.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,763,486,138
# of Portfolio Holdings	39
Portfolio Turnover Rate	35%
Total Advisory Fees Paid	$20,891,138

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.1%
Communication Services	2.9%
Consumer Discretionary	5.9%
Industrials	11.8%
Health Care	15.4%
Consumer Staples	18.0%
Financals	21.8%
Information Technology	23.1%

Top Ten Holdings (% of total investments)

Microsoft Corp.	7.8%
SAP SE	7.3%
Visa, Inc.	6.6%
L'Oreal SA	4.2%
Accenture PLC	4.1%
Aon PLC	4.1%
Procter & Gamble Co.	3.3%
RELX PLC	3.2%
Abbott Laboratories	3.2%
Becton Dickinson & Co.	3.1%
Total	46.9%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000156276

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Franchise Portfolio

Class Name

Class R6

Trading Symbol

MGISX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Franchise Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$87	0.83%

Expenses Paid, Amount

$ 87

Expense Ratio, Percent

0.83%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI World Net Index:

↓ Stock selection in information technology (IT) and consumer staples was the primary detractor

↓ The portfolio’s tilt toward software and IT services significantly lagged semiconductors and hardware. The relative performance impact of the “Magnificent Seven” was notable: the portfolio owned Microsoft and Alphabet, but the Fund’s high quality bar and strict valuation discipline precluded it from owning the other five, which detracted significantly.

↑ Financials sector overweight

↑ Not owning the low quality, cyclical sectors, specifically materials, energy and real estate

Line Graph [Table Text Block]

	Class R6	MSCI World Net Index
5/15	$5,000,000	$5,000,000
5/15	$5,000,000	$5,000,000
6/15	$4,883,667	$5,000,000
7/15	$5,164,236	$4,971,402
8/15	$4,730,168	$4,642,421
9/15	$4,765,363	$4,471,189
10/15	$5,201,777	$4,825,504
11/15	$5,105,578	$4,801,494
12/15	$5,022,399	$4,717,096
1/16	$5,027,342	$4,434,900
2/16	$4,908,703	$4,401,893
3/16	$5,212,716	$4,700,601
4/16	$5,230,017	$4,774,981
5/16	$5,299,224	$4,801,800
6/16	$5,368,430	$4,747,994
7/16	$5,398,732	$4,948,589
8/16	$5,396,250	$4,952,702
9/16	$5,403,696	$4,979,010
10/16	$5,284,552	$4,882,652
11/16	$5,162,925	$4,952,860
12/16	$5,308,853	$5,071,374
1/17	$5,479,357	$5,193,772
2/17	$5,706,695	$5,337,865
3/17	$5,835,864	$5,394,724
4/17	$5,967,616	$5,474,603
5/17	$6,241,455	$5,590,415
6/17	$6,184,621	$5,611,924
7/17	$6,239,151	$5,746,231
8/17	$6,208,110	$5,754,323
9/17	$6,197,763	$5,883,474
10/17	$6,373,660	$5,994,663
11/17	$6,536,622	$6,124,553
12/17	$6,689,166	$6,207,378
1/18	$6,957,057	$6,535,129
2/18	$6,589,045	$6,264,395
3/18	$6,629,635	$6,127,853
4/18	$6,597,163	$6,198,270
5/18	$6,672,930	$6,237,111
6/18	$6,916,468	$6,234,135
7/18	$7,054,230	$6,428,850
8/18	$7,119,673	$6,508,393
9/18	$7,250,560	$6,544,632
10/18	$6,841,540	$6,064,074
11/18	$7,037,869	$6,132,961
12/18	$6,592,295	$5,666,623
1/19	$6,875,681	$6,107,519
2/19	$7,233,491	$6,291,171
3/19	$7,591,301	$6,373,802
4/19	$7,797,400	$6,599,813
5/19	$7,582,714	$6,218,998
6/19	$7,983,461	$6,628,798
7/19	$8,000,636	$6,661,633
8/19	$8,037,849	$6,525,373
9/19	$7,989,186	$6,664,239
10/19	$8,052,161	$6,833,827
11/19	$8,298,334	$7,024,150
12/19	$8,548,520	$7,234,581
1/20	$8,689,347	$7,190,547
2/20	$8,042,141	$6,582,764
3/20	$7,433,887	$5,711,583
4/20	$8,120,045	$6,335,541
5/20	$8,443,649	$6,641,599
6/20	$8,605,450	$6,817,276
7/20	$9,063,888	$7,143,424
8/20	$9,402,473	$7,620,707
9/20	$9,174,752	$7,357,800
10/20	$8,731,296	$7,132,099
11/20	$9,342,547	$8,044,020
12/20	$9,688,361	$8,385,060
1/21	$9,440,021	$8,301,724
2/21	$9,408,978	$8,514,450
3/21	$9,815,635	$8,797,744
4/21	$10,337,149	$9,207,192
5/21	$10,405,442	$9,339,825
6/21	$10,644,469	$9,479,034
7/21	$10,948,686	$9,648,830
8/21	$11,051,126	$9,888,974
9/21	$10,619,635	$9,478,378
10/21	$11,271,528	$10,015,239
11/21	$10,976,624	$9,795,775
12/21	$11,824,435	$10,214,448
1/22	$11,115,160	$9,673,993
2/22	$10,747,743	$9,429,326
3/22	$10,760,523	$9,688,098
4/22	$10,268,504	$8,883,275
5/22	$10,287,673	$8,890,003
6/22	$9,655,077	$8,119,933
7/22	$10,294,063	$8,764,626
8/22	$9,731,756	$8,398,196
9/22	$8,830,786	$7,617,501
10/22	$9,290,855	$8,164,536
11/22	$10,111,952	$8,732,219
12/22	$9,794,187	$8,361,386
1/23	$10,243,074	$8,953,004
2/23	$9,859,243	$8,737,787
3/23	$10,415,472	$9,007,782
4/23	$10,763,522	$9,165,685
5/23	$10,382,944	$9,074,180
6/23	$10,955,438	$9,622,967
7/23	$11,069,286	$9,946,229
8/23	$11,013,988	$9,708,656
9/23	$10,418,725	$9,289,840
10/23	$10,226,810	$9,020,287
11/23	$11,088,802	$9,865,958
12/23	$11,412,213	$10,350,320
1/24	$11,657,923	$10,474,529
2/24	$11,973,361	$10,918,624
3/24	$11,980,001	$11,269,492
4/24	$11,319,242	$10,850,890
5/24	$11,568,272	$11,335,404
6/24	$11,744,253	$11,566,056
7/24	$12,165,944	$11,769,878
8/24	$12,607,557	$12,080,961
9/24	$12,869,868	$12,302,211
10/24	$12,468,100	$12,058,173
11/24	$12,823,383	$12,611,482
12/24	$12,446,807	$12,282,819

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 5/29/15 (Inception)
Class R6	9.07%	7.80%	9.98%
MSCI World Net Index	18.67%	11.17%	9.82%

Performance Inception Date

May 29, 2015

AssetsNet

$ 2,763,486,138

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 20,891,138

InvestmentCompanyPortfolioTurnover

35.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,763,486,138
# of Portfolio Holdings	39
Portfolio Turnover Rate	35%
Total Advisory Fees Paid	$20,891,138

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.1%
Communication Services	2.9%
Consumer Discretionary	5.9%
Industrials	11.8%
Health Care	15.4%
Consumer Staples	18.0%
Financals	21.8%
Information Technology	23.1%

Top Ten Holdings (% of total investments)

Microsoft Corp.	7.8%
SAP SE	7.3%
Visa, Inc.	6.6%
L'Oreal SA	4.2%
Accenture PLC	4.1%
Aon PLC	4.1%
Procter & Gamble Co.	3.3%
RELX PLC	3.2%
Abbott Laboratories	3.2%
Becton Dickinson & Co.	3.1%
Total	46.9%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000094893

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Insight Portfolio

Class Name

Class A

Trading Symbol

MIGPX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Insight Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$163	1.32%

Expenses Paid, Amount

$ 163

Expense Ratio, Percent

1.32%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World Net Index:

↑ Stock selection and average overweight in consumer discretionary, led by a position in a leading seller of used cars online in the United States

↑ Stock selection in information technology, led by a position in an enterprise analytics platform and Bitcoin developing company

↑ Stock selection and average underweight in industrials, where an operator of a leading global ridesharing services platform (sold) and an operator of a Southeast Asian super app (an integrated app platform combining multiple services) contributed

↓ Stock selection in health care, where a position in an underperforming health care services provider was the largest detractor

↓ Average underweight to financials

↓ Stock selection in materials, driven by a position in a company that uses genetic engineering/synthetic biology technology to transform manufacturing of physical products (sold from the portfolio)

Line Graph [Table Text Block]

	Class A with maximum sales charge	MSCI All Country World Net Index
12/14	$9,478	$10,000
1/15	$9,575	$9,844
2/15	$10,075	$10,392
3/15	$10,000	$10,231
4/15	$10,052	$10,528
5/15	$10,007	$10,514
6/15	$9,933	$10,266
7/15	$10,222	$10,355
8/15	$9,470	$9,646
9/15	$9,158	$9,296
10/15	$9,956	$10,026
11/15	$10,040	$9,943
12/15	$9,800	$9,764
1/16	$9,130	$9,175
2/16	$8,795	$9,112
3/16	$9,330	$9,787
4/16	$9,409	$9,931
5/16	$9,521	$9,944
6/16	$9,489	$9,884
7/16	$9,995	$10,310
8/16	$10,068	$10,344
9/16	$10,237	$10,408
10/16	$10,011	$10,231
11/16	$9,778	$10,309
12/16	$9,789	$10,531
1/17	$10,286	$10,819
2/17	$10,547	$11,123
3/17	$10,889	$11,259
4/17	$11,533	$11,434
5/17	$12,087	$11,687
6/17	$12,006	$11,740
7/17	$12,519	$12,068
8/17	$12,748	$12,114
9/17	$12,699	$12,348
10/17	$13,066	$12,605
11/17	$13,481	$12,849
12/17	$13,805	$13,056
1/18	$14,903	$13,793
2/18	$14,567	$13,213
3/18	$14,231	$12,931
4/18	$14,558	$13,054
5/18	$14,894	$13,070
6/18	$14,966	$13,000
7/18	$14,821	$13,392
8/18	$15,264	$13,497
9/18	$15,218	$13,555
10/18	$13,647	$12,540
11/18	$13,946	$12,723
12/18	$12,972	$11,827
1/19	$14,315	$12,761
2/19	$15,129	$13,102
3/19	$15,621	$13,267
4/19	$16,312	$13,715
5/19	$15,678	$12,901
6/19	$16,634	$13,746
7/19	$16,794	$13,786
8/19	$16,208	$13,459
9/19	$15,839	$13,742
10/19	$15,981	$14,119
11/19	$16,804	$14,463
12/19	$16,998	$14,973
1/20	$17,782	$14,807
2/20	$16,921	$13,611
3/20	$14,841	$11,774
4/20	$17,637	$13,035
5/20	$21,023	$13,602
6/20	$23,403	$14,036
7/20	$25,377	$14,779
8/20	$27,108	$15,683
9/20	$26,557	$15,178
10/20	$26,247	$14,809
11/20	$30,940	$16,634
12/20	$33,056	$17,406
1/21	$32,535	$17,327
2/21	$33,968	$17,729
3/21	$31,452	$18,202
4/21	$32,505	$18,998
5/21	$31,252	$19,294
6/21	$33,858	$19,548
7/21	$33,547	$19,682
8/21	$34,239	$20,175
9/21	$31,432	$19,342
10/21	$33,607	$20,329
11/21	$31,352	$19,839
12/21	$28,266	$20,633
1/22	$21,587	$19,620
2/22	$21,764	$19,113
3/22	$19,989	$19,527
4/22	$15,698	$17,964
5/22	$13,778	$17,985
6/22	$12,665	$16,469
7/22	$14,520	$17,619
8/22	$14,440	$16,970
9/22	$13,181	$15,346
10/22	$13,520	$16,272
11/22	$13,455	$17,534
12/22	$11,919	$16,844
1/23	$14,180	$18,051
2/23	$13,615	$17,534
3/23	$14,390	$18,075
4/23	$13,679	$18,334
5/23	$14,891	$18,138
6/23	$15,973	$19,191
7/23	$17,346	$19,894
8/23	$15,747	$19,338
9/23	$14,745	$18,538
10/23	$13,453	$17,981
11/23	$15,924	$19,640
12/23	$17,943	$20,584
1/24	$16,716	$20,704
2/24	$18,783	$21,593
3/24	$19,332	$22,271
4/24	$17,830	$21,536
5/24	$17,862	$22,411
6/24	$18,508	$22,910
7/24	$18,686	$23,279
8/24	$20,059	$23,870
9/24	$21,351	$24,425
10/24	$22,724	$23,877
11/24	$27,892	$24,770
12/24	$26,499	$24,183

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class A	47.68%	9.29%	10.83%
Class A, with 5.25% maximum front end sales charge	39.88%	8.12%	10.24%
MSCI All Country World Net Index	17.49%	10.06%	9.23%

AssetsNet

$ 69,383,054

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 274,227

InvestmentCompanyPortfolioTurnover

54.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$69,383,054
# of Portfolio Holdings	31
Portfolio Turnover Rate	54%
Total Advisory Fees Paid	$274,227

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	2.4%
Industrials	2.6%
Investment Companies	2.8%
Health Care	6.3%
Communication Services	9.1%
Financals	12.6%
Information Technology	29.8%
Consumer Discretionary	34.4%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Tesla, Inc.	8.9%
Cloudflare, Inc.	8.2%
Global-e Online Ltd.	6.6%
Affirm Holdings, Inc.	6.3%
Shopify, Inc.	6.3%
Adyen NV	5.9%
MercadoLibre, Inc.	5.4%
DoorDash, Inc.	4.9%
Aurora Innovation, Inc.	4.5%
Trade Desk, Inc.	4.3%
Total	61.3%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155902

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Insight Portfolio

Class Name

Class C

Trading Symbol

MSPTX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Insight Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$259	2.10%

Expenses Paid, Amount

$ 259

Expense Ratio, Percent

2.10%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World Net Index:

↑ Stock selection and average overweight in consumer discretionary, led by a position in a leading seller of used cars online in the United States

↑ Stock selection in information technology, led by a position in an enterprise analytics platform and Bitcoin developing company

↓ Stock selection in health care, where a position in an underperforming health care services provider was the largest detractor

↓ Average underweight to financials

Line Graph [Table Text Block]

	Class C	MSCI All Country World Net Index
4/15	$10,000	$10,000
5/15	$9,947	$9,987
6/15	$9,865	$9,752
7/15	$10,148	$9,837
8/15	$9,396	$9,162
9/15	$9,089	$8,830
10/15	$9,864	$9,523
11/15	$9,948	$9,445
12/15	$9,706	$9,274
1/16	$9,029	$8,715
2/16	$8,691	$8,655
3/16	$9,215	$9,296
4/16	$9,287	$9,434
5/16	$9,400	$9,446
6/16	$9,352	$9,388
7/16	$9,847	$9,793
8/16	$9,913	$9,826
9/16	$10,076	$9,886
10/16	$9,847	$9,718
11/16	$9,611	$9,792
12/16	$9,614	$10,004
1/17	$10,101	$10,277
2/17	$10,348	$10,566
3/17	$10,678	$10,695
4/17	$11,305	$10,861
5/17	$11,849	$11,101
6/17	$11,758	$11,152
7/17	$12,253	$11,463
8/17	$12,459	$11,507
9/17	$12,409	$11,730
10/17	$12,764	$11,973
11/17	$13,160	$12,205
12/17	$13,462	$12,402
1/18	$14,522	$13,101
2/18	$14,181	$12,551
3/18	$13,849	$12,283
4/18	$14,154	$12,400
5/18	$14,476	$12,415
6/18	$14,532	$12,348
7/18	$14,393	$12,720
8/18	$14,806	$12,820
9/18	$14,750	$12,876
10/18	$13,228	$11,911
11/18	$13,494	$12,086
12/18	$12,550	$11,234
1/19	$13,841	$12,121
2/19	$14,611	$12,446
3/19	$15,083	$12,602
4/19	$15,738	$13,028
5/19	$15,122	$12,255
6/19	$16,027	$13,057
7/19	$16,172	$13,095
8/19	$15,594	$12,785
9/19	$15,228	$13,054
10/19	$15,353	$13,411
11/19	$16,133	$13,738
12/19	$16,312	$14,222
1/20	$17,052	$14,065
2/20	$16,213	$12,929
3/20	$14,211	$11,184
4/20	$16,884	$12,382
5/20	$20,109	$12,920
6/20	$22,367	$13,333
7/20	$24,241	$14,038
8/20	$25,878	$14,897
9/20	$25,336	$14,417
10/20	$25,020	$14,067
11/20	$29,478	$15,800
12/20	$31,477	$16,534
1/21	$30,965	$16,459
2/21	$32,307	$16,840
3/21	$29,889	$17,290
4/21	$30,883	$18,046
5/21	$29,664	$18,327
6/21	$32,122	$18,568
7/21	$31,815	$18,696
8/21	$32,440	$19,164
9/21	$29,766	$18,372
10/21	$31,805	$19,310
11/21	$29,654	$18,845
12/21	$26,711	$19,599
1/22	$20,398	$18,637
2/22	$20,554	$18,155
3/22	$18,854	$18,548
4/22	$14,795	$17,064
5/22	$12,991	$17,084
6/22	$11,916	$15,644
7/22	$13,668	$16,736
8/22	$13,564	$16,120
9/22	$12,384	$14,577
10/22	$12,696	$15,456
11/22	$12,627	$16,655
12/22	$11,201	$16,000
1/23	$13,302	$17,147
2/23	$12,746	$16,655
3/23	$13,476	$17,169
4/23	$12,816	$17,416
5/23	$13,951	$17,229
6/23	$14,964	$18,229
7/23	$16,251	$18,897
8/23	$14,753	$18,369
9/23	$13,814	$17,609
10/23	$12,604	$17,080
11/23	$14,919	$18,656
12/23	$16,810	$19,552
1/24	$15,660	$19,667
2/24	$17,597	$20,511
3/24	$18,112	$21,155
4/24	$16,704	$20,457
5/24	$16,735	$21,288
6/24	$17,340	$21,762
7/24	$17,506	$22,113
8/24	$18,793	$22,674
9/24	$20,003	$23,201
10/24	$21,289	$22,680
11/24	$26,131	$23,529
12/24	$24,826	$22,972

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 4/30/15 (Inception)
Class C, with conversion to Class A after 8 years	46.49%	8.45%	9.86%
Class C, with 1% maximum contingent deferred sales charge and conversion to Class A after 8 years	45.49%	8.45%	9.86%
MSCI All Country World Net Index	17.49%	10.06%	8.98%

Performance Inception Date

Apr. 30, 2015

AssetsNet

$ 69,383,054

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 274,227

InvestmentCompanyPortfolioTurnover

54.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$69,383,054
# of Portfolio Holdings	31
Portfolio Turnover Rate	54%
Total Advisory Fees Paid	$274,227

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	2.4%
Industrials	2.6%
Investment Companies	2.8%
Health Care	6.3%
Communication Services	9.1%
Financals	12.6%
Information Technology	29.8%
Consumer Discretionary	34.4%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Tesla, Inc.	8.9%
Cloudflare, Inc.	8.2%
Global-e Online Ltd.	6.6%
Affirm Holdings, Inc.	6.3%
Shopify, Inc.	6.3%
Adyen NV	5.9%
MercadoLibre, Inc.	5.4%
DoorDash, Inc.	4.9%
Aurora Innovation, Inc.	4.5%
Trade Desk, Inc.	4.3%
Total	61.3%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000094891

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Insight Portfolio

Class Name

Class I

Trading Symbol

MIGIX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Insight Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$124	1.00%

Expenses Paid, Amount

$ 124

Expense Ratio, Percent

1.00%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World Net Index:

↑ Stock selection and average overweight in consumer discretionary, led by a position in a leading seller of used cars online in the United States

↑ Stock selection in information technology, led by a position in an enterprise analytics platform and Bitcoin developing company

↓ Stock selection in health care, where a position in an underperforming health care services provider was the largest detractor

↓ Average underweight to financials

Line Graph [Table Text Block]

	Class I	MSCI All Country World Net Index
12/14	$1,000,000	$1,000,000
1/15	$1,010,989	$984,369
2/15	$1,064,364	$1,039,171
3/15	$1,056,515	$1,023,066
4/15	$1,062,009	$1,052,752
5/15	$1,058,085	$1,051,379
6/15	$1,050,235	$1,026,626
7/15	$1,081,411	$1,035,542
8/15	$1,002,107	$964,555
9/15	$970,065	$929,611
10/15	$1,054,175	$1,002,568
11/15	$1,063,788	$994,291
12/15	$1,038,522	$976,361
1/16	$967,943	$917,476
2/16	$931,813	$911,160
3/16	$989,789	$978,686
4/16	$998,191	$993,133
5/16	$1,010,795	$994,387
6/16	$1,007,434	$988,364
7/16	$1,060,792	$1,030,959
8/16	$1,069,285	$1,034,426
9/16	$1,087,970	$1,040,765
10/16	$1,064,190	$1,023,101
11/16	$1,039,560	$1,030,876
12/16	$1,040,741	$1,053,144
1/17	$1,094,839	$1,081,941
2/17	$1,122,318	$1,112,291
3/17	$1,159,242	$1,125,898
4/17	$1,227,938	$1,143,445
5/17	$1,288,046	$1,168,695
6/17	$1,279,459	$1,174,010
7/17	$1,334,416	$1,206,819
8/17	$1,358,460	$1,211,443
9/17	$1,354,166	$1,234,848
10/17	$1,393,666	$1,260,490
11/17	$1,438,318	$1,284,891
12/17	$1,473,256	$1,305,605
1/18	$1,589,741	$1,379,263
2/18	$1,554,414	$1,321,337
3/18	$1,520,041	$1,293,051
4/18	$1,554,414	$1,305,399
5/18	$1,591,651	$1,307,029
6/18	$1,599,289	$1,299,951
7/18	$1,584,913	$1,339,153
8/18	$1,631,557	$1,349,674
9/18	$1,627,670	$1,355,548
10/18	$1,460,530	$1,253,965
11/18	$1,493,005	$1,272,304
12/18	$1,388,564	$1,182,690
1/19	$1,532,792	$1,276,075
2/19	$1,620,323	$1,310,206
3/19	$1,674,035	$1,326,684
4/19	$1,747,641	$1,371,480
5/19	$1,680,998	$1,290,125
6/19	$1,783,449	$1,374,602
7/19	$1,801,354	$1,378,630
8/19	$1,738,689	$1,345,925
9/19	$1,698,902	$1,374,246
10/19	$1,714,817	$1,411,857
11/19	$1,804,338	$1,446,323
12/19	$1,825,803	$1,497,255
1/20	$1,910,180	$1,480,717
2/20	$1,817,670	$1,361,120
3/20	$1,595,036	$1,177,364
4/20	$1,896,965	$1,303,489
5/20	$2,260,905	$1,360,179
6/20	$2,517,087	$1,403,640
7/20	$2,730,572	$1,477,875
8/20	$2,916,609	$1,568,328
9/20	$2,857,646	$1,517,760
10/20	$2,825,115	$1,480,866
11/20	$3,331,379	$1,663,401
12/20	$3,559,865	$1,740,632
1/21	$3,504,095	$1,732,716
2/21	$3,658,780	$1,772,851
3/21	$3,388,344	$1,820,203
4/21	$3,504,095	$1,899,787
5/21	$3,369,403	$1,929,352
6/21	$3,650,362	$1,954,776
7/21	$3,618,793	$1,968,246
8/21	$3,693,505	$2,017,510
9/21	$3,392,553	$1,934,167
10/21	$3,628,264	$2,032,894
11/21	$3,385,187	$1,983,941
12/21	$3,052,559	$2,063,299
1/22	$2,332,741	$1,961,966
2/22	$2,352,736	$1,911,293
3/22	$2,161,118	$1,952,690
4/22	$1,696,236	$1,796,393
5/22	$1,491,288	$1,798,496
6/22	$1,369,652	$1,646,889
7/22	$1,571,268	$1,761,895
8/22	$1,562,937	$1,697,031
9/22	$1,426,305	$1,534,576
10/22	$1,464,628	$1,627,183
11/22	$1,456,297	$1,753,393
12/22	$1,292,622	$1,684,395
1/23	$1,537,803	$1,805,127
2/23	$1,474,423	$1,753,392
3/23	$1,559,486	$1,807,454
4/23	$1,484,431	$1,833,431
5/23	$1,614,527	$1,813,794
6/23	$1,732,948	$1,919,105
7/23	$1,883,059	$1,989,360
8/23	$1,709,597	$1,933,769
9/23	$1,601,184	$1,853,806
10/23	$1,461,080	$1,798,068
11/23	$1,731,280	$1,964,022
12/23	$1,949,775	$2,058,362
1/24	$1,818,011	$2,070,429
2/24	$2,043,177	$2,159,278
3/24	$2,103,221	$2,227,072
4/24	$1,941,435	$2,153,594
5/24	$1,943,103	$2,241,060
6/24	$2,014,823	$2,290,973
7/24	$2,034,837	$2,327,921
8/24	$2,184,948	$2,387,042
9/24	$2,325,052	$2,442,495
10/24	$2,476,831	$2,387,669
11/24	$3,040,581	$2,476,977
12/24	$2,888,169	$2,418,342

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class I	48.13%	9.61%	11.19%
MSCI All Country World Net Index	17.49%	10.06%	9.23%

AssetsNet

$ 69,383,054

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 274,227

InvestmentCompanyPortfolioTurnover

54.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$69,383,054
# of Portfolio Holdings	31
Portfolio Turnover Rate	54%
Total Advisory Fees Paid	$274,227

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	2.4%
Industrials	2.6%
Investment Companies	2.8%
Health Care	6.3%
Communication Services	9.1%
Financals	12.6%
Information Technology	29.8%
Consumer Discretionary	34.4%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Tesla, Inc.	8.9%
Cloudflare, Inc.	8.2%
Global-e Online Ltd.	6.6%
Affirm Holdings, Inc.	6.3%
Shopify, Inc.	6.3%
Adyen NV	5.9%
MercadoLibre, Inc.	5.4%
DoorDash, Inc.	4.9%
Aurora Innovation, Inc.	4.5%
Trade Desk, Inc.	4.3%
Total	61.3%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000094892

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Insight Portfolio

Class Name

Class L

Trading Symbol

MIGLX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Insight Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$228	1.85%

Expenses Paid, Amount

$ 228

Expense Ratio, Percent

1.85%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World Net Index:

↑ Stock selection and average overweight in consumer discretionary, led by a position in a leading seller of used cars online in the United States

↑ Stock selection in information technology, led by a position in an enterprise analytics platform and Bitcoin developing company

↓ Stock selection in health care, where a position in an underperforming health care services provider was the largest detractor

↓ Average underweight to financials

Line Graph [Table Text Block]

	Class L	MSCI All Country World Net Index
12/14	$10,000	$10,000
1/15	$10,104	$9,844
2/15	$10,621	$10,392
3/15	$10,541	$10,231
4/15	$10,589	$10,528
5/15	$10,541	$10,514
6/15	$10,454	$10,266
7/15	$10,754	$10,355
8/15	$9,960	$9,646
9/15	$9,635	$9,296
10/15	$10,462	$10,026
11/15	$10,552	$9,943
12/15	$10,296	$9,764
1/16	$9,581	$9,175
2/16	$9,223	$9,112
3/16	$9,785	$9,787
4/16	$9,862	$9,931
5/16	$9,981	$9,944
6/16	$9,938	$9,884
7/16	$10,462	$10,310
8/16	$10,540	$10,344
9/16	$10,712	$10,408
10/16	$10,471	$10,231
11/16	$10,221	$10,309
12/16	$10,224	$10,531
1/17	$10,747	$10,819
2/17	$11,017	$11,123
3/17	$11,365	$11,259
4/17	$12,036	$11,434
5/17	$12,611	$11,687
6/17	$12,524	$11,740
7/17	$13,046	$12,068
8/17	$13,272	$12,114
9/17	$13,220	$12,348
10/17	$13,603	$12,605
11/17	$14,021	$12,849
12/17	$14,348	$13,056
1/18	$15,487	$13,793
2/18	$15,127	$13,213
3/18	$14,776	$12,931
4/18	$15,107	$13,054
5/18	$15,448	$13,070
6/18	$15,516	$13,000
7/18	$15,369	$13,392
8/18	$15,805	$13,497
9/18	$15,756	$13,555
10/18	$14,131	$12,540
11/18	$14,432	$12,723
12/18	$13,416	$11,827
1/19	$14,797	$12,761
2/19	$15,630	$13,102
3/19	$16,138	$13,267
4/19	$16,839	$13,715
5/19	$16,179	$12,901
6/19	$17,154	$13,746
7/19	$17,316	$13,786
8/19	$16,697	$13,459
9/19	$16,311	$13,742
10/19	$16,453	$14,119
11/19	$17,296	$14,463
12/19	$17,484	$14,973
1/20	$18,285	$14,807
2/20	$17,391	$13,611
3/20	$15,249	$11,774
4/20	$18,118	$13,035
5/20	$21,580	$13,602
6/20	$24,012	$14,036
7/20	$26,019	$14,779
8/20	$27,786	$15,683
9/20	$27,204	$15,178
10/20	$26,871	$14,809
11/20	$31,663	$16,634
12/20	$33,812	$17,406
1/21	$33,251	$17,327
2/21	$34,697	$17,729
3/21	$32,107	$18,202
4/21	$33,175	$18,998
5/21	$31,881	$19,294
6/21	$34,524	$19,548
7/21	$34,200	$19,682
8/21	$34,880	$20,175
9/21	$32,010	$19,342
10/21	$34,211	$20,329
11/21	$31,891	$19,839
12/21	$28,753	$20,633
1/22	$21,947	$19,620
2/22	$22,127	$19,113
3/22	$20,291	$19,527
4/22	$15,934	$17,964
5/22	$13,989	$17,985
6/22	$12,837	$16,469
7/22	$14,728	$17,619
8/22	$14,638	$16,970
9/22	$13,359	$15,346
10/22	$13,683	$16,272
11/22	$13,611	$17,534
12/22	$12,059	$16,844
1/23	$14,348	$18,051
2/23	$13,753	$17,534
3/23	$14,528	$18,075
4/23	$13,825	$18,334
5/23	$15,033	$18,138
6/23	$16,114	$19,191
7/23	$17,502	$19,894
8/23	$15,880	$19,338
9/23	$14,871	$18,538
10/23	$13,537	$17,981
11/23	$16,024	$19,640
12/23	$18,061	$20,584
1/24	$16,817	$20,704
2/24	$18,890	$21,593
3/24	$19,431	$22,271
4/24	$17,917	$21,536
5/24	$17,935	$22,411
6/24	$18,584	$22,910
7/24	$18,746	$23,279
8/24	$20,116	$23,870
9/24	$21,396	$24,425
10/24	$22,784	$23,877
11/24	$27,939	$24,770
12/24	$26,523	$24,183

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class L	46.85%	8.69%	10.25%
MSCI All Country World Net Index	17.49%	10.06%	9.23%

AssetsNet

$ 69,383,054

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 274,227

InvestmentCompanyPortfolioTurnover

54.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$69,383,054
# of Portfolio Holdings	31
Portfolio Turnover Rate	54%
Total Advisory Fees Paid	$274,227

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	2.4%
Industrials	2.6%
Investment Companies	2.8%
Health Care	6.3%
Communication Services	9.1%
Financals	12.6%
Information Technology	29.8%
Consumer Discretionary	34.4%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Tesla, Inc.	8.9%
Cloudflare, Inc.	8.2%
Global-e Online Ltd.	6.6%
Affirm Holdings, Inc.	6.3%
Shopify, Inc.	6.3%
Adyen NV	5.9%
MercadoLibre, Inc.	5.4%
DoorDash, Inc.	4.9%
Aurora Innovation, Inc.	4.5%
Trade Desk, Inc.	4.3%
Total	61.3%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000228507

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Insight Portfolio

Class Name

Class R6

Trading Symbol

MGZZX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Insight Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$118	0.95%

Expenses Paid, Amount

$ 118

Expense Ratio, Percent

0.95%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World Net Index:

↑ Stock selection and average overweight in consumer discretionary, led by a position in a leading seller of used cars online in the United States

↑ Stock selection in information technology, led by a position in an enterprise analytics platform and Bitcoin developing company

↓ Stock selection in health care, where a position in an underperforming health care services provider was the largest detractor

↓ Average underweight to financials

Line Graph [Table Text Block]

	Class R6	MSCI All Country World Net Index
6/21	$5,000,000	$5,000,000
6/21	$5,194,669	$5,000,000
7/21	$5,149,745	$5,029,961
8/21	$5,256,065	$5,155,858
9/21	$4,827,793	$4,942,870
10/21	$5,163,223	$5,195,172
11/21	$4,817,311	$5,070,070
12/21	$4,344,401	$5,272,875
1/22	$3,318,838	$5,013,912
2/22	$3,347,325	$4,884,416
3/22	$3,074,317	$4,990,208
4/22	$2,414,348	$4,590,782
5/22	$2,122,347	$4,596,155
6/22	$1,949,046	$4,208,716
7/22	$2,236,298	$4,502,621
8/22	$2,224,428	$4,336,857
9/22	$2,032,135	$3,921,693
10/22	$2,084,363	$4,158,356
11/22	$2,074,867	$4,480,892
12/22	$1,839,296	$4,304,564
1/23	$2,188,620	$4,613,102
2/23	$2,100,695	$4,480,890
3/23	$2,219,513	$4,619,048
4/23	$2,112,577	$4,685,435
5/23	$2,300,308	$4,635,252
6/23	$2,469,029	$4,904,379
7/23	$2,682,901	$5,083,918
8/23	$2,433,384	$4,941,854
9/23	$2,281,298	$4,737,504
10/23	$2,079,308	$4,595,062
11/23	$2,464,277	$5,019,167
12/23	$2,777,955	$5,260,258
1/24	$2,587,847	$5,291,095
2/24	$2,911,031	$5,518,153
3/24	$2,994,203	$5,691,406
4/24	$2,763,697	$5,503,630
5/24	$2,768,450	$5,727,152
6/24	$2,868,257	$5,854,708
7/24	$2,896,773	$5,949,130
8/24	$3,110,644	$6,100,217
9/24	$3,312,634	$6,241,931
10/24	$3,526,506	$6,101,820
11/24	$4,329,713	$6,330,050
12/24	$4,114,296	$6,180,208

Average Annual Return [Table Text Block]

AATR	1 Year	Since 6/14/21 (Inception)
Class R6	48.11%	(5.35)%
MSCI All Country World Net Index	17.49%	6.16%

Performance Inception Date

Jun. 14, 2021

AssetsNet

$ 69,383,054

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 274,227

InvestmentCompanyPortfolioTurnover

54.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$69,383,054
# of Portfolio Holdings	31
Portfolio Turnover Rate	54%
Total Advisory Fees Paid	$274,227

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	2.4%
Industrials	2.6%
Investment Companies	2.8%
Health Care	6.3%
Communication Services	9.1%
Financals	12.6%
Information Technology	29.8%
Consumer Discretionary	34.4%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Tesla, Inc.	8.9%
Cloudflare, Inc.	8.2%
Global-e Online Ltd.	6.6%
Affirm Holdings, Inc.	6.3%
Shopify, Inc.	6.3%
Adyen NV	5.9%
MercadoLibre, Inc.	5.4%
DoorDash, Inc.	4.9%
Aurora Innovation, Inc.	4.5%
Trade Desk, Inc.	4.3%
Total	61.3%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000085100

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Opportunity Portfolio

Class Name

Class A

Trading Symbol

MGGPX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Opportunity Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$139	1.22%

Expenses Paid, Amount

$ 139

Expense Ratio, Percent

1.22%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World Net Index:

↑ Stock selection in consumer discretionary, led by a holding in an online food delivery platform

↑ Stock selection in communication services, led by a social network, which was the largest positive contributor in the portfolio

↑ No exposure to health care

↓ Stock selection in financials, where exposure to an Indian private sector bank was the main detractor

↓ Stock selection and an underweight allocation to information technology, where a holding in a creative cloud software company was the main detractor

↓ Stock selection in industrials

Line Graph [Table Text Block]

	Class A with maximum sales charge	MSCI All Country World Net Index
12/14	$9,476	$10,000
1/15	$9,703	$9,844
2/15	$10,207	$10,392
3/15	$10,207	$10,231
4/15	$10,614	$10,528
5/15	$10,710	$10,514
6/15	$10,876	$10,266
7/15	$11,106	$10,355
8/15	$10,330	$9,646
9/15	$10,136	$9,296
10/15	$11,175	$10,026
11/15	$11,341	$9,943
12/15	$11,197	$9,764
1/16	$10,666	$9,175
2/16	$10,156	$9,112
3/16	$10,771	$9,787
4/16	$10,932	$9,931
5/16	$11,197	$9,944
6/16	$10,932	$9,884
7/16	$11,625	$10,310
8/16	$11,633	$10,344
9/16	$11,879	$10,408
10/16	$11,797	$10,231
11/16	$11,386	$10,309
12/16	$11,267	$10,531
1/17	$11,920	$10,819
2/17	$12,423	$11,123
3/17	$13,053	$11,259
4/17	$13,601	$11,434
5/17	$14,307	$11,687
6/17	$14,254	$11,740
7/17	$15,223	$12,068
8/17	$15,493	$12,114
9/17	$15,756	$12,348
10/17	$16,183	$12,605
11/17	$16,394	$12,849
12/17	$16,791	$13,056
1/18	$18,185	$13,793
2/18	$17,831	$13,213
3/18	$17,710	$12,931
4/18	$17,996	$13,054
5/18	$19,082	$13,070
6/18	$18,863	$13,000
7/18	$18,642	$13,392
8/18	$18,908	$13,497
9/18	$18,657	$13,555
10/18	$16,586	$12,540
11/18	$16,844	$12,723
12/18	$15,789	$11,827
1/19	$17,443	$12,761
2/19	$17,967	$13,102
3/19	$18,687	$13,267
4/19	$19,621	$13,715
5/19	$18,703	$12,901
6/19	$19,848	$13,746
7/19	$19,697	$13,786
8/19	$19,454	$13,459
9/19	$19,143	$13,742
10/19	$19,818	$14,119
11/19	$20,812	$14,463
12/19	$21,320	$14,973
1/20	$21,738	$14,807
2/20	$20,782	$13,611
3/20	$18,809	$11,774
4/20	$21,206	$13,035
5/20	$23,043	$13,602
6/20	$24,750	$14,036
7/20	$26,427	$14,779
8/20	$29,484	$15,683
9/20	$29,355	$15,178
10/20	$28,786	$14,809
11/20	$31,950	$16,634
12/20	$33,053	$17,406
1/21	$32,646	$17,327
2/21	$33,844	$17,729
3/21	$32,631	$18,202
4/21	$34,574	$18,998
5/21	$33,998	$19,294
6/21	$35,157	$19,548
7/21	$34,205	$19,682
8/21	$34,927	$20,175
9/21	$33,322	$19,342
10/21	$35,042	$20,329
11/21	$33,022	$19,839
12/21	$33,035	$20,633
1/22	$29,413	$19,620
2/22	$27,150	$19,113
3/22	$26,317	$19,527
4/22	$22,371	$17,964
5/22	$21,239	$17,985
6/22	$19,105	$16,469
7/22	$21,320	$17,619
8/22	$20,787	$16,970
9/22	$18,329	$15,346
10/22	$18,976	$16,272
11/22	$20,754	$17,534
12/22	$19,246	$16,844
1/23	$22,396	$18,051
2/23	$21,774	$17,534
3/23	$23,198	$18,075
4/23	$23,328	$18,334
5/23	$24,201	$18,138
6/23	$25,826	$19,191
7/23	$27,170	$19,894
8/23	$26,227	$19,338
9/23	$24,542	$18,538
10/23	$23,900	$17,981
11/23	$27,441	$19,640
12/23	$28,733	$20,584
1/24	$29,297	$20,704
2/24	$32,005	$21,593
3/24	$32,334	$22,271
4/24	$30,702	$21,536
5/24	$30,856	$22,411
6/24	$32,087	$22,910
7/24	$31,338	$23,279
8/24	$33,329	$23,870
9/24	$35,185	$24,425
10/24	$35,575	$23,877
11/24	$37,688	$24,770
12/24	$36,517	$24,183

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class A	27.09%	11.36%	14.44%
Class A, with 5.25% maximum front end sales charge	20.43%	10.17%	13.83%
MSCI All Country World Net Index	17.49%	10.06%	9.23%

AssetsNet

$ 3,093,035,628

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 22,188,836

InvestmentCompanyPortfolioTurnover

19.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$3,093,035,628
# of Portfolio Holdings	36
Portfolio Turnover Rate	19%
Total Advisory Fees Paid	$22,188,836

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	5.3%
Industrials	14.0%
Communication Services	15.1%
Information Technology	17.4%
Financials	18.0%
Consumer Discretionary	30.2%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

ServiceNow, Inc.	6.9%
Meta Platforms, Inc.	6.8%
DSV AS	4.8%
Uber Technologies, Inc.	4.8%
DoorDash, Inc.	4.6%
MercadoLibre, Inc.	4.4%
Amazon.com, Inc.	4.4%
Spotify Technology SA	4.0%
Schneider Electric SE	3.6%
ICICI Bank Ltd.	3.4%
Total	47.7%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155900

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Opportunity Portfolio

Class Name

Class C

Trading Symbol

MSOPX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Opportunity Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$219	1.94%

Expenses Paid, Amount

$ 219

Expense Ratio, Percent

1.94%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World Net Index:

↑ Stock selection in consumer discretionary, led by a holding in an online food delivery platform

↑ Stock selection in communication services, led by a social network, which was the largest positive contributor in the portfolio

↑ No exposure to health care

↓ Stock selection in financials, where exposure to an Indian private sector bank was the main detractor

↓ Stock selection and an underweight allocation to information technology, where a holding in a creative cloud software company was the main detractor

↓ Stock selection in industrials

Line Graph [Table Text Block]

	Class C	MSCI All Country World Net Index
4/15	$10,000	$10,000
5/15	$10,085	$9,987
6/15	$10,236	$9,752
7/15	$10,448	$9,837
8/15	$9,710	$9,162
9/15	$9,519	$8,830
10/15	$10,494	$9,523
11/15	$10,639	$9,445
12/15	$10,495	$9,274
1/16	$9,990	$8,715
2/16	$9,512	$8,655
3/16	$10,090	$9,296
4/16	$10,230	$9,434
5/16	$10,475	$9,446
6/16	$10,216	$9,388
7/16	$10,855	$9,793
8/16	$10,855	$9,826
9/16	$11,090	$9,886
10/16	$10,998	$9,718
11/16	$10,607	$9,792
12/16	$10,500	$10,004
1/17	$11,093	$10,277
2/17	$11,558	$10,566
3/17	$12,137	$10,695
4/17	$12,637	$10,861
5/17	$13,288	$11,101
6/17	$13,230	$11,152
7/17	$14,117	$11,463
8/17	$14,360	$11,507
9/17	$14,603	$11,730
10/17	$14,989	$11,973
11/17	$15,168	$12,205
12/17	$15,531	$12,402
1/18	$16,816	$13,101
2/18	$16,471	$12,551
3/18	$16,357	$12,283
4/18	$16,615	$12,400
5/18	$17,605	$12,415
6/18	$17,390	$12,348
7/18	$17,172	$12,720
8/18	$17,404	$12,820
9/18	$17,172	$12,876
10/18	$15,257	$11,911
11/18	$15,488	$12,086
12/18	$14,505	$11,234
1/19	$16,016	$12,121
2/19	$16,486	$12,446
3/19	$17,136	$12,602
4/19	$17,989	$13,028
5/19	$17,136	$12,255
6/19	$18,177	$13,057
7/19	$18,018	$13,095
8/19	$17,787	$12,785
9/19	$17,490	$13,054
10/19	$18,097	$13,411
11/19	$18,994	$13,738
12/19	$19,442	$14,222
1/20	$19,817	$14,065
2/20	$18,929	$12,929
3/20	$17,129	$11,184
4/20	$19,297	$12,382
5/20	$20,959	$12,920
6/20	$22,499	$13,333
7/20	$24,009	$14,038
8/20	$26,763	$14,897
9/20	$26,640	$14,417
10/20	$26,098	$14,067
11/20	$28,953	$15,800
12/20	$29,938	$16,534
1/21	$29,551	$16,459
2/21	$30,619	$16,840
3/21	$29,499	$17,290
4/21	$31,241	$18,046
5/21	$30,700	$18,327
6/21	$31,732	$18,568
7/21	$30,846	$18,696
8/21	$31,483	$19,164
9/21	$30,019	$18,372
10/21	$31,556	$19,310
11/21	$29,719	$18,845
12/21	$29,709	$19,599
1/22	$26,439	$18,637
2/22	$24,390	$18,155
3/22	$23,625	$18,548
4/22	$20,077	$17,064
5/22	$19,041	$17,084
6/22	$17,124	$15,644
7/22	$19,095	$16,736
8/22	$18,608	$16,120
9/22	$16,397	$14,577
10/22	$16,961	$15,456
11/22	$18,546	$16,655
12/22	$17,188	$16,000
1/23	$19,987	$17,147
2/23	$19,422	$16,655
3/23	$20,680	$17,169
4/23	$20,778	$17,416
5/23	$21,555	$17,229
6/23	$23,002	$18,229
7/23	$24,199	$18,897
8/23	$23,359	$18,369
9/23	$21,858	$17,609
10/23	$21,287	$17,080
11/23	$24,440	$18,656
12/23	$25,591	$19,552
1/24	$26,094	$19,667
2/24	$28,506	$20,511
3/24	$28,798	$21,155
4/24	$27,345	$20,457
5/24	$27,482	$21,288
6/24	$28,579	$21,762
7/24	$27,912	$22,113
8/24	$29,684	$22,674
9/24	$31,338	$23,201
10/24	$31,685	$22,680
11/24	$33,567	$23,529
12/24	$32,524	$22,972

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 4/30/15 (Inception)
Class C, with conversion to Class A after 8 years	26.16%	10.58%	12.97%
Class C, with 1% maximum contingent deferred sales charge and conversion to Class A after 8 years	25.16%	10.58%	12.97%
MSCI All Country World Net Index	17.49%	10.06%	8.98%

Performance Inception Date

Apr. 30, 2015

AssetsNet

$ 3,093,035,628

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 22,188,836

InvestmentCompanyPortfolioTurnover

19.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$3,093,035,628
# of Portfolio Holdings	36
Portfolio Turnover Rate	19%
Total Advisory Fees Paid	$22,188,836

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	5.3%
Industrials	14.0%
Communication Services	15.1%
Information Technology	17.4%
Financials	18.0%
Consumer Discretionary	30.2%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

ServiceNow, Inc.	6.9%
Meta Platforms, Inc.	6.8%
DSV AS	4.8%
Uber Technologies, Inc.	4.8%
DoorDash, Inc.	4.6%
MercadoLibre, Inc.	4.4%
Amazon.com, Inc.	4.4%
Spotify Technology SA	4.0%
Schneider Electric SE	3.6%
ICICI Bank Ltd.	3.4%
Total	47.7%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000085098

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Opportunity Portfolio

Class Name

Class I

Trading Symbol

MGGIX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Opportunity Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$106	0.93%

Expenses Paid, Amount

$ 106

Expense Ratio, Percent

0.93%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World Net Index:

↑ Stock selection in consumer discretionary, led by a holding in an online food delivery platform

↑ Stock selection in communication services, led by a social network, which was the largest positive contributor in the portfolio

↑ No exposure to health care

↓ Stock selection in financials, where exposure to an Indian private sector bank was the main detractor

↓ Stock selection and an underweight allocation to information technology, where a holding in a creative cloud software company was the main detractor

↓ Stock selection in industrials

Line Graph [Table Text Block]

	Class I	MSCI All Country World Net Index
12/14	$1,000,000	$1,000,000
1/15	$1,024,320	$984,369
2/15	$1,077,253	$1,039,171
3/15	$1,077,969	$1,023,066
4/15	$1,120,887	$1,052,752
5/15	$1,130,901	$1,051,379
6/15	$1,149,499	$1,026,626
7/15	$1,174,057	$1,035,542
8/15	$1,092,146	$964,555
9/15	$1,072,027	$929,611
10/15	$1,181,960	$1,002,568
11/15	$1,199,923	$994,291
12/15	$1,184,973	$976,361
1/16	$1,129,201	$917,476
2/16	$1,075,602	$911,160
3/16	$1,141,514	$978,686
4/16	$1,158,898	$993,133
5/16	$1,187,146	$994,387
6/16	$1,159,622	$988,364
7/16	$1,232,967	$1,030,959
8/16	$1,233,740	$1,034,426
9/16	$1,261,569	$1,040,765
10/16	$1,252,292	$1,023,101
11/16	$1,209,003	$1,030,876
12/16	$1,197,416	$1,053,144
1/17	$1,266,573	$1,081,941
2/17	$1,320,965	$1,112,291
3/17	$1,387,791	$1,125,898
4/17	$1,446,069	$1,143,445
5/17	$1,522,218	$1,168,695
6/17	$1,516,779	$1,174,010
7/17	$1,620,125	$1,206,819
8/17	$1,649,653	$1,211,443
9/17	$1,678,403	$1,234,848
10/17	$1,724,248	$1,260,490
11/17	$1,746,783	$1,284,891
12/17	$1,789,439	$1,305,605
1/18	$1,939,209	$1,379,263
2/18	$1,900,986	$1,321,337
3/18	$1,889,285	$1,293,051
4/18	$1,920,487	$1,305,399
5/18	$2,036,715	$1,307,029
6/18	$2,014,094	$1,299,951
7/18	$1,990,418	$1,339,153
8/18	$2,019,469	$1,349,674
9/18	$1,993,558	$1,355,548
10/18	$1,772,924	$1,253,965
11/18	$1,801,190	$1,272,304
12/18	$1,688,125	$1,182,690
1/19	$1,865,575	$1,276,075
2/19	$1,922,107	$1,310,206
3/19	$1,999,840	$1,326,684
4/19	$2,100,342	$1,371,480
5/19	$2,002,980	$1,290,125
6/19	$2,126,253	$1,374,602
7/19	$2,109,764	$1,378,630
8/19	$2,084,638	$1,345,925
9/19	$2,051,661	$1,374,246
10/19	$2,124,682	$1,411,857
11/19	$2,231,466	$1,446,323
12/19	$2,286,428	$1,497,255
1/20	$2,331,968	$1,480,717
2/20	$2,229,111	$1,361,120
3/20	$2,018,684	$1,177,364
4/20	$2,277,006	$1,303,489
5/20	$2,474,870	$1,360,179
6/20	$2,657,816	$1,403,640
7/20	$2,839,191	$1,477,875
8/20	$3,168,179	$1,568,328
9/20	$3,155,617	$1,517,760
10/20	$3,094,373	$1,480,866
11/20	$3,435,139	$1,663,401
12/20	$3,554,776	$1,740,632
1/21	$3,511,880	$1,732,716
2/21	$3,641,362	$1,772,851
3/21	$3,511,880	$1,820,203
4/21	$3,721,592	$1,899,787
5/21	$3,660,426	$1,929,352
6/21	$3,785,936	$1,954,776
7/21	$3,684,257	$1,968,246
8/21	$3,763,694	$2,017,510
9/21	$3,591,317	$1,934,167
10/21	$3,777,992	$2,032,894
11/21	$3,561,131	$1,983,941
12/21	$3,562,505	$2,063,299
1/22	$3,173,626	$1,961,966
2/22	$2,929,115	$1,911,293
3/22	$2,839,823	$1,952,690
4/22	$2,415,060	$1,796,393
5/22	$2,293,222	$1,798,496
6/22	$2,063,733	$1,646,889
7/22	$2,303,236	$1,761,895
8/22	$2,246,490	$1,697,031
9/22	$1,981,117	$1,534,576
10/22	$2,051,215	$1,627,183
11/22	$2,243,986	$1,753,393
12/22	$2,082,749	$1,684,395
1/23	$2,422,706	$1,805,127
2/23	$2,356,148	$1,753,392
3/23	$2,510,767	$1,807,454
4/23	$2,525,103	$1,833,431
5/23	$2,620,332	$1,813,794
6/23	$2,798,502	$1,919,105
7/23	$2,943,905	$1,989,360
8/23	$2,842,533	$1,933,769
9/23	$2,661,290	$1,853,806
10/23	$2,591,661	$1,798,068
11/23	$2,975,648	$1,964,022
12/23	$3,117,859	$2,058,362
1/24	$3,179,567	$2,070,429
2/24	$3,474,514	$2,159,278
3/24	$3,511,121	$2,227,072
4/24	$3,333,316	$2,153,594
5/24	$3,352,143	$2,241,060
6/24	$3,486,019	$2,290,973
7/24	$3,406,530	$2,327,921
8/24	$3,623,033	$2,387,042
9/24	$3,825,940	$2,442,495
10/24	$3,868,822	$2,387,669
11/24	$4,099,969	$2,476,977
12/24	$3,973,129	$2,418,342

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class I	27.43%	11.69%	14.79%
MSCI All Country World Net Index	17.49%	10.06%	9.23%

AssetsNet

$ 3,093,035,628

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 22,188,836

InvestmentCompanyPortfolioTurnover

19.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$3,093,035,628
# of Portfolio Holdings	36
Portfolio Turnover Rate	19%
Total Advisory Fees Paid	$22,188,836

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	5.3%
Industrials	14.0%
Communication Services	15.1%
Information Technology	17.4%
Financials	18.0%
Consumer Discretionary	30.2%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

ServiceNow, Inc.	6.9%
Meta Platforms, Inc.	6.8%
DSV AS	4.8%
Uber Technologies, Inc.	4.8%
DoorDash, Inc.	4.6%
MercadoLibre, Inc.	4.4%
Amazon.com, Inc.	4.4%
Spotify Technology SA	4.0%
Schneider Electric SE	3.6%
ICICI Bank Ltd.	3.4%
Total	47.7%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000198822

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Opportunity Portfolio

Class Name

Class IR

Trading Symbol

MGORX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Opportunity Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class IR	$97	0.85%

Expenses Paid, Amount

$ 97

Expense Ratio, Percent

0.85%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World Net Index:

↑ Stock selection in consumer discretionary, led by a holding in an online food delivery platform

↑ Stock selection in communication services, led by a social network, which was the largest positive contributor in the portfolio

↑ No exposure to health care

↓ Stock selection in financials, where exposure to an Indian private sector bank was the main detractor

↓ Stock selection and an underweight allocation to information technology, where a holding in a creative cloud software company was the main detractor

↓ Stock selection in industrials

Line Graph [Table Text Block]

	Class IR	MSCI All Country World Net Index
6/18	$5,000,000	$5,000,000
6/18	$4,850,019	$5,000,000
7/18	$4,795,004	$5,035,219
8/18	$4,864,825	$5,074,777
9/18	$4,802,553	$5,096,864
10/18	$4,270,403	$4,714,910
11/18	$4,340,224	$4,783,868
12/18	$4,068,489	$4,446,918
1/19	$4,496,850	$4,798,045
2/19	$4,632,718	$4,926,379
3/19	$4,819,536	$4,988,333
4/19	$5,062,966	$5,156,768
5/19	$4,827,084	$4,850,873
6/19	$5,125,239	$5,168,506
7/19	$5,085,611	$5,183,651
8/19	$5,025,225	$5,060,683
9/19	$4,945,969	$5,167,168
10/19	$5,123,352	$5,308,586
11/19	$5,381,878	$5,438,177
12/19	$5,513,972	$5,629,683
1/20	$5,625,308	$5,567,498
2/20	$5,378,104	$5,117,812
3/20	$4,870,487	$4,426,891
4/20	$5,493,214	$4,901,122
5/20	$5,970,639	$5,114,277
6/20	$6,414,097	$5,277,690
7/20	$6,850,006	$5,556,812
8/20	$7,644,456	$5,896,917
9/20	$7,614,263	$5,706,782
10/20	$7,468,960	$5,568,058
11/20	$8,291,716	$6,254,393
12/20	$8,583,060	$6,544,781
1/21	$8,478,062	$6,515,015
2/21	$8,793,054	$6,665,925
3/21	$8,479,971	$6,843,968
4/21	$8,987,777	$7,143,203
5/21	$8,838,872	$7,254,369
6/21	$9,144,318	$7,349,962
7/21	$8,899,961	$7,400,609
8/21	$9,090,865	$7,585,841
9/21	$8,676,603	$7,272,472
10/21	$9,127,137	$7,643,684
11/21	$8,604,059	$7,459,621
12/21	$8,609,306	$7,758,010
1/22	$7,668,979	$7,376,995
2/22	$7,079,520	$7,186,468
3/22	$6,864,989	$7,342,119
4/22	$5,838,449	$6,754,443
5/22	$5,543,719	$6,762,347
6/22	$4,990,350	$6,192,306
7/22	$5,569,784	$6,624,730
8/22	$5,433,446	$6,380,842
9/22	$4,791,859	$5,770,008
10/22	$4,960,275	$6,118,211
11/22	$5,427,432	$6,592,760
12/22	$5,035,664	$6,333,329
1/23	$5,861,022	$6,787,282
2/23	$5,698,898	$6,592,758
3/23	$6,074,731	$6,796,030
4/23	$6,109,121	$6,893,706
5/23	$6,340,024	$6,819,871
6/23	$6,769,898	$7,215,839
7/23	$7,123,623	$7,479,997
8/23	$6,877,981	$7,270,976
9/23	$6,438,281	$6,970,315
10/23	$6,271,245	$6,760,740
11/23	$7,202,228	$7,384,728
12/23	$7,545,830	$7,739,446
1/24	$7,696,345	$7,784,816
2/24	$8,411,292	$8,118,889
3/24	$8,499,093	$8,373,797
4/24	$8,070,124	$8,097,520
5/24	$8,115,279	$8,426,390
6/24	$8,441,395	$8,614,063
7/24	$8,248,234	$8,752,986
8/24	$8,775,037	$8,975,282
9/24	$9,264,212	$9,183,787
10/24	$9,369,572	$8,977,640
11/24	$9,928,987	$9,313,437
12/24	$9,619,690	$9,092,973

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 6/15/18 (Inception)
Class IR	27.48%	11.77%	10.51%
MSCI All Country World Net Index	17.49%	10.06%	9.57%

Performance Inception Date

Jun. 15, 2018

AssetsNet

$ 3,093,035,628

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 22,188,836

InvestmentCompanyPortfolioTurnover

19.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$3,093,035,628
# of Portfolio Holdings	36
Portfolio Turnover Rate	19%
Total Advisory Fees Paid	$22,188,836

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	5.3%
Industrials	14.0%
Communication Services	15.1%
Information Technology	17.4%
Financials	18.0%
Consumer Discretionary	30.2%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

ServiceNow, Inc.	6.9%
Meta Platforms, Inc.	6.8%
DSV AS	4.8%
Uber Technologies, Inc.	4.8%
DoorDash, Inc.	4.6%
MercadoLibre, Inc.	4.4%
Amazon.com, Inc.	4.4%
Spotify Technology SA	4.0%
Schneider Electric SE	3.6%
ICICI Bank Ltd.	3.4%
Total	47.7%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000085099

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Opportunity Portfolio

Class Name

Class L

Trading Symbol

MGGLX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Opportunity Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$146	1.29%

Expenses Paid, Amount

$ 146

Expense Ratio, Percent

1.29%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World Net Index:

↑ Stock selection in consumer discretionary, led by a holding in an online food delivery platform

↑ Stock selection in communication services, led by a social network, which was the largest positive contributor in the portfolio

↑ No exposure to health care

↓ Stock selection in financials, where exposure to an Indian private sector bank was the main detractor

↓ Stock selection and an underweight allocation to information technology, where a holding in a creative cloud software company was the main detractor

↓ Stock selection in industrials

Line Graph [Table Text Block]

	Class L	MSCI All Country World Net Index
12/14	$10,000	$10,000
1/15	$10,235	$9,844
2/15	$10,764	$10,392
3/15	$10,764	$10,231
4/15	$11,197	$10,528
5/15	$11,292	$10,514
6/15	$11,468	$10,266
7/15	$11,713	$10,355
8/15	$10,894	$9,646
9/15	$10,688	$9,296
10/15	$11,787	$10,026
11/15	$11,957	$9,943
12/15	$11,803	$9,764
1/16	$11,238	$9,175
2/16	$10,702	$9,112
3/16	$11,357	$9,787
4/16	$11,520	$9,931
5/16	$11,803	$9,944
6/16	$11,520	$9,884
7/16	$12,244	$10,310
8/16	$12,251	$10,344
9/16	$12,522	$10,408
10/16	$12,426	$10,231
11/16	$11,997	$10,309
12/16	$11,870	$10,531
1/17	$12,558	$10,819
2/17	$13,085	$11,123
3/17	$13,749	$11,259
4/17	$14,317	$11,434
5/17	$15,061	$11,687
6/17	$15,013	$11,740
7/17	$16,021	$12,068
8/17	$16,309	$12,114
9/17	$16,589	$12,348
10/17	$17,037	$12,605
11/17	$17,253	$12,849
12/17	$17,676	$13,056
1/18	$19,137	$13,793
2/18	$18,760	$13,213
3/18	$18,639	$12,931
4/18	$18,945	$13,054
5/18	$20,077	$13,070
6/18	$19,844	$13,000
7/18	$19,608	$13,392
8/18	$19,891	$13,497
9/18	$19,633	$13,555
10/18	$17,449	$12,540
11/18	$17,724	$12,723
12/18	$16,608	$11,827
1/19	$18,347	$12,761
2/19	$18,897	$13,102
3/19	$19,649	$13,267
4/19	$20,635	$13,715
5/19	$19,673	$12,901
6/19	$20,878	$13,746
7/19	$20,708	$13,786
8/19	$20,457	$13,459
9/19	$20,126	$13,742
10/19	$20,837	$14,119
11/19	$21,880	$14,463
12/19	$22,414	$14,973
1/20	$22,851	$14,807
2/20	$21,840	$13,611
3/20	$19,778	$11,774
4/20	$22,293	$13,035
5/20	$24,225	$13,602
6/20	$26,012	$14,036
7/20	$27,775	$14,779
8/20	$30,985	$15,683
9/20	$30,856	$15,178
10/20	$30,249	$14,809
11/20	$33,573	$16,634
12/20	$34,740	$17,406
1/21	$34,306	$17,327
2/21	$35,559	$17,729
3/21	$34,282	$18,202
4/21	$36,328	$18,998
5/21	$35,714	$19,294
6/21	$36,934	$19,548
7/21	$35,935	$19,682
8/21	$36,696	$20,175
9/21	$35,010	$19,342
10/21	$36,811	$20,329
11/21	$34,691	$19,839
12/21	$34,697	$20,633
1/22	$30,893	$19,620
2/22	$28,513	$19,113
3/22	$27,642	$19,527
4/22	$23,493	$17,964
5/22	$22,303	$17,985
6/22	$20,069	$16,469
7/22	$22,389	$17,619
8/22	$21,829	$16,970
9/22	$19,241	$15,346
10/22	$19,914	$16,272
11/22	$21,786	$17,534
12/22	$20,202	$16,844
1/23	$23,499	$18,051
2/23	$22,855	$17,534
3/23	$24,337	$18,075
4/23	$24,477	$18,334
5/23	$25,390	$18,138
6/23	$27,097	$19,191
7/23	$28,504	$19,894
8/23	$27,516	$19,338
9/23	$25,744	$18,538
10/23	$25,057	$17,981
11/23	$28,773	$19,640
12/23	$30,136	$20,584
1/24	$30,718	$20,704
2/24	$33,565	$21,593
3/24	$33,905	$22,271
4/24	$32,180	$21,536
5/24	$32,345	$22,411
6/24	$33,631	$22,910
7/24	$32,850	$23,279
8/24	$34,938	$23,870
9/24	$36,884	$24,425
10/24	$37,279	$23,877
11/24	$39,499	$24,770
12/24	$38,265	$24,183

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class L	26.98%	11.29%	14.36%
MSCI All Country World Net Index	17.49%	10.06%	9.23%

AssetsNet

$ 3,093,035,628

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 22,188,836

InvestmentCompanyPortfolioTurnover

19.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$3,093,035,628
# of Portfolio Holdings	36
Portfolio Turnover Rate	19%
Total Advisory Fees Paid	$22,188,836

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	5.3%
Industrials	14.0%
Communication Services	15.1%
Information Technology	17.4%
Financials	18.0%
Consumer Discretionary	30.2%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

ServiceNow, Inc.	6.9%
Meta Platforms, Inc.	6.8%
DSV AS	4.8%
Uber Technologies, Inc.	4.8%
DoorDash, Inc.	4.6%
MercadoLibre, Inc.	4.4%
Amazon.com, Inc.	4.4%
Spotify Technology SA	4.0%
Schneider Electric SE	3.6%
ICICI Bank Ltd.	3.4%
Total	47.7%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000126921

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Opportunity Portfolio

Class Name

Class R6

Trading Symbol

MGTSX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Opportunity Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$97	0.85%

Expenses Paid, Amount

$ 97

Expense Ratio, Percent

0.85%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World Net Index:

↑ Stock selection in consumer discretionary, led by a holding in an online food delivery platform

↑ Stock selection in communication services, led by a social network, which was the largest positive contributor in the portfolio

↑ No exposure to health care

↓ Stock selection in financials, where exposure to an Indian private sector bank was the main detractor

↓ Stock selection and an underweight allocation to information technology, where a holding in a creative cloud software company was the main detractor

↓ Stock selection in industrials

Line Graph [Table Text Block]

	Class R6	MSCI All Country World Net Index
12/14	$5,000,000	$5,000,000
1/15	$5,121,602	$4,921,847
2/15	$5,389,843	$5,195,853
3/15	$5,389,843	$5,115,328
4/15	$5,608,011	$5,263,762
5/15	$5,658,083	$5,256,895
6/15	$5,747,496	$5,133,131
7/15	$5,873,860	$5,177,710
8/15	$5,464,306	$4,822,776
9/15	$5,360,122	$4,648,053
10/15	$5,913,378	$5,012,840
11/15	$6,003,192	$4,971,453
12/15	$5,932,064	$4,881,803
1/16	$5,649,585	$4,587,378
2/16	$5,381,592	$4,555,802
3/16	$5,714,772	$4,893,431
4/16	$5,798,067	$4,965,663
5/16	$5,942,928	$4,971,937
6/16	$5,805,310	$4,941,819
7/16	$6,171,997	$5,154,794
8/16	$6,179,727	$5,172,128
9/16	$6,314,993	$5,203,826
10/16	$6,272,481	$5,115,503
11/16	$6,056,055	$5,154,379
12/16	$5,998,126	$5,265,722
1/17	$6,343,873	$5,409,704
2/17	$6,615,809	$5,561,453
3/17	$6,953,786	$5,629,489
4/17	$7,245,146	$5,717,223
5/17	$7,625,856	$5,843,475
6/17	$7,598,662	$5,870,048
7/17	$8,115,340	$6,034,097
8/17	$8,262,963	$6,057,214
9/17	$8,410,585	$6,174,239
10/17	$8,639,788	$6,302,449
11/17	$8,752,447	$6,424,454
12/17	$8,969,605	$6,528,027
1/18	$9,718,372	$6,896,316
2/18	$9,527,280	$6,606,683
3/18	$9,468,783	$6,465,255
4/18	$9,624,776	$6,526,995
5/18	$10,205,851	$6,535,144
6/18	$10,092,756	$6,499,754
7/18	$9,970,466	$6,695,765
8/18	$10,115,705	$6,748,370
9/18	$9,986,168	$6,777,740
10/18	$8,879,210	$6,269,824
11/18	$9,020,524	$6,361,522
12/18	$8,451,344	$5,913,452
1/19	$9,342,405	$6,380,376
2/19	$9,625,033	$6,551,032
3/19	$10,013,645	$6,633,418
4/19	$10,520,019	$6,857,400
5/19	$10,029,347	$6,450,625
6/19	$10,645,632	$6,873,010
7/19	$10,567,124	$6,893,149
8/19	$10,441,512	$6,729,627
9/19	$10,276,646	$6,871,229
10/19	$10,641,706	$7,059,286
11/19	$11,179,483	$7,231,614
12/19	$11,454,260	$7,486,276
1/20	$11,685,857	$7,403,583
2/20	$11,171,633	$6,805,598
3/20	$10,119,631	$5,886,819
4/20	$11,411,081	$6,517,445
5/20	$12,404,202	$6,800,896
6/20	$13,326,666	$7,018,201
7/20	$14,233,429	$7,389,373
8/20	$15,882,089	$7,841,640
9/20	$15,819,283	$7,588,801
10/20	$15,517,029	$7,404,328
11/20	$17,228,495	$8,317,007
12/20	$17,830,569	$8,703,161
1/21	$17,612,155	$8,663,579
2/21	$18,267,398	$8,864,257
3/21	$17,616,126	$9,101,015
4/21	$18,672,458	$9,498,935
5/21	$18,362,707	$9,646,761
6/21	$18,998,094	$9,773,880
7/21	$18,485,813	$9,841,229
8/21	$18,886,901	$10,087,549
9/21	$18,025,157	$9,670,834
10/21	$18,962,354	$10,164,468
11/21	$17,874,252	$9,919,703
12/21	$17,889,164	$10,316,496
1/22	$15,932,993	$9,809,828
2/22	$14,710,908	$9,556,467
3/22	$14,264,617	$9,763,451
4/22	$12,133,266	$8,981,966
5/22	$11,520,138	$8,992,478
6/22	$10,368,958	$8,234,445
7/22	$11,574,360	$8,809,477
8/22	$11,286,565	$8,485,157
9/22	$9,951,864	$7,672,878
10/22	$10,306,394	$8,135,914
11/22	$11,278,223	$8,766,963
12/22	$10,463,197	$8,421,975
1/23	$12,175,542	$9,025,635
2/23	$11,843,296	$8,766,961
3/23	$12,620,241	$9,037,269
4/23	$12,691,801	$9,167,157
5/23	$13,172,280	$9,068,972
6/23	$14,066,789	$9,595,525
7/23	$14,797,731	$9,946,798
8/23	$14,291,694	$9,668,845
9/23	$13,376,740	$9,269,031
10/23	$13,029,159	$8,990,340
11/23	$14,966,409	$9,820,111
12/23	$15,676,288	$10,291,810
1/24	$15,989,501	$10,352,143
2/24	$17,472,040	$10,796,388
3/24	$17,659,968	$11,135,361
4/24	$16,767,312	$10,767,972
5/24	$16,861,276	$11,205,299
6/24	$17,539,903	$11,454,865
7/24	$17,137,947	$11,639,603
8/24	$18,228,971	$11,935,208
9/24	$19,252,132	$12,212,476
10/24	$19,466,160	$11,938,345
11/24	$20,635,487	$12,384,883
12/24	$19,997,432	$12,091,712

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class R6	27.56%	11.79%	14.87%
MSCI All Country World Net Index	17.49%	10.06%	9.23%

AssetsNet

$ 3,093,035,628

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 22,188,836

InvestmentCompanyPortfolioTurnover

19.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$3,093,035,628
# of Portfolio Holdings	36
Portfolio Turnover Rate	19%
Total Advisory Fees Paid	$22,188,836

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	5.3%
Industrials	14.0%
Communication Services	15.1%
Information Technology	17.4%
Financials	18.0%
Consumer Discretionary	30.2%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

ServiceNow, Inc.	6.9%
Meta Platforms, Inc.	6.8%
DSV AS	4.8%
Uber Technologies, Inc.	4.8%
DoorDash, Inc.	4.6%
MercadoLibre, Inc.	4.4%
Amazon.com, Inc.	4.4%
Spotify Technology SA	4.0%
Schneider Electric SE	3.6%
ICICI Bank Ltd.	3.4%
Total	47.7%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000211166

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Permanence Portfolio

Class Name

Class A

Trading Symbol

MGKAX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Permanence Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$142	1.35%

Expenses Paid, Amount

$ 142

Expense Ratio, Percent

1.35%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World Net Index:

↓ Stock selection and an average overweight in consumer discretionary, where the largest detractor was a contemporary carpets and floor coverings company

↓ Stock selection and an average overweight in industrials, where a leading North American Class 1 freight railway was the largest detractor

↓ Stock selection and an average overweight in health care, driven by underperformance in an analytical testing and laboratory services provider

↑ Stock selection and an average underweight in energy, led by a holding in a Texas landowner

↑ Stock selection in real estate, helped by a land holding company focusing on managing land and resources to support and promote oil and natural gas production

↑ Stock selection and an average underweight in materials, driven by a precious metals streaming and royalty company

Line Graph [Table Text Block]

	Class A with maximum sales charge	MSCI All Country World Net Index
4/19	$9,479	$10,000
5/19	$9,280	$9,407
6/19	$9,801	$10,023
7/19	$9,773	$10,052
8/19	$9,858	$9,814
9/19	$9,791	$10,020
10/19	$9,839	$10,294
11/19	$10,047	$10,546
12/19	$10,057	$10,917
1/20	$10,152	$10,796
2/20	$9,431	$9,924
3/20	$8,265	$8,585
4/20	$9,412	$9,504
5/20	$10,142	$9,918
6/20	$10,483	$10,234
7/20	$10,976	$10,776
8/20	$11,412	$11,435
9/20	$11,223	$11,067
10/20	$10,957	$10,798
11/20	$12,085	$12,129
12/20	$12,729	$12,692
1/21	$12,206	$12,634
2/21	$12,863	$12,927
3/21	$13,110	$13,272
4/21	$13,881	$13,852
5/21	$13,967	$14,068
6/21	$14,338	$14,253
7/21	$14,767	$14,351
8/21	$15,034	$14,710
9/21	$14,262	$14,103
10/21	$15,272	$14,823
11/21	$14,929	$14,466
12/21	$15,182	$15,044
1/22	$13,821	$14,305
2/22	$13,419	$13,936
3/22	$13,832	$14,238
4/22	$12,393	$13,098
5/22	$12,081	$13,114
6/22	$11,456	$12,008
7/22	$12,616	$12,847
8/22	$11,746	$12,374
9/22	$10,865	$11,189
10/22	$11,746	$11,864
11/22	$12,862	$12,785
12/22	$12,129	$12,282
1/23	$13,298	$13,162
2/23	$13,105	$12,785
3/23	$13,787	$13,179
4/23	$13,696	$13,368
5/23	$13,980	$13,225
6/23	$14,457	$13,993
7/23	$15,036	$14,505
8/23	$14,354	$14,100
9/23	$13,366	$13,517
10/23	$12,537	$13,110
11/23	$13,650	$14,320
12/23	$14,605	$15,008
1/24	$14,462	$15,096
2/24	$15,920	$15,744
3/24	$16,410	$16,238
4/24	$14,964	$15,703
5/24	$15,514	$16,340
6/24	$15,227	$16,704
7/24	$15,860	$16,974
8/24	$15,836	$17,405
9/24	$15,776	$17,809
10/24	$15,406	$17,409
11/24	$16,410	$18,061
12/24	$16,120	$17,633

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 4/30/19 (Inception)
Class A	10.37%	9.90%	9.82%
Class A, with 5.25% maximum front end sales charge	4.55%	8.71%	8.78%
MSCI All Country World Net Index	17.49%	10.06%	10.52%

Performance Inception Date

Apr. 30, 2019

AssetsNet

$ 3,861,216

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 0

InvestmentCompanyPortfolioTurnover

62.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$3,861,216
# of Portfolio Holdings	48
Portfolio Turnover Rate	62%
Total Advisory Fees Paid (Net of Waivers)	$0

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Communication Services	0.1%
Energy	1.2%
Short-Term Investments	2.3%
Materials	3.0%
Investment Companies	3.7%
Real Estate	4.3%
Consumer Staples	4.7%
Financals	4.7%
Health Care	14.4%
Consumer Discretionary	18.6%
Information Technology	19.3%
Industrials	23.7%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Cloudflare, Inc.	11.0%
Royalty Pharma PLC	5.1%
Eurofins Scientific SE	5.1%
ASML Holding NV	5.1%
Babcock International Group PLC	5.1%
Rentokil Initial PLC	5.0%
LVMH Moet Hennessy Louis Vuitton SE	5.0%
Canadian National Railway Co.	5.0%
Floor & Decor Holdings, Inc.	4.7%
Core & Main, Inc.	4.7%
Total	55.8%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000211167

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Permanence Portfolio

Class Name

Class C

Trading Symbol

MGKCX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Permanence Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$220	2.10%

Expenses Paid, Amount

$ 220

Expense Ratio, Percent

2.10%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World Net Index:

↓ Stock selection and an average overweight in consumer discretionary, where the largest detractor was a contemporary carpets and floor coverings company

↓ Stock selection and an average overweight in industrials, where a leading North American Class 1 freight railway was the largest detractor

↓ Stock selection and an average overweight in health care, driven by underperformance in an analytical testing and laboratory services provider

↑ Stock selection and an average underweight in energy, led by a holding in a Texas landowner

↑ Stock selection in real estate, helped by a land holding company focusing on managing land and resources to support and promote oil and natural gas production

↑ Stock selection and an average underweight in materials, driven by a precious metals streaming and royalty company

Line Graph [Table Text Block]

	Class C	MSCI All Country World Net Index
4/19	$10,000	$10,000
5/19	$9,780	$9,407
6/19	$10,330	$10,023
7/19	$10,290	$10,052
8/19	$10,370	$9,814
9/19	$10,300	$10,020
10/19	$10,340	$10,294
11/19	$10,550	$10,546
12/19	$10,560	$10,917
1/20	$10,650	$10,796
2/20	$9,890	$9,924
3/20	$8,660	$8,585
4/20	$9,850	$9,504
5/20	$10,610	$9,918
6/20	$10,970	$10,234
7/20	$11,470	$10,776
8/20	$11,920	$11,435
9/20	$11,710	$11,067
10/20	$11,430	$10,798
11/20	$12,600	$12,129
12/20	$13,263	$12,692
1/21	$12,702	$12,634
2/21	$13,393	$12,927
3/21	$13,634	$13,272
4/21	$14,425	$13,852
5/21	$14,515	$14,068
6/21	$14,886	$14,253
7/21	$15,327	$14,351
8/21	$15,587	$14,710
9/21	$14,776	$14,103
10/21	$15,818	$14,823
11/21	$15,457	$14,466
12/21	$15,702	$15,044
1/22	$14,277	$14,305
2/22	$13,865	$13,936
3/22	$14,277	$14,238
4/22	$12,783	$13,098
5/22	$12,453	$13,114
6/22	$11,806	$12,008
7/22	$12,994	$12,847
8/22	$12,088	$12,374
9/22	$11,182	$11,189
10/22	$12,076	$11,864
11/22	$13,206	$12,785
12/22	$12,444	$12,282
1/23	$13,643	$13,162
2/23	$13,440	$12,785
3/23	$14,135	$13,179
4/23	$14,027	$13,368
5/23	$14,303	$13,225
6/23	$14,782	$13,993
7/23	$15,370	$14,505
8/23	$14,662	$14,100
9/23	$13,643	$13,517
10/23	$12,792	$13,110
11/23	$13,907	$14,320
12/23	$14,879	$15,008
1/24	$14,727	$15,096
2/24	$16,206	$15,744
3/24	$16,687	$16,238
4/24	$15,208	$15,703
5/24	$15,764	$16,340
6/24	$15,460	$16,704
7/24	$16,092	$16,974
8/24	$16,055	$17,405
9/24	$15,991	$17,809
10/24	$15,599	$17,409
11/24	$16,611	$18,061
12/24	$16,308	$17,633

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 4/30/19 (Inception)
Class C	9.60%	9.08%	9.01%
Class C, with 1% maximum contingent deferred sales charge	8.70%	9.08%	9.01%
MSCI All Country World Net Index	17.49%	10.06%	10.52%

Performance Inception Date

Apr. 30, 2019

AssetsNet

$ 3,861,216

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 0

InvestmentCompanyPortfolioTurnover

62.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$3,861,216
# of Portfolio Holdings	48
Portfolio Turnover Rate	62%
Total Advisory Fees Paid (Net of Waivers)	$0

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Communication Services	0.1%
Energy	1.2%
Short-Term Investments	2.3%
Materials	3.0%
Investment Companies	3.7%
Real Estate	4.3%
Consumer Staples	4.7%
Financals	4.7%
Health Care	14.4%
Consumer Discretionary	18.6%
Information Technology	19.3%
Industrials	23.7%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Cloudflare, Inc.	11.0%
Royalty Pharma PLC	5.1%
Eurofins Scientific SE	5.1%
ASML Holding NV	5.1%
Babcock International Group PLC	5.1%
Rentokil Initial PLC	5.0%
LVMH Moet Hennessy Louis Vuitton SE	5.0%
Canadian National Railway Co.	5.0%
Floor & Decor Holdings, Inc.	4.7%
Core & Main, Inc.	4.7%
Total	55.8%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000211168

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Permanence Portfolio

Class Name

Class I

Trading Symbol

MGKIX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Permanence Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$105	1.00%

Expenses Paid, Amount

$ 105

Expense Ratio, Percent

1.00%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World Net Index:

↓ Stock selection and an average overweight in consumer discretionary, where the largest detractor was a contemporary carpets and floor coverings company

↓ Stock selection and an average overweight in industrials, where a leading North American Class 1 freight railway was the largest detractor

↓ Stock selection and an average overweight in health care, driven by underperformance in an analytical testing and laboratory services provider

↑ Stock selection and an average underweight in energy, led by a holding in a Texas landowner

↑ Stock selection in real estate, helped by a land holding company focusing on managing land and resources to support and promote oil and natural gas production

↑ Stock selection and an average underweight in materials, driven by a precious metals streaming and royalty company

Line Graph [Table Text Block]

	Class I	MSCI All Country World Net Index
4/19	$1,000,000	$1,000,000
5/19	$979,000	$1,000,000
6/19	$1,035,000	$1,002,276
7/19	$1,032,000	$1,005,213
8/19	$1,041,000	$981,367
9/19	$1,034,000	$1,002,017
10/19	$1,040,000	$1,029,441
11/19	$1,062,000	$1,054,571
12/19	$1,063,000	$1,091,708
1/20	$1,074,000	$1,079,649
2/20	$998,000	$992,446
3/20	$875,000	$858,462
4/20	$996,000	$950,425
5/20	$1,074,000	$991,760
6/20	$1,111,000	$1,023,449
7/20	$1,163,000	$1,077,577
8/20	$1,210,000	$1,143,530
9/20	$1,189,000	$1,106,659
10/20	$1,162,000	$1,079,757
11/20	$1,282,000	$1,212,851
12/20	$1,350,640	$1,269,163
1/21	$1,295,244	$1,263,391
2/21	$1,366,755	$1,292,656
3/21	$1,392,942	$1,327,182
4/21	$1,474,524	$1,385,209
5/21	$1,484,596	$1,406,767
6/21	$1,524,883	$1,425,304
7/21	$1,570,207	$1,435,126
8/21	$1,599,415	$1,471,046
9/21	$1,517,833	$1,410,277
10/21	$1,625,602	$1,482,263
11/21	$1,590,351	$1,446,569
12/21	$1,617,056	$1,504,433
1/22	$1,472,087	$1,430,546
2/22	$1,429,657	$1,393,599
3/22	$1,473,266	$1,423,783
4/22	$1,321,225	$1,309,821
5/22	$1,288,223	$1,311,354
6/22	$1,222,221	$1,200,812
7/22	$1,345,975	$1,284,667
8/22	$1,254,044	$1,237,372
9/22	$1,159,755	$1,118,920
10/22	$1,254,044	$1,186,443
11/22	$1,374,262	$1,278,468
12/22	$1,295,628	$1,228,159
1/23	$1,421,592	$1,316,189
2/23	$1,401,198	$1,278,467
3/23	$1,474,377	$1,317,886
4/23	$1,464,779	$1,336,827
5/23	$1,494,771	$1,322,509
6/23	$1,547,556	$1,399,295
7/23	$1,609,938	$1,450,520
8/23	$1,536,759	$1,409,987
9/23	$1,431,189	$1,351,683
10/23	$1,343,614	$1,311,042
11/23	$1,463,580	$1,432,046
12/23	$1,566,727	$1,500,833
1/24	$1,551,566	$1,509,631
2/24	$1,708,238	$1,574,414
3/24	$1,761,305	$1,623,846
4/24	$1,607,159	$1,570,270
5/24	$1,666,543	$1,634,045
6/24	$1,636,219	$1,670,439
7/24	$1,704,448	$1,697,378
8/24	$1,701,921	$1,740,486
9/24	$1,696,867	$1,780,919
10/24	$1,656,435	$1,740,943
11/24	$1,765,095	$1,806,061
12/24	$1,734,222	$1,763,309

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 4/30/19 (Inception)
Class I	10.69%	10.28%	10.19%
MSCI All Country World Net Index	17.49%	10.06%	10.52%

Performance Inception Date

Apr. 30, 2019

AssetsNet

$ 3,861,216

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 0

InvestmentCompanyPortfolioTurnover

62.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$3,861,216
# of Portfolio Holdings	48
Portfolio Turnover Rate	62%
Total Advisory Fees Paid (Net of Waivers)	$0

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Communication Services	0.1%
Energy	1.2%
Short-Term Investments	2.3%
Materials	3.0%
Investment Companies	3.7%
Real Estate	4.3%
Consumer Staples	4.7%
Financals	4.7%
Health Care	14.4%
Consumer Discretionary	18.6%
Information Technology	19.3%
Industrials	23.7%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Cloudflare, Inc.	11.0%
Royalty Pharma PLC	5.1%
Eurofins Scientific SE	5.1%
ASML Holding NV	5.1%
Babcock International Group PLC	5.1%
Rentokil Initial PLC	5.0%
LVMH Moet Hennessy Louis Vuitton SE	5.0%
Canadian National Railway Co.	5.0%
Floor & Decor Holdings, Inc.	4.7%
Core & Main, Inc.	4.7%
Total	55.8%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000211165

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Permanence Portfolio

Class Name

Class R6

Trading Symbol

MGKQX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Permanence Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$100	0.95%

Expenses Paid, Amount

$ 100

Expense Ratio, Percent

0.95%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World Net Index:

↓ Stock selection and an average overweight in consumer discretionary, where the largest detractor was a contemporary carpets and floor coverings company

↓ Stock selection and an average overweight in industrials, where a leading North American Class 1 freight railway was the largest detractor

↓ Stock selection and an average overweight in health care, driven by underperformance in an analytical testing and laboratory services provider

↑ Stock selection and an average underweight in energy, led by a holding in a Texas landowner

↑ Stock selection in real estate, helped by a land holding company focusing on managing land and resources to support and promote oil and natural gas production

↑ Stock selection and an average underweight in materials, driven by a precious metals streaming and royalty company

Line Graph [Table Text Block]

	Class R6	MSCI All Country World Net Index
4/19	$5,000,000	$5,000,000
5/19	$4,895,000	$5,000,000
6/19	$5,175,000	$5,011,382
7/19	$5,160,000	$5,026,066
8/19	$5,205,000	$4,906,836
9/19	$5,170,000	$5,010,084
10/19	$5,200,000	$5,147,203
11/19	$5,315,000	$5,272,854
12/19	$5,320,000	$5,458,539
1/20	$5,370,000	$5,398,244
2/20	$4,995,000	$4,962,229
3/20	$4,375,000	$4,292,312
4/20	$4,985,000	$4,752,126
5/20	$5,375,000	$4,958,801
6/20	$5,555,000	$5,117,247
7/20	$5,820,000	$5,387,883
8/20	$6,050,000	$5,717,649
9/20	$5,950,000	$5,533,293
10/20	$5,815,000	$5,398,787
11/20	$6,415,000	$6,064,257
12/20	$6,761,060	$6,345,817
1/21	$6,483,967	$6,316,956
2/21	$6,836,631	$6,463,279
3/21	$6,972,658	$6,635,909
4/21	$7,380,740	$6,926,047
5/21	$7,431,120	$7,033,833
6/21	$7,632,642	$7,126,520
7/21	$7,859,354	$7,175,628
8/21	$8,005,458	$7,355,229
9/21	$7,597,376	$7,051,386
10/21	$8,141,485	$7,411,314
11/21	$7,960,115	$7,232,846
12/21	$8,093,663	$7,522,163
1/22	$7,368,594	$7,152,732
2/22	$7,156,378	$6,967,996
3/22	$7,380,383	$7,118,916
4/22	$6,619,945	$6,549,105
5/22	$6,454,888	$6,556,769
6/22	$6,118,880	$6,004,058
7/22	$6,743,737	$6,423,336
8/22	$6,278,042	$6,186,862
9/22	$5,812,347	$5,594,598
10/22	$6,283,937	$5,932,215
11/22	$6,879,319	$6,392,338
12/22	$6,491,924	$6,140,793
1/23	$7,121,917	$6,580,946
2/23	$7,019,918	$6,392,336
3/23	$7,385,914	$6,589,428
4/23	$7,337,914	$6,684,135
5/23	$7,493,913	$6,612,545
6/23	$7,751,910	$6,996,475
7/23	$8,063,906	$7,252,602
8/23	$7,697,910	$7,049,936
9/23	$7,175,916	$6,758,415
10/23	$6,731,922	$6,555,211
11/23	$7,331,915	$7,160,229
12/23	$7,852,135	$7,504,164
1/24	$7,776,268	$7,548,155
2/24	$8,560,217	$7,872,072
3/24	$8,825,749	$8,119,230
4/24	$8,054,444	$7,851,352
5/24	$8,351,586	$8,170,224
6/24	$8,199,854	$8,352,193
7/24	$8,547,573	$8,486,892
8/24	$8,534,929	$8,702,430
9/24	$8,509,640	$8,904,597
10/24	$8,307,331	$8,704,717
11/24	$8,851,037	$9,030,305
12/24	$8,702,278	$8,816,543

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 4/30/19 (Inception)
Class R6	10.83%	10.34%	10.26%
MSCI All Country World Net Index	17.49%	10.06%	10.52%

Performance Inception Date

Apr. 30, 2019

AssetsNet

$ 3,861,216

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 0

InvestmentCompanyPortfolioTurnover

62.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$3,861,216
# of Portfolio Holdings	48
Portfolio Turnover Rate	62%
Total Advisory Fees Paid (Net of Waivers)	$0

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Communication Services	0.1%
Energy	1.2%
Short-Term Investments	2.3%
Materials	3.0%
Investment Companies	3.7%
Real Estate	4.3%
Consumer Staples	4.7%
Financals	4.7%
Health Care	14.4%
Consumer Discretionary	18.6%
Information Technology	19.3%
Industrials	23.7%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Cloudflare, Inc.	11.0%
Royalty Pharma PLC	5.1%
Eurofins Scientific SE	5.1%
ASML Holding NV	5.1%
Babcock International Group PLC	5.1%
Rentokil Initial PLC	5.0%
LVMH Moet Hennessy Louis Vuitton SE	5.0%
Canadian National Railway Co.	5.0%
Floor & Decor Holdings, Inc.	4.7%
Core & Main, Inc.	4.7%
Total	55.8%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000129961

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Stars Portfolio

Class Name

Class A

Trading Symbol

MGQAX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Stars Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Material Fund Change Notice [Text Block]

This report describes changes to the Fund that occurred during the reporting period.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$126	1.17%

Expenses Paid, Amount

$ 126

Expense Ratio, Percent

1.17%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI World/MSCI AC World Blended Index:

↓ Stock selection, driven by weakness in health care, financials and information technology

↑ Sector allocation, aided by the zero weight in materials

Line Graph [Table Text Block]

	Class A with maximum sales charge	MSCI All Country World Net Index	MSCI World/MSCI AC World Blended Index	MSCI World Net Index
12/14	$9,473	$10,000	$10,000	$10,000
1/15	$9,423	$9,844	$9,819	$9,819
2/15	$9,849	$10,392	$10,394	$10,394
3/15	$9,573	$10,231	$10,231	$10,231
4/15	$9,900	$10,528	$10,471	$10,471
5/15	$9,958	$10,514	$10,507	$10,507
6/15	$9,707	$10,266	$10,263	$10,263
7/15	$10,287	$10,355	$10,447	$10,447
8/15	$9,507	$9,646	$9,756	$9,756
9/15	$9,440	$9,296	$9,396	$9,396
10/15	$10,254	$10,026	$10,141	$10,141
11/15	$10,094	$9,943	$10,090	$10,090
12/15	$9,938	$9,764	$9,913	$9,913
1/16	$9,842	$9,175	$9,320	$9,320
2/16	$9,624	$9,112	$9,250	$9,250
3/16	$10,147	$9,787	$9,878	$9,878
4/16	$10,182	$9,931	$10,035	$10,035
5/16	$10,312	$9,944	$10,091	$10,091
6/16	$10,382	$9,884	$9,978	$9,978
7/16	$10,601	$10,310	$10,399	$10,399
8/16	$10,513	$10,344	$10,408	$10,408
9/16	$10,504	$10,408	$10,463	$10,463
10/16	$10,247	$10,231	$10,261	$10,261
11/16	$10,061	$10,309	$10,408	$10,408
12/16	$10,318	$10,531	$10,657	$10,657
1/17	$10,615	$10,819	$10,915	$10,915
2/17	$11,074	$11,123	$11,217	$11,217
3/17	$11,284	$11,259	$11,337	$11,337
4/17	$11,533	$11,434	$11,505	$11,505
5/17	$12,011	$11,687	$11,748	$11,748
6/17	$11,886	$11,740	$11,793	$11,793
7/17	$12,031	$12,068	$12,076	$12,076
8/17	$11,916	$12,114	$12,093	$12,093
9/17	$11,945	$12,348	$12,364	$12,364
10/17	$12,146	$12,605	$12,598	$12,598
11/17	$12,415	$12,849	$12,871	$12,871
12/17	$12,634	$13,056	$13,045	$13,045
1/18	$13,234	$13,793	$13,733	$13,733
2/18	$12,614	$13,213	$13,164	$13,164
3/18	$12,634	$12,931	$12,878	$12,878
4/18	$12,614	$13,054	$13,026	$13,026
5/18	$12,898	$13,070	$13,107	$13,107
6/18	$13,305	$13,000	$13,101	$13,101
7/18	$13,527	$13,392	$13,510	$13,510
8/18	$13,803	$13,497	$13,677	$13,677
9/18	$13,988	$13,555	$13,753	$13,753
10/18	$12,984	$12,540	$12,744	$12,744
11/18	$13,516	$12,723	$12,888	$12,888
12/18	$12,667	$11,827	$11,908	$11,908
1/19	$13,171	$12,761	$12,835	$12,835
2/19	$13,741	$13,102	$13,221	$13,221
3/19	$14,234	$13,267	$13,394	$13,394
4/19	$14,738	$13,715	$13,869	$13,869
5/19	$14,256	$12,901	$13,069	$13,069
6/19	$15,111	$13,746	$13,930	$13,930
7/19	$15,199	$13,786	$13,999	$13,999
8/19	$15,308	$13,459	$13,713	$13,713
9/19	$15,275	$13,742	$14,005	$14,005
10/19	$15,494	$14,119	$14,361	$14,361
11/19	$15,977	$14,463	$14,761	$14,761
12/19	$16,408	$14,973	$15,203	$15,203
1/20	$16,655	$14,807	$15,111	$15,111
2/20	$15,376	$13,611	$13,834	$13,834
3/20	$14,119	$11,774	$12,003	$12,003
4/20	$15,600	$13,035	$13,314	$13,314
5/20	$16,240	$13,602	$13,957	$13,957
6/20	$16,610	$14,036	$14,326	$14,326
7/20	$17,553	$14,779	$15,012	$15,012
8/20	$18,305	$15,683	$16,015	$16,015
9/20	$17,800	$15,178	$15,462	$15,462
10/20	$16,947	$14,809	$14,988	$14,988
11/20	$18,316	$16,634	$16,904	$16,904
12/20	$18,957	$17,406	$17,621	$17,621
1/21	$18,532	$17,327	$17,446	$17,446
2/21	$18,624	$17,729	$17,893	$17,893
3/21	$19,394	$18,202	$18,488	$18,488
4/21	$20,335	$18,998	$19,349	$19,349
5/21	$20,335	$19,294	$19,627	$19,627
6/21	$20,576	$19,548	$19,920	$19,920
7/21	$21,173	$19,682	$20,277	$20,277
8/21	$21,472	$20,175	$20,781	$20,781
9/21	$20,542	$19,342	$19,919	$19,919
10/21	$21,644	$20,329	$21,047	$21,047
11/21	$20,978	$19,839	$20,586	$20,586
12/21	$22,408	$20,633	$21,465	$21,465
1/22	$21,067	$19,620	$20,330	$20,330
2/22	$20,309	$19,113	$19,816	$19,816
3/22	$20,390	$19,527	$20,359	$20,359
4/22	$18,990	$17,964	$18,668	$18,668
5/22	$18,979	$17,985	$18,682	$18,682
6/22	$17,742	$16,469	$17,064	$17,064
7/22	$19,014	$17,619	$18,419	$18,419
8/22	$17,859	$16,970	$17,649	$17,649
9/22	$16,144	$15,346	$16,008	$16,008
10/22	$16,949	$16,272	$17,158	$17,158
11/22	$18,454	$17,534	$18,351	$18,351
12/22	$17,722	$16,844	$17,571	$17,571
1/23	$18,834	$18,051	$18,815	$18,815
2/23	$18,015	$17,534	$18,362	$18,362
3/23	$19,022	$18,075	$18,930	$18,930
4/23	$19,443	$18,334	$19,261	$19,261
5/23	$19,209	$18,138	$19,069	$19,069
6/23	$20,262	$19,191	$20,222	$20,222
7/23	$20,602	$19,894	$20,902	$20,902
8/23	$20,450	$19,338	$20,403	$20,403
9/23	$19,361	$18,538	$19,522	$19,522
10/23	$18,834	$17,981	$18,956	$18,956
11/23	$20,684	$19,640	$20,733	$20,733
12/23	$21,479	$20,584	$21,751	$21,751
1/24	$21,900	$20,704	$22,012	$22,012
2/24	$22,768	$21,593	$22,945	$22,945
3/24	$22,779	$22,271	$23,683	$23,683
4/24	$21,725	$21,536	$22,803	$22,803
5/24	$22,393	$22,411	$23,821	$23,821
6/24	$22,826	$22,910	$24,314	$24,306
7/24	$23,447	$23,279	$24,706	$24,734
8/24	$24,092	$23,870	$25,333	$25,388
9/24	$24,678	$24,425	$25,922	$25,853
10/24	$24,221	$23,877	$25,340	$25,340
11/24	$25,592	$24,770	$26,288	$26,503
12/24	$24,896	$24,183	$25,665	$25,812

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class A	15.91%	8.70%	10.14%
Class A, with 5.25% maximum front end sales charge	9.80%	7.53%	9.55%
MSCI All Country World Net Index	17.49%	10.06%	9.23%
MSCI World/MSCI AC World Blended Index	18.00%	11.04%	9.88%
MSCI World Net Index	18.67%	11.17%	9.95%

Material Change Date

Dec. 31, 2023

AssetsNet

$ 58,794,206

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 183,142

InvestmentCompanyPortfolioTurnover

73.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$58,794,206
# of Portfolio Holdings	37
Portfolio Turnover Rate	73%
Total Advisory Fees Paid	$183,142

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.4%
Consumer Staples	1.6%
Consumer Discretionary	5.9%
Communication Services	10.2%
Health Care	15.7%
Industrials	17.5%
Information Technology	23.2%
Financials	24.5%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

SAP SE	7.9%
Alphabet, Inc.	5.6%
Visa, Inc.	4.7%
UnitedHealth Group, Inc.	3.5%
Mastercard, Inc.	3.4%
Galderma Group AG	3.3%
Microsoft Corp.	3.3%
Tradeweb Markets, Inc.	3.2%
Aon PLC	3.1%
Booking Holdings, Inc.	3.0%
Total	41.0%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Material Fund Changes

This is a summary of certain changes to the Fund since December 31, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by May 1, 2025 at www.morganstanley.com/im/shareholderreports or upon request by contacting us at 1-800-869-6397.

Effective June 27, 2024, the Global Stars Portfolio was changed from Global Sustain Portfolio.

Material Fund Change Name [Text Block]

Effective June 27, 2024, the Global Stars Portfolio was changed from Global Sustain Portfolio.

Summary of Change Legend [Text Block]

Updated Prospectus Web Address

C000155911

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Stars Portfolio

Class Name

Class C

Trading Symbol

MSGQX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Stars Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Material Fund Change Notice [Text Block]

This report describes changes to the Fund that occurred during the reporting period.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$206	1.92%

Expenses Paid, Amount

$ 206

Expense Ratio, Percent

1.92%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI World/MSCI AC World Blended Index:

↓ Stock selection, driven by weakness in health care, financials and information technology

↑ Sector allocation, aided by the zero weight in materials

Line Graph [Table Text Block]

	Class C	MSCI All Country World Net Index	MSCI World/MSCI AC World Blended Index	MSCI World Net Index
4/15	$10,000	$10,000	$10,000	$10,000
5/15	$10,059	$9,987	$10,034	$10,034
6/15	$9,796	$9,752	$9,801	$9,801
7/15	$10,377	$9,837	$9,977	$9,977
8/15	$9,576	$9,162	$9,317	$9,317
9/15	$9,508	$8,830	$8,973	$8,973
10/15	$10,309	$9,523	$9,684	$9,684
11/15	$10,155	$9,445	$9,636	$9,636
12/15	$9,987	$9,274	$9,467	$9,467
1/16	$9,890	$8,715	$8,900	$8,900
2/16	$9,660	$8,655	$8,834	$8,834
3/16	$10,173	$9,296	$9,434	$9,434
4/16	$10,199	$9,434	$9,583	$9,583
5/16	$10,332	$9,446	$9,637	$9,637
6/16	$10,394	$9,388	$9,529	$9,529
7/16	$10,598	$9,793	$9,931	$9,931
8/16	$10,508	$9,826	$9,940	$9,940
9/16	$10,490	$9,886	$9,992	$9,992
10/16	$10,230	$9,718	$9,799	$9,799
11/16	$10,041	$9,792	$9,940	$9,940
12/16	$10,293	$10,004	$10,178	$10,178
1/17	$10,582	$10,277	$10,423	$10,423
2/17	$11,026	$10,566	$10,713	$10,713
3/17	$11,229	$10,695	$10,827	$10,827
4/17	$11,470	$10,861	$10,987	$10,987
5/17	$11,933	$11,101	$11,219	$11,219
6/17	$11,808	$11,152	$11,263	$11,263
7/17	$11,944	$11,463	$11,532	$11,532
8/17	$11,827	$11,507	$11,548	$11,548
9/17	$11,847	$11,730	$11,807	$11,807
10/17	$12,031	$11,973	$12,031	$12,031
11/17	$12,292	$12,205	$12,291	$12,291
12/17	$12,502	$12,402	$12,458	$12,458
1/18	$13,093	$13,101	$13,115	$13,115
2/18	$12,461	$12,551	$12,572	$12,572
3/18	$12,481	$12,283	$12,298	$12,298
4/18	$12,451	$12,400	$12,439	$12,439
5/18	$12,726	$12,415	$12,517	$12,517
6/18	$13,114	$12,348	$12,511	$12,511
7/18	$13,326	$12,720	$12,902	$12,902
8/18	$13,594	$12,820	$13,062	$13,062
9/18	$13,769	$12,876	$13,134	$13,134
10/18	$12,771	$11,911	$12,170	$12,170
11/18	$13,285	$12,086	$12,308	$12,308
12/18	$12,440	$11,234	$11,372	$11,372
1/19	$12,935	$12,121	$12,257	$12,257
2/19	$13,474	$12,446	$12,626	$12,626
3/19	$13,959	$12,602	$12,792	$12,792
4/19	$14,443	$13,028	$13,245	$13,245
5/19	$13,959	$12,255	$12,481	$12,481
6/19	$14,795	$13,057	$13,303	$13,303
7/19	$14,872	$13,095	$13,369	$13,369
8/19	$14,960	$12,785	$13,096	$13,096
9/19	$14,927	$13,054	$13,374	$13,374
10/19	$15,126	$13,411	$13,715	$13,715
11/19	$15,588	$13,738	$14,097	$14,097
12/19	$16,001	$14,222	$14,519	$14,519
1/20	$16,237	$14,065	$14,431	$14,431
2/20	$14,977	$12,929	$13,211	$13,211
3/20	$13,739	$11,184	$11,463	$11,463
4/20	$15,168	$12,382	$12,715	$12,715
5/20	$15,787	$12,920	$13,329	$13,329
6/20	$16,136	$13,333	$13,682	$13,682
7/20	$17,036	$14,038	$14,336	$14,336
8/20	$17,756	$14,897	$15,294	$15,294
9/20	$17,261	$14,417	$14,766	$14,766
10/20	$16,417	$14,067	$14,313	$14,313
11/20	$17,745	$15,800	$16,143	$16,143
12/20	$18,350	$16,534	$16,828	$16,828
1/21	$17,924	$16,459	$16,661	$16,661
2/21	$18,004	$16,840	$17,088	$17,088
3/21	$18,730	$17,290	$17,656	$17,656
4/21	$19,639	$18,046	$18,478	$18,478
5/21	$19,628	$18,327	$18,744	$18,744
6/21	$19,846	$18,568	$19,023	$19,023
7/21	$20,399	$18,696	$19,364	$19,364
8/21	$20,675	$19,164	$19,846	$19,846
9/21	$19,766	$18,372	$19,022	$19,022
10/21	$20,813	$19,310	$20,099	$20,099
11/21	$20,169	$18,845	$19,659	$19,659
12/21	$21,530	$19,599	$20,499	$20,499
1/22	$20,221	$18,637	$19,415	$19,415
2/22	$19,485	$18,155	$18,924	$18,924
3/22	$19,555	$18,548	$19,443	$19,443
4/22	$18,199	$17,064	$17,828	$17,828
5/22	$18,176	$17,084	$17,841	$17,841
6/22	$16,983	$15,644	$16,296	$16,296
7/22	$18,187	$16,736	$17,590	$17,590
8/22	$17,065	$16,120	$16,854	$16,854
9/22	$15,417	$14,577	$15,287	$15,287
10/22	$16,177	$15,456	$16,385	$16,385
11/22	$17,603	$16,655	$17,525	$17,525
12/22	$16,893	$16,000	$16,780	$16,780
1/23	$17,949	$17,147	$17,968	$17,968
2/23	$17,151	$16,655	$17,536	$17,536
3/23	$18,102	$17,169	$18,078	$18,078
4/23	$18,500	$17,416	$18,395	$18,395
5/23	$18,278	$17,229	$18,211	$18,211
6/23	$19,280	$18,229	$19,312	$19,312
7/23	$19,603	$18,897	$19,961	$19,961
8/23	$19,458	$18,369	$19,484	$19,484
9/23	$18,422	$17,609	$18,644	$18,644
10/23	$17,921	$17,080	$18,103	$18,103
11/23	$19,681	$18,656	$19,800	$19,800
12/23	$20,437	$19,552	$20,772	$20,772
1/24	$20,839	$19,667	$21,021	$21,021
2/24	$21,664	$20,511	$21,912	$21,912
3/24	$21,675	$21,155	$22,617	$22,617
4/24	$20,671	$20,457	$21,777	$21,777
5/24	$21,307	$21,288	$22,749	$22,749
6/24	$21,719	$21,762	$23,219	$23,212
7/24	$22,310	$22,113	$23,594	$23,621
8/24	$22,924	$22,674	$24,193	$24,245
9/24	$23,481	$23,201	$24,755	$24,689
10/24	$23,046	$22,680	$24,199	$24,199
11/24	$24,351	$23,529	$25,105	$25,310
12/24	$23,689	$22,972	$24,510	$24,650

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 4/30/15 (Inception)
Class C, with conversion to Class A after 8 years	15.03%	7.89%	9.33%
Class C, with 1% maximum contingent deferred sales charge and conversion to Class A after 8 years	14.16%	7.89%	9.33%
MSCI All Country World Net Index	17.49%	10.06%	8.98%
MSCI World/MSCI AC World Blended Index	18.00%	11.04%	9.71%
MSCI World Net Index	18.67%	11.17%	9.78%

Performance Inception Date

Apr. 30, 2015

Material Change Date

Dec. 31, 2023

AssetsNet

$ 58,794,206

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 183,142

InvestmentCompanyPortfolioTurnover

73.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$58,794,206
# of Portfolio Holdings	37
Portfolio Turnover Rate	73%
Total Advisory Fees Paid	$183,142

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.4%
Consumer Staples	1.6%
Consumer Discretionary	5.9%
Communication Services	10.2%
Health Care	15.7%
Industrials	17.5%
Information Technology	23.2%
Financials	24.5%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

SAP SE	7.9%
Alphabet, Inc.	5.6%
Visa, Inc.	4.7%
UnitedHealth Group, Inc.	3.5%
Mastercard, Inc.	3.4%
Galderma Group AG	3.3%
Microsoft Corp.	3.3%
Tradeweb Markets, Inc.	3.2%
Aon PLC	3.1%
Booking Holdings, Inc.	3.0%
Total	41.0%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Material Fund Changes

Effective June 27, 2024, the Global Stars Portfolio was changed from Global Sustain Portfolio.

Material Fund Change Name [Text Block]

Effective June 27, 2024, the Global Stars Portfolio was changed from Global Sustain Portfolio.

Summary of Change Legend [Text Block]

Updated Prospectus Web Address

C000129960

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Stars Portfolio

Class Name

Class I

Trading Symbol

MGQIX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Stars Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Material Fund Change Notice [Text Block]

This report describes changes to the Fund that occurred during the reporting period.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$92	0.85%

Expenses Paid, Amount

$ 92

Expense Ratio, Percent

0.85%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI World/MSCI AC World Blended Index:

↓ Stock selection, driven by weakness in health care, financials and information technology

↑ Sector allocation, aided by the zero weight in materials

Line Graph [Table Text Block]

	Class I	MSCI All Country World Net Index	MSCI World/MSCI AC World Blended Index	MSCI World Net Index
12/14	$1,000,000	$1,000,000	$1,000,000	$1,000,000
1/15	$995,591	$984,369	$981,880	$981,880
2/15	$1,040,564	$1,039,171	$1,039,407	$1,039,407
3/15	$1,011,464	$1,023,066	$1,023,137	$1,023,137
4/15	$1,045,855	$1,052,753	$1,047,132	$1,047,132
5/15	$1,052,910	$1,051,379	$1,050,739	$1,050,739
6/15	$1,026,455	$1,026,626	$1,026,307	$1,026,307
7/15	$1,088,485	$1,035,542	$1,044,729	$1,044,729
8/15	$1,006,252	$964,555	$975,595	$975,595
9/15	$999,178	$929,611	$939,611	$939,611
10/15	$1,085,832	$1,002,568	$1,014,069	$1,014,069
11/15	$1,069,032	$994,291	$1,009,024	$1,009,024
12/15	$1,052,654	$976,361	$991,288	$991,288
1/16	$1,043,436	$917,476	$931,985	$931,985
2/16	$1,020,392	$911,160	$925,048	$925,048
3/16	$1,075,698	$978,686	$987,821	$987,821
4/16	$1,079,385	$993,133	$1,003,452	$1,003,452
5/16	$1,094,133	$994,388	$1,009,088	$1,009,088
6/16	$1,101,507	$988,364	$997,781	$997,781
7/16	$1,124,642	$1,030,959	$1,039,935	$1,039,935
8/16	$1,117,151	$1,034,426	$1,040,800	$1,040,800
9/16	$1,115,278	$1,040,765	$1,046,328	$1,046,328
10/16	$1,088,122	$1,023,101	$1,026,079	$1,026,079
11/16	$1,069,394	$1,030,876	$1,040,833	$1,040,833
12/16	$1,096,858	$1,053,145	$1,065,738	$1,065,738
1/17	$1,129,327	$1,081,941	$1,091,460	$1,091,460
2/17	$1,178,031	$1,112,291	$1,121,741	$1,121,741
3/17	$1,200,354	$1,125,898	$1,133,690	$1,133,690
4/17	$1,227,750	$1,143,445	$1,150,476	$1,150,476
5/17	$1,278,484	$1,168,695	$1,174,814	$1,174,814
6/17	$1,266,308	$1,174,010	$1,179,334	$1,179,334
7/17	$1,281,643	$1,206,819	$1,207,558	$1,207,558
8/17	$1,270,436	$1,211,443	$1,209,259	$1,209,259
9/17	$1,273,493	$1,234,848	$1,236,399	$1,236,399
10/17	$1,294,887	$1,260,490	$1,259,766	$1,259,766
11/17	$1,324,432	$1,284,891	$1,287,061	$1,287,061
12/17	$1,347,587	$1,305,605	$1,304,467	$1,304,467
1/18	$1,412,427	$1,379,263	$1,373,343	$1,373,343
2/18	$1,346,507	$1,321,336	$1,316,449	$1,316,449
3/18	$1,348,668	$1,293,051	$1,287,755	$1,287,755
4/18	$1,347,587	$1,305,399	$1,302,553	$1,302,553
5/18	$1,377,846	$1,307,029	$1,310,715	$1,310,715
6/18	$1,421,072	$1,299,951	$1,310,090	$1,310,090
7/18	$1,445,787	$1,339,153	$1,351,009	$1,351,009
8/18	$1,476,316	$1,349,674	$1,367,725	$1,367,725
9/18	$1,495,942	$1,355,548	$1,375,340	$1,375,340
10/18	$1,390,180	$1,253,965	$1,274,352	$1,274,352
11/18	$1,446,877	$1,272,304	$1,288,828	$1,288,828
12/18	$1,355,625	$1,182,690	$1,190,828	$1,190,828
1/19	$1,410,646	$1,276,075	$1,283,482	$1,283,482
2/19	$1,471,520	$1,310,206	$1,322,076	$1,322,076
3/19	$1,525,371	$1,326,684	$1,339,441	$1,339,441
4/19	$1,579,221	$1,371,480	$1,386,936	$1,386,936
5/19	$1,528,883	$1,290,125	$1,306,909	$1,306,909
6/19	$1,621,365	$1,374,602	$1,393,027	$1,393,027
7/19	$1,630,730	$1,378,630	$1,399,928	$1,399,928
8/19	$1,643,607	$1,345,925	$1,371,293	$1,371,293
9/19	$1,640,095	$1,374,246	$1,400,475	$1,400,475
10/19	$1,664,679	$1,411,857	$1,436,114	$1,436,114
11/19	$1,716,188	$1,446,323	$1,476,110	$1,476,110
12/19	$1,762,719	$1,497,255	$1,520,331	$1,520,331
1/20	$1,790,374	$1,480,717	$1,511,078	$1,511,078
2/20	$1,653,301	$1,361,120	$1,383,353	$1,383,353
3/20	$1,518,632	$1,177,364	$1,200,277	$1,200,277
4/20	$1,677,349	$1,303,489	$1,331,400	$1,331,400
5/20	$1,747,088	$1,360,179	$1,395,718	$1,395,718
6/20	$1,787,970	$1,403,640	$1,432,636	$1,432,636
7/20	$1,890,174	$1,477,875	$1,501,175	$1,501,175
8/20	$1,970,734	$1,568,328	$1,601,475	$1,601,475
9/20	$1,917,829	$1,517,760	$1,546,226	$1,546,226
10/20	$1,826,446	$1,480,866	$1,498,795	$1,498,795
11/20	$1,974,342	$1,663,401	$1,690,434	$1,690,434
12/20	$2,044,024	$1,740,632	$1,762,102	$1,762,102
1/21	$1,998,382	$1,732,716	$1,744,589	$1,744,589
2/21	$2,008,251	$1,772,852	$1,789,294	$1,789,294
3/21	$2,092,134	$1,820,203	$1,848,827	$1,848,827
4/21	$2,194,520	$1,899,787	$1,934,872	$1,934,872
5/21	$2,195,754	$1,929,352	$1,962,744	$1,962,744
6/21	$2,221,658	$1,954,776	$1,991,999	$1,991,999
7/21	$2,287,038	$1,968,246	$2,027,681	$2,027,681
8/21	$2,320,344	$2,017,510	$2,078,147	$2,078,147
9/21	$2,220,425	$1,934,167	$1,991,861	$1,991,861
10/21	$2,340,081	$2,032,894	$2,104,681	$2,104,681
11/21	$2,268,534	$1,983,940	$2,058,561	$2,058,561
12/21	$2,424,655	$2,063,299	$2,146,544	$2,146,544
1/22	$2,278,924	$1,961,966	$2,032,969	$2,032,969
2/22	$2,198,521	$1,911,293	$1,981,553	$1,981,553
3/22	$2,207,315	$1,952,690	$2,035,933	$2,035,933
4/22	$2,056,560	$1,796,393	$1,866,801	$1,866,801
5/22	$2,056,560	$1,798,496	$1,868,215	$1,868,215
6/22	$1,923,392	$1,646,889	$1,706,387	$1,706,387
7/22	$2,060,328	$1,761,895	$1,841,868	$1,841,868
8/22	$1,935,955	$1,697,031	$1,764,863	$1,764,863
9/22	$1,751,279	$1,534,576	$1,600,802	$1,600,802
10/22	$1,839,220	$1,627,183	$1,715,760	$1,715,760
11/22	$2,002,539	$1,753,393	$1,835,057	$1,835,057
12/22	$1,923,111	$1,684,395	$1,757,127	$1,757,127
1/23	$2,045,836	$1,805,127	$1,881,455	$1,881,455
2/23	$1,956,006	$1,753,392	$1,836,228	$1,836,228
3/23	$2,066,079	$1,807,454	$1,892,966	$1,892,966
4/23	$2,112,892	$1,833,431	$1,926,149	$1,926,149
5/23	$2,087,587	$1,813,795	$1,906,920	$1,906,920
6/23	$2,202,721	$1,919,105	$2,022,246	$2,022,246
7/23	$2,241,942	$1,989,360	$2,090,179	$2,090,179
8/23	$2,225,495	$1,933,769	$2,040,254	$2,040,254
9/23	$2,107,831	$1,853,806	$1,952,240	$1,952,240
10/23	$2,050,897	$1,798,068	$1,895,595	$1,895,595
11/23	$2,253,329	$1,964,022	$2,073,311	$2,073,311
12/23	$2,340,287	$2,058,362	$2,175,098	$2,175,098
1/24	$2,386,050	$2,070,429	$2,201,200	$2,201,200
2/24	$2,481,390	$2,159,278	$2,294,526	$2,294,526
3/24	$2,483,933	$2,227,072	$2,368,260	$2,368,260
4/24	$2,369,524	$2,153,595	$2,280,292	$2,280,292
5/24	$2,441,983	$2,241,060	$2,382,112	$2,382,112
6/24	$2,490,289	$2,290,973	$2,431,373	$2,430,583
7/24	$2,558,934	$2,327,921	$2,470,585	$2,473,415
8/24	$2,630,121	$2,387,042	$2,533,329	$2,538,789
9/24	$2,696,224	$2,442,495	$2,592,181	$2,585,284
10/24	$2,646,647	$2,387,669	$2,533,995	$2,534,000
11/24	$2,795,378	$2,476,977	$2,628,776	$2,650,277
12/24	$2,721,165	$2,418,343	$2,566,548	$2,581,209

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class I	16.27%	9.07%	10.53%
MSCI All Country World Net Index	17.49%	10.06%	9.23%
MSCI World/MSCI AC World Blended Index	18.00%	11.04%	9.88%
MSCI World Net Index	18.67%	11.17%	9.95%

Material Change Date

Dec. 31, 2023

AssetsNet

$ 58,794,206

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 183,142

InvestmentCompanyPortfolioTurnover

73.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$58,794,206
# of Portfolio Holdings	37
Portfolio Turnover Rate	73%
Total Advisory Fees Paid	$183,142

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.4%
Consumer Staples	1.6%
Consumer Discretionary	5.9%
Communication Services	10.2%
Health Care	15.7%
Industrials	17.5%
Information Technology	23.2%
Financials	24.5%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

SAP SE	7.9%
Alphabet, Inc.	5.6%
Visa, Inc.	4.7%
UnitedHealth Group, Inc.	3.5%
Mastercard, Inc.	3.4%
Galderma Group AG	3.3%
Microsoft Corp.	3.3%
Tradeweb Markets, Inc.	3.2%
Aon PLC	3.1%
Booking Holdings, Inc.	3.0%
Total	41.0%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Material Fund Changes

Effective June 27, 2024, the Global Stars Portfolio was changed from Global Sustain Portfolio.

Material Fund Change Name [Text Block]

Effective June 27, 2024, the Global Stars Portfolio was changed from Global Sustain Portfolio.

Summary of Change Legend [Text Block]

Updated Prospectus Web Address

C000129962

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Stars Portfolio

Class Name

Class L

Trading Symbol

MGQLX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Stars Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Material Fund Change Notice [Text Block]

This report describes changes to the Fund that occurred during the reporting period.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$183	1.70%

Expenses Paid, Amount

$ 183

Expense Ratio, Percent

1.70%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI World/MSCI AC World Blended Index:

↓ Stock selection, driven by weakness in health care, financials and information technology

↑ Sector allocation, aided by the zero weight in materials

Line Graph [Table Text Block]

	Class L	MSCI All Country World Net Index	MSCI World/MSCI AC World Blended Index	MSCI World Net Index
12/14	$10,000	$10,000	$10,000	$10,000
1/15	$9,947	$9,844	$9,819	$9,819
2/15	$10,390	$10,392	$10,394	$10,394
3/15	$10,098	$10,231	$10,231	$10,231
4/15	$10,434	$10,528	$10,471	$10,471
5/15	$10,496	$10,514	$10,507	$10,507
6/15	$10,230	$10,266	$10,263	$10,263
7/15	$10,836	$10,355	$10,447	$10,447
8/15	$10,010	$9,646	$9,756	$9,756
9/15	$9,938	$9,296	$9,396	$9,396
10/15	$10,774	$10,026	$10,141	$10,141
11/15	$10,614	$9,943	$10,090	$10,090
12/15	$10,449	$9,764	$9,913	$9,913
1/16	$10,339	$9,175	$9,320	$9,320
2/16	$10,109	$9,112	$9,250	$9,250
3/16	$10,651	$9,787	$9,878	$9,878
4/16	$10,679	$9,931	$10,035	$10,035
5/16	$10,816	$9,944	$10,091	$10,091
6/16	$10,881	$9,884	$9,978	$9,978
7/16	$11,102	$10,310	$10,399	$10,399
8/16	$11,018	$10,344	$10,408	$10,408
9/16	$10,990	$10,408	$10,463	$10,463
10/16	$10,719	$10,231	$10,261	$10,261
11/16	$10,523	$10,309	$10,408	$10,408
12/16	$10,794	$10,531	$10,657	$10,657
1/17	$11,095	$10,819	$10,915	$10,915
2/17	$11,567	$11,123	$11,217	$11,217
3/17	$11,778	$11,259	$11,337	$11,337
4/17	$12,038	$11,434	$11,505	$11,505
5/17	$12,530	$11,687	$11,748	$11,748
6/17	$12,400	$11,740	$11,793	$11,793
7/17	$12,541	$12,068	$12,076	$12,076
8/17	$12,420	$12,114	$12,093	$12,093
9/17	$12,450	$12,348	$12,364	$12,364
10/17	$12,642	$12,605	$12,598	$12,598
11/17	$12,924	$12,849	$12,871	$12,871
12/17	$13,147	$13,056	$13,045	$13,045
1/18	$13,762	$13,793	$13,733	$13,733
2/18	$13,105	$13,213	$13,164	$13,164
3/18	$13,126	$12,931	$12,878	$12,878
4/18	$13,105	$13,054	$13,026	$13,026
5/18	$13,391	$13,070	$13,107	$13,107
6/18	$13,804	$13,000	$13,101	$13,101
7/18	$14,036	$13,392	$13,510	$13,510
8/18	$14,314	$13,497	$13,677	$13,677
9/18	$14,495	$13,555	$13,753	$13,753
10/18	$13,458	$12,540	$12,744	$12,744
11/18	$14,004	$12,723	$12,888	$12,888
12/18	$13,114	$11,827	$11,908	$11,908
1/19	$13,628	$12,761	$12,835	$12,835
2/19	$14,211	$13,102	$13,221	$13,221
3/19	$14,714	$13,267	$13,394	$13,394
4/19	$15,228	$13,715	$13,869	$13,869
5/19	$14,725	$12,901	$13,069	$13,069
6/19	$15,605	$13,746	$13,930	$13,930
7/19	$15,685	$13,786	$13,999	$13,999
8/19	$15,799	$13,459	$13,713	$13,713
9/19	$15,753	$13,742	$14,005	$14,005
10/19	$15,982	$14,119	$14,361	$14,361
11/19	$16,462	$14,463	$14,761	$14,761
12/19	$16,901	$14,973	$15,203	$15,203
1/20	$17,146	$14,807	$15,111	$15,111
2/20	$15,827	$13,611	$13,834	$13,834
3/20	$14,520	$11,774	$12,003	$12,003
4/20	$16,037	$13,035	$13,314	$13,314
5/20	$16,691	$13,602	$13,957	$13,957
6/20	$17,076	$14,036	$14,326	$14,326
7/20	$18,033	$14,779	$15,012	$15,012
8/20	$18,780	$15,683	$16,015	$16,015
9/20	$18,267	$15,178	$15,462	$15,462
10/20	$17,380	$14,809	$14,988	$14,988
11/20	$18,780	$16,634	$16,904	$16,904
12/20	$19,431	$17,406	$17,621	$17,621
1/21	$18,978	$17,327	$17,446	$17,446
2/21	$19,061	$17,729	$17,893	$17,893
3/21	$19,849	$18,202	$18,488	$18,488
4/21	$20,804	$18,998	$19,349	$19,349
5/21	$20,792	$19,294	$19,627	$19,627
6/21	$21,031	$19,548	$19,920	$19,920
7/21	$21,628	$19,682	$20,277	$20,277
8/21	$21,926	$20,175	$20,781	$20,781
9/21	$20,959	$19,342	$19,919	$19,919
10/21	$22,081	$20,329	$21,047	$21,047
11/21	$21,401	$19,839	$20,586	$20,586
12/21	$22,848	$20,633	$21,465	$21,465
1/22	$21,467	$19,620	$20,330	$20,330
2/22	$20,692	$19,113	$19,816	$19,816
3/22	$20,765	$19,527	$20,359	$20,359
4/22	$19,335	$17,964	$18,668	$18,668
5/22	$19,311	$17,985	$18,682	$18,682
6/22	$18,051	$16,469	$17,064	$17,064
7/22	$19,323	$17,619	$18,419	$18,419
8/22	$18,136	$16,970	$17,649	$17,649
9/22	$16,391	$15,346	$16,008	$16,008
10/22	$17,203	$16,272	$17,158	$17,158
11/22	$18,717	$17,534	$18,351	$18,351
12/22	$17,970	$16,844	$17,571	$17,571
1/23	$19,100	$18,051	$18,815	$18,815
2/23	$18,261	$17,534	$18,362	$18,362
3/23	$19,271	$18,075	$18,930	$18,930
4/23	$19,684	$18,334	$19,261	$19,261
5/23	$19,441	$18,138	$19,069	$19,069
6/23	$20,498	$19,191	$20,222	$20,222
7/23	$20,839	$19,894	$20,902	$20,902
8/23	$20,681	$19,338	$20,403	$20,403
9/23	$19,562	$18,538	$19,522	$19,522
10/23	$19,027	$17,981	$18,956	$18,956
11/23	$20,888	$19,640	$20,733	$20,733
12/23	$21,678	$20,584	$21,751	$21,751
1/24	$22,091	$20,704	$22,012	$22,012
2/24	$22,967	$21,593	$22,945	$22,945
3/24	$22,967	$22,271	$23,683	$23,683
4/24	$21,897	$21,536	$22,803	$22,803
5/24	$22,553	$22,411	$23,821	$23,821
6/24	$22,979	$22,910	$24,314	$24,306
7/24	$23,599	$23,279	$24,706	$24,734
8/24	$24,231	$23,870	$25,333	$25,388
9/24	$24,815	$24,425	$25,922	$25,853
10/24	$24,340	$23,877	$25,340	$25,340
11/24	$25,702	$24,770	$26,288	$26,503
12/24	$24,993	$24,183	$25,665	$25,812

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class L	15.29%	8.14%	9.59%
MSCI All Country World Net Index	17.49%	10.06%	9.23%
MSCI World/MSCI AC World Blended Index	18.00%	11.04%	9.88%
MSCI World Net Index	18.67%	11.17%	9.95%

Material Change Date

Dec. 31, 2023

AssetsNet

$ 58,794,206

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 183,142

InvestmentCompanyPortfolioTurnover

73.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$58,794,206
# of Portfolio Holdings	37
Portfolio Turnover Rate	73%
Total Advisory Fees Paid	$183,142

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.4%
Consumer Staples	1.6%
Consumer Discretionary	5.9%
Communication Services	10.2%
Health Care	15.7%
Industrials	17.5%
Information Technology	23.2%
Financials	24.5%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

SAP SE	7.9%
Alphabet, Inc.	5.6%
Visa, Inc.	4.7%
UnitedHealth Group, Inc.	3.5%
Mastercard, Inc.	3.4%
Galderma Group AG	3.3%
Microsoft Corp.	3.3%
Tradeweb Markets, Inc.	3.2%
Aon PLC	3.1%
Booking Holdings, Inc.	3.0%
Total	41.0%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Material Fund Changes

Effective June 27, 2024, the Global Stars Portfolio was changed from Global Sustain Portfolio.

Material Fund Change Name [Text Block]

Effective June 27, 2024, the Global Stars Portfolio was changed from Global Sustain Portfolio.

Summary of Change Legend [Text Block]

Updated Prospectus Web Address

C000129963

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Stars Portfolio

Class Name

Class R6

Trading Symbol

MGQSX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Stars Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Material Fund Change Notice [Text Block]

This report describes changes to the Fund that occurred during the reporting period.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$92	0.85%

Expenses Paid, Amount

$ 92

Expense Ratio, Percent

0.85%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI World/MSCI AC World Blended Index:

↓ Stock selection, driven by weakness in health care, financials and information technology

↑ Sector allocation, aided by the zero weight in materials

Line Graph [Table Text Block]

	Class R6	MSCI All Country World Net Index	MSCI World/MSCI AC World Blended Index	MSCI World Net Index
12/14	$5,000,000	$5,000,000	$5,000,000	$5,000,000
1/15	$4,977,954	$4,921,847	$4,909,402	$4,909,402
2/15	$5,202,822	$5,195,853	$5,197,036	$5,197,036
3/15	$5,061,728	$5,115,328	$5,115,685	$5,115,685
4/15	$5,233,686	$5,263,763	$5,235,661	$5,235,661
5/15	$5,264,550	$5,256,895	$5,253,696	$5,253,696
6/15	$5,136,684	$5,133,131	$5,131,536	$5,131,536
7/15	$5,446,833	$5,177,711	$5,223,647	$5,223,647
8/15	$5,031,246	$4,822,776	$4,877,974	$4,877,974
9/15	$5,000,298	$4,648,053	$4,698,053	$4,698,053
10/15	$5,433,569	$5,012,840	$5,070,346	$5,070,346
11/15	$5,349,568	$4,971,454	$5,045,118	$5,045,118
12/15	$5,268,903	$4,881,804	$4,956,438	$4,956,438
1/16	$5,218,196	$4,587,379	$4,659,923	$4,659,923
2/16	$5,102,953	$4,555,802	$4,625,241	$4,625,241
3/16	$5,384,146	$4,893,431	$4,939,106	$4,939,106
4/16	$5,402,585	$4,965,664	$5,017,260	$5,017,260
5/16	$5,471,730	$4,971,938	$5,045,440	$5,045,440
6/16	$5,513,218	$4,941,819	$4,988,904	$4,988,904
7/16	$5,628,991	$5,154,794	$5,199,677	$5,199,677
8/16	$5,586,844	$5,172,129	$5,203,998	$5,203,998
9/16	$5,577,478	$5,203,827	$5,231,641	$5,231,641
10/16	$5,446,353	$5,115,504	$5,130,394	$5,130,394
11/16	$5,348,010	$5,154,379	$5,204,164	$5,204,164
12/16	$5,488,754	$5,265,723	$5,328,691	$5,328,691
1/17	$5,651,234	$5,409,704	$5,457,300	$5,457,300
2/17	$5,889,875	$5,561,453	$5,608,704	$5,608,704
3/17	$6,006,657	$5,629,489	$5,668,448	$5,668,448
4/17	$6,143,749	$5,717,223	$5,752,380	$5,752,380
5/17	$6,397,623	$5,843,476	$5,874,069	$5,874,069
6/17	$6,336,693	$5,870,048	$5,896,669	$5,896,669
7/17	$6,413,432	$6,034,097	$6,037,790	$6,037,790
8/17	$6,357,353	$6,057,214	$6,046,293	$6,046,293
9/17	$6,372,647	$6,174,240	$6,181,997	$6,181,997
10/17	$6,479,707	$6,302,450	$6,298,828	$6,298,828
11/17	$6,627,553	$6,424,454	$6,435,307	$6,435,307
12/17	$6,746,492	$6,528,027	$6,522,335	$6,522,335
1/18	$7,071,103	$6,896,316	$6,866,716	$6,866,716
2/18	$6,735,672	$6,606,682	$6,582,245	$6,582,245
3/18	$6,751,902	$6,465,255	$6,438,776	$6,438,776
4/18	$6,746,492	$6,526,996	$6,512,765	$6,512,765
5/18	$6,897,977	$6,535,145	$6,553,577	$6,553,577
6/18	$7,114,384	$6,499,754	$6,550,451	$6,550,451
7/18	$7,238,113	$6,695,765	$6,755,044	$6,755,044
8/18	$7,390,954	$6,748,370	$6,838,623	$6,838,623
9/18	$7,489,209	$6,777,740	$6,876,701	$6,876,701
10/18	$6,959,724	$6,269,824	$6,371,759	$6,371,759
11/18	$7,243,572	$6,361,522	$6,444,142	$6,444,142
12/18	$6,790,884	$5,913,452	$5,954,142	$5,954,142
1/19	$7,060,642	$6,380,376	$6,417,409	$6,417,409
2/19	$7,371,451	$6,551,032	$6,610,379	$6,610,379
3/19	$7,635,346	$6,633,418	$6,697,203	$6,697,203
4/19	$7,910,969	$6,857,399	$6,934,681	$6,934,681
5/19	$7,658,803	$6,450,625	$6,534,544	$6,534,544
6/19	$8,122,084	$6,873,009	$6,965,137	$6,965,137
7/19	$8,168,999	$6,893,149	$6,999,638	$6,999,638
8/19	$8,227,642	$6,729,627	$6,856,463	$6,856,463
9/19	$8,215,913	$6,871,230	$7,002,376	$7,002,376
10/19	$8,339,064	$7,059,286	$7,180,569	$7,180,569
11/19	$8,597,094	$7,231,614	$7,380,549	$7,380,549
12/19	$8,833,313	$7,486,277	$7,601,657	$7,601,657
1/20	$8,971,898	$7,403,584	$7,555,388	$7,555,388
2/20	$8,284,996	$6,805,598	$6,916,767	$6,916,767
3/20	$7,604,120	$5,886,820	$6,001,384	$6,001,384
4/20	$8,405,506	$6,517,446	$6,657,001	$6,657,001
5/20	$8,754,982	$6,800,896	$6,978,588	$6,978,588
6/20	$8,959,847	$7,018,202	$7,163,180	$7,163,180
7/20	$9,472,011	$7,389,374	$7,505,876	$7,505,876
8/20	$9,875,716	$7,841,641	$8,007,377	$8,007,377
9/20	$9,610,596	$7,588,801	$7,731,130	$7,731,130
10/20	$9,152,662	$7,404,328	$7,493,977	$7,493,977
11/20	$9,899,818	$8,317,007	$8,452,168	$8,452,168
12/20	$10,246,563	$8,703,162	$8,810,512	$8,810,512
1/21	$10,017,762	$8,663,580	$8,722,947	$8,722,947
2/21	$10,067,232	$8,864,258	$8,946,468	$8,946,468
3/21	$10,487,731	$9,101,017	$9,244,135	$9,244,135
4/21	$11,000,987	$9,498,936	$9,674,358	$9,674,358
5/21	$11,007,170	$9,646,762	$9,813,721	$9,813,721
6/21	$11,143,214	$9,773,880	$9,959,993	$9,959,993
7/21	$11,464,772	$9,841,230	$10,138,404	$10,138,404
8/21	$11,631,735	$10,087,549	$10,390,733	$10,390,733
9/21	$11,130,846	$9,670,835	$9,959,305	$9,959,305
10/21	$11,730,675	$10,164,468	$10,523,405	$10,523,405
11/21	$11,372,015	$9,919,702	$10,292,805	$10,292,805
12/21	$12,152,825	$10,316,495	$10,732,722	$10,732,722
1/22	$11,428,317	$9,809,828	$10,164,844	$10,164,844
2/22	$11,025,113	$9,556,467	$9,907,763	$9,907,763
3/22	$11,069,214	$9,763,451	$10,179,665	$10,179,665
4/22	$10,313,206	$8,981,967	$9,334,007	$9,334,007
5/22	$10,313,206	$8,992,478	$9,341,077	$9,341,077
6/22	$9,645,399	$8,234,445	$8,531,934	$8,531,934
7/22	$10,332,106	$8,809,476	$9,209,338	$9,209,338
8/22	$9,708,400	$8,485,156	$8,824,316	$8,824,316
9/22	$8,782,290	$7,672,878	$8,004,008	$8,004,008
10/22	$9,223,295	$8,135,914	$8,578,799	$8,578,799
11/22	$10,042,303	$8,766,963	$9,175,287	$9,175,287
12/22	$9,649,544	$8,421,974	$8,785,637	$8,785,637
1/23	$10,258,988	$9,025,635	$9,407,274	$9,407,274
2/23	$9,814,602	$8,766,960	$9,181,138	$9,181,138
3/23	$10,366,911	$9,037,268	$9,464,832	$9,464,832
4/23	$10,601,801	$9,167,157	$9,630,747	$9,630,747
5/23	$10,474,833	$9,068,973	$9,534,599	$9,534,599
6/23	$11,052,536	$9,595,525	$10,111,231	$10,111,231
7/23	$11,249,336	$9,946,798	$10,450,895	$10,450,895
8/23	$11,166,807	$9,668,846	$10,201,268	$10,201,268
9/23	$10,576,408	$9,269,031	$9,761,202	$9,761,202
10/23	$10,290,730	$8,990,340	$9,477,973	$9,477,973
11/23	$11,306,472	$9,820,111	$10,366,553	$10,366,553
12/23	$11,748,014	$10,291,810	$10,875,490	$10,875,490
1/24	$11,977,741	$10,352,144	$11,006,002	$11,006,002
2/24	$12,456,340	$10,796,389	$11,472,631	$11,472,631
3/24	$12,462,722	$11,135,362	$11,841,301	$11,841,301
4/24	$11,894,784	$10,767,973	$11,401,460	$11,401,460
5/24	$12,258,519	$11,205,299	$11,910,558	$11,910,558
6/24	$12,507,391	$11,454,864	$12,156,865	$12,152,913
7/24	$12,858,364	$11,639,603	$12,352,924	$12,367,076
8/24	$13,209,336	$11,935,208	$12,666,645	$12,693,944
9/24	$13,541,165	$12,212,476	$12,960,905	$12,926,420
10/24	$13,292,294	$11,938,345	$12,669,975	$12,670,000
11/24	$14,045,290	$12,384,883	$13,143,879	$13,251,383
12/24	$13,669,023	$12,091,713	$12,832,742	$12,906,044

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class R6	16.35%	9.12%	10.58%
MSCI All Country World Net Index	17.49%	10.06%	9.23%
MSCI World/MSCI AC World Blended Index	18.00%	11.04%	9.88%
MSCI World Net Index	18.67%	11.17%	9.95%

Material Change Date

Dec. 31, 2023

AssetsNet

$ 58,794,206

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 183,142

InvestmentCompanyPortfolioTurnover

73.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$58,794,206
# of Portfolio Holdings	37
Portfolio Turnover Rate	73%
Total Advisory Fees Paid	$183,142

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.4%
Consumer Staples	1.6%
Consumer Discretionary	5.9%
Communication Services	10.2%
Health Care	15.7%
Industrials	17.5%
Information Technology	23.2%
Financials	24.5%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

SAP SE	7.9%
Alphabet, Inc.	5.6%
Visa, Inc.	4.7%
UnitedHealth Group, Inc.	3.5%
Mastercard, Inc.	3.4%
Galderma Group AG	3.3%
Microsoft Corp.	3.3%
Tradeweb Markets, Inc.	3.2%
Aon PLC	3.1%
Booking Holdings, Inc.	3.0%
Total	41.0%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Material Fund Changes

Effective June 27, 2024, the Global Stars Portfolio was changed from Global Sustain Portfolio.

Material Fund Change Name [Text Block]

Effective June 27, 2024, the Global Stars Portfolio was changed from Global Sustain Portfolio.

Summary of Change Legend [Text Block]

Updated Prospectus Web Address

C000007751

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Growth Portfolio

Class Name

Class A

Trading Symbol

MSEGX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Growth Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$106	0.86%

Expenses Paid, Amount

$ 106

Expense Ratio, Percent

0.86%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the Russell 1000^® Growth Index:

↑ Stock selection and average overweight in consumer discretionary, led by a position in a leading seller of used cars online in the United States

↑ Stock selection in information technology, led by a position in an enterprise analytics platform and Bitcoin developing company

↑ Stock selection and an average underweight in industrials, led by a global mobility and food delivery platform

↓ Stock selection in health care, where a position in an underperforming health care services provider was the largest detractor

↓ Average underweight to information technology

↓ Average underweight and stock selection in communication services, which lagged primarily because of underweight exposures to some of the “Magnificent 7” companies that drove significant performance gains within the Index in 2024

Line Graph [Table Text Block]

	Class A with maximum sales charge	Russell 1000^® Index	Russell 1000^® Growth Index
12/14	$9,476	$10,000	$10,000
1/15	$9,528	$9,725	$9,847
2/15	$10,255	$10,287	$10,503
3/15	$10,057	$10,159	$10,384
4/15	$10,242	$10,231	$10,436
5/15	$10,265	$10,365	$10,583
6/15	$10,277	$10,171	$10,396
7/15	$10,857	$10,367	$10,749
8/15	$10,112	$9,743	$10,096
9/15	$9,669	$9,476	$9,846
10/15	$10,253	$10,243	$10,694
11/15	$10,611	$10,277	$10,724
12/15	$10,568	$10,092	$10,567
1/16	$9,552	$9,549	$9,977
2/16	$9,275	$9,545	$9,973
3/16	$9,971	$10,210	$10,645
4/16	$9,947	$10,266	$10,548
5/16	$10,216	$10,446	$10,753
6/16	$10,130	$10,469	$10,711
7/16	$10,821	$10,868	$11,216
8/16	$10,910	$10,882	$11,160
9/16	$11,227	$10,891	$11,201
10/16	$10,827	$10,679	$10,938
11/16	$10,544	$11,100	$11,176
12/16	$10,335	$11,308	$11,314
1/17	$11,382	$11,536	$11,696
2/17	$11,607	$11,982	$12,182
3/17	$12,002	$11,990	$12,322
4/17	$12,529	$12,116	$12,604
5/17	$13,317	$12,271	$12,932
6/17	$13,180	$12,357	$12,898
7/17	$13,599	$12,601	$13,241
8/17	$13,985	$12,641	$13,483
9/17	$13,814	$12,910	$13,659
10/17	$14,565	$13,206	$14,188
11/17	$14,861	$13,609	$14,619
12/17	$14,826	$13,761	$14,733
1/18	$16,250	$14,516	$15,776
2/18	$16,470	$13,983	$15,363
3/18	$16,257	$13,666	$14,941
4/18	$16,287	$13,712	$14,994
5/18	$17,383	$14,062	$15,651
6/18	$17,689	$14,153	$15,801
7/18	$17,638	$14,642	$16,265
8/18	$19,202	$15,146	$17,155
9/18	$19,041	$15,204	$17,251
10/18	$17,054	$14,128	$15,708
11/18	$17,257	$14,415	$15,875
12/18	$15,921	$13,102	$14,510
1/19	$17,850	$14,200	$15,814
2/19	$18,751	$14,681	$16,380
3/19	$19,008	$14,937	$16,846
4/19	$19,755	$15,540	$17,607
5/19	$19,056	$14,550	$16,495
6/19	$20,370	$15,571	$17,628
7/19	$20,511	$15,813	$18,026
8/19	$19,538	$15,523	$17,888
9/19	$18,160	$15,792	$17,890
10/19	$18,176	$16,127	$18,394
11/19	$19,739	$16,736	$19,210
12/19	$19,553	$17,220	$19,790
1/20	$20,774	$17,238	$20,232
2/20	$20,702	$15,830	$18,854
3/20	$18,795	$13,738	$17,000
4/20	$22,650	$15,553	$19,515
5/20	$26,850	$16,374	$20,825
6/20	$29,736	$16,736	$21,732
7/20	$32,832	$17,716	$23,404
8/20	$35,633	$19,016	$25,819
9/20	$36,122	$18,321	$24,604
10/20	$34,695	$17,879	$23,769
11/20	$41,328	$19,985	$26,203
12/20	$42,057	$20,830	$27,408
1/21	$42,659	$20,658	$27,205
2/21	$44,966	$21,257	$27,199
3/21	$41,283	$22,061	$27,666
4/21	$43,502	$23,249	$29,548
5/21	$42,328	$23,359	$29,140
6/21	$47,465	$23,944	$30,968
7/21	$47,431	$24,442	$31,988
8/21	$48,471	$25,149	$33,184
9/21	$45,390	$23,994	$31,326
10/21	$48,870	$25,659	$34,039
11/21	$47,244	$25,315	$34,247
12/21	$42,125	$26,340	$34,971
1/22	$32,773	$24,855	$31,970
2/22	$32,444	$24,173	$30,612
3/22	$30,849	$24,989	$31,809
4/22	$24,004	$22,761	$27,968
5/22	$19,970	$22,727	$27,318
6/22	$18,127	$20,823	$25,154
7/22	$20,572	$22,763	$28,173
8/22	$20,839	$21,889	$26,861
9/22	$18,723	$19,863	$24,249
10/22	$19,195	$21,456	$25,667
11/22	$18,673	$22,617	$26,836
12/22	$16,665	$21,302	$24,782
1/23	$19,634	$22,730	$26,847
2/23	$18,821	$22,189	$26,528
3/23	$19,583	$22,891	$28,342
4/23	$18,371	$23,175	$28,621
5/23	$20,236	$23,283	$29,926
6/23	$22,029	$24,855	$31,972
7/23	$23,974	$25,710	$33,050
8/23	$21,753	$25,260	$32,753
9/23	$20,643	$24,073	$30,972
10/23	$18,835	$23,491	$30,531
11/23	$22,232	$25,685	$33,859
12/23	$24,976	$26,953	$35,358
1/24	$23,517	$27,329	$36,240
2/24	$26,282	$28,805	$38,713
3/24	$26,827	$29,728	$39,394
4/24	$24,279	$28,463	$37,723
5/24	$23,807	$29,804	$39,981
6/24	$25,005	$30,790	$42,677
7/24	$25,295	$31,238	$41,951
8/24	$26,943	$31,979	$42,825
9/24	$28,569	$32,663	$44,038
10/24	$30,688	$32,434	$43,893
11/24	$38,019	$34,522	$46,740
12/24	$36,534	$33,560	$47,152

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class A	46.28%	13.32%	14.45%
Class A, with 5.25% maximum front end sales charge	38.58%	12.10%	13.83%
Russell 1000^® Index	24.51%	14.28%	12.87%
Russell 1000^® Growth Index	33.36%	18.96%	16.78%

AssetsNet

$ 4,190,946,959

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 17,778,316

InvestmentCompanyPortfolioTurnover

39.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$4,190,946,959
# of Portfolio Holdings	33
Portfolio Turnover Rate	39%
Total Advisory Fees Paid	$17,778,316

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	2.8%
Investment Company	2.9%
Health Care	4.7%
Financials	9.7%
Communication Services	11.3%
Consumer Discretionary	33.3%
Information Technology	35.3%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Tesla, Inc.	9.1%
Cloudflare, Inc.	8.8%
DoorDash, Inc.	6.7%
Shopify, Inc.	6.4%
Trade Desk, Inc.	6.2%
Affirm Holdings, Inc.	6.2%
ROBLOX Corp.	5.1%
MercadoLibre, Inc.	4.9%
Samsara, Inc.	4.8%
Carvana Co.	4.6%
Total	62.8%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155892

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Growth Portfolio

Class Name

Class C

Trading Symbol

MSGUX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Growth Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$197	1.61%

Expenses Paid, Amount

$ 197

Expense Ratio, Percent

1.61%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the Russell 1000^® Growth Index:

↑ Stock selection and average overweight in consumer discretionary, led by a position in a leading seller of used cars online in the United States

↑ Stock selection in information technology, led by a position in an enterprise analytics platform and Bitcoin developing company

↑ Stock selection and an average underweight in industrials, led by a global mobility and food delivery platform

↓ Stock selection in health care, where a position in an underperforming health care services provider was the largest detractor

↓ Average underweight to information technology

Line Graph [Table Text Block]

	Class C	Russell 1000^® Index	Russell 1000^® Growth Index
4/15	$10,000	$10,000	$10,000
5/15	$10,015	$10,131	$10,141
6/15	$10,020	$9,941	$9,962
7/15	$10,581	$10,132	$10,300
8/15	$9,851	$9,523	$9,674
9/15	$9,413	$9,262	$9,435
10/15	$9,978	$10,011	$10,248
11/15	$10,321	$10,044	$10,276
12/15	$10,271	$9,864	$10,125
1/16	$9,279	$9,333	$9,560
2/16	$9,009	$9,330	$9,556
3/16	$9,677	$9,979	$10,201
4/16	$9,648	$10,034	$10,107
5/16	$9,902	$10,209	$10,304
6/16	$9,811	$10,233	$10,263
7/16	$10,474	$10,622	$10,748
8/16	$10,554	$10,636	$10,694
9/16	$10,853	$10,645	$10,733
10/16	$10,460	$10,437	$10,481
11/16	$10,178	$10,849	$10,709
12/16	$9,970	$11,053	$10,842
1/17	$10,973	$11,275	$11,207
2/17	$11,182	$11,711	$11,673
3/17	$11,556	$11,719	$11,808
4/17	$12,054	$11,843	$12,078
5/17	$12,805	$11,994	$12,392
6/17	$12,665	$12,077	$12,359
7/17	$13,062	$12,317	$12,688
8/17	$13,424	$12,355	$12,920
9/17	$13,249	$12,618	$13,088
10/17	$13,963	$12,908	$13,596
11/17	$14,240	$13,301	$14,009
12/17	$14,194	$13,450	$14,118
1/18	$15,548	$14,188	$15,118
2/18	$15,751	$13,667	$14,721
3/18	$15,540	$13,357	$14,317
4/18	$15,555	$13,402	$14,367
5/18	$16,593	$13,744	$14,997
6/18	$16,874	$13,833	$15,142
7/18	$16,816	$14,311	$15,586
8/18	$18,298	$14,804	$16,438
9/18	$18,133	$14,860	$16,530
10/18	$16,230	$13,808	$15,052
11/18	$16,411	$14,089	$15,212
12/18	$15,132	$12,806	$13,904
1/19	$16,956	$13,879	$15,154
2/19	$17,803	$14,349	$15,696
3/19	$18,035	$14,599	$16,143
4/19	$18,731	$15,189	$16,872
5/19	$18,059	$14,221	$15,806
6/19	$19,293	$15,219	$16,892
7/19	$19,411	$15,455	$17,273
8/19	$18,478	$15,172	$17,141
9/19	$17,168	$15,435	$17,143
10/19	$17,172	$15,762	$17,626
11/19	$18,637	$16,358	$18,408
12/19	$18,448	$16,831	$18,964
1/20	$19,585	$16,849	$19,387
2/20	$19,507	$15,472	$18,067
3/20	$17,696	$13,427	$16,290
4/20	$21,319	$15,202	$18,700
5/20	$25,253	$16,004	$19,956
6/20	$27,950	$16,358	$20,825
7/20	$30,843	$17,315	$22,427
8/20	$33,452	$18,586	$24,741
9/20	$33,888	$17,907	$23,577
10/20	$32,531	$17,475	$22,776
11/20	$38,731	$19,533	$25,108
12/20	$39,382	$20,359	$26,263
1/21	$39,921	$20,191	$26,069
2/21	$42,061	$20,776	$26,063
3/21	$38,589	$21,563	$26,511
4/21	$40,643	$22,723	$28,314
5/21	$39,520	$22,831	$27,923
6/21	$44,287	$23,403	$29,675
7/21	$44,231	$23,889	$30,653
8/21	$45,172	$24,581	$31,799
9/21	$42,274	$23,452	$30,018
10/21	$45,492	$25,079	$32,618
11/21	$43,952	$24,743	$32,817
12/21	$39,165	$25,745	$33,511
1/22	$30,455	$24,293	$30,635
2/22	$30,132	$23,627	$29,334
3/22	$28,631	$24,424	$30,481
4/22	$22,265	$22,247	$26,800
5/22	$18,512	$22,213	$26,177
6/22	$16,794	$20,353	$24,104
7/22	$19,046	$22,248	$26,997
8/22	$19,283	$21,394	$25,739
9/22	$17,314	$19,414	$23,237
10/22	$17,736	$20,971	$24,595
11/22	$17,242	$22,106	$25,716
12/22	$15,381	$20,821	$23,747
1/23	$18,106	$22,216	$25,726
2/23	$17,348	$21,688	$25,421
3/23	$18,035	$22,374	$27,158
4/23	$16,913	$22,651	$27,426
5/23	$18,631	$22,757	$28,676
6/23	$20,281	$24,294	$30,637
7/23	$22,072	$25,129	$31,669
8/23	$20,027	$24,689	$31,385
9/23	$19,005	$23,529	$29,678
10/23	$17,341	$22,960	$29,256
11/23	$20,468	$25,105	$32,445
12/23	$22,994	$26,344	$33,882
1/24	$21,651	$26,711	$34,727
2/24	$24,197	$28,154	$37,096
3/24	$24,698	$29,056	$37,749
4/24	$22,353	$27,820	$36,148
5/24	$21,918	$29,130	$38,312
6/24	$23,021	$30,094	$40,895
7/24	$23,288	$30,532	$40,200
8/24	$24,805	$31,256	$41,037
9/24	$26,302	$31,924	$42,200
10/24	$28,253	$31,701	$42,060
11/24	$35,003	$33,742	$44,788
12/24	$33,635	$32,801	$45,183

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 4/30/15 (Inception)
Class C, with conversion to Class A after 8 years	45.20%	12.48%	13.36%
Class C, with 1% maximum contingent deferred sales charge and conversion to Class A after 8 years	44.20%	12.48%	13.36%
Russell 1000^® Index	24.51%	14.28%	13.07%
Russell 1000^® Growth Index	33.36%	18.96%	16.88%

Performance Inception Date

Apr. 30, 2015

AssetsNet

$ 4,190,946,959

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 17,778,316

InvestmentCompanyPortfolioTurnover

39.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$4,190,946,959
# of Portfolio Holdings	33
Portfolio Turnover Rate	39%
Total Advisory Fees Paid	$17,778,316

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	2.8%
Investment Company	2.9%
Health Care	4.7%
Financials	9.7%
Communication Services	11.3%
Consumer Discretionary	33.3%
Information Technology	35.3%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Tesla, Inc.	9.1%
Cloudflare, Inc.	8.8%
DoorDash, Inc.	6.7%
Shopify, Inc.	6.4%
Trade Desk, Inc.	6.2%
Affirm Holdings, Inc.	6.2%
ROBLOX Corp.	5.1%
MercadoLibre, Inc.	4.9%
Samsara, Inc.	4.8%
Carvana Co.	4.6%
Total	62.8%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000007750

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Growth Portfolio

Class Name

Class I

Trading Symbol

MSEQX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Growth Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$75	0.61%

Expenses Paid, Amount

$ 75

Expense Ratio, Percent

0.61%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the Russell 1000^® Growth Index:

↑ Stock selection and average overweight in consumer discretionary, led by a position in a leading seller of used cars online in the United States

↑ Stock selection in information technology, led by a position in an enterprise analytics platform and Bitcoin developing company

↑ Stock selection and an average underweight in industrials, led by a global mobility and food delivery platform

↓ Stock selection in health care, where a position in an underperforming health care services provider was the largest detractor

↓ Average underweight to information technology

Line Graph [Table Text Block]

	Class I	Russell 1000^® Index	Russell 1000^® Growth Index
12/14	$1,000,000	$1,000,000	$1,000,000
1/15	$1,005,664	$972,533	$984,687
2/15	$1,082,389	$1,028,726	$1,050,322
3/15	$1,062,049	$1,015,916	$1,038,376
4/15	$1,081,874	$1,023,128	$1,043,577
5/15	$1,084,449	$1,036,513	$1,058,266
6/15	$1,085,994	$1,017,068	$1,039,623
7/15	$1,147,904	$1,036,672	$1,074,878
8/15	$1,069,491	$974,313	$1,009,602
9/15	$1,023,014	$947,609	$984,626
10/15	$1,085,329	$1,024,279	$1,069,408
11/15	$1,123,497	$1,027,663	$1,072,410
12/15	$1,119,137	$1,009,175	$1,056,673
1/16	$1,011,762	$954,857	$997,681
2/16	$982,704	$954,529	$997,256
3/16	$1,056,594	$1,021,022	$1,064,512
4/16	$1,054,380	$1,026,575	$1,054,791
5/16	$1,083,161	$1,044,552	$1,075,274
6/16	$1,074,305	$1,046,918	$1,071,051
7/16	$1,147,679	$1,086,799	$1,121,607
8/16	$1,157,365	$1,088,243	$1,116,035
9/16	$1,191,414	$1,089,105	$1,120,117
10/16	$1,149,147	$1,067,867	$1,093,813
11/16	$1,119,501	$1,109,966	$1,117,613
12/16	$1,097,751	$1,130,819	$1,131,448
1/17	$1,209,117	$1,153,558	$1,169,576
2/17	$1,233,137	$1,198,210	$1,218,155
3/17	$1,275,562	$1,198,967	$1,232,245
4/17	$1,331,713	$1,211,643	$1,260,426
5/17	$1,415,628	$1,227,106	$1,293,201
6/17	$1,401,590	$1,235,674	$1,289,794
7/17	$1,446,749	$1,260,145	$1,324,076
8/17	$1,487,929	$1,264,087	$1,348,348
9/17	$1,470,052	$1,291,006	$1,365,879
10/17	$1,550,179	$1,320,616	$1,418,803
11/17	$1,582,421	$1,360,890	$1,461,906
12/17	$1,578,866	$1,376,061	$1,473,287
1/18	$1,730,877	$1,451,597	$1,577,634
2/18	$1,754,380	$1,398,304	$1,536,267
3/18	$1,732,393	$1,366,566	$1,494,138
4/18	$1,735,805	$1,371,211	$1,499,358
5/18	$1,853,320	$1,406,212	$1,565,077
6/18	$1,886,300	$1,415,306	$1,580,146
7/18	$1,881,541	$1,464,150	$1,626,533
8/18	$2,048,505	$1,514,601	$1,715,466
9/18	$2,031,847	$1,520,352	$1,725,054
10/18	$1,819,946	$1,412,767	$1,570,788
11/18	$1,842,027	$1,441,518	$1,587,472
12/18	$1,699,814	$1,310,229	$1,450,985
1/19	$1,906,642	$1,420,030	$1,581,409
2/19	$2,002,727	$1,468,110	$1,637,991
3/19	$2,030,820	$1,493,669	$1,684,613
4/19	$2,111,026	$1,553,990	$1,760,724
5/19	$2,036,927	$1,454,963	$1,649,493
6/19	$2,177,798	$1,557,107	$1,762,775
7/19	$2,193,269	$1,581,289	$1,802,580
8/19	$2,089,855	$1,552,327	$1,788,774
9/19	$1,942,877	$1,579,234	$1,788,996
10/19	$1,944,913	$1,612,704	$1,839,431
11/19	$2,112,655	$1,673,650	$1,921,034
12/19	$2,093,495	$1,721,983	$1,978,994
1/20	$2,224,084	$1,723,841	$2,023,234
2/20	$2,216,854	$1,582,974	$1,885,448
3/20	$2,013,063	$1,373,785	$1,699,966
4/20	$2,426,972	$1,555,321	$1,951,512
5/20	$2,877,482	$1,637,382	$2,082,526
6/20	$3,187,010	$1,673,590	$2,173,209
7/20	$3,520,036	$1,771,589	$2,340,414
8/20	$3,820,526	$1,901,618	$2,581,926
9/20	$3,873,847	$1,832,118	$2,460,447
10/20	$3,721,568	$1,787,937	$2,376,885
11/20	$4,434,160	$1,998,480	$2,620,259
12/20	$4,513,043	$2,082,967	$2,740,768
1/21	$4,578,664	$2,065,812	$2,720,489
2/21	$4,827,333	$2,125,680	$2,719,859
3/21	$4,432,620	$2,206,123	$2,766,587
4/21	$4,672,408	$2,324,880	$2,954,822
5/21	$4,547,087	$2,335,916	$2,913,953
6/21	$5,099,684	$2,394,447	$3,096,768
7/21	$5,097,711	$2,444,189	$3,198,826
8/21	$5,210,697	$2,514,930	$3,318,426
9/21	$4,880,126	$2,399,409	$3,132,575
10/21	$5,255,596	$2,565,897	$3,403,905
11/21	$5,081,922	$2,531,477	$3,424,717
12/21	$4,532,250	$2,634,015	$3,497,125
1/22	$3,527,456	$2,485,509	$3,196,984
2/22	$3,492,682	$2,417,303	$3,061,197
3/22	$3,321,251	$2,498,876	$3,180,943
4/22	$2,584,890	$2,276,125	$2,796,807
5/22	$2,150,516	$2,272,665	$2,731,788
6/22	$1,952,851	$2,082,329	$2,515,399
7/22	$2,216,404	$2,276,276	$2,817,300
8/22	$2,246,298	$2,188,876	$2,686,059
9/22	$2,018,129	$1,986,345	$2,424,932
10/22	$2,069,376	$2,145,650	$2,566,666
11/22	$2,013,249	$2,261,724	$2,683,621
12/22	$1,797,597	$2,130,209	$2,478,172
1/23	$2,118,170	$2,273,029	$2,684,721
2/23	$2,030,996	$2,218,941	$2,652,836
3/23	$2,113,249	$2,289,133	$2,834,174
4/23	$1,983,192	$2,317,498	$2,862,136
5/23	$2,184,956	$2,328,292	$2,992,588
6/23	$2,378,986	$2,485,539	$3,197,237
7/23	$2,589,186	$2,571,013	$3,304,952
8/23	$2,350,163	$2,526,038	$3,275,277
9/23	$2,231,354	$2,407,324	$3,097,155
10/23	$2,035,917	$2,349,141	$3,053,059
11/23	$2,403,592	$2,568,540	$3,385,876
12/23	$2,700,965	$2,695,338	$3,535,809
1/24	$2,544,194	$2,732,927	$3,623,998
2/24	$2,843,676	$2,880,509	$3,871,252
3/24	$2,902,729	$2,972,850	$3,939,403
4/24	$2,627,852	$2,846,348	$3,772,310
5/24	$2,577,235	$2,980,382	$3,998,140
6/24	$2,707,292	$3,079,023	$4,267,741
7/24	$2,738,928	$3,123,832	$4,195,145
8/24	$2,918,195	$3,197,877	$4,282,521
9/24	$3,095,354	$3,266,253	$4,403,847
10/24	$3,325,238	$3,243,431	$4,389,274
11/24	$4,120,343	$3,452,240	$4,673,964
12/24	$3,960,408	$3,355,993	$4,715,222

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class I	46.63%	13.60%	14.76%
Russell 1000^® Index	24.51%	14.28%	12.87%
Russell 1000^® Growth Index	33.36%	18.96%	16.78%

AssetsNet

$ 4,190,946,959

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 17,778,316

InvestmentCompanyPortfolioTurnover

39.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$4,190,946,959
# of Portfolio Holdings	33
Portfolio Turnover Rate	39%
Total Advisory Fees Paid	$17,778,316

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	2.8%
Investment Company	2.9%
Health Care	4.7%
Financials	9.7%
Communication Services	11.3%
Consumer Discretionary	33.3%
Information Technology	35.3%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Tesla, Inc.	9.1%
Cloudflare, Inc.	8.8%
DoorDash, Inc.	6.7%
Shopify, Inc.	6.4%
Trade Desk, Inc.	6.2%
Affirm Holdings, Inc.	6.2%
ROBLOX Corp.	5.1%
MercadoLibre, Inc.	4.9%
Samsara, Inc.	4.8%
Carvana Co.	4.6%
Total	62.8%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000198816

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Growth Portfolio

Class Name

Class IR

Trading Symbol

MGHRX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Growth Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class IR	$64	0.52%

Expenses Paid, Amount

$ 64

Expense Ratio, Percent

0.52%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the Russell 1000^® Growth Index:

↑ Stock selection and average overweight in consumer discretionary, led by a position in a leading seller of used cars online in the United States

↑ Stock selection in information technology, led by a position in an enterprise analytics platform and Bitcoin developing company

↑ Stock selection and an average underweight in industrials, led by a global mobility and food delivery platform

↓ Stock selection in health care, where a position in an underperforming health care services provider was the largest detractor

↓ Average underweight to information technology

Line Graph [Table Text Block]

	Class IR	Russell 1000^® Index	Russell 1000^® Growth Index
6/18	$5,000,000	$5,000,000	$5,000,000
6/18	$4,798,696	$5,000,000	$5,000,000
7/18	$4,785,687	$5,059,461	$5,004,135
8/18	$5,211,756	$5,233,797	$5,277,743
9/18	$5,169,639	$5,253,671	$5,307,240
10/18	$4,630,931	$4,881,904	$4,832,630
11/18	$4,686,761	$4,981,253	$4,883,961
12/18	$4,326,237	$4,527,576	$4,464,050
1/19	$4,852,095	$4,907,002	$4,865,306
2/19	$5,098,044	$5,073,145	$5,039,385
3/19	$5,169,050	$5,161,466	$5,182,822
4/19	$5,373,837	$5,369,908	$5,416,981
5/19	$5,185,516	$5,027,714	$5,074,772
6/19	$5,544,663	$5,380,681	$5,423,290
7/19	$5,583,768	$5,464,242	$5,545,753
8/19	$5,320,325	$5,364,161	$5,503,279
9/19	$4,946,770	$5,457,141	$5,503,962
10/19	$4,952,944	$5,572,797	$5,659,128
11/19	$5,381,040	$5,783,401	$5,910,184
12/19	$5,332,721	$5,950,418	$6,088,501
1/20	$5,665,944	$5,956,841	$6,224,611
2/20	$5,647,685	$5,470,064	$5,800,704
3/20	$5,129,591	$4,747,199	$5,230,056
4/20	$6,184,039	$5,374,507	$6,003,954
5/20	$7,332,063	$5,658,073	$6,407,024
6/20	$8,121,757	$5,783,194	$6,686,018
7/20	$8,969,652	$6,121,835	$7,200,434
8/20	$9,736,523	$6,571,160	$7,943,463
9/20	$9,873,464	$6,330,999	$7,569,723
10/20	$9,485,464	$6,178,328	$7,312,641
11/20	$11,303,359	$6,905,870	$8,061,396
12/20	$11,504,929	$7,197,820	$8,432,148
1/21	$11,671,757	$7,138,539	$8,369,760
2/21	$12,306,701	$7,345,418	$8,367,823
3/21	$11,300,751	$7,623,393	$8,511,584
4/21	$11,913,285	$8,033,765	$9,090,701
5/21	$11,594,568	$8,071,901	$8,964,964
6/21	$13,005,139	$8,274,161	$9,527,406
7/21	$13,000,159	$8,446,046	$9,841,394
8/21	$13,288,996	$8,690,495	$10,209,353
9/21	$12,447,385	$8,291,305	$9,637,570
10/21	$13,407,270	$8,866,616	$10,472,333
11/21	$12,965,299	$8,747,674	$10,536,362
12/21	$11,564,756	$9,102,003	$10,759,130
1/22	$9,000,611	$8,588,829	$9,835,727
2/22	$8,913,092	$8,353,140	$9,417,969
3/22	$8,478,569	$8,635,019	$9,786,378
4/22	$6,597,684	$7,865,289	$8,604,558
5/22	$5,490,649	$7,853,334	$8,404,523
6/22	$4,987,032	$7,195,617	$7,738,789
7/22	$5,661,080	$7,865,813	$8,667,607
8/22	$5,736,315	$7,563,795	$8,263,835
9/22	$5,152,857	$6,863,936	$7,460,460
10/22	$5,281,832	$7,414,425	$7,896,512
11/22	$5,137,503	$7,815,529	$8,256,333
12/22	$4,578,500	$7,361,070	$7,624,255
1/23	$5,394,260	$7,854,591	$8,259,718
2/23	$5,175,312	$7,667,686	$8,161,623
3/23	$5,383,666	$7,910,240	$8,719,519
4/23	$5,053,477	$8,008,256	$8,805,547
5/23	$5,567,301	$8,045,556	$9,206,889
6/23	$6,063,467	$8,588,935	$9,836,507
7/23	$6,598,478	$8,884,294	$10,167,897
8/23	$5,989,307	$8,728,881	$10,076,601
9/23	$5,685,604	$8,318,657	$9,528,596
10/23	$5,189,438	$8,117,602	$9,392,932
11/23	$6,127,032	$8,875,748	$10,416,866
12/23	$6,882,759	$9,313,906	$10,878,145
1/24	$6,483,707	$9,443,798	$11,149,463
2/24	$7,248,262	$9,953,776	$11,910,158
3/24	$7,400,113	$10,272,866	$12,119,827
4/24	$6,699,124	$9,835,731	$11,605,755
5/24	$6,571,993	$10,298,893	$12,300,536
6/24	$6,903,947	$10,639,754	$13,129,981
7/24	$6,985,170	$10,794,593	$12,906,634
8/24	$7,442,490	$11,050,461	$13,175,452
9/24	$7,896,279	$11,286,740	$13,548,720
10/24	$8,484,262	$11,207,877	$13,503,884
11/24	$10,513,069	$11,929,429	$14,379,751
12/24	$10,104,589	$11,596,840	$14,506,684

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 6/15/18 (Inception)
Class IR	46.81%	13.64%	11.35%
Russell 1000^® Index	24.51%	14.28%	13.72%
Russell 1000^® Growth Index	33.36%	18.96%	17.67%

Performance Inception Date

Jun. 15, 2018

AssetsNet

$ 4,190,946,959

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 17,778,316

InvestmentCompanyPortfolioTurnover

39.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$4,190,946,959
# of Portfolio Holdings	33
Portfolio Turnover Rate	39%
Total Advisory Fees Paid	$17,778,316

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	2.8%
Investment Company	2.9%
Health Care	4.7%
Financials	9.7%
Communication Services	11.3%
Consumer Discretionary	33.3%
Information Technology	35.3%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Tesla, Inc.	9.1%
Cloudflare, Inc.	8.8%
DoorDash, Inc.	6.7%
Shopify, Inc.	6.4%
Trade Desk, Inc.	6.2%
Affirm Holdings, Inc.	6.2%
ROBLOX Corp.	5.1%
MercadoLibre, Inc.	4.9%
Samsara, Inc.	4.8%
Carvana Co.	4.6%
Total	62.8%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000113805

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Growth Portfolio

Class Name

Class L

Trading Symbol

MSHLX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Growth Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$167	1.36%

Expenses Paid, Amount

$ 167

Expense Ratio, Percent

1.36%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the Russell 1000^® Growth Index:

↑ Stock selection and average overweight in consumer discretionary, led by a position in a leading seller of used cars online in the United States

↑ Stock selection in information technology, led by a position in an enterprise analytics platform and Bitcoin developing company

↑ Stock selection and an average underweight in industrials, led by a global mobility and food delivery platform

↓ Stock selection in health care, where a position in an underperforming health care services provider was the largest detractor

↓ Average underweight to information technology

Line Graph [Table Text Block]

	Class L	Russell 1000^® Index	Russell 1000^® Growth Index
12/14	$10,000	$10,000	$10,000
1/15	$10,051	$9,725	$9,847
2/15	$10,811	$10,287	$10,503
3/15	$10,602	$10,159	$10,384
4/15	$10,789	$10,231	$10,436
5/15	$10,808	$10,365	$10,583
6/15	$10,816	$10,171	$10,396
7/15	$11,422	$10,367	$10,749
8/15	$10,634	$9,743	$10,096
9/15	$10,161	$9,476	$9,846
10/15	$10,774	$10,243	$10,694
11/15	$11,136	$10,277	$10,724
12/15	$11,085	$10,092	$10,567
1/16	$10,014	$9,549	$9,977
2/16	$9,722	$9,545	$9,973
3/16	$10,444	$10,210	$10,645
4/16	$10,415	$10,266	$10,548
5/16	$10,692	$10,446	$10,753
6/16	$10,597	$10,469	$10,711
7/16	$11,316	$10,868	$11,216
8/16	$11,402	$10,882	$11,160
9/16	$11,730	$10,891	$11,201
10/16	$11,306	$10,679	$10,938
11/16	$11,005	$11,100	$11,176
12/16	$10,784	$11,308	$11,314
1/17	$11,872	$11,536	$11,696
2/17	$12,101	$11,982	$12,182
3/17	$12,508	$11,990	$12,322
4/17	$13,048	$12,116	$12,604
5/17	$13,865	$12,271	$12,932
6/17	$13,714	$12,357	$12,898
7/17	$14,145	$12,601	$13,241
8/17	$14,539	$12,641	$13,483
9/17	$14,354	$12,910	$13,659
10/17	$15,130	$13,206	$14,188
11/17	$15,432	$13,609	$14,619
12/17	$15,387	$13,761	$14,733
1/18	$16,857	$14,516	$15,776
2/18	$17,076	$13,983	$15,363
3/18	$16,853	$13,666	$14,941
4/18	$16,874	$13,712	$14,994
5/18	$18,004	$14,062	$15,651
6/18	$18,316	$14,153	$15,801
7/18	$18,252	$14,642	$16,265
8/18	$19,866	$15,146	$17,155
9/18	$19,692	$15,204	$17,251
10/18	$17,630	$14,128	$15,708
11/18	$17,829	$14,415	$15,875
12/18	$16,447	$13,102	$14,510
1/19	$18,433	$14,200	$15,814
2/19	$19,353	$14,681	$16,380
3/19	$19,612	$14,937	$16,846
4/19	$20,370	$15,540	$17,607
5/19	$19,643	$14,550	$16,495
6/19	$20,993	$15,571	$17,628
7/19	$21,124	$15,813	$18,026
8/19	$20,116	$15,523	$17,888
9/19	$18,691	$15,792	$17,890
10/19	$18,700	$16,127	$18,394
11/19	$20,300	$16,736	$19,210
12/19	$20,101	$17,220	$19,790
1/20	$21,344	$17,238	$20,232
2/20	$21,260	$15,830	$18,854
3/20	$19,298	$13,738	$17,000
4/20	$23,247	$15,553	$19,515
5/20	$27,546	$16,374	$20,825
6/20	$30,495	$16,736	$21,732
7/20	$33,655	$17,716	$23,404
8/20	$36,510	$19,016	$25,819
9/20	$36,998	$18,321	$24,604
10/20	$35,519	$17,879	$23,769
11/20	$42,293	$19,985	$26,203
12/20	$43,019	$20,830	$27,408
1/21	$43,614	$20,658	$27,205
2/21	$45,960	$21,257	$27,199
3/21	$42,179	$22,061	$27,666
4/21	$44,432	$23,249	$29,548
5/21	$43,216	$23,359	$29,140
6/21	$48,437	$23,944	$30,968
7/21	$48,388	$24,442	$31,988
8/21	$49,424	$25,149	$33,184
9/21	$46,266	$23,994	$31,326
10/21	$49,795	$25,659	$34,039
11/21	$48,120	$25,315	$34,247
12/21	$42,891	$26,340	$34,971
1/22	$33,357	$24,855	$31,970
2/22	$33,013	$24,173	$30,612
3/22	$31,376	$24,989	$31,809
4/22	$24,400	$22,761	$27,968
5/22	$20,297	$22,727	$27,318
6/22	$18,414	$20,823	$25,154
7/22	$20,887	$22,763	$28,173
8/22	$21,154	$21,889	$26,861
9/22	$18,997	$19,863	$24,249
10/22	$19,468	$21,456	$25,667
11/22	$18,927	$22,617	$26,836
12/22	$16,885	$21,302	$24,782
1/23	$19,878	$22,730	$26,847
2/23	$19,048	$22,189	$26,528
3/23	$19,811	$22,891	$28,342
4/23	$18,579	$23,175	$28,621
5/23	$20,457	$23,283	$29,926
6/23	$22,260	$24,855	$31,972
7/23	$24,213	$25,710	$33,050
8/23	$21,966	$25,260	$32,753
9/23	$20,834	$24,073	$30,972
10/23	$19,007	$23,491	$30,531
11/23	$22,419	$25,685	$33,859
12/23	$25,177	$26,953	$35,358
1/24	$23,693	$27,329	$36,240
2/24	$26,477	$28,805	$38,713
3/24	$27,005	$29,728	$39,394
4/24	$24,431	$28,463	$37,723
5/24	$23,945	$29,804	$39,981
6/24	$25,144	$30,790	$42,677
7/24	$25,420	$31,238	$41,951
8/24	$27,072	$31,979	$42,825
9/24	$28,690	$32,663	$44,038
10/24	$30,803	$32,434	$43,893
11/24	$38,147	$34,522	$46,740
12/24	$36,638	$33,560	$47,152

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class L	45.52%	12.76%	13.87%
Russell 1000^® Index	24.51%	14.28%	12.87%
Russell 1000^® Growth Index	33.36%	18.96%	16.78%

AssetsNet

$ 4,190,946,959

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 17,778,316

InvestmentCompanyPortfolioTurnover

39.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$4,190,946,959
# of Portfolio Holdings	33
Portfolio Turnover Rate	39%
Total Advisory Fees Paid	$17,778,316

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	2.8%
Investment Company	2.9%
Health Care	4.7%
Financials	9.7%
Communication Services	11.3%
Consumer Discretionary	33.3%
Information Technology	35.3%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Tesla, Inc.	9.1%
Cloudflare, Inc.	8.8%
DoorDash, Inc.	6.7%
Shopify, Inc.	6.4%
Trade Desk, Inc.	6.2%
Affirm Holdings, Inc.	6.2%
ROBLOX Corp.	5.1%
MercadoLibre, Inc.	4.9%
Samsara, Inc.	4.8%
Carvana Co.	4.6%
Total	62.8%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000126914

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Growth Portfolio

Class Name

Class R6

Trading Symbol

MGRPX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Growth Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$64	0.52%

Expenses Paid, Amount

$ 64

Expense Ratio, Percent

0.52%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the Russell 1000^® Growth Index:

↑ Stock selection and average overweight in consumer discretionary, led by a position in a leading seller of used cars online in the United States

↑ Stock selection in information technology, led by a position in an enterprise analytics platform and Bitcoin developing company

↑ Stock selection and an average underweight in industrials, led by a global mobility and food delivery platform

↓ Stock selection in health care, where a position in an underperforming health care services provider was the largest detractor

↓ Average underweight to information technology

Line Graph [Table Text Block]

	Class R6	Russell 1000^® Index	Russell 1000^® Growth Index
12/14	$5,000,000	$5,000,000	$5,000,000
1/15	$5,028,270	$4,862,663	$4,923,436
2/15	$5,412,490	$5,143,631	$5,251,609
3/15	$5,310,974	$5,079,580	$5,191,882
4/15	$5,409,920	$5,115,638	$5,217,884
5/15	$5,422,770	$5,182,565	$5,291,331
6/15	$5,431,766	$5,085,341	$5,198,115
7/15	$5,740,757	$5,183,361	$5,374,388
8/15	$5,349,400	$4,871,566	$5,048,008
9/15	$5,116,142	$4,738,047	$4,923,131
10/15	$5,428,449	$5,121,396	$5,347,041
11/15	$5,620,240	$5,138,314	$5,362,050
12/15	$5,598,489	$5,045,874	$5,283,363
1/16	$5,061,288	$4,774,284	$4,988,406
2/16	$4,917,666	$4,772,646	$4,986,278
3/16	$5,287,768	$5,105,112	$5,322,559
4/16	$5,276,721	$5,132,875	$5,273,956
5/16	$5,420,342	$5,222,761	$5,376,372
6/16	$5,376,151	$5,234,588	$5,355,257
7/16	$5,745,076	$5,433,997	$5,608,036
8/16	$5,794,867	$5,441,216	$5,580,173
9/16	$5,964,745	$5,445,523	$5,600,585
10/16	$5,753,862	$5,339,335	$5,469,067
11/16	$5,605,952	$5,549,830	$5,588,064
12/16	$5,495,906	$5,654,094	$5,657,239
1/17	$6,054,521	$5,767,790	$5,847,880
2/17	$6,175,892	$5,991,050	$6,090,776
3/17	$6,389,068	$5,994,835	$6,161,223
4/17	$6,670,710	$6,058,214	$6,302,132
5/17	$7,092,395	$6,135,531	$6,466,004
6/17	$7,020,817	$6,178,371	$6,448,969
7/17	$7,247,604	$6,300,725	$6,620,378
8/17	$7,454,587	$6,320,434	$6,741,738
9/17	$7,365,425	$6,455,028	$6,829,394
10/17	$7,768,247	$6,603,080	$7,094,014
11/17	$7,929,057	$6,804,448	$7,309,528
12/17	$7,913,205	$6,880,305	$7,366,434
1/18	$8,674,490	$7,257,987	$7,888,170
2/18	$8,793,500	$6,991,521	$7,681,336
3/18	$8,683,935	$6,832,830	$7,470,689
4/18	$8,700,937	$6,856,054	$7,496,788
5/18	$9,290,319	$7,031,062	$7,825,383
6/18	$9,456,554	$7,076,529	$7,900,729
7/18	$9,430,918	$7,320,750	$8,132,667
8/18	$10,270,551	$7,573,004	$8,577,332
9/18	$10,187,553	$7,601,761	$8,625,271
10/18	$9,125,947	$7,063,835	$7,853,939
11/18	$9,235,968	$7,207,588	$7,937,361
12/18	$8,525,502	$6,551,143	$7,254,926
1/19	$9,561,784	$7,100,150	$7,907,044
2/19	$10,046,464	$7,340,551	$8,189,956
3/19	$10,186,393	$7,468,346	$8,423,067
4/19	$10,589,955	$7,769,949	$8,803,620
5/19	$10,218,840	$7,274,815	$8,247,465
6/19	$10,926,595	$7,785,537	$8,813,873
7/19	$11,003,657	$7,906,445	$9,012,899
8/19	$10,484,502	$7,761,634	$8,943,871
9/19	$9,748,356	$7,896,170	$8,944,981
10/19	$9,760,523	$8,063,518	$9,197,155
11/19	$10,604,151	$8,368,250	$9,605,169
12/19	$10,508,703	$8,609,914	$9,894,968
1/20	$11,165,356	$8,619,207	$10,116,171
2/20	$11,129,375	$7,914,870	$9,427,242
3/20	$10,108,414	$6,868,924	$8,499,832
4/20	$12,186,317	$7,776,603	$9,757,562
5/20	$14,448,623	$8,186,908	$10,412,628
6/20	$16,007,050	$8,367,951	$10,866,045
7/20	$17,677,918	$8,857,945	$11,702,069
8/20	$19,189,121	$9,508,092	$12,909,631
9/20	$19,458,978	$9,160,592	$12,302,233
10/20	$18,694,382	$8,939,687	$11,884,426
11/20	$22,274,492	$9,992,399	$13,101,294
12/20	$22,673,960	$10,414,834	$13,703,838
1/21	$23,002,710	$10,329,058	$13,602,445
2/21	$24,253,924	$10,628,399	$13,599,297
3/21	$22,271,609	$11,030,613	$13,832,936
4/21	$23,478,662	$11,624,398	$14,774,110
5/21	$22,850,602	$11,679,579	$14,569,764
6/21	$25,630,259	$11,972,237	$15,483,839
7/21	$25,620,446	$12,220,945	$15,994,129
8/21	$26,189,626	$12,574,648	$16,592,132
9/21	$24,531,154	$11,997,043	$15,662,876
10/21	$26,422,695	$12,829,485	$17,019,524
11/21	$25,551,752	$12,657,384	$17,123,583
12/21	$22,789,401	$13,170,077	$17,485,623
1/22	$17,739,545	$12,427,544	$15,984,918
2/22	$17,567,082	$12,086,515	$15,305,983
3/22	$16,707,790	$12,494,378	$15,904,717
4/22	$13,004,361	$11,380,623	$13,984,036
5/22	$10,822,847	$11,363,324	$13,658,941
6/22	$9,827,400	$10,411,645	$12,576,997
7/22	$11,155,672	$11,381,381	$14,086,502
8/22	$11,306,956	$10,944,378	$13,430,296
9/22	$10,160,224	$9,931,723	$12,124,660
10/22	$10,420,432	$10,728,249	$12,833,328
11/22	$10,136,019	$11,308,622	$13,418,104
12/22	$9,051,606	$10,651,046	$12,390,859
1/23	$10,665,728	$11,365,143	$13,423,605
2/23	$10,230,889	$11,094,703	$13,264,182
3/23	$10,644,855	$11,445,664	$14,170,870
4/23	$9,990,858	$11,587,488	$14,310,682
5/23	$11,006,641	$11,641,458	$14,962,938
6/23	$11,984,159	$12,427,697	$15,986,187
7/23	$13,045,166	$12,855,064	$16,524,758
8/23	$11,838,053	$12,630,191	$16,376,384
9/23	$11,239,715	$12,036,620	$15,485,773
10/23	$10,258,718	$11,745,705	$15,265,294
11/23	$12,109,393	$12,842,699	$16,929,379
12/23	$13,605,238	$13,476,689	$17,679,045
1/24	$12,815,571	$13,664,634	$18,119,989
2/24	$14,328,810	$14,402,543	$19,356,262
3/24	$14,627,979	$14,864,248	$19,697,014
4/24	$13,243,452	$14,231,740	$18,861,550
5/24	$12,989,506	$14,901,908	$19,990,700
6/24	$13,646,983	$15,395,115	$21,338,705
7/24	$13,803,525	$15,619,158	$20,975,724
8/24	$14,711,468	$15,989,384	$21,412,605
9/24	$15,602,018	$16,331,266	$22,019,235
10/24	$16,763,908	$16,217,156	$21,946,368
11/24	$20,774,861	$17,261,200	$23,369,819
12/24	$19,966,626	$16,779,963	$23,576,108

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class R6	46.76%	13.70%	14.85%
Russell 1000^® Index	24.51%	14.28%	12.87%
Russell 1000^® Growth Index	33.36%	18.96%	16.78%

AssetsNet

$ 4,190,946,959

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 17,778,316

InvestmentCompanyPortfolioTurnover

39.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$4,190,946,959
# of Portfolio Holdings	33
Portfolio Turnover Rate	39%
Total Advisory Fees Paid	$17,778,316

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	2.8%
Investment Company	2.9%
Health Care	4.7%
Financials	9.7%
Communication Services	11.3%
Consumer Discretionary	33.3%
Information Technology	35.3%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Tesla, Inc.	9.1%
Cloudflare, Inc.	8.8%
DoorDash, Inc.	6.7%
Shopify, Inc.	6.4%
Trade Desk, Inc.	6.2%
Affirm Holdings, Inc.	6.2%
ROBLOX Corp.	5.1%
MercadoLibre, Inc.	4.9%
Samsara, Inc.	4.8%
Carvana Co.	4.6%
Total	62.8%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000007745

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Inception Portfolio

Class Name

Class A

Trading Symbol

MSSMX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Inception Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$147	1.28%

Expenses Paid, Amount

$ 147

Expense Ratio, Percent

1.28%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the Russell 2000^® Growth Index:

↑ Stock selection and average overweight in information technology, led by a position in an enterprise analytics platform and Bitcoin developing company

↑ Stock selection in consumer discretionary, led by a position in a leading seller of used cars online in the United States

↑ Average underweight in health care, which was one of the weaker performing sectors in the period

↓ Stock selection in health care, where a position in an underperforming health care services provider was the largest detractor in the portfolio

↓ Stock selection in communication services, due to a holding in a financial services advertising platform that underperformed

↓ Average underweight in industrials, a sector that outperformed the index

Line Graph [Table Text Block]

	Class A with maximum sales charge	Russell 3000^® Index	Russell 2000^® Growth Index
12/14	$9,472	$10,000	$10,000
1/15	$9,034	$9,722	$9,772
2/15	$9,714	$10,285	$10,475
3/15	$9,847	$10,180	$10,663
4/15	$9,752	$10,226	$10,349
5/15	$9,924	$10,368	$10,730
6/15	$10,165	$10,194	$10,874
7/15	$10,210	$10,365	$10,918
8/15	$9,116	$9,739	$10,091
9/15	$8,581	$9,455	$9,453
10/15	$8,829	$10,202	$9,990
11/15	$8,931	$10,258	$10,356
12/15	$8,536	$10,048	$9,862
1/16	$7,554	$9,481	$8,793
2/16	$7,407	$9,478	$8,731
3/16	$7,944	$10,145	$9,400
4/16	$8,062	$10,208	$9,494
5/16	$8,188	$10,391	$9,750
6/16	$8,397	$10,412	$9,705
7/16	$8,971	$10,825	$10,339
8/16	$8,999	$10,853	$10,449
9/16	$8,956	$10,870	$10,600
10/16	$8,331	$10,635	$9,941
11/16	$8,658	$11,111	$10,830
12/16	$8,474	$11,327	$10,978
1/17	$8,864	$11,541	$11,156
2/17	$8,676	$11,970	$11,430
3/17	$8,995	$11,978	$11,565
4/17	$9,493	$12,105	$11,778
5/17	$9,826	$12,229	$11,671
6/17	$9,754	$12,339	$12,073
7/17	$9,732	$12,572	$12,176
8/17	$9,595	$12,596	$12,161
9/17	$9,627	$12,903	$12,823
10/17	$10,024	$13,185	$13,022
11/17	$10,145	$13,585	$13,396
12/17	$10,302	$13,721	$13,411
1/18	$10,692	$14,444	$13,934
2/18	$10,795	$13,912	$13,538
3/18	$10,577	$13,633	$13,720
4/18	$10,612	$13,684	$13,733
5/18	$11,540	$14,071	$14,598
6/18	$11,964	$14,163	$14,712
7/18	$11,861	$14,633	$14,965
8/18	$12,984	$15,147	$15,897
9/18	$12,892	$15,172	$15,525
10/18	$11,253	$14,055	$13,560
11/18	$11,402	$14,336	$13,772
12/18	$10,304	$13,002	$12,163
1/19	$11,861	$14,118	$13,568
2/19	$13,229	$14,614	$14,444
3/19	$13,444	$14,828	$14,248
4/19	$13,699	$15,420	$14,682
5/19	$13,471	$14,422	$13,593
6/19	$14,262	$15,435	$14,640
7/19	$15,161	$15,664	$14,783
8/19	$13,846	$15,345	$14,145
9/19	$12,840	$15,614	$14,029
10/19	$13,095	$15,950	$14,428
11/19	$14,289	$16,557	$15,278
12/19	$14,087	$17,035	$15,628
1/20	$14,981	$17,016	$15,456
2/20	$14,633	$15,623	$14,340
3/20	$11,687	$13,475	$11,601
4/20	$14,749	$15,259	$13,329
5/20	$17,977	$16,075	$14,589
6/20	$20,212	$16,443	$15,149
7/20	$22,364	$17,376	$15,670
8/20	$24,830	$18,635	$16,589
9/20	$24,168	$17,957	$16,234
10/20	$23,059	$17,569	$16,357
11/20	$29,465	$19,707	$19,241
12/20	$35,198	$20,593	$21,040
1/21	$46,843	$20,501	$22,054
2/21	$48,595	$21,142	$22,782
3/21	$43,489	$21,900	$22,066
4/21	$45,976	$23,029	$22,547
5/21	$43,621	$23,134	$21,903
6/21	$48,294	$23,705	$22,930
7/21	$44,883	$24,105	$22,095
8/21	$43,564	$24,793	$22,496
9/21	$40,455	$23,681	$21,634
10/21	$41,661	$25,282	$22,647
11/21	$37,233	$24,897	$21,541
12/21	$33,896	$25,877	$21,636
1/22	$26,680	$24,355	$18,736
2/22	$25,756	$23,741	$18,818
3/22	$24,986	$24,512	$18,904
4/22	$19,850	$22,312	$16,585
5/22	$17,796	$22,282	$16,272
6/22	$15,921	$20,418	$15,264
7/22	$17,975	$22,333	$16,973
8/22	$17,410	$21,500	$16,814
9/22	$15,741	$19,506	$15,301
10/22	$15,921	$21,106	$16,754
11/22	$14,765	$22,208	$17,026
12/22	$13,704	$20,907	$15,933
1/23	$16,558	$22,347	$17,518
2/23	$16,455	$21,825	$17,329
3/23	$16,584	$22,408	$16,901
4/23	$15,478	$22,647	$16,705
5/23	$16,918	$22,735	$16,708
6/23	$19,566	$24,288	$18,093
7/23	$21,469	$25,158	$18,939
8/23	$19,695	$24,673	$17,953
9/23	$18,203	$23,497	$16,769
10/23	$15,838	$22,875	$15,476
11/23	$17,638	$25,008	$16,885
12/23	$21,134	$26,334	$18,906
1/24	$19,232	$26,626	$18,300
2/24	$20,954	$28,067	$19,787
3/24	$21,751	$28,973	$20,340
4/24	$18,820	$27,698	$18,774
5/24	$18,846	$29,006	$19,779
6/24	$19,232	$29,904	$19,746
7/24	$19,849	$30,460	$21,363
8/24	$19,823	$31,123	$21,126
9/24	$20,826	$31,767	$21,407
10/24	$22,189	$31,534	$21,123
11/24	$28,462	$33,632	$23,713
12/24	$27,292	$32,604	$21,772

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class A	29.14%	14.14%	11.16%
Class A, with 5.25% maximum front end sales charge	22.29%	12.92%	10.56%
Russell 3000^® Index	23.81%	13.86%	12.55%
Russell 2000^® Growth Index	15.15%	6.86%	8.09%

AssetsNet

$ 383,113,019

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 2,623,653

InvestmentCompanyPortfolioTurnover

100.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$383,113,019
# of Portfolio Holdings	55
Portfolio Turnover Rate	100%
Total Advisory Fees Paid	$2,623,653

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Materials	0.2%
Real Estate	1.2%
Industrials	3.0%
Investment Companies	3.1%
Communication Services	6.8%
Financials	6.8%
Short-Term Investments	7.4%
Consumer Staples	8.1%
Health Care	16.1%
Consumer Discretionary	20.4%
Information Technology	26.9%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Global-e Online Ltd.	8.2%
Peloton Interactive, Inc.	7.9%
Cloudflare, Inc.	7.3%
Affirm Holdings, Inc.	5.8%
Roivant Sciences Ltd.	4.8%
ZoomInfo Technologies, Inc.	4.8%
Bill Holdings, Inc.	4.7%
IonQ, Inc.	4.7%
Oddity Tech Ltd.	4.6%
Aurora Innovation, Inc.	4.3%
Total	57.1%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155889

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Inception Portfolio

Class Name

Class C

Trading Symbol

MSCOX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Inception Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$238	2.09%

Expenses Paid, Amount

$ 238

Expense Ratio, Percent

2.09%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the Russell 2000^® Growth Index:

↑ Stock selection and average overweight in information technology, led by a position in an enterprise analytics platform and Bitcoin developing company

↑ Stock selection in consumer discretionary, led by a position in a leading seller of used cars online in the United States

↑ Average underweight in health care, which was one of the weaker performing sectors in the period

↓ Stock selection in health care, where a position in an underperforming health care services provider was the largest detractor in the portfolio

↓ Stock selection in communication services, due to a holding in a financial services advertising platform that underperformed

↓ Average underweight in industrials, a sector that outperformed the index

Line Graph [Table Text Block]

	Class C	Russell 3000^® Index	Russell 2000^® Growth Index
5/17	$10,000	$10,000	$10,000
6/17	$9,919	$10,090	$10,344
7/17	$9,889	$10,280	$10,432
8/17	$9,741	$10,300	$10,420
9/17	$9,765	$10,552	$10,987
10/17	$10,169	$10,782	$11,158
11/17	$10,285	$11,109	$11,478
12/17	$10,436	$11,220	$11,491
1/18	$10,822	$11,812	$11,939
2/18	$10,915	$11,376	$11,599
3/18	$10,705	$11,148	$11,755
4/18	$10,728	$11,190	$11,767
5/18	$11,663	$11,506	$12,508
6/18	$12,072	$11,581	$12,606
7/18	$11,967	$11,966	$12,822
8/18	$13,089	$12,386	$13,621
9/18	$12,984	$12,406	$13,302
10/18	$11,324	$11,493	$11,619
11/18	$11,465	$11,723	$11,800
12/18	$10,355	$10,632	$10,422
1/19	$11,905	$11,545	$11,625
2/19	$13,276	$11,951	$12,376
3/19	$13,482	$12,125	$12,208
4/19	$13,729	$12,609	$12,580
5/19	$13,482	$11,793	$11,647
6/19	$14,264	$12,622	$12,544
7/19	$15,155	$12,809	$12,666
8/19	$13,839	$12,548	$12,120
9/19	$12,824	$12,768	$12,020
10/19	$13,057	$13,043	$12,362
11/19	$14,250	$13,539	$13,090
12/19	$14,029	$13,930	$13,390
1/20	$14,914	$13,915	$13,243
2/20	$14,556	$12,776	$12,287
3/20	$11,628	$11,019	$9,940
4/20	$14,659	$12,478	$11,421
5/20	$17,842	$13,145	$12,500
6/20	$20,055	$13,446	$12,980
7/20	$22,184	$14,209	$13,426
8/20	$24,601	$15,239	$14,214
9/20	$23,937	$14,684	$13,909
10/20	$22,814	$14,367	$14,015
11/20	$29,130	$16,115	$16,486
12/20	$34,786	$16,840	$18,027
1/21	$46,265	$16,765	$18,896
2/21	$47,960	$17,289	$19,520
3/21	$42,893	$17,908	$18,906
4/21	$45,329	$18,832	$19,318
5/21	$42,971	$18,918	$18,767
6/21	$47,531	$19,384	$19,647
7/21	$44,160	$19,712	$18,931
8/21	$42,835	$20,274	$19,275
9/21	$39,756	$19,364	$18,536
10/21	$40,925	$20,674	$19,404
11/21	$36,540	$20,359	$18,457
12/21	$33,265	$21,161	$18,538
1/22	$26,158	$19,916	$16,054
2/22	$25,239	$19,414	$16,124
3/22	$24,483	$20,044	$16,197
4/22	$19,429	$18,245	$14,210
5/22	$17,403	$18,221	$13,942
6/22	$15,565	$16,696	$13,079
7/22	$17,565	$18,263	$14,543
8/22	$16,997	$17,581	$14,406
9/22	$15,349	$15,951	$13,110
10/22	$15,538	$17,259	$14,355
11/22	$14,403	$18,160	$14,589
12/22	$13,340	$17,097	$13,652
1/23	$16,100	$18,274	$15,010
2/23	$15,992	$17,847	$14,848
3/23	$16,127	$18,324	$14,481
4/23	$15,018	$18,519	$14,313
5/23	$16,425	$18,591	$14,315
6/23	$18,968	$19,861	$15,502
7/23	$20,809	$20,573	$16,227
8/23	$19,077	$20,176	$15,383
9/23	$17,616	$19,215	$14,368
10/23	$15,315	$18,705	$13,260
11/23	$17,047	$20,450	$14,467
12/23	$20,403	$21,534	$16,199
1/24	$18,563	$21,773	$15,680
2/24	$20,213	$22,952	$16,953
3/24	$20,971	$23,692	$17,428
4/24	$18,130	$22,649	$16,086
5/24	$18,157	$23,720	$16,947
6/24	$18,508	$24,454	$16,919
7/24	$19,077	$24,908	$18,304
8/24	$19,050	$25,451	$18,101
9/24	$19,970	$25,977	$18,342
10/24	$21,269	$25,786	$18,098
11/24	$27,276	$27,502	$20,318
12/24	$26,127	$26,661	$18,654

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 5/31/17 (Inception)
Class C	28.06%	13.24%	13.50%
Class C, with 1% maximum contingent deferred sales charge	27.06%	13.24%	13.50%
Russell 3000^® Index	23.81%	13.86%	13.80%
Russell 2000^® Growth Index	15.15%	6.86%	8.57%

Performance Inception Date

May 31, 2017

AssetsNet

$ 383,113,019

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 2,623,653

InvestmentCompanyPortfolioTurnover

100.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$383,113,019
# of Portfolio Holdings	55
Portfolio Turnover Rate	100%
Total Advisory Fees Paid	$2,623,653

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Materials	0.2%
Real Estate	1.2%
Industrials	3.0%
Investment Companies	3.1%
Communication Services	6.8%
Financials	6.8%
Short-Term Investments	7.4%
Consumer Staples	8.1%
Health Care	16.1%
Consumer Discretionary	20.4%
Information Technology	26.9%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Global-e Online Ltd.	8.2%
Peloton Interactive, Inc.	7.9%
Cloudflare, Inc.	7.3%
Affirm Holdings, Inc.	5.8%
Roivant Sciences Ltd.	4.8%
ZoomInfo Technologies, Inc.	4.8%
Bill Holdings, Inc.	4.7%
IonQ, Inc.	4.7%
Oddity Tech Ltd.	4.6%
Aurora Innovation, Inc.	4.3%
Total	57.1%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000007744

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Inception Portfolio

Class Name

Class I

Trading Symbol

MSSGX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Inception Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$108	0.94%

Expenses Paid, Amount

$ 108

Expense Ratio, Percent

0.94%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the Russell 2000^® Growth Index:

↑ Stock selection and average overweight in information technology, led by a position in an enterprise analytics platform and Bitcoin developing company

↑ Stock selection in consumer discretionary, led by a position in a leading seller of used cars online in the United States

↑ Average underweight in health care, which was one of the weaker performing sectors in the period

↓ Stock selection in health care, where a position in an underperforming health care services provider was the largest detractor in the portfolio

↓ Stock selection in communication services, due to a holding in a financial services advertising platform that underperformed

↓ Average underweight in industrials, a sector that outperformed the index

Line Graph [Table Text Block]

	Class I	Russell 3000^® Index	Russell 2000^® Growth Index
12/14	$1,000,000	$1,000,000	$1,000,000
1/15	$954,573	$972,168	$977,170
2/15	$1,026,045	$1,028,458	$1,047,493
3/15	$1,040,581	$1,018,003	$1,066,298
4/15	$1,030,285	$1,022,607	$1,034,930
5/15	$1,049,061	$1,036,751	$1,072,954
6/15	$1,075,106	$1,019,406	$1,087,378
7/15	$1,080,008	$1,036,456	$1,091,817
8/15	$964,791	$973,886	$1,009,079
9/15	$908,396	$945,507	$945,349
10/15	$934,471	$1,020,188	$998,972
11/15	$945,386	$1,025,843	$1,035,579
12/15	$904,156	$1,004,788	$986,183
1/16	$800,260	$948,092	$879,331
2/16	$785,136	$947,787	$873,115
3/16	$842,345	$1,014,517	$940,001
4/16	$854,839	$1,020,804	$949,374
5/16	$867,990	$1,039,067	$974,951
6/16	$890,347	$1,041,203	$970,466
7/16	$951,738	$1,082,526	$1,033,923
8/16	$955,083	$1,085,287	$1,044,914
9/16	$951,070	$1,086,993	$1,059,959
10/16	$884,856	$1,063,475	$994,088
11/16	$920,304	$1,111,068	$1,083,028
12/16	$900,968	$1,132,748	$1,097,801
1/17	$942,416	$1,154,069	$1,115,625
2/17	$922,032	$1,196,991	$1,142,981
3/17	$956,684	$1,197,805	$1,156,520
4/17	$1,009,683	$1,210,501	$1,177,819
5/17	$1,045,694	$1,222,890	$1,167,107
6/17	$1,038,220	$1,233,926	$1,207,277
7/17	$1,036,185	$1,257,191	$1,217,553
8/17	$1,021,929	$1,259,613	$1,216,131
9/17	$1,025,680	$1,290,333	$1,282,350
10/17	$1,068,448	$1,318,490	$1,302,217
11/17	$1,081,204	$1,358,527	$1,339,604
12/17	$1,097,986	$1,372,105	$1,341,147
1/18	$1,140,294	$1,444,429	$1,393,427
2/18	$1,151,374	$1,391,188	$1,353,754
3/18	$1,129,213	$1,363,261	$1,371,984
4/18	$1,132,235	$1,368,443	$1,373,327
5/18	$1,231,960	$1,407,074	$1,459,793
6/18	$1,276,283	$1,416,276	$1,471,215
7/18	$1,267,217	$1,463,277	$1,496,508
8/18	$1,387,089	$1,514,664	$1,589,677
9/18	$1,377,015	$1,517,171	$1,552,473
10/18	$1,202,748	$1,405,458	$1,356,029
11/18	$1,217,858	$1,433,607	$1,377,242
12/18	$1,101,159	$1,300,182	$1,216,313
1/19	$1,268,279	$1,411,782	$1,356,777
2/19	$1,414,795	$1,461,433	$1,444,396
3/19	$1,437,688	$1,482,773	$1,424,848
4/19	$1,465,160	$1,541,983	$1,468,238
5/19	$1,441,122	$1,442,198	$1,359,308
6/19	$1,525,827	$1,543,493	$1,464,004
7/19	$1,623,122	$1,566,437	$1,478,313
8/19	$1,482,330	$1,534,505	$1,414,520
9/19	$1,375,877	$1,561,437	$1,402,910
10/19	$1,402,204	$1,595,050	$1,442,830
11/19	$1,531,550	$1,655,680	$1,527,753
12/19	$1,509,807	$1,703,486	$1,562,761
1/20	$1,605,518	$1,701,625	$1,545,555
2/20	$1,569,121	$1,562,308	$1,433,968
3/20	$1,255,027	$1,347,463	$1,160,117
4/20	$1,582,602	$1,525,921	$1,332,909
5/20	$1,929,049	$1,607,525	$1,458,866
6/20	$2,169,000	$1,644,276	$1,514,929
7/20	$2,402,211	$1,737,643	$1,566,989
8/20	$2,666,428	$1,863,526	$1,658,913
9/20	$2,596,329	$1,795,673	$1,623,367
10/20	$2,477,702	$1,756,917	$1,635,702
11/20	$3,165,203	$1,970,651	$1,924,133
12/20	$3,783,112	$2,059,307	$2,103,982
1/21	$5,036,231	$2,050,147	$2,205,424
2/21	$5,224,793	$2,114,229	$2,278,242
3/21	$4,676,924	$2,190,009	$2,206,556
4/21	$4,945,662	$2,302,902	$2,254,667
5/21	$4,691,772	$2,313,415	$2,190,274
6/21	$5,195,098	$2,370,461	$2,292,997
7/21	$4,831,337	$2,410,547	$2,209,482
8/21	$4,688,802	$2,479,291	$2,249,638
9/21	$4,356,221	$2,368,050	$2,163,384
10/21	$4,488,363	$2,528,188	$2,264,686
11/21	$4,011,762	$2,489,706	$2,154,079
12/21	$3,657,178	$2,587,747	$2,163,626
1/22	$2,879,843	$2,435,494	$1,873,638
2/22	$2,779,899	$2,374,146	$1,881,812
3/22	$2,696,613	$2,451,154	$1,890,416
4/22	$2,143,225	$2,231,182	$1,658,476
5/22	$1,922,980	$2,228,191	$1,627,157
6/22	$1,719,392	$2,041,783	$1,526,429
7/22	$1,943,338	$2,233,339	$1,697,331
8/22	$1,880,411	$2,149,993	$1,681,378
9/22	$1,700,884	$1,950,626	$1,530,121
10/22	$1,723,093	$2,110,589	$1,675,362
11/22	$1,599,090	$2,220,753	$1,702,641
12/22	$1,484,075	$2,090,721	$1,593,348
1/23	$1,790,549	$2,234,714	$1,751,842
2/23	$1,781,261	$2,182,483	$1,732,865
3/23	$1,796,121	$2,240,841	$1,690,107
4/23	$1,675,389	$2,264,715	$1,670,472
5/23	$1,833,269	$2,273,527	$1,670,772
6/23	$2,121,169	$2,428,776	$1,809,303
7/23	$2,325,484	$2,515,839	$1,893,893
8/23	$2,134,170	$2,467,274	$1,795,306
9/23	$1,974,433	$2,349,748	$1,676,887
10/23	$1,718,109	$2,287,459	$1,547,563
11/23	$1,913,138	$2,500,760	$1,688,450
12/23	$2,292,051	$2,633,405	$1,890,642
1/24	$2,087,735	$2,662,591	$1,830,010
2/24	$2,275,334	$2,806,718	$1,978,654
3/24	$2,362,633	$2,897,256	$2,033,988
4/24	$2,045,014	$2,769,771	$1,877,373
5/24	$2,048,729	$2,900,635	$1,977,908
6/24	$2,091,450	$2,990,431	$1,974,612
7/24	$2,160,174	$3,046,020	$2,136,256
8/24	$2,156,459	$3,112,328	$2,112,602
9/24	$2,266,047	$3,176,709	$2,140,679
10/24	$2,414,640	$3,153,381	$2,112,276
11/24	$3,100,026	$3,363,157	$2,371,274
12/24	$2,971,441	$3,260,361	$2,177,155

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class I	29.64%	14.50%	11.51%
Russell 3000^® Index	23.81%	13.86%	12.55%
Russell 2000^® Growth Index	15.15%	6.86%	8.09%

AssetsNet

$ 383,113,019

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 2,623,653

InvestmentCompanyPortfolioTurnover

100.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$383,113,019
# of Portfolio Holdings	55
Portfolio Turnover Rate	100%
Total Advisory Fees Paid	$2,623,653

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Materials	0.2%
Real Estate	1.2%
Industrials	3.0%
Investment Companies	3.1%
Communication Services	6.8%
Financials	6.8%
Short-Term Investments	7.4%
Consumer Staples	8.1%
Health Care	16.1%
Consumer Discretionary	20.4%
Information Technology	26.9%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Global-e Online Ltd.	8.2%
Peloton Interactive, Inc.	7.9%
Cloudflare, Inc.	7.3%
Affirm Holdings, Inc.	5.8%
Roivant Sciences Ltd.	4.8%
ZoomInfo Technologies, Inc.	4.8%
Bill Holdings, Inc.	4.7%
IonQ, Inc.	4.7%
Oddity Tech Ltd.	4.6%
Aurora Innovation, Inc.	4.3%
Total	57.1%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000104303

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Inception Portfolio

Class Name

Class L

Trading Symbol

MSSLX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Inception Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$211	1.85%

Expenses Paid, Amount

$ 211

Expense Ratio, Percent

1.85%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the Russell 2000^® Growth Index:

↑ Stock selection and average overweight in information technology, led by a position in an enterprise analytics platform and Bitcoin developing company

↑ Stock selection in consumer discretionary, led by a position in a leading seller of used cars online in the United States

↑ Average underweight in health care, which was one of the weaker performing sectors in the period

↓ Stock selection in health care, where a position in an underperforming health care services provider was the largest detractor in the portfolio

↓ Stock selection in communication services, due to a holding in a financial services advertising platform that underperformed

↓ Average underweight in industrials, a sector that outperformed the index

Line Graph [Table Text Block]

	Class L	Russell 3000^® Index	Russell 2000^® Growth Index
12/14	$10,000	$10,000	$10,000
1/15	$9,541	$9,722	$9,772
2/15	$10,246	$10,285	$10,475
3/15	$10,390	$10,180	$10,663
4/15	$10,281	$10,226	$10,349
5/15	$10,452	$10,368	$10,730
6/15	$10,705	$10,194	$10,874
7/15	$10,754	$10,365	$10,918
8/15	$9,595	$9,739	$10,091
9/15	$9,026	$9,455	$9,453
10/15	$9,280	$10,202	$9,990
11/15	$9,383	$10,258	$10,356
12/15	$8,964	$10,048	$9,862
1/16	$7,934	$9,481	$8,793
2/16	$7,776	$9,478	$8,731
3/16	$8,333	$10,145	$9,400
4/16	$8,453	$10,208	$9,494
5/16	$8,581	$10,391	$9,750
6/16	$8,799	$10,412	$9,705
7/16	$9,396	$10,825	$10,339
8/16	$9,426	$10,853	$10,449
9/16	$9,373	$10,870	$10,600
10/16	$8,713	$10,635	$9,941
11/16	$9,051	$11,111	$10,830
12/16	$8,859	$11,327	$10,978
1/17	$9,258	$11,541	$11,156
2/17	$9,063	$11,970	$11,430
3/17	$9,383	$11,978	$11,565
4/17	$9,899	$12,105	$11,778
5/17	$10,250	$12,229	$11,671
6/17	$10,164	$12,339	$12,073
7/17	$10,140	$12,572	$12,176
8/17	$9,990	$12,596	$12,161
9/17	$10,026	$12,903	$12,823
10/17	$10,439	$13,185	$13,022
11/17	$10,553	$13,585	$13,396
12/17	$10,715	$13,721	$13,411
1/18	$11,121	$14,444	$13,934
2/18	$11,209	$13,912	$13,538
3/18	$10,981	$13,633	$13,720
4/18	$11,019	$13,684	$13,733
5/18	$11,969	$14,071	$14,598
6/18	$12,400	$14,163	$14,712
7/18	$12,299	$14,633	$14,965
8/18	$13,451	$15,147	$15,897
9/18	$13,337	$15,172	$15,525
10/18	$11,653	$14,055	$13,560
11/18	$11,792	$14,336	$13,772
12/18	$10,654	$13,002	$12,163
1/19	$12,259	$14,118	$13,568
2/19	$13,670	$14,614	$14,444
3/19	$13,880	$14,828	$14,248
4/19	$14,135	$15,420	$14,682
5/19	$13,880	$14,422	$13,593
6/19	$14,690	$15,435	$14,640
7/19	$15,605	$15,664	$14,783
8/19	$14,255	$15,345	$14,145
9/19	$13,220	$15,614	$14,029
10/19	$13,460	$15,950	$14,428
11/19	$14,690	$16,557	$15,278
12/19	$14,480	$17,035	$15,628
1/20	$15,387	$17,016	$15,456
2/20	$15,028	$15,623	$14,340
3/20	$12,003	$13,475	$11,601
4/20	$15,122	$15,259	$13,329
5/20	$18,430	$16,075	$14,589
6/20	$20,717	$16,443	$15,149
7/20	$22,910	$17,376	$15,670
8/20	$25,424	$18,635	$16,589
9/20	$24,725	$17,957	$16,234
10/20	$23,591	$17,569	$16,357
11/20	$30,112	$19,707	$19,241
12/20	$35,981	$20,593	$21,040
1/21	$47,836	$20,501	$22,054
2/21	$49,607	$21,142	$22,782
3/21	$44,380	$21,900	$22,066
4/21	$46,895	$23,029	$22,547
5/21	$44,445	$23,134	$21,903
6/21	$49,192	$23,705	$22,930
7/21	$45,692	$24,105	$22,095
8/21	$44,336	$24,793	$22,496
9/21	$41,164	$23,681	$21,634
10/21	$42,367	$25,282	$22,647
11/21	$37,840	$24,897	$21,541
12/21	$34,480	$25,877	$21,636
1/22	$27,114	$24,355	$18,736
2/22	$26,173	$23,741	$18,818
3/22	$25,358	$24,512	$18,904
4/22	$20,155	$22,312	$16,585
5/22	$18,055	$22,282	$16,272
6/22	$16,143	$20,418	$15,264
7/22	$18,243	$22,333	$16,973
8/22	$17,616	$21,500	$16,814
9/22	$15,923	$19,506	$15,301
10/22	$16,111	$21,106	$16,754
11/22	$14,952	$22,208	$17,026
12/22	$13,875	$20,907	$15,933
1/23	$16,732	$22,347	$17,518
2/23	$16,638	$21,825	$17,329
3/23	$16,763	$22,408	$16,901
4/23	$15,602	$22,647	$16,705
5/23	$17,046	$22,735	$16,708
6/23	$19,714	$24,288	$18,093
7/23	$21,629	$25,158	$18,939
8/23	$19,840	$24,673	$17,953
9/23	$18,333	$23,497	$16,769
10/23	$15,947	$22,875	$15,476
11/23	$17,737	$25,008	$16,885
12/23	$21,221	$26,334	$18,906
1/24	$19,306	$26,626	$18,300
2/24	$21,033	$28,067	$19,787
3/24	$21,818	$28,973	$20,340
4/24	$18,867	$27,698	$18,774
5/24	$18,898	$29,006	$19,779
6/24	$19,275	$29,904	$19,746
7/24	$19,871	$30,460	$21,363
8/24	$19,840	$31,123	$21,126
9/24	$20,813	$31,767	$21,407
10/24	$22,163	$31,534	$21,123
11/24	$28,441	$33,632	$23,713
12/24	$27,232	$32,604	$21,772

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class L	28.33%	13.47%	10.54%
Russell 3000^® Index	23.81%	13.86%	12.55%
Russell 2000^® Growth Index	15.15%	6.86%	8.09%

AssetsNet

$ 383,113,019

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 2,623,653

InvestmentCompanyPortfolioTurnover

100.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$383,113,019
# of Portfolio Holdings	55
Portfolio Turnover Rate	100%
Total Advisory Fees Paid	$2,623,653

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Materials	0.2%
Real Estate	1.2%
Industrials	3.0%
Investment Companies	3.1%
Communication Services	6.8%
Financials	6.8%
Short-Term Investments	7.4%
Consumer Staples	8.1%
Health Care	16.1%
Consumer Discretionary	20.4%
Information Technology	26.9%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Global-e Online Ltd.	8.2%
Peloton Interactive, Inc.	7.9%
Cloudflare, Inc.	7.3%
Affirm Holdings, Inc.	5.8%
Roivant Sciences Ltd.	4.8%
ZoomInfo Technologies, Inc.	4.8%
Bill Holdings, Inc.	4.7%
IonQ, Inc.	4.7%
Oddity Tech Ltd.	4.6%
Aurora Innovation, Inc.	4.3%
Total	57.1%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000129402

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Inception Portfolio

Class Name

Class R6

Trading Symbol

MFLLX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Inception Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$107	0.93%

Expenses Paid, Amount

$ 107

Expense Ratio, Percent

0.93%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the Russell 2000^® Growth Index:

↑ Stock selection and average overweight in information technology, led by a position in an enterprise analytics platform and Bitcoin developing company

↑ Stock selection in consumer discretionary, led by a position in a leading seller of used cars online in the United States

↑ Average underweight in health care, which was one of the weaker performing sectors in the period

↓ Stock selection in health care, where a position in an underperforming health care services provider was the largest detractor in the portfolio

↓ Stock selection in communication services, due to a holding in a financial services advertising platform that underperformed

↓ Average underweight in industrials, a sector that outperformed the index

Line Graph [Table Text Block]

	Class R6	Russell 3000^® Index	Russell 2000^® Growth Index
12/14	$5,000,000	$5,000,000	$5,000,000
1/15	$4,773,002	$4,860,842	$4,885,849
2/15	$5,130,145	$5,142,290	$5,237,464
3/15	$5,205,811	$5,090,013	$5,331,492
4/15	$5,154,358	$5,113,037	$5,174,650
5/15	$5,248,184	$5,183,757	$5,364,771
6/15	$5,378,329	$5,097,030	$5,436,889
7/15	$5,405,856	$5,182,280	$5,459,086
8/15	$4,827,090	$4,869,429	$5,045,393
9/15	$4,545,283	$4,727,534	$4,726,744
10/15	$4,675,581	$5,100,940	$4,994,859
11/15	$4,733,154	$5,129,217	$5,177,897
12/15	$4,524,104	$5,023,938	$4,930,917
1/16	$4,004,998	$4,740,461	$4,396,655
2/16	$3,929,432	$4,738,934	$4,365,575
3/16	$4,215,269	$5,072,584	$4,700,003
4/16	$4,277,693	$5,104,021	$4,746,870
5/16	$4,346,688	$5,195,334	$4,874,756
6/16	$4,458,394	$5,206,017	$4,852,330
7/16	$4,765,176	$5,412,628	$5,169,616
8/16	$4,785,226	$5,426,434	$5,224,570
9/16	$4,761,835	$5,434,965	$5,299,794
10/16	$4,431,013	$5,317,376	$4,970,439
11/16	$4,608,119	$5,555,340	$5,415,139
12/16	$4,511,519	$5,663,742	$5,489,003
1/17	$4,718,594	$5,770,345	$5,578,126
2/17	$4,620,148	$5,984,953	$5,714,906
3/17	$4,793,277	$5,989,025	$5,782,599
4/17	$5,058,061	$6,052,507	$5,889,095
5/17	$5,241,373	$6,114,448	$5,835,536
6/17	$5,204,032	$6,169,628	$6,036,386
7/17	$5,193,870	$6,285,956	$6,087,766
8/17	$5,122,670	$6,298,067	$6,080,654
9/17	$5,141,407	$6,451,663	$6,411,748
10/17	$5,355,008	$6,592,452	$6,511,084
11/17	$5,418,713	$6,792,633	$6,698,019
12/17	$5,507,522	$6,860,525	$6,705,735
1/18	$5,718,576	$7,222,147	$6,967,137
2/18	$5,773,852	$6,955,941	$6,768,771
3/18	$5,663,300	$6,816,307	$6,859,922
4/18	$5,678,375	$6,842,214	$6,866,635
5/18	$6,180,886	$7,035,372	$7,298,965
6/18	$6,407,016	$7,081,382	$7,356,074
7/18	$6,356,765	$7,316,384	$7,482,538
8/18	$6,959,779	$7,573,319	$7,948,385
9/18	$6,909,527	$7,585,855	$7,762,367
10/18	$6,035,158	$7,027,288	$6,780,146
11/18	$6,115,560	$7,168,035	$6,886,208
12/18	$5,528,630	$6,500,910	$6,081,566
1/19	$6,361,633	$7,058,910	$6,783,883
2/19	$7,103,348	$7,307,165	$7,221,979
3/19	$7,217,458	$7,413,863	$7,124,242
4/19	$7,354,390	$7,709,913	$7,341,188
5/19	$7,228,869	$7,210,990	$6,796,539
6/19	$7,662,487	$7,717,466	$7,320,019
7/19	$8,141,749	$7,832,186	$7,391,564
8/19	$7,439,972	$7,672,525	$7,072,600
9/19	$6,903,655	$7,807,184	$7,014,548
10/19	$7,040,587	$7,975,248	$7,214,149
11/19	$7,685,309	$8,278,402	$7,638,764
12/19	$7,576,701	$8,517,431	$7,813,806
1/20	$8,059,892	$8,508,127	$7,727,774
2/20	$7,871,985	$7,811,539	$7,169,842
3/20	$6,294,903	$6,737,313	$5,800,584
4/20	$7,945,806	$7,629,604	$6,664,546
5/20	$9,683,950	$8,037,624	$7,294,331
6/20	$10,891,928	$8,221,379	$7,574,646
7/20	$12,059,639	$8,688,216	$7,834,947
8/20	$13,388,414	$9,317,629	$8,294,565
9/20	$13,032,732	$8,978,365	$8,116,837
10/20	$12,442,165	$8,784,583	$8,178,512
11/20	$15,898,322	$9,853,255	$9,620,667
12/20	$19,001,801	$10,296,534	$10,519,908
1/21	$25,293,886	$10,250,735	$11,027,120
2/21	$26,246,561	$10,571,145	$11,391,212
3/21	$23,491,927	$10,950,045	$11,032,780
4/21	$24,843,396	$11,514,512	$11,273,333
5/21	$23,573,163	$11,567,075	$10,951,370
6/21	$26,098,859	$11,852,306	$11,464,985
7/21	$24,267,360	$12,052,736	$11,047,411
8/21	$23,558,393	$12,396,454	$11,248,190
9/21	$21,889,366	$11,840,251	$10,816,921
10/21	$22,554,023	$12,640,942	$11,323,428
11/21	$20,161,258	$12,448,531	$10,770,397
12/21	$18,375,800	$12,938,737	$10,818,128
1/22	$14,468,989	$12,177,472	$9,368,188
2/22	$13,972,595	$11,870,730	$9,409,060
3/22	$13,558,932	$12,255,772	$9,452,079
4/22	$10,773,606	$11,155,911	$8,292,378
5/22	$9,661,314	$11,140,954	$8,135,786
6/22	$8,640,947	$10,208,916	$7,632,145
7/22	$9,771,624	$11,166,696	$8,486,656
8/22	$9,459,079	$10,749,963	$8,406,889
9/22	$8,558,214	$9,753,128	$7,650,604
10/22	$8,668,524	$10,552,943	$8,376,810
11/22	$8,043,434	$11,103,767	$8,513,206
12/22	$7,462,765	$10,453,603	$7,966,741
1/23	$9,014,429	$11,173,571	$8,759,210
2/23	$8,959,013	$10,912,414	$8,664,324
3/23	$9,042,138	$11,204,203	$8,450,537
4/23	$8,432,555	$11,323,577	$8,352,359
5/23	$9,217,623	$11,367,634	$8,353,862
6/23	$10,667,690	$12,143,878	$9,046,514
7/23	$11,702,133	$12,579,197	$9,469,467
8/23	$10,741,579	$12,336,371	$8,976,532
9/23	$9,938,039	$11,748,738	$8,384,433
10/23	$8,644,986	$11,437,294	$7,737,815
11/23	$9,624,012	$12,503,802	$8,442,252
12/23	$11,535,883	$13,167,027	$9,453,211
1/24	$10,501,441	$13,312,954	$9,150,051
2/24	$11,443,522	$14,033,591	$9,893,268
3/24	$11,886,855	$14,486,278	$10,169,938
4/24	$10,279,774	$13,848,857	$9,386,863
5/24	$10,307,483	$14,503,174	$9,889,541
6/24	$10,519,913	$14,952,155	$9,873,061
7/24	$10,861,648	$15,230,100	$10,681,280
8/24	$10,852,412	$15,561,640	$10,563,010
9/24	$11,397,342	$15,883,546	$10,703,393
10/24	$12,145,466	$15,766,903	$10,561,382
11/24	$15,590,529	$16,815,783	$11,856,369
12/24	$14,943,415	$16,301,804	$10,885,773

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class R6	29.54%	14.55%	11.57%
Russell 3000^® Index	23.81%	13.86%	12.55%
Russell 2000^® Growth Index	15.15%	6.86%	8.09%

AssetsNet

$ 383,113,019

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 2,623,653

InvestmentCompanyPortfolioTurnover

100.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$383,113,019
# of Portfolio Holdings	55
Portfolio Turnover Rate	100%
Total Advisory Fees Paid	$2,623,653

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Materials	0.2%
Real Estate	1.2%
Industrials	3.0%
Investment Companies	3.1%
Communication Services	6.8%
Financials	6.8%
Short-Term Investments	7.4%
Consumer Staples	8.1%
Health Care	16.1%
Consumer Discretionary	20.4%
Information Technology	26.9%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Global-e Online Ltd.	8.2%
Peloton Interactive, Inc.	7.9%
Cloudflare, Inc.	7.3%
Affirm Holdings, Inc.	5.8%
Roivant Sciences Ltd.	4.8%
ZoomInfo Technologies, Inc.	4.8%
Bill Holdings, Inc.	4.7%
IonQ, Inc.	4.7%
Oddity Tech Ltd.	4.6%
Aurora Innovation, Inc.	4.3%
Total	57.1%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000094900

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Advantage Portfolio

Class Name

Class A

Trading Symbol

MFAPX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - International Advantage Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$132	1.28%

Expenses Paid, Amount

$ 132

Expense Ratio, Percent

1.28%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World ex USA Net Index:

↑ Stock selection in communication services, led by a Swedish audio streaming platform, which was the largest positive contributor in the portfolio

↑ Stock selection in information technology, led by a holding in a Taiwanese semiconductor foundry service provider

↑ No exposure to materials

↓ Stock selection in consumer discretionary, where exposure to an Italian luxury brand was the main detractor

↓ Stock selection in financials, where a position in a Pan-Asian life insurance group was the main detractor

↓ Stock selection in health care, where a provider of products and solutions in the aesthetic dentistry market was the largest detractor across the portfolio

Line Graph [Table Text Block]

	Class A with maximum sales charge	MSCI All Country World ex USA Net Index
12/14	$9,472	$10,000
1/15	$9,740	$9,985
2/15	$10,237	$10,519
3/15	$10,107	$10,349
4/15	$10,636	$10,872
5/15	$10,666	$10,702
6/15	$10,628	$10,403
7/15	$10,655	$10,375
8/15	$10,046	$9,582
9/15	$9,890	$9,137
10/15	$10,734	$9,818
11/15	$10,687	$9,615
12/15	$10,412	$9,434
1/16	$10,006	$8,792
2/16	$9,742	$8,692
3/16	$10,271	$9,398
4/16	$10,332	$9,646
5/16	$10,420	$9,483
6/16	$10,403	$9,338
7/16	$11,037	$9,800
8/16	$10,861	$9,862
9/16	$11,108	$9,983
10/16	$10,985	$9,840
11/16	$10,641	$9,612
12/16	$10,633	$9,858
1/17	$11,189	$10,207
2/17	$11,575	$10,370
3/17	$12,184	$10,633
4/17	$12,749	$10,860
5/17	$13,484	$11,213
6/17	$13,511	$11,248
7/17	$14,164	$11,662
8/17	$14,559	$11,723
9/17	$14,703	$11,941
10/17	$14,811	$12,165
11/17	$14,927	$12,264
12/17	$15,331	$12,538
1/18	$16,155	$13,237
2/18	$15,624	$12,613
3/18	$16,090	$12,390
4/18	$16,319	$12,588
5/18	$16,923	$12,297
6/18	$16,649	$12,066
7/18	$16,612	$12,355
8/18	$16,731	$12,096
9/18	$16,612	$12,151
10/18	$15,046	$11,163
11/18	$15,192	$11,269
12/18	$14,491	$10,758
1/19	$15,581	$11,571
2/19	$16,167	$11,797
3/19	$16,791	$11,868
4/19	$17,276	$12,181
5/19	$16,726	$11,527
6/19	$17,481	$12,222
7/19	$17,136	$12,074
8/19	$17,238	$11,701
9/19	$17,359	$12,002
10/19	$17,890	$12,421
11/19	$18,552	$12,530
12/19	$18,797	$13,073
1/20	$18,508	$12,722
2/20	$17,623	$11,716
3/20	$16,140	$10,020
4/20	$17,371	$10,779
5/20	$18,173	$11,132
6/20	$19,254	$11,635
7/20	$20,327	$12,153
8/20	$21,585	$12,674
9/20	$21,986	$12,362
10/20	$21,613	$12,096
11/20	$23,301	$13,724
12/20	$24,794	$14,465
1/21	$24,412	$14,497
2/21	$25,335	$14,784
3/21	$25,018	$14,971
4/21	$26,539	$15,411
5/21	$27,331	$15,893
6/21	$27,182	$15,790
7/21	$27,807	$15,530
8/21	$28,358	$15,825
9/21	$26,800	$15,319
10/21	$28,274	$15,684
11/21	$27,966	$14,978
12/21	$27,984	$15,597
1/22	$24,751	$15,022
2/22	$22,913	$14,725
3/22	$22,593	$14,748
4/22	$20,218	$13,822
5/22	$19,728	$13,922
6/22	$17,899	$12,724
7/22	$19,652	$13,160
8/22	$18,022	$12,736
9/22	$15,693	$11,464
10/22	$16,297	$11,806
11/22	$19,049	$13,200
12/22	$18,285	$13,101
1/23	$20,751	$14,164
2/23	$20,051	$13,666
3/23	$21,520	$14,001
4/23	$21,569	$14,244
5/23	$21,165	$13,726
6/23	$22,181	$14,342
7/23	$22,171	$14,925
8/23	$20,692	$14,251
9/23	$18,966	$13,801
10/23	$17,979	$13,231
11/23	$20,100	$14,422
12/23	$21,589	$15,147
1/24	$21,717	$14,996
2/24	$22,832	$15,376
3/24	$22,970	$15,857
4/24	$21,402	$15,572
5/24	$22,270	$16,024
6/24	$22,112	$16,009
7/24	$22,329	$16,379
8/24	$23,414	$16,846
9/24	$24,252	$17,300
10/24	$23,059	$16,451
11/24	$23,354	$16,302
12/24	$23,019	$15,985

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class A	6.62%	4.14%	9.29%
Class A, with 5.25% maximum front end sales charge	1.04%	3.02%	8.69%
MSCI All Country World ex USA Net Index	5.53%	4.10%	4.80%

AssetsNet

$ 2,744,697,984

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 23,306,085

InvestmentCompanyPortfolioTurnover

26.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,744,697,984
# of Portfolio Holdings	34
Portfolio Turnover Rate	26%
Total Advisory Fees Paid	$23,306,085

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	15.6%
Netherlands	5.4%
Italy	5.4%
Taiwan	5.5%
Switzerland	5.7%
Sweden	6.1%
United States	7.8%
India	8.2%
Denmark	8.3%
Canada	10.6%
France	21.4%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Hermes International SCA	8.8%
DSV AS	8.3%
Spotify Technology SA	6.1%
Taiwan Semiconductor Manufacturing Co. Ltd.	5.5%
Moncler SpA	5.4%
Schneider Electric SE	5.2%
MercadoLibre, Inc.	4.4%
Keyence Corp.	4.1%
L'Oreal SA	3.8%
ASML Holding NV	3.8%
Total	55.4%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155904

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Advantage Portfolio

Class Name

Class C

Trading Symbol

MSIAX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - International Advantage Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$206	2.00%

Expenses Paid, Amount

$ 206

Expense Ratio, Percent

2.00%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World ex USA Net Index:

↑ Stock selection in communication services, led by a Swedish audio streaming platform, which was the largest positive contributor in the portfolio

↑ Stock selection in information technology, led by a holding in a Taiwanese semiconductor foundry service provider

↑ No exposure to materials

↓ Stock selection in consumer discretionary, where exposure to an Italian luxury brand was the main detractor

↓ Stock selection in financials, where a position in a Pan-Asian life insurance group was the main detractor

↓ Stock selection in health care, where a provider of products and solutions in the aesthetic dentistry market was the largest detractor across the portfolio

Line Graph [Table Text Block]

	Class C	MSCI All Country World ex USA Net Index
4/15	$10,000	$10,000
5/15	$10,022	$9,844
6/15	$9,986	$9,569
7/15	$10,004	$9,543
8/15	$9,428	$8,813
9/15	$9,272	$8,405
10/15	$10,056	$9,030
11/15	$10,004	$8,844
12/15	$9,737	$8,677
1/16	$9,353	$8,087
2/16	$9,103	$7,995
3/16	$9,587	$8,645
4/16	$9,645	$8,872
5/16	$9,720	$8,722
6/16	$9,687	$8,589
7/16	$10,279	$9,014
8/16	$10,112	$9,071
9/16	$10,338	$9,183
10/16	$10,212	$9,051
11/16	$9,887	$8,841
12/16	$9,871	$9,067
1/17	$10,381	$9,389
2/17	$10,737	$9,538
3/17	$11,297	$9,780
4/17	$11,807	$9,989
5/17	$12,477	$10,314
6/17	$12,494	$10,346
7/17	$13,096	$10,727
8/17	$13,453	$10,783
9/17	$13,571	$10,983
10/17	$13,665	$11,190
11/17	$13,767	$11,281
12/17	$14,132	$11,533
1/18	$14,869	$12,175
2/18	$14,383	$11,601
3/18	$14,800	$11,397
4/18	$14,999	$11,578
5/18	$15,545	$11,311
6/18	$15,285	$11,099
7/18	$15,241	$11,364
8/18	$15,345	$11,126
9/18	$15,215	$11,177
10/18	$13,775	$10,268
11/18	$13,905	$10,365
12/18	$13,259	$9,896
1/19	$14,247	$10,643
2/19	$14,777	$10,851
3/19	$15,333	$10,916
4/19	$15,765	$11,204
5/19	$15,253	$10,603
6/19	$15,933	$11,242
7/19	$15,607	$11,105
8/19	$15,695	$10,763
9/19	$15,792	$11,039
10/19	$16,269	$11,425
11/19	$16,860	$11,525
12/19	$17,067	$12,024
1/20	$16,801	$11,701
2/20	$15,988	$10,777
3/20	$14,636	$9,216
4/20	$15,741	$9,915
5/20	$16,457	$10,239
6/20	$17,429	$10,702
7/20	$18,383	$11,179
8/20	$19,515	$11,657
9/20	$19,859	$11,371
10/20	$19,515	$11,126
11/20	$21,026	$12,623
12/20	$22,362	$13,305
1/21	$21,999	$13,334
2/21	$22,822	$13,598
3/21	$22,521	$13,770
4/21	$23,874	$14,176
5/21	$24,581	$14,619
6/21	$24,431	$14,524
7/21	$24,970	$14,285
8/21	$25,457	$14,556
9/21	$24,033	$14,090
10/21	$25,351	$14,427
11/21	$25,059	$13,777
12/21	$25,059	$14,346
1/22	$22,153	$13,818
2/22	$20,490	$13,544
3/22	$20,195	$13,566
4/22	$18,068	$12,714
5/22	$17,612	$12,805
6/22	$15,967	$11,704
7/22	$17,522	$12,104
8/22	$16,065	$11,715
9/22	$13,982	$10,544
10/22	$14,510	$10,859
11/22	$16,950	$12,141
12/22	$16,262	$12,050
1/23	$18,438	$13,028
2/23	$17,810	$12,571
3/23	$19,095	$12,878
4/23	$19,133	$13,102
5/23	$18,774	$12,625
6/23	$19,675	$13,192
7/23	$19,667	$13,728
8/23	$18,354	$13,108
9/23	$16,823	$12,694
10/23	$15,948	$12,170
11/23	$17,829	$13,266
12/23	$19,150	$13,932
1/24	$19,264	$13,794
2/24	$20,253	$14,143
3/24	$20,375	$14,585
4/24	$18,984	$14,323
5/24	$19,754	$14,739
6/24	$19,614	$14,725
7/24	$19,807	$15,066
8/24	$20,769	$15,495
9/24	$21,512	$15,912
10/24	$20,454	$15,132
11/24	$20,716	$14,995
12/24	$20,419	$14,703

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 4/30/15 (Inception)
Class C, with conversion to Class A after 8 years	5.86%	3.40%	7.66%
Class C, with 1% maximum contingent deferred sales charge and conversion to Class A after 8 years	4.86%	3.40%	7.66%
MSCI All Country World ex USA Net Index	5.53%	4.10%	4.07%

Performance Inception Date

Apr. 30, 2015

AssetsNet

$ 2,744,697,984

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 23,306,085

InvestmentCompanyPortfolioTurnover

26.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,744,697,984
# of Portfolio Holdings	34
Portfolio Turnover Rate	26%
Total Advisory Fees Paid	$23,306,085

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	15.6%
Netherlands	5.4%
Italy	5.4%
Taiwan	5.5%
Switzerland	5.7%
Sweden	6.1%
United States	7.8%
India	8.2%
Denmark	8.3%
Canada	10.6%
France	21.4%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Hermes International SCA	8.8%
DSV AS	8.3%
Spotify Technology SA	6.1%
Taiwan Semiconductor Manufacturing Co. Ltd.	5.5%
Moncler SpA	5.4%
Schneider Electric SE	5.2%
MercadoLibre, Inc.	4.4%
Keyence Corp.	4.1%
L'Oreal SA	3.8%
ASML Holding NV	3.8%
Total	55.4%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000094898

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Advantage Portfolio

Class Name

Class I

Trading Symbol

MFAIX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - International Advantage Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$103	1.00%

Expenses Paid, Amount

$ 103

Expense Ratio, Percent

1.00%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World ex USA Net Index:

↑ Stock selection in communication services, led by a Swedish audio streaming platform, which was the largest positive contributor in the portfolio

↑ Stock selection in information technology, led by a holding in a Taiwanese semiconductor foundry service provider

↑ No exposure to materials

↓ Stock selection in consumer discretionary, where exposure to an Italian luxury brand was the main detractor

↓ Stock selection in financials, where a position in a Pan-Asian life insurance group was the main detractor

↓ Stock selection in health care, where a provider of products and solutions in the aesthetic dentistry market was the largest detractor across the portfolio

Line Graph [Table Text Block]

	Class I	MSCI All Country World ex USA Net Index
12/14	$1,000,000	$1,000,000
1/15	$1,028,317	$998,518
2/15	$1,081,715	$1,051,901
3/15	$1,067,961	$1,034,899
4/15	$1,124,595	$1,087,181
5/15	$1,127,832	$1,070,204
6/15	$1,124,595	$1,040,349
7/15	$1,127,511	$1,037,456
8/15	$1,063,129	$958,158
9/15	$1,046,621	$913,734
10/15	$1,135,765	$981,755
11/15	$1,131,638	$961,488
12/15	$1,102,331	$943,379
1/16	$1,060,364	$879,207
2/16	$1,031,453	$869,158
3/16	$1,088,342	$939,829
4/16	$1,095,802	$964,564
5/16	$1,105,128	$948,283
6/16	$1,103,263	$933,775
7/16	$1,171,343	$979,953
8/16	$1,152,691	$986,151
9/16	$1,179,736	$998,311
10/16	$1,166,680	$983,958
11/16	$1,130,309	$961,198
12/16	$1,129,510	$985,785
1/17	$1,189,257	$1,020,706
2/17	$1,230,986	$1,036,982
3/17	$1,295,475	$1,063,271
4/17	$1,355,222	$1,086,034
5/17	$1,433,937	$1,121,275
6/17	$1,437,731	$1,124,757
7/17	$1,507,768	$1,166,213
8/17	$1,550,495	$1,172,315
9/17	$1,565,686	$1,194,078
10/17	$1,578,029	$1,216,542
11/17	$1,591,322	$1,226,424
12/17	$1,634,982	$1,253,836
1/18	$1,722,104	$1,323,669
2/18	$1,666,927	$1,261,255
3/18	$1,716,295	$1,239,011
4/18	$1,741,464	$1,258,792
5/18	$1,806,321	$1,229,727
6/18	$1,778,249	$1,206,613
7/18	$1,774,335	$1,235,471
8/18	$1,787,894	$1,209,613
9/18	$1,774,335	$1,215,123
10/18	$1,607,749	$1,116,288
11/18	$1,624,213	$1,126,854
12/18	$1,550,049	$1,075,850
1/19	$1,667,238	$1,157,139
2/19	$1,730,264	$1,179,748
3/19	$1,798,214	$1,186,775
4/19	$1,850,408	$1,218,127
5/19	$1,791,321	$1,152,749
6/19	$1,873,058	$1,222,161
7/19	$1,836,621	$1,207,368
8/19	$1,847,453	$1,170,080
9/19	$1,861,240	$1,200,190
10/19	$1,919,342	$1,242,068
11/19	$1,990,247	$1,253,017
12/19	$2,016,528	$1,307,279
1/20	$1,986,945	$1,272,161
2/20	$1,892,282	$1,171,603
3/20	$1,733,523	$1,001,963
4/20	$1,865,658	$1,077,893
5/20	$1,952,433	$1,113,169
6/20	$2,069,776	$1,163,473
7/20	$2,185,147	$1,215,346
8/20	$2,321,225	$1,267,371
9/20	$2,364,613	$1,236,216
10/20	$2,325,170	$1,209,639
11/20	$2,506,608	$1,372,354
12/20	$2,668,473	$1,446,530
1/21	$2,627,040	$1,449,674
2/21	$2,727,663	$1,478,372
3/21	$2,694,122	$1,497,064
4/21	$2,857,880	$1,541,133
5/21	$2,944,692	$1,589,339
6/21	$2,928,908	$1,579,042
7/21	$2,996,976	$1,553,019
8/21	$3,057,153	$1,582,539
9/21	$2,889,448	$1,531,866
10/21	$3,049,261	$1,568,432
11/21	$3,017,693	$1,497,808
12/21	$3,019,648	$1,559,707
1/22	$2,671,840	$1,502,232
2/22	$2,473,520	$1,472,496
3/22	$2,439,636	$1,474,843
4/22	$2,184,511	$1,382,234
5/22	$2,131,692	$1,392,155
6/22	$1,934,368	$1,272,392
7/22	$2,123,719	$1,315,951
8/22	$1,948,321	$1,273,626
9/22	$1,697,182	$1,146,353
10/22	$1,762,956	$1,180,607
11/22	$2,060,935	$1,319,975
12/22	$1,979,194	$1,310,105
1/23	$2,246,906	$1,416,365
2/23	$2,171,905	$1,366,648
3/23	$2,331,282	$1,400,057
4/23	$2,337,532	$1,424,380
5/23	$2,292,740	$1,372,592
6/23	$2,404,200	$1,434,179
7/23	$2,404,200	$1,492,488
8/23	$2,243,781	$1,425,079
9/23	$2,057,320	$1,380,069
10/23	$1,950,027	$1,323,129
11/23	$2,181,280	$1,442,230
12/23	$2,342,912	$1,514,690
1/24	$2,357,503	$1,499,645
2/24	$2,479,443	$1,537,611
3/24	$2,495,076	$1,585,677
4/24	$2,325,194	$1,557,203
5/24	$2,421,078	$1,602,406
6/24	$2,403,361	$1,600,882
7/24	$2,428,374	$1,637,950
8/24	$2,546,145	$1,684,598
9/24	$2,637,860	$1,729,960
10/24	$2,508,625	$1,645,080
11/24	$2,541,976	$1,630,189
12/24	$2,505,650	$1,598,514

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class I	6.95%	4.44%	9.62%
MSCI All Country World ex USA Net Index	5.53%	4.10%	4.80%

AssetsNet

$ 2,744,697,984

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 23,306,085

InvestmentCompanyPortfolioTurnover

26.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,744,697,984
# of Portfolio Holdings	34
Portfolio Turnover Rate	26%
Total Advisory Fees Paid	$23,306,085

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	15.6%
Netherlands	5.4%
Italy	5.4%
Taiwan	5.5%
Switzerland	5.7%
Sweden	6.1%
United States	7.8%
India	8.2%
Denmark	8.3%
Canada	10.6%
France	21.4%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Hermes International SCA	8.8%
DSV AS	8.3%
Spotify Technology SA	6.1%
Taiwan Semiconductor Manufacturing Co. Ltd.	5.5%
Moncler SpA	5.4%
Schneider Electric SE	5.2%
MercadoLibre, Inc.	4.4%
Keyence Corp.	4.1%
L'Oreal SA	3.8%
ASML Holding NV	3.8%
Total	55.4%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000094899

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Advantage Portfolio

Class Name

Class L

Trading Symbol

MSALX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - International Advantage Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$191	1.85%

Expenses Paid, Amount

$ 191

Expense Ratio, Percent

1.85%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World ex USA Net Index:

↑ Stock selection in communication services, led by a Swedish audio streaming platform, which was the largest positive contributor in the portfolio

↑ Stock selection in information technology, led by a holding in a Taiwanese semiconductor foundry service provider

↑ No exposure to materials

↓ Stock selection in consumer discretionary, where exposure to an Italian luxury brand was the main detractor

↓ Stock selection in financials, where a position in a Pan-Asian life insurance group was the main detractor

↓ Stock selection in health care, where a provider of products and solutions in the aesthetic dentistry market was the largest detractor across the portfolio

Line Graph [Table Text Block]

	Class L	MSCI All Country World ex USA Net Index
12/14	$10,000	$10,000
1/15	$10,276	$9,985
2/15	$10,804	$10,519
3/15	$10,658	$10,349
4/15	$11,210	$10,872
5/15	$11,243	$10,702
6/15	$11,194	$10,403
7/15	$11,223	$10,375
8/15	$10,569	$9,582
9/15	$10,403	$9,137
10/15	$11,281	$9,818
11/15	$11,232	$9,615
12/15	$10,934	$9,434
1/16	$10,504	$8,792
2/16	$10,224	$8,692
3/16	$10,766	$9,398
4/16	$10,831	$9,646
5/16	$10,924	$9,483
6/16	$10,896	$9,338
7/16	$11,559	$9,800
8/16	$11,373	$9,862
9/16	$11,625	$9,983
10/16	$11,494	$9,840
11/16	$11,120	$9,612
12/16	$11,113	$9,858
1/17	$11,692	$10,207
2/17	$12,091	$10,370
3/17	$12,718	$10,633
4/17	$13,297	$10,860
5/17	$14,057	$11,213
6/17	$14,076	$11,248
7/17	$14,758	$11,662
8/17	$15,167	$11,723
9/17	$15,300	$11,941
10/17	$15,414	$12,165
11/17	$15,528	$12,264
12/17	$15,937	$12,538
1/18	$16,781	$13,237
2/18	$16,228	$12,613
3/18	$16,703	$12,390
4/18	$16,936	$12,588
5/18	$17,557	$12,297
6/18	$17,266	$12,066
7/18	$17,217	$12,355
8/18	$17,333	$12,096
9/18	$17,198	$12,151
10/18	$15,567	$11,163
11/18	$15,713	$11,269
12/18	$14,989	$10,758
1/19	$16,114	$11,571
2/19	$16,707	$11,797
3/19	$17,349	$11,868
4/19	$17,842	$12,181
5/19	$17,260	$11,527
6/19	$18,030	$12,222
7/19	$17,675	$12,074
8/19	$17,763	$11,701
9/19	$17,882	$12,002
10/19	$18,425	$12,421
11/19	$19,096	$12,530
12/19	$19,337	$13,073
1/20	$19,031	$12,722
2/20	$18,111	$11,716
3/20	$16,579	$10,020
4/20	$17,835	$10,779
5/20	$18,655	$11,132
6/20	$19,753	$11,635
7/20	$20,840	$12,153
8/20	$22,125	$12,674
9/20	$22,531	$12,362
10/20	$22,135	$12,096
11/20	$23,845	$13,724
12/20	$25,360	$14,465
1/21	$24,954	$14,497
2/21	$25,884	$14,784
3/21	$25,547	$14,971
4/21	$27,090	$15,411
5/21	$27,891	$15,893
6/21	$27,723	$15,790
7/21	$28,337	$15,530
8/21	$28,890	$15,825
9/21	$27,288	$15,319
10/21	$28,772	$15,684
11/21	$28,455	$14,978
12/21	$28,455	$15,597
1/22	$25,156	$15,022
2/22	$23,276	$14,725
3/22	$22,936	$14,748
4/22	$20,526	$13,822
5/22	$20,017	$13,922
6/22	$18,147	$12,724
7/22	$19,917	$13,160
8/22	$18,257	$12,736
9/22	$15,887	$11,464
10/22	$16,497	$11,806
11/22	$19,277	$13,200
12/22	$18,497	$13,101
1/23	$20,971	$14,164
2/23	$20,269	$13,666
3/23	$21,737	$14,001
4/23	$21,779	$14,244
5/23	$21,349	$13,726
6/23	$22,366	$14,342
7/23	$22,345	$14,925
8/23	$20,845	$14,251
9/23	$19,094	$13,801
10/23	$18,088	$13,231
11/23	$20,216	$14,422
12/23	$21,705	$15,147
1/24	$21,821	$14,996
2/24	$22,932	$15,376
3/24	$23,068	$15,857
4/24	$21,475	$15,572
5/24	$22,345	$16,024
6/24	$22,167	$16,009
7/24	$22,376	$16,379
8/24	$23,446	$16,846
9/24	$24,274	$17,300
10/24	$23,079	$16,451
11/24	$23,362	$16,302
12/24	$23,005	$15,985

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class L	5.99%	3.53%	8.69%
MSCI All Country World ex USA Net Index	5.53%	4.10%	4.80%

AssetsNet

$ 2,744,697,984

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 23,306,085

InvestmentCompanyPortfolioTurnover

26.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,744,697,984
# of Portfolio Holdings	34
Portfolio Turnover Rate	26%
Total Advisory Fees Paid	$23,306,085

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	15.6%
Netherlands	5.4%
Italy	5.4%
Taiwan	5.5%
Switzerland	5.7%
Sweden	6.1%
United States	7.8%
India	8.2%
Denmark	8.3%
Canada	10.6%
France	21.4%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Hermes International SCA	8.8%
DSV AS	8.3%
Spotify Technology SA	6.1%
Taiwan Semiconductor Manufacturing Co. Ltd.	5.5%
Moncler SpA	5.4%
Schneider Electric SE	5.2%
MercadoLibre, Inc.	4.4%
Keyence Corp.	4.1%
L'Oreal SA	3.8%
ASML Holding NV	3.8%
Total	55.4%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000198826

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Advantage Portfolio

Class Name

Class R6

Trading Symbol

IDVSX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - International Advantage Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$92	0.89%

Expenses Paid, Amount

$ 92

Expense Ratio, Percent

0.89%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World ex USA Net Index:

↑ Stock selection in communication services, led by a Swedish audio streaming platform, which was the largest positive contributor in the portfolio

↑ Stock selection in information technology, led by a holding in a Taiwanese semiconductor foundry service provider

↑ No exposure to materials

↓ Stock selection in consumer discretionary, where exposure to an Italian luxury brand was the main detractor

↓ Stock selection in financials, where a position in a Pan-Asian life insurance group was the main detractor

↓ Stock selection in health care, where a provider of products and solutions in the aesthetic dentistry market was the largest detractor across the portfolio

Line Graph [Table Text Block]

	Class R6	MSCI All Country World ex USA Net Index
6/18	$5,000,000	$5,000,000
6/18	$4,859,788	$5,000,000
7/18	$4,849,092	$5,003,075
8/18	$4,886,148	$4,898,360
9/18	$4,851,739	$4,920,675
10/18	$4,396,475	$4,520,439
11/18	$4,438,825	$4,563,225
12/18	$4,238,831	$4,356,683
1/19	$4,559,098	$4,685,865
2/19	$4,731,342	$4,777,423
3/19	$4,914,352	$4,805,878
4/19	$5,059,684	$4,932,838
5/19	$4,898,204	$4,668,088
6/19	$5,121,584	$4,949,176
7/19	$5,022,005	$4,889,271
8/19	$5,051,610	$4,738,270
9/19	$5,089,288	$4,860,204
10/19	$5,248,076	$5,029,789
11/19	$5,444,542	$5,074,127
12/19	$5,516,587	$5,293,864
1/20	$5,435,699	$5,151,653
2/20	$5,176,856	$4,744,440
3/20	$4,742,755	$4,057,478
4/20	$5,106,753	$4,364,957
5/20	$5,344,025	$4,507,810
6/20	$5,664,882	$4,711,518
7/20	$5,980,347	$4,921,577
8/20	$6,355,130	$5,132,254
9/20	$6,473,766	$5,006,091
10/20	$6,365,915	$4,898,467
11/20	$6,864,727	$5,557,384
12/20	$7,307,323	$5,857,764
1/21	$7,196,728	$5,870,495
2/21	$7,469,168	$5,986,709
3/21	$7,380,153	$6,062,403
4/21	$7,827,925	$6,240,860
5/21	$8,067,996	$6,436,073
6/21	$8,024,837	$6,394,373
7/21	$8,210,960	$6,288,993
8/21	$8,378,200	$6,408,536
9/21	$7,919,638	$6,203,332
10/21	$8,356,621	$6,351,407
11/21	$8,270,303	$6,065,416
12/21	$8,278,366	$6,316,078
1/22	$7,324,637	$6,083,330
2/22	$6,782,374	$5,962,915
3/22	$6,689,727	$5,972,419
4/22	$5,989,417	$5,597,393
5/22	$5,847,720	$5,637,572
6/22	$5,305,457	$5,152,587
7/22	$5,825,921	$5,328,978
8/22	$5,346,331	$5,157,585
9/22	$4,656,922	$4,642,187
10/22	$4,836,768	$4,780,901
11/22	$5,656,974	$5,345,275
12/22	$5,430,753	$5,305,306
1/23	$6,165,485	$5,735,610
2/23	$5,960,443	$5,534,280
3/23	$6,399,004	$5,669,569
4/23	$6,416,091	$5,768,066
5/23	$6,296,483	$5,558,350
6/23	$6,601,198	$5,807,749
7/23	$6,601,198	$6,043,871
8/23	$6,162,637	$5,770,896
9/23	$5,650,033	$5,588,627
10/23	$5,356,710	$5,358,046
11/23	$5,991,769	$5,840,350
12/23	$6,437,751	$6,133,780
1/24	$6,477,684	$6,072,853
2/24	$6,814,261	$6,226,600
3/24	$6,857,046	$6,421,243
4/24	$6,389,261	$6,305,935
5/24	$6,651,677	$6,488,988
6/24	$6,606,039	$6,482,817
7/24	$6,674,496	$6,632,924
8/24	$6,999,663	$6,821,825
9/24	$7,250,670	$7,005,520
10/24	$6,896,979	$6,661,795
11/24	$6,988,254	$6,601,494
12/24	$6,890,668	$6,473,226

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 6/15/18 (Inception)
Class R6	7.04%	4.55%	5.02%
MSCI All Country World ex USA Net Index	5.53%	4.10%	4.02%

Performance Inception Date

Jun. 15, 2018

AssetsNet

$ 2,744,697,984

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 23,306,085

InvestmentCompanyPortfolioTurnover

26.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,744,697,984
# of Portfolio Holdings	34
Portfolio Turnover Rate	26%
Total Advisory Fees Paid	$23,306,085

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	15.6%
Netherlands	5.4%
Italy	5.4%
Taiwan	5.5%
Switzerland	5.7%
Sweden	6.1%
United States	7.8%
India	8.2%
Denmark	8.3%
Canada	10.6%
France	21.4%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Hermes International SCA	8.8%
DSV AS	8.3%
Spotify Technology SA	6.1%
Taiwan Semiconductor Manufacturing Co. Ltd.	5.5%
Moncler SpA	5.4%
Schneider Electric SE	5.2%
MercadoLibre, Inc.	4.4%
Keyence Corp.	4.1%
L'Oreal SA	3.8%
ASML Holding NV	3.8%
Total	55.4%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000007759

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Equity Portfolio

Class Name

Class A

Trading Symbol

MIQBX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - International Equity Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$132	1.30%

Expenses Paid, Amount

$ 132

Expense Ratio, Percent

1.30%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI EAFE Index:

↓ Sector allocation overall was marginally negative, driven by the overweight in consumer staples and underweight in financials

↓ Stock selection in industrials, consumer staples and financials

↑ Stock selection overall was marginally positive, helped by strength in materials and information technology

↑ Underweights in materials and health care and overweight in information technology

Line Graph [Table Text Block]

	Class A with maximum sales charge	MSCI EAFE Index
12/14	$9,473	$10,000
1/15	$9,684	$10,049
2/15	$10,205	$10,650
3/15	$9,938	$10,488
4/15	$10,403	$10,916
5/15	$10,484	$10,860
6/15	$10,136	$10,552
7/15	$10,311	$10,772
8/15	$9,567	$9,979
9/15	$9,205	$9,472
10/15	$9,786	$10,213
11/15	$9,667	$10,054
12/15	$9,471	$9,919
1/16	$9,096	$9,201
2/16	$8,715	$9,033
3/16	$9,230	$9,620
4/16	$9,395	$9,899
5/16	$9,490	$9,809
6/16	$9,261	$9,480
7/16	$9,557	$9,960
8/16	$9,513	$9,967
9/16	$9,481	$10,090
10/16	$9,151	$9,883
11/16	$8,934	$9,687
12/16	$9,250	$10,018
1/17	$9,493	$10,308
2/17	$9,730	$10,456
3/17	$10,018	$10,744
4/17	$10,306	$11,017
5/17	$10,901	$11,421
6/17	$10,773	$11,401
7/17	$10,922	$11,730
8/17	$10,986	$11,726
9/17	$11,128	$12,017
10/17	$11,244	$12,200
11/17	$11,430	$12,328
12/17	$11,542	$12,526
1/18	$11,958	$13,154
2/18	$11,197	$12,560
3/18	$11,353	$12,334
4/18	$11,535	$12,615
5/18	$11,392	$12,332
6/18	$11,327	$12,181
7/18	$11,442	$12,481
8/18	$11,266	$12,240
9/18	$11,357	$12,346
10/18	$10,420	$11,364
11/18	$10,472	$11,349
12/18	$9,911	$10,798
1/19	$10,443	$11,508
2/19	$10,782	$11,801
3/19	$11,011	$11,876
4/19	$11,270	$12,210
5/19	$10,613	$11,623
6/19	$11,285	$12,313
7/19	$10,982	$12,157
8/19	$10,893	$11,842
9/19	$11,085	$12,181
10/19	$11,403	$12,619
11/19	$11,558	$12,761
12/19	$11,904	$13,176
1/20	$11,661	$12,900
2/20	$10,833	$11,734
3/20	$9,462	$10,168
4/20	$10,314	$10,825
5/20	$10,711	$11,296
6/20	$11,190	$11,681
7/20	$11,401	$11,953
8/20	$11,783	$12,568
9/20	$11,572	$12,241
10/20	$10,858	$11,752
11/20	$12,456	$13,574
12/20	$13,214	$14,205
1/21	$12,862	$14,054
2/21	$12,903	$14,369
3/21	$13,288	$14,700
4/21	$13,787	$15,142
5/21	$14,417	$15,636
6/21	$14,147	$15,460
7/21	$13,991	$15,576
8/21	$14,073	$15,851
9/21	$13,443	$15,391
10/21	$13,828	$15,769
11/21	$13,099	$15,035
12/21	$13,752	$15,805
1/22	$13,516	$15,042
2/22	$13,136	$14,776
3/22	$12,846	$14,871
4/22	$12,129	$13,909
5/22	$12,220	$14,013
6/22	$11,350	$12,713
7/22	$11,794	$13,346
8/22	$10,987	$12,712
9/22	$9,972	$11,523
10/22	$10,507	$12,143
11/22	$11,948	$13,510
12/22	$11,776	$13,521
1/23	$12,916	$14,616
2/23	$12,536	$14,311
3/23	$13,053	$14,666
4/23	$13,491	$15,080
5/23	$12,945	$14,442
6/23	$13,472	$15,099
7/23	$13,647	$15,587
8/23	$13,053	$14,990
9/23	$12,390	$14,478
10/23	$11,961	$13,891
11/23	$13,053	$15,181
12/23	$13,704	$15,987
1/24	$13,495	$16,079
2/24	$13,814	$16,373
3/24	$14,024	$16,912
4/24	$13,844	$16,479
5/24	$14,434	$17,117
6/24	$14,224	$16,841
7/24	$14,623	$17,335
8/24	$15,083	$17,899
9/24	$15,423	$18,064
10/24	$14,434	$17,082
11/24	$14,254	$16,985
12/24	$14,047	$16,598

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class A	2.50%	3.37%	4.02%
Class A, with 5.25% maximum front end sales charge	(2.88)%	2.26%	3.46%
MSCI EAFE Index	3.82%	4.73%	5.20%

AssetsNet

$ 641,571,525

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 8,526,859

InvestmentCompanyPortfolioTurnover

49.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$641,571,525
# of Portfolio Holdings	58
Portfolio Turnover Rate	49%
Total Advisory Fees Paid	$8,526,859

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	13.9%
Denmark	3.5%
Netherlands	4.1%
Finland	4.4%
Sweden	4.6%
Canada	4.8%
China	5.1%
Japan	5.3%
Germany	12.8%
France	17.6%
United Kingdom	23.9%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

SAP SE	4.1%
L'Oreal SA	3.4%
Halma PLC	2.8%
Qiagen NV	2.6%
Capgemini SE	2.6%
Infineon Technologies AG	2.3%
AIA Group Ltd.	2.3%
Tencent Holdings Ltd.	2.3%
Kone OYJ	2.2%
AstraZeneca PLC	2.2%
Total	26.8%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155894

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Equity Portfolio

Class Name

Class C

Trading Symbol

MSECX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - International Equity Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$207	2.05%

Expenses Paid, Amount

$ 207

Expense Ratio, Percent

2.05%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI EAFE Index:

↓ Sector allocation overall was marginally negative, driven by the overweight in consumer staples and underweight in financials

↓ Stock selection in industrials, consumer staples and financials

↑ Stock selection overall was marginally positive, helped by strength in materials and information technology

↑ Underweights in materials and health care and overweight in information technology

Line Graph [Table Text Block]

	Class C	MSCI EAFE Index
4/15	$10,000	$10,000
5/15	$10,066	$9,949
6/15	$9,737	$9,667
7/15	$9,900	$9,868
8/15	$9,175	$9,142
9/15	$8,818	$8,678
10/15	$9,374	$9,356
11/15	$9,259	$9,210
12/15	$9,059	$9,086
1/16	$8,691	$8,429
2/16	$8,323	$8,275
3/16	$8,814	$8,813
4/16	$8,967	$9,068
5/16	$9,053	$8,986
6/16	$8,826	$8,684
7/16	$9,099	$9,124
8/16	$9,050	$9,131
9/16	$9,020	$9,243
10/16	$8,700	$9,054
11/16	$8,485	$8,874
12/16	$8,786	$9,177
1/17	$9,007	$9,443
2/17	$9,222	$9,578
3/17	$9,499	$9,842
4/17	$9,763	$10,092
5/17	$10,315	$10,463
6/17	$10,192	$10,444
7/17	$10,323	$10,746
8/17	$10,379	$10,742
9/17	$10,508	$11,009
10/17	$10,607	$11,176
11/17	$10,780	$11,293
12/17	$10,876	$11,475
1/18	$11,261	$12,050
2/18	$10,540	$11,506
3/18	$10,683	$11,299
4/18	$10,845	$11,557
5/18	$10,702	$11,297
6/18	$10,633	$11,159
7/18	$10,731	$11,434
8/18	$10,563	$11,213
9/18	$10,637	$11,310
10/18	$9,754	$10,410
11/18	$9,797	$10,397
12/18	$9,264	$9,892
1/19	$9,753	$10,542
2/19	$10,065	$10,811
3/19	$10,277	$10,879
4/19	$10,511	$11,185
5/19	$9,895	$10,648
6/19	$10,511	$11,280
7/19	$10,228	$11,136
8/19	$10,135	$10,848
9/19	$10,298	$11,159
10/19	$10,596	$11,560
11/19	$10,723	$11,690
12/19	$11,041	$12,070
1/20	$10,809	$11,818
2/20	$10,035	$10,749
3/20	$8,757	$9,315
4/20	$9,539	$9,917
5/20	$9,895	$10,348
6/20	$10,337	$10,701
7/20	$10,523	$10,950
8/20	$10,863	$11,513
9/20	$10,670	$11,214
10/20	$10,004	$10,766
11/20	$11,475	$12,435
12/20	$12,164	$13,013
1/21	$11,830	$12,875
2/21	$11,861	$13,163
3/21	$12,203	$13,466
4/21	$12,654	$13,871
5/21	$13,222	$14,324
6/21	$12,957	$14,162
7/21	$12,802	$14,269
8/21	$12,864	$14,521
9/21	$12,281	$14,099
10/21	$12,623	$14,446
11/21	$11,946	$13,774
12/21	$12,531	$14,479
1/22	$12,308	$13,779
2/22	$11,949	$13,536
3/22	$11,683	$13,623
4/22	$11,024	$12,741
5/22	$11,101	$12,837
6/22	$10,296	$11,646
7/22	$10,698	$12,226
8/22	$9,962	$11,645
9/22	$9,036	$10,556
10/22	$9,508	$11,124
11/22	$10,801	$12,377
12/22	$10,637	$12,387
1/23	$11,670	$13,390
2/23	$11,313	$13,110
3/23	$11,780	$13,435
4/23	$12,164	$13,814
5/23	$11,672	$13,230
6/23	$12,146	$13,832
7/23	$12,305	$14,279
8/23	$11,769	$13,732
9/23	$11,171	$13,263
10/23	$10,784	$12,726
11/23	$11,769	$13,907
12/23	$12,356	$14,646
1/24	$12,167	$14,730
2/24	$12,455	$14,999
3/24	$12,645	$15,493
4/24	$12,482	$15,096
5/24	$13,014	$15,681
6/24	$12,825	$15,428
7/24	$13,185	$15,880
8/24	$13,599	$16,397
9/24	$13,905	$16,548
10/24	$13,014	$15,648
11/24	$12,852	$15,559
12/24	$12,665	$15,205

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 4/30/15 (Inception)
Class C, with conversion to Class A after 8 years	1.69%	2.51%	2.47%
Class C, with 1% maximum contingent deferred sales charge and conversion to Class A after 8 years	0.96%	2.51%	2.47%
MSCI EAFE Index	3.82%	4.73%	4.43%

Performance Inception Date

Apr. 30, 2015

AssetsNet

$ 641,571,525

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 8,526,859

InvestmentCompanyPortfolioTurnover

49.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$641,571,525
# of Portfolio Holdings	58
Portfolio Turnover Rate	49%
Total Advisory Fees Paid	$8,526,859

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	13.9%
Denmark	3.5%
Netherlands	4.1%
Finland	4.4%
Sweden	4.6%
Canada	4.8%
China	5.1%
Japan	5.3%
Germany	12.8%
France	17.6%
United Kingdom	23.9%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

SAP SE	4.1%
L'Oreal SA	3.4%
Halma PLC	2.8%
Qiagen NV	2.6%
Capgemini SE	2.6%
Infineon Technologies AG	2.3%
AIA Group Ltd.	2.3%
Tencent Holdings Ltd.	2.3%
Kone OYJ	2.2%
AstraZeneca PLC	2.2%
Total	26.8%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000007758

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Equity Portfolio

Class Name

Class I

Trading Symbol

MSIQX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - International Equity Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$96	0.95%

Expenses Paid, Amount

$ 96

Expense Ratio, Percent

0.95%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI EAFE Index:

↓ Sector allocation overall was marginally negative, driven by the overweight in consumer staples and underweight in financials

↓ Stock selection in industrials, consumer staples and financials

↑ Stock selection overall was marginally positive, helped by strength in materials and information technology

↑ Underweights in materials and health care and overweight in information technology

Line Graph [Table Text Block]

	Class I	MSCI EAFE Index
12/14	$1,000,000	$1,000,000
1/15	$1,022,624	$1,004,888
2/15	$1,077,569	$1,064,962
3/15	$1,049,774	$1,048,784
4/15	$1,099,548	$1,091,604
5/15	$1,107,951	$1,086,017
6/15	$1,072,398	$1,055,246
7/15	$1,090,648	$1,077,156
8/15	$1,012,419	$997,918
9/15	$973,956	$947,248
10/15	$1,035,888	$1,021,293
11/15	$1,024,153	$1,005,405
12/15	$1,003,558	$991,858
1/16	$963,681	$920,133
2/16	$923,805	$903,276
3/16	$978,303	$962,050
4/16	$996,912	$989,902
5/16	$1,006,881	$980,909
6/16	$982,955	$947,983
7/16	$1,014,601	$996,027
8/16	$1,009,944	$996,734
9/16	$1,007,283	$1,008,979
10/16	$972,021	$988,340
11/16	$949,400	$968,656
12/16	$983,513	$1,001,779
1/17	$1,009,713	$1,030,838
2/17	$1,034,570	$1,045,579
3/17	$1,066,144	$1,074,362
4/17	$1,097,047	$1,101,699
5/17	$1,160,868	$1,142,136
6/17	$1,147,432	$1,140,116
7/17	$1,163,058	$1,173,004
8/17	$1,170,496	$1,172,562
9/17	$1,186,049	$1,201,736
10/17	$1,198,896	$1,219,984
11/17	$1,219,182	$1,232,780
12/17	$1,231,017	$1,252,568
1/18	$1,276,229	$1,315,396
2/18	$1,195,395	$1,256,024
3/18	$1,212,521	$1,233,386
4/18	$1,232,387	$1,261,548
5/18	$1,217,316	$1,233,191
6/18	$1,210,465	$1,218,124
7/18	$1,223,241	$1,248,109
8/18	$1,204,718	$1,224,005
9/18	$1,214,323	$1,234,628
10/18	$1,114,844	$1,136,361
11/18	$1,120,333	$1,134,929
12/18	$1,061,112	$1,079,835
1/19	$1,117,747	$1,150,802
2/19	$1,154,716	$1,180,138
3/19	$1,179,887	$1,187,580
4/19	$1,207,418	$1,220,969
5/19	$1,137,411	$1,162,331
6/19	$1,209,778	$1,231,286
7/19	$1,178,314	$1,215,653
8/19	$1,168,875	$1,184,160
9/19	$1,189,326	$1,218,094
10/19	$1,223,936	$1,261,859
11/19	$1,240,455	$1,276,084
12/19	$1,277,288	$1,317,556
1/20	$1,252,158	$1,290,035
2/20	$1,163,770	$1,173,419
3/20	$1,016,458	$1,016,805
4/20	$1,107,445	$1,082,493
5/20	$1,150,772	$1,129,630
6/20	$1,202,765	$1,168,094
7/20	$1,226,162	$1,195,321
8/20	$1,266,889	$1,256,773
9/20	$1,245,226	$1,224,118
10/20	$1,168,970	$1,175,240
11/20	$1,341,412	$1,357,418
12/20	$1,423,146	$1,420,533
1/21	$1,385,371	$1,405,399
2/21	$1,390,642	$1,436,921
3/21	$1,431,931	$1,469,960
4/21	$1,486,397	$1,514,190
5/21	$1,554,918	$1,563,570
6/21	$1,525,050	$1,545,974
7/21	$1,508,359	$1,557,614
8/21	$1,517,144	$1,585,089
9/21	$1,449,500	$1,539,088
10/21	$1,490,789	$1,576,943
11/21	$1,412,604	$1,503,546
12/21	$1,482,728	$1,580,533
1/22	$1,457,399	$1,504,156
2/22	$1,416,483	$1,477,560
3/22	$1,386,282	$1,487,057
4/22	$1,309,321	$1,390,852
5/22	$1,319,063	$1,401,279
6/22	$1,225,540	$1,271,258
7/22	$1,274,250	$1,334,605
8/22	$1,187,546	$1,271,218
9/22	$1,077,462	$1,152,300
10/22	$1,134,940	$1,214,264
11/22	$1,290,811	$1,351,034
12/22	$1,272,472	$1,352,119
1/23	$1,397,203	$1,461,610
2/23	$1,356,325	$1,431,111
3/23	$1,412,926	$1,466,580
4/23	$1,460,093	$1,507,986
5/23	$1,401,396	$1,444,171
6/23	$1,459,045	$1,509,894
7/23	$1,478,960	$1,558,749
8/23	$1,415,022	$1,499,030
9/23	$1,342,699	$1,447,826
10/23	$1,296,580	$1,389,129
11/23	$1,416,070	$1,518,065
12/23	$1,487,584	$1,598,718
1/24	$1,465,675	$1,607,919
2/24	$1,499,633	$1,637,351
3/24	$1,523,733	$1,691,202
4/24	$1,504,015	$1,647,893
5/24	$1,568,645	$1,711,724
6/24	$1,546,737	$1,684,090
7/24	$1,590,553	$1,733,495
8/24	$1,640,943	$1,789,862
9/24	$1,678,187	$1,806,390
10/24	$1,571,931	$1,708,157
11/24	$1,552,214	$1,698,466
12/24	$1,529,390	$1,659,840

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class I	2.81%	3.67%	4.34%
MSCI EAFE Index	3.82%	4.73%	5.20%

AssetsNet

$ 641,571,525

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 8,526,859

InvestmentCompanyPortfolioTurnover

49.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$641,571,525
# of Portfolio Holdings	58
Portfolio Turnover Rate	49%
Total Advisory Fees Paid	$8,526,859

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	13.9%
Denmark	3.5%
Netherlands	4.1%
Finland	4.4%
Sweden	4.6%
Canada	4.8%
China	5.1%
Japan	5.3%
Germany	12.8%
France	17.6%
United Kingdom	23.9%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

SAP SE	4.1%
L'Oreal SA	3.4%
Halma PLC	2.8%
Qiagen NV	2.6%
Capgemini SE	2.6%
Infineon Technologies AG	2.3%
AIA Group Ltd.	2.3%
Tencent Holdings Ltd.	2.3%
Kone OYJ	2.2%
AstraZeneca PLC	2.2%
Total	26.8%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000113811

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Equity Portfolio

Class Name

Class L

Trading Symbol

MSQLX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - International Equity Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$182	1.80%

Expenses Paid, Amount

$ 182

Expense Ratio, Percent

1.80%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI EAFE Index:

↓ Sector allocation overall was marginally negative, driven by the overweight in consumer staples and underweight in financials

↓ Stock selection in industrials, consumer staples and financials

↑ Stock selection overall was marginally positive, helped by strength in materials and information technology

↑ Underweights in materials and health care and overweight in information technology

Line Graph [Table Text Block]

	Class L	MSCI EAFE Index
12/14	$10,000	$10,000
1/15	$10,217	$10,049
2/15	$10,762	$10,650
3/15	$10,479	$10,488
4/15	$10,965	$10,916
5/15	$11,044	$10,860
6/15	$10,676	$10,552
7/15	$10,855	$10,772
8/15	$10,067	$9,979
9/15	$9,683	$9,472
10/15	$10,292	$10,213
11/15	$10,160	$10,054
12/15	$9,953	$9,919
1/16	$9,551	$9,201
2/16	$9,143	$9,033
3/16	$9,685	$9,620
4/16	$9,859	$9,899
5/16	$9,946	$9,809
6/16	$9,705	$9,480
7/16	$10,010	$9,960
8/16	$9,957	$9,967
9/16	$9,923	$10,090
10/16	$9,575	$9,883
11/16	$9,340	$9,687
12/16	$9,672	$10,018
1/17	$9,920	$10,308
2/17	$10,161	$10,456
3/17	$10,463	$10,744
4/17	$10,758	$11,017
5/17	$11,368	$11,421
6/17	$11,234	$11,401
7/17	$11,376	$11,730
8/17	$11,443	$11,726
9/17	$11,585	$12,017
10/17	$11,707	$12,200
11/17	$11,896	$12,328
12/17	$11,999	$12,526
1/18	$12,432	$13,154
2/18	$11,639	$12,560
3/18	$11,795	$12,334
4/18	$11,978	$12,615
5/18	$11,822	$12,332
6/18	$11,748	$12,181
7/18	$11,861	$12,481
8/18	$11,677	$12,240
9/18	$11,766	$12,346
10/18	$10,795	$11,364
11/18	$10,842	$11,349
12/18	$10,260	$10,798
1/19	$10,809	$11,508
2/19	$11,149	$11,801
3/19	$11,388	$11,876
4/19	$11,651	$12,210
5/19	$10,971	$11,623
6/19	$11,651	$12,313
7/19	$11,342	$12,157
8/19	$11,241	$11,842
9/19	$11,427	$12,181
10/19	$11,759	$12,619
11/19	$11,906	$12,761
12/19	$12,259	$13,176
1/20	$12,005	$12,900
2/20	$11,143	$11,734
3/20	$9,731	$10,168
4/20	$10,593	$10,825
5/20	$10,999	$11,296
6/20	$11,489	$11,681
7/20	$11,701	$11,953
8/20	$12,081	$12,568
9/20	$11,870	$12,241
10/20	$11,134	$11,752
11/20	$12,766	$13,574
12/20	$13,533	$14,205
1/21	$13,167	$14,054
2/21	$13,210	$14,369
3/21	$13,592	$14,700
4/21	$14,094	$15,142
5/21	$14,732	$15,636
6/21	$14,443	$15,460
7/21	$14,273	$15,576
8/21	$14,350	$15,851
9/21	$13,695	$15,391
10/21	$14,086	$15,769
11/21	$13,329	$15,035
12/21	$13,985	$15,805
1/22	$13,742	$15,042
2/22	$13,339	$14,776
3/22	$13,039	$14,871
4/22	$12,318	$13,909
5/22	$12,402	$14,013
6/22	$11,503	$12,713
7/22	$11,962	$13,346
8/22	$11,128	$12,712
9/22	$10,098	$11,523
10/22	$10,632	$12,143
11/22	$12,084	$13,510
12/22	$11,907	$13,521
1/23	$13,057	$14,616
2/23	$12,667	$14,311
3/23	$13,187	$14,666
4/23	$13,617	$15,080
5/23	$13,067	$14,442
6/23	$13,587	$15,099
7/23	$13,767	$15,587
8/23	$13,157	$14,990
9/23	$12,477	$14,478
10/23	$12,047	$13,891
11/23	$13,137	$15,181
12/23	$13,789	$15,987
1/24	$13,572	$16,079
2/24	$13,883	$16,373
3/24	$14,100	$16,912
4/24	$13,914	$16,479
5/24	$14,484	$17,117
6/24	$14,277	$16,841
7/24	$14,671	$17,335
8/24	$15,127	$17,899
9/24	$15,459	$18,064
10/24	$14,474	$17,082
11/24	$14,277	$16,985
12/24	$14,054	$16,598

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class L	1.92%	2.77%	3.46%
MSCI EAFE Index	3.82%	4.73%	5.20%

AssetsNet

$ 641,571,525

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 8,526,859

InvestmentCompanyPortfolioTurnover

49.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$641,571,525
# of Portfolio Holdings	58
Portfolio Turnover Rate	49%
Total Advisory Fees Paid	$8,526,859

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	13.9%
Denmark	3.5%
Netherlands	4.1%
Finland	4.4%
Sweden	4.6%
Canada	4.8%
China	5.1%
Japan	5.3%
Germany	12.8%
France	17.6%
United Kingdom	23.9%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

SAP SE	4.1%
L'Oreal SA	3.4%
Halma PLC	2.8%
Qiagen NV	2.6%
Capgemini SE	2.6%
Infineon Technologies AG	2.3%
AIA Group Ltd.	2.3%
Tencent Holdings Ltd.	2.3%
Kone OYJ	2.2%
AstraZeneca PLC	2.2%
Total	26.8%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000126915

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Equity Portfolio

Class Name

Class R6

Trading Symbol

MIQPX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - International Equity Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$92	0.91%

Expenses Paid, Amount

$ 92

Expense Ratio, Percent

0.91%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI EAFE Index:

↓ Sector allocation overall was marginally negative, driven by the overweight in consumer staples and underweight in financials

↓ Stock selection in industrials, consumer staples and financials

↑ Stock selection overall was marginally positive, helped by strength in materials and information technology

↑ Underweights in materials and health care and overweight in information technology

Line Graph [Table Text Block]

	Class R6	MSCI EAFE Index
12/14	$5,000,000	$5,000,000
1/15	$5,113,122	$5,024,442
2/15	$5,391,080	$5,324,808
3/15	$5,252,101	$5,243,918
4/15	$5,500,970	$5,458,022
5/15	$5,542,986	$5,430,084
6/15	$5,365,223	$5,276,231
7/15	$5,456,474	$5,385,782
8/15	$5,065,329	$4,989,588
9/15	$4,873,016	$4,736,239
10/15	$5,182,672	$5,106,467
11/15	$5,124,000	$5,027,027
12/15	$5,020,086	$4,959,292
1/16	$4,820,613	$4,600,666
2/16	$4,621,139	$4,516,379
3/16	$4,893,753	$4,810,248
4/16	$4,986,841	$4,949,510
5/16	$5,036,709	$4,904,547
6/16	$4,917,025	$4,739,914
7/16	$5,075,328	$4,980,136
8/16	$5,052,032	$4,983,672
9/16	$5,038,719	$5,044,893
10/16	$4,865,659	$4,941,701
11/16	$4,752,504	$4,843,282
12/16	$4,922,012	$5,008,895
1/17	$5,053,131	$5,154,191
2/17	$5,177,526	$5,227,894
3/17	$5,335,542	$5,371,811
4/17	$5,490,195	$5,508,496
5/17	$5,809,588	$5,710,680
6/17	$5,742,347	$5,700,581
7/17	$5,820,548	$5,865,018
8/17	$5,857,772	$5,862,808
9/17	$5,938,989	$6,008,678
10/17	$6,003,286	$6,099,918
11/17	$6,101,423	$6,163,902
12/17	$6,163,201	$6,262,839
1/18	$6,389,563	$6,576,980
2/18	$5,984,856	$6,280,122
3/18	$6,070,599	$6,166,931
4/18	$6,170,061	$6,307,738
5/18	$6,094,607	$6,165,953
6/18	$6,060,310	$6,090,622
7/18	$6,124,274	$6,240,544
8/18	$6,031,534	$6,120,024
9/18	$6,083,056	$6,173,138
10/18	$5,581,573	$5,681,806
11/18	$5,612,486	$5,674,646
12/18	$5,314,992	$5,399,177
1/19	$5,598,669	$5,754,012
2/19	$5,783,846	$5,900,689
3/19	$5,909,925	$5,937,898
4/19	$6,047,823	$6,104,844
5/19	$5,701,107	$5,811,653
6/19	$6,059,643	$6,156,432
7/19	$5,902,045	$6,078,265
8/19	$5,854,765	$5,920,802
9/19	$5,957,204	$6,090,468
10/19	$6,130,562	$6,309,293
11/19	$6,213,301	$6,380,419
12/19	$6,400,447	$6,587,781
1/20	$6,274,522	$6,450,177
2/20	$5,831,615	$5,867,096
3/20	$5,093,436	$5,084,024
4/20	$5,553,712	$5,412,466
5/20	$5,766,481	$5,648,151
6/20	$6,027,015	$5,840,468
7/20	$6,144,255	$5,976,603
8/20	$6,348,340	$6,283,866
9/20	$6,239,784	$6,120,590
10/20	$5,857,668	$5,876,202
11/20	$6,721,772	$6,787,092
12/20	$7,129,556	$7,102,664
1/21	$6,944,602	$7,026,993
2/21	$6,966,620	$7,184,604
3/21	$7,173,593	$7,349,801
4/21	$7,446,621	$7,570,952
5/21	$7,790,108	$7,817,849
6/21	$7,640,383	$7,729,868
7/21	$7,556,713	$7,788,070
8/21	$7,605,154	$7,925,446
9/21	$7,261,667	$7,695,442
10/21	$7,473,043	$7,884,715
11/21	$7,076,712	$7,517,731
12/21	$7,431,543	$7,902,667
1/22	$7,309,394	$7,520,779
2/22	$7,099,297	$7,387,801
3/22	$6,947,833	$7,435,286
4/22	$6,566,728	$6,954,262
5/22	$6,615,587	$7,006,397
6/22	$6,141,650	$6,356,290
7/22	$6,385,947	$6,673,024
8/22	$5,951,097	$6,356,091
9/22	$5,403,870	$5,761,498
10/22	$5,692,141	$6,071,320
11/22	$6,473,895	$6,755,169
12/22	$6,380,787	$6,760,597
1/23	$7,006,767	$7,308,050
2/23	$6,801,614	$7,155,556
3/23	$7,085,672	$7,332,900
4/23	$7,322,387	$7,539,929
5/23	$7,027,808	$7,220,854
6/23	$7,317,127	$7,549,472
7/23	$7,417,073	$7,793,747
8/23	$7,096,193	$7,495,149
9/23	$6,738,490	$7,239,132
10/23	$6,507,035	$6,945,645
11/23	$7,101,453	$7,590,324
12/23	$7,463,081	$7,993,591
1/24	$7,353,088	$8,039,593
2/24	$7,523,578	$8,186,753
3/24	$7,644,571	$8,456,012
4/24	$7,545,577	$8,239,464
5/24	$7,864,559	$8,558,619
6/24	$7,760,065	$8,420,451
7/24	$7,980,052	$8,667,477
8/24	$8,233,038	$8,949,311
9/24	$8,420,028	$9,031,952
10/24	$7,886,558	$8,540,786
11/24	$7,782,064	$8,492,330
12/24	$7,672,675	$8,299,199

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class R6	2.81%	3.69%	4.38%
MSCI EAFE Index	3.82%	4.73%	5.20%

AssetsNet

$ 641,571,525

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 8,526,859

InvestmentCompanyPortfolioTurnover

49.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$641,571,525
# of Portfolio Holdings	58
Portfolio Turnover Rate	49%
Total Advisory Fees Paid	$8,526,859

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	13.9%
Denmark	3.5%
Netherlands	4.1%
Finland	4.4%
Sweden	4.6%
Canada	4.8%
China	5.1%
Japan	5.3%
Germany	12.8%
France	17.6%
United Kingdom	23.9%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

SAP SE	4.1%
L'Oreal SA	3.4%
Halma PLC	2.8%
Qiagen NV	2.6%
Capgemini SE	2.6%
Infineon Technologies AG	2.3%
AIA Group Ltd.	2.3%
Tencent Holdings Ltd.	2.3%
Kone OYJ	2.2%
AstraZeneca PLC	2.2%
Total	26.8%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000085089

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Opportunity Portfolio

Class Name

Class A

Trading Symbol

MIOPX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - International Opportunity Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$144	1.32%

Expenses Paid, Amount

$ 144

Expense Ratio, Percent

1.32%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World ex USA Net Index:

↑ Stock selection in consumer discretionary, led by a position in a Chinese online travel agency

↑ Stock selection in communication services, led by a Swedish audio streaming platform, which was the largest positive contributor in the portfolio

↑ No exposure to materials

↓ Stock selection in financials, where a South Korean digital bank was the largest detractor across the portfolio

↓ An average overweight in consumer discretionary, where exposure to an online casino solutions company was the main detractor

↓ Stock selection in consumer staples, where a holding in a leading beauty company was the main detractor

Line Graph [Table Text Block]

	Class A with maximum sales charge	MSCI All Country World ex USA Net Index
12/14	$9,474	$10,000
1/15	$9,686	$9,985
2/15	$10,123	$10,519
3/15	$10,150	$10,349
4/15	$10,656	$10,872
5/15	$10,670	$10,702
6/15	$10,704	$10,403
7/15	$10,574	$10,375
8/15	$9,857	$9,582
9/15	$9,732	$9,137
10/15	$10,679	$9,818
11/15	$10,693	$9,615
12/15	$10,515	$9,434
1/16	$9,973	$8,792
2/16	$9,515	$8,692
3/16	$10,142	$9,398
4/16	$10,247	$9,646
5/16	$10,346	$9,483
6/16	$10,261	$9,338
7/16	$10,888	$9,800
8/16	$10,825	$9,862
9/16	$11,064	$9,983
10/16	$10,874	$9,840
11/16	$10,522	$9,612
12/16	$10,409	$9,858
1/17	$10,965	$10,207
2/17	$11,402	$10,370
3/17	$12,105	$10,633
4/17	$12,690	$10,860
5/17	$13,429	$11,213
6/17	$13,520	$11,248
7/17	$14,522	$11,662
8/17	$14,832	$11,723
9/17	$15,093	$11,941
10/17	$15,326	$12,165
11/17	$15,213	$12,264
12/17	$15,927	$12,538
1/18	$17,058	$13,237
2/18	$16,529	$12,613
3/18	$16,650	$12,390
4/18	$16,793	$12,588
5/18	$17,688	$12,297
6/18	$17,266	$12,066
7/18	$16,940	$12,355
8/18	$16,768	$12,096
9/18	$16,446	$12,151
10/18	$14,473	$11,163
11/18	$14,667	$11,269
12/18	$13,958	$10,758
1/19	$15,357	$11,571
2/19	$16,160	$11,797
3/19	$17,071	$11,868
4/19	$17,466	$12,181
5/19	$16,440	$11,527
6/19	$17,430	$12,222
7/19	$17,193	$12,074
8/19	$16,971	$11,701
9/19	$16,842	$12,002
10/19	$17,559	$12,421
11/19	$18,283	$12,530
12/19	$18,814	$13,073
1/20	$18,176	$12,722
2/20	$17,602	$11,716
3/20	$15,981	$10,020
4/20	$17,882	$10,779
5/20	$19,280	$11,132
6/20	$21,404	$11,635
7/20	$23,125	$12,153
8/20	$24,818	$12,674
9/20	$24,890	$12,362
10/20	$24,882	$12,096
11/20	$27,242	$13,724
12/20	$29,173	$14,465
1/21	$29,662	$14,497
2/21	$31,186	$14,784
3/21	$29,187	$14,971
4/21	$30,388	$15,411
5/21	$30,244	$15,893
6/21	$30,726	$15,790
7/21	$29,245	$15,530
8/21	$30,187	$15,825
9/21	$27,979	$15,319
10/21	$29,568	$15,684
11/21	$28,274	$14,978
12/21	$27,567	$15,597
1/22	$23,766	$15,022
2/22	$21,721	$14,725
3/22	$20,288	$14,748
4/22	$17,412	$13,822
5/22	$16,809	$13,922
6/22	$15,030	$12,724
7/22	$16,611	$13,160
8/22	$15,706	$12,736
9/22	$13,846	$11,464
10/22	$14,170	$11,806
11/22	$16,287	$13,200
12/22	$15,449	$13,101
1/23	$17,623	$14,164
2/23	$16,826	$13,666
3/23	$18,042	$14,001
4/23	$17,977	$14,244
5/23	$17,816	$13,726
6/23	$18,653	$14,342
7/23	$19,241	$14,925
8/23	$18,098	$14,251
9/23	$16,842	$13,801
10/23	$15,932	$13,231
11/23	$17,816	$14,422
12/23	$18,653	$15,147
1/24	$18,331	$14,996
2/24	$19,780	$15,376
3/24	$20,102	$15,857
4/24	$19,531	$15,572
5/24	$20,263	$16,024
6/24	$20,223	$16,009
7/24	$20,263	$16,379
8/24	$21,471	$16,846
9/24	$22,824	$17,300
10/24	$22,477	$16,451
11/24	$22,912	$16,302
12/24	$22,180	$15,985

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class A	18.90%	3.35%	8.88%
Class A, with 5.25% maximum front end sales charge	12.68%	2.24%	8.29%
MSCI All Country World ex USA Net Index	5.53%	4.10%	4.80%

AssetsNet

$ 723,453,302

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 6,950,818

InvestmentCompanyPortfolioTurnover

28.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$723,453,302
# of Portfolio Holdings	34
Portfolio Turnover Rate	28%
Total Advisory Fees Paid	$6,950,818

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	18.8%
Canada	4.4%
Sweden	4.8%
Brazil	5.1%
Japan	5.8%
Denmark	6.5%
Korea, Republic of	6.5%
United States	9.8%
France	12.0%
China	13.1%
India	13.2%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

DSV AS	6.5%
MercadoLibre, Inc.	5.6%
Spotify Technology SA	4.8%
Hermes International SCA	4.3%
Trip.com Group Ltd.	4.3%
Coupang, Inc.	4.3%
ICICI Bank Ltd.	4.2%
Taiwan Semiconductor Manufacturing Co. Ltd.	4.1%
Schneider Electric SE	4.0%
Meituan	4.0%
Total	46.1%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155897

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Opportunity Portfolio

Class Name

Class C

Trading Symbol

MSOCX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$225	2.06%

Expenses Paid, Amount

$ 225

Expense Ratio, Percent

2.06%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World ex USA Net Index:

↑ Stock selection in consumer discretionary, led by a position in a Chinese online travel agency

↑ Stock selection in communication services, led by a Swedish audio streaming platform, which was the largest positive contributor in the portfolio

↑ No exposure to materials

↓ Stock selection in financials, where a South Korean digital bank was the largest detractor across the portfolio

↓ An average overweight in consumer discretionary, where exposure to an online casino solutions company was the main detractor

↓ Stock selection in consumer staples, where a holding in a leading beauty company was the main detractor

Line Graph [Table Text Block]

	Class C	MSCI All Country World ex USA Net Index
4/15	$10,000	$10,000
5/15	$10,006	$9,844
6/15	$10,032	$9,569
7/15	$9,898	$9,543
8/15	$9,222	$8,813
9/15	$9,103	$8,405
10/15	$9,984	$9,030
11/15	$9,991	$8,844
12/15	$9,815	$8,677
1/16	$9,299	$8,087
2/16	$8,870	$7,995
3/16	$9,446	$8,645
4/16	$9,540	$8,872
5/16	$9,620	$8,722
6/16	$9,533	$8,589
7/16	$10,117	$9,014
8/16	$10,050	$9,071
9/16	$10,271	$9,183
10/16	$10,083	$9,051
11/16	$9,755	$8,841
12/16	$9,647	$9,067
1/17	$10,150	$9,389
2/17	$10,546	$9,538
3/17	$11,189	$9,780
4/17	$11,719	$9,989
5/17	$12,396	$10,314
6/17	$12,476	$10,346
7/17	$13,391	$10,727
8/17	$13,666	$10,783
9/17	$13,901	$10,983
10/17	$14,102	$11,190
11/17	$13,995	$11,281
12/17	$14,642	$11,533
1/18	$15,672	$12,175
2/18	$15,181	$11,601
3/18	$15,283	$11,397
4/18	$15,399	$11,578
5/18	$16,211	$11,311
6/18	$15,815	$11,099
7/18	$15,505	$11,364
8/18	$15,341	$11,126
9/18	$15,040	$11,177
10/18	$13,222	$10,268
11/18	$13,393	$10,365
12/18	$12,738	$9,896
1/19	$14,009	$10,643
2/19	$14,734	$10,851
3/19	$15,555	$10,916
4/19	$15,910	$11,204
5/19	$14,967	$10,603
6/19	$15,856	$11,242
7/19	$15,630	$11,105
8/19	$15,411	$10,763
9/19	$15,295	$11,039
10/19	$15,931	$11,425
11/19	$16,580	$11,525
12/19	$17,052	$12,024
1/20	$16,464	$11,701
2/20	$15,938	$10,777
3/20	$14,454	$9,216
4/20	$16,170	$9,915
5/20	$17,421	$10,239
6/20	$19,322	$10,702
7/20	$20,867	$11,179
8/20	$22,378	$11,657
9/20	$22,433	$11,371
10/20	$22,412	$11,126
11/20	$24,525	$12,623
12/20	$26,249	$13,305
1/21	$26,667	$13,334
2/21	$28,025	$13,598
3/21	$26,215	$13,770
4/21	$27,271	$14,176
5/21	$27,127	$14,619
6/21	$27,545	$14,524
7/21	$26,201	$14,285
8/21	$27,031	$14,556
9/21	$25,043	$14,090
10/21	$26,441	$14,427
11/21	$25,269	$13,777
12/21	$24,629	$14,346
1/22	$21,217	$13,818
2/22	$19,392	$13,544
3/22	$18,100	$13,566
4/22	$15,523	$12,714
5/22	$14,983	$12,805
6/22	$13,382	$11,704
7/22	$14,779	$12,104
8/22	$13,965	$11,715
9/22	$12,301	$10,544
10/22	$12,581	$10,859
11/22	$14,456	$12,141
12/22	$13,704	$12,050
1/23	$15,624	$13,028
2/23	$14,904	$12,571
3/23	$15,973	$12,878
4/23	$15,911	$13,102
5/23	$15,768	$12,625
6/23	$16,509	$13,192
7/23	$17,030	$13,728
8/23	$16,018	$13,108
9/23	$14,906	$12,694
10/23	$14,101	$12,170
11/23	$15,768	$13,266
12/23	$16,509	$13,932
1/24	$16,224	$13,794
2/24	$17,507	$14,143
3/24	$17,792	$14,585
4/24	$17,286	$14,323
5/24	$17,934	$14,739
6/24	$17,899	$14,725
7/24	$17,934	$15,066
8/24	$19,003	$15,495
9/24	$20,200	$15,912
10/24	$19,894	$15,132
11/24	$20,279	$14,995
12/24	$19,630	$14,703

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 4/30/15 (Inception)
Class C, with conversion to Class A after 8 years	18.06%	2.60%	7.22%
Class C, with 1% maximum contingent deferred sales charge and conversion to Class A after 8 years	17.06%	2.60%	7.22%
MSCI All Country World ex USA Net Index	5.53%	4.10%	4.07%

Performance Inception Date

Apr. 30, 2015

AssetsNet

$ 723,453,302

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 6,950,818

InvestmentCompanyPortfolioTurnover

28.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$723,453,302
# of Portfolio Holdings	34
Portfolio Turnover Rate	28%
Total Advisory Fees Paid	$6,950,818

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	18.8%
Canada	4.4%
Sweden	4.8%
Brazil	5.1%
Japan	5.8%
Denmark	6.5%
Korea, Republic of	6.5%
United States	9.8%
France	12.0%
China	13.1%
India	13.2%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

DSV AS	6.5%
MercadoLibre, Inc.	5.6%
Spotify Technology SA	4.8%
Hermes International SCA	4.3%
Trip.com Group Ltd.	4.3%
Coupang, Inc.	4.3%
ICICI Bank Ltd.	4.2%
Taiwan Semiconductor Manufacturing Co. Ltd.	4.1%
Schneider Electric SE	4.0%
Meituan	4.0%
Total	46.1%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000085087

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Opportunity Portfolio

Class Name

Class I

Trading Symbol

MIOIX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$110	1.00%

Expenses Paid, Amount

$ 110

Expense Ratio, Percent

1.00%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World ex USA Net Index:

↑ Stock selection in consumer discretionary, led by a position in a Chinese online travel agency

↑ Stock selection in communication services, led by a Swedish audio streaming platform, which was the largest positive contributor in the portfolio

↑ No exposure to materials

↓ Stock selection in financials, where a South Korean digital bank was the largest detractor across the portfolio

↓ An average overweight in consumer discretionary, where exposure to an online casino solutions company was the main detractor

↓ Stock selection in consumer staples, where a holding in a leading beauty company was the main detractor

Line Graph [Table Text Block]

	Class I	MSCI All Country World ex USA Net Index
12/14	$1,000,000	$1,000,000
1/15	$1,023,005	$998,518
2/15	$1,069,015	$1,051,901
3/15	$1,072,610	$1,034,899
4/15	$1,126,528	$1,087,181
5/15	$1,128,684	$1,070,204
6/15	$1,132,279	$1,040,349
7/15	$1,118,779	$1,037,456
8/15	$1,043,265	$958,158
9/15	$1,030,068	$913,734
10/15	$1,131,242	$981,755
11/15	$1,132,709	$961,488
12/15	$1,113,965	$943,379
1/16	$1,056,895	$879,207
2/16	$1,008,720	$869,158
3/16	$1,075,424	$939,829
4/16	$1,087,283	$964,565
5/16	$1,097,659	$948,283
6/16	$1,088,765	$933,775
7/16	$1,155,667	$979,953
8/16	$1,149,737	$986,151
9/16	$1,175,682	$998,311
10/16	$1,155,667	$983,958
11/16	$1,118,603	$961,199
12/16	$1,106,742	$985,785
1/17	$1,166,045	$1,020,706
2/17	$1,212,747	$1,036,982
3/17	$1,288,358	$1,063,271
4/17	$1,349,885	$1,086,034
5/17	$1,429,203	$1,121,275
6/17	$1,439,581	$1,124,757
7/17	$1,545,856	$1,166,213
8/17	$1,579,267	$1,172,315
9/17	$1,607,482	$1,194,078
10/17	$1,632,726	$1,216,542
11/17	$1,621,589	$1,226,424
12/17	$1,697,561	$1,253,836
1/18	$1,818,923	$1,323,670
2/18	$1,763,142	$1,261,255
3/18	$1,776,710	$1,239,011
4/18	$1,791,786	$1,258,792
5/18	$1,887,519	$1,229,727
6/18	$1,843,045	$1,206,613
7/18	$1,808,780	$1,235,471
8/18	$1,790,654	$1,209,613
9/18	$1,757,424	$1,215,123
10/18	$1,546,714	$1,116,288
11/18	$1,567,861	$1,126,854
12/18	$1,493,236	$1,075,850
1/19	$1,642,786	$1,157,139
2/19	$1,728,890	$1,179,748
3/19	$1,827,080	$1,186,775
4/19	$1,870,132	$1,218,127
5/19	$1,761,368	$1,152,749
6/19	$1,867,111	$1,222,162
7/19	$1,842,186	$1,207,368
8/19	$1,818,771	$1,170,080
9/19	$1,805,931	$1,200,191
10/19	$1,882,972	$1,242,068
11/19	$1,961,524	$1,253,017
12/19	$2,018,927	$1,307,279
1/20	$1,950,950	$1,272,162
2/20	$1,889,770	$1,171,604
3/20	$1,716,050	$1,001,963
4/20	$1,920,737	$1,077,893
5/20	$2,071,043	$1,113,169
6/20	$2,299,900	$1,163,474
7/20	$2,484,949	$1,215,346
8/20	$2,667,733	$1,267,371
9/20	$2,676,041	$1,236,216
10/20	$2,676,041	$1,209,639
11/20	$2,930,579	$1,372,354
12/20	$3,139,172	$1,446,530
1/21	$3,192,173	$1,449,674
2/21	$3,356,476	$1,478,372
3/21	$3,142,201	$1,497,064
4/21	$3,272,431	$1,541,133
5/21	$3,258,045	$1,589,339
6/21	$3,310,289	$1,579,042
7/21	$3,151,286	$1,553,019
8/21	$3,254,260	$1,582,539
9/21	$3,016,512	$1,531,866
10/21	$3,188,387	$1,568,432
11/21	$3,049,827	$1,497,808
12/21	$2,974,665	$1,559,708
1/22	$2,565,301	$1,502,232
2/22	$2,345,528	$1,472,497
3/22	$2,191,533	$1,474,844
4/22	$1,880,447	$1,382,234
5/22	$1,816,991	$1,392,156
6/22	$1,624,303	$1,272,392
7/22	$1,795,324	$1,315,951
8/22	$1,698,593	$1,273,626
9/22	$1,497,393	$1,146,353
10/22	$1,532,990	$1,180,607
11/22	$1,762,822	$1,319,975
12/22	$1,673,087	$1,310,105
1/23	$1,908,840	$1,416,365
2/23	$1,822,651	$1,366,648
3/23	$1,954,470	$1,400,057
4/23	$1,948,555	$1,424,380
5/23	$1,931,655	$1,372,592
6/23	$2,022,070	$1,434,180
7/23	$2,086,289	$1,492,488
8/23	$1,963,765	$1,425,079
9/23	$1,826,876	$1,380,069
10/23	$1,729,702	$1,323,129
11/23	$1,934,190	$1,442,230
12/23	$2,026,295	$1,514,691
1/24	$1,991,650	$1,499,645
2/24	$2,150,509	$1,537,612
3/24	$2,185,998	$1,585,677
4/24	$2,124,314	$1,557,203
5/24	$2,203,743	$1,602,407
6/24	$2,200,363	$1,600,883
7/24	$2,205,433	$1,637,950
8/24	$2,337,252	$1,684,598
9/24	$2,485,971	$1,729,960
10/24	$2,447,946	$1,645,080
11/24	$2,496,111	$1,630,189
12/24	$2,417,743	$1,598,514

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class I	19.32%	3.67%	9.23%
MSCI All Country World ex USA Net Index	5.53%	4.10%	4.80%

AssetsNet

$ 723,453,302

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 6,950,818

InvestmentCompanyPortfolioTurnover

28.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$723,453,302
# of Portfolio Holdings	34
Portfolio Turnover Rate	28%
Total Advisory Fees Paid	$6,950,818

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	18.8%
Canada	4.4%
Sweden	4.8%
Brazil	5.1%
Japan	5.8%
Denmark	6.5%
Korea, Republic of	6.5%
United States	9.8%
France	12.0%
China	13.1%
India	13.2%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

DSV AS	6.5%
MercadoLibre, Inc.	5.6%
Spotify Technology SA	4.8%
Hermes International SCA	4.3%
Trip.com Group Ltd.	4.3%
Coupang, Inc.	4.3%
ICICI Bank Ltd.	4.2%
Taiwan Semiconductor Manufacturing Co. Ltd.	4.1%
Schneider Electric SE	4.0%
Meituan	4.0%
Total	46.1%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000198820

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Opportunity Portfolio

Class Name

Class IR

Trading Symbol

MRNPX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class IR	$103	0.94%

Expenses Paid, Amount

$ 103

Expense Ratio, Percent

0.94%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World ex USA Net Index:

↑ Stock selection in consumer discretionary, led by a position in a Chinese online travel agency

↑ Stock selection in communication services, led by a Swedish audio streaming platform, which was the largest positive contributor in the portfolio

↑ No exposure to materials

↓ Stock selection in financials, where a South Korean digital bank was the largest detractor across the portfolio

↓ An average overweight in consumer discretionary, where exposure to an online casino solutions company was the main detractor

↓ Stock selection in consumer staples, where a holding in a leading beauty company was the main detractor

Line Graph [Table Text Block]

	Class IR	MSCI All Country World ex USA Net Index
6/18	$5,000,000	$5,000,000
6/18	$4,822,625	$5,000,000
7/18	$4,735,013	$5,003,075
8/18	$4,687,623	$4,898,360
9/18	$4,598,768	$4,920,675
10/18	$4,047,863	$4,520,439
11/18	$4,105,126	$4,563,225
12/18	$3,908,042	$4,356,684
1/19	$4,301,018	$4,685,865
2/19	$4,528,115	$4,777,423
3/19	$4,784,834	$4,805,878
4/19	$4,897,395	$4,932,839
5/19	$4,611,055	$4,668,089
6/19	$4,889,496	$4,949,177
7/19	$4,824,329	$4,889,272
8/19	$4,763,111	$4,738,271
9/19	$4,729,540	$4,860,205
10/19	$4,932,940	$5,029,790
11/19	$5,138,315	$5,074,128
12/19	$5,288,396	$5,293,864
1/20	$5,110,668	$5,151,654
2/20	$4,952,688	$4,744,441
3/20	$4,496,519	$4,057,478
4/20	$5,033,653	$4,364,957
5/20	$5,428,604	$4,507,810
6/20	$6,026,955	$4,711,518
7/20	$6,514,720	$4,921,578
8/20	$6,994,585	$5,132,254
9/20	$7,016,308	$5,006,091
10/20	$7,016,308	$4,898,467
11/20	$7,683,775	$5,557,384
12/20	$8,231,120	$5,857,765
1/21	$8,371,671	$5,870,495
2/21	$8,803,220	$5,986,709
3/21	$8,241,018	$6,062,403
4/21	$8,583,486	$6,240,861
5/21	$8,545,874	$6,436,074
6/21	$8,684,445	$6,394,374
7/21	$8,268,732	$6,288,994
8/21	$8,537,956	$6,408,537
9/21	$7,916,366	$6,203,332
10/21	$8,367,711	$6,351,408
11/21	$8,005,447	$6,065,416
12/21	$7,808,958	$6,316,079
1/22	$6,734,720	$6,083,331
2/22	$6,158,152	$5,962,915
3/22	$5,753,543	$5,972,420
4/22	$4,938,255	$5,597,394
5/22	$4,770,343	$5,637,572
6/22	$4,266,604	$5,152,587
7/22	$4,715,720	$5,328,979
8/22	$4,460,817	$5,157,585
9/22	$3,932,802	$4,642,187
10/22	$4,027,885	$4,780,902
11/22	$4,630,752	$5,345,276
12/22	$4,396,173	$5,305,307
1/23	$5,016,627	$5,735,610
2/23	$4,789,201	$5,534,280
3/23	$5,135,860	$5,669,569
4/23	$5,120,404	$5,768,067
5/23	$5,076,244	$5,558,351
6/23	$5,314,710	$5,807,750
7/23	$5,482,520	$6,043,872
8/23	$5,160,148	$5,770,897
9/23	$4,802,449	$5,588,629
10/23	$4,544,110	$5,358,048
11/23	$5,082,868	$5,840,351
12/23	$5,323,542	$6,133,781
1/24	$5,233,013	$6,072,854
2/24	$5,648,121	$6,226,602
3/24	$5,743,066	$6,421,244
4/24	$5,581,881	$6,305,937
5/24	$5,791,643	$6,488,990
6/24	$5,782,811	$6,482,819
7/24	$5,796,059	$6,632,925
8/24	$6,142,718	$6,821,826
9/24	$6,533,538	$7,005,522
10/24	$6,436,385	$6,661,797
11/24	$6,562,243	$6,601,496
12/24	$6,354,800	$6,473,228

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 6/15/18 (Inception)
Class IR	19.37%	3.74%	3.73%
MSCI All Country World ex USA Net Index	5.53%	4.10%	4.02%

Performance Inception Date

Jun. 15, 2018

AssetsNet

$ 723,453,302

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 6,950,818

InvestmentCompanyPortfolioTurnover

28.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$723,453,302
# of Portfolio Holdings	34
Portfolio Turnover Rate	28%
Total Advisory Fees Paid	$6,950,818

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	18.8%
Canada	4.4%
Sweden	4.8%
Brazil	5.1%
Japan	5.8%
Denmark	6.5%
Korea, Republic of	6.5%
United States	9.8%
France	12.0%
China	13.1%
India	13.2%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

DSV AS	6.5%
MercadoLibre, Inc.	5.6%
Spotify Technology SA	4.8%
Hermes International SCA	4.3%
Trip.com Group Ltd.	4.3%
Coupang, Inc.	4.3%
ICICI Bank Ltd.	4.2%
Taiwan Semiconductor Manufacturing Co. Ltd.	4.1%
Schneider Electric SE	4.0%
Meituan	4.0%
Total	46.1%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000085088

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Opportunity Portfolio

Class Name

Class L

Trading Symbol

MIOLX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$202	1.85%

Expenses Paid, Amount

$ 202

Expense Ratio, Percent

1.85%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World ex USA Net Index:

↑ Stock selection in consumer discretionary, led by a position in a Chinese online travel agency

↑ Stock selection in communication services, led by a Swedish audio streaming platform, which was the largest positive contributor in the portfolio

↑ No exposure to materials

↓ Stock selection in financials, where a South Korean digital bank was the largest detractor across the portfolio

↓ An average overweight in consumer discretionary, where exposure to an online casino solutions company was the main detractor

↓ Stock selection in consumer staples, where a holding in a leading beauty company was the main detractor

Line Graph [Table Text Block]

	Class L	MSCI All Country World ex USA Net Index
12/14	$10,000	$10,000
1/15	$10,219	$9,985
2/15	$10,679	$10,519
3/15	$10,701	$10,349
4/15	$11,234	$10,872
5/15	$11,241	$10,702
6/15	$11,270	$10,403
7/15	$11,132	$10,375
8/15	$10,366	$9,582
9/15	$10,233	$9,137
10/15	$11,221	$9,818
11/15	$11,236	$9,615
12/15	$11,038	$9,434
1/16	$10,460	$8,792
2/16	$9,979	$8,692
3/16	$10,633	$9,398
4/16	$10,745	$9,646
5/16	$10,836	$9,483
6/16	$10,738	$9,338
7/16	$11,399	$9,800
8/16	$11,324	$9,862
9/16	$11,572	$9,983
10/16	$11,369	$9,840
11/16	$11,001	$9,612
12/16	$10,873	$9,858
1/17	$11,452	$10,207
2/17	$11,895	$10,370
3/17	$12,631	$10,633
4/17	$13,225	$10,860
5/17	$13,992	$11,213
6/17	$14,082	$11,248
7/17	$15,114	$11,662
8/17	$15,430	$11,723
9/17	$15,693	$11,941
10/17	$15,927	$12,165
11/17	$15,806	$12,264
12/17	$16,539	$12,538
1/18	$17,709	$13,237
2/18	$17,151	$12,613
3/18	$17,265	$12,390
4/18	$17,403	$12,588
5/18	$18,320	$12,297
6/18	$17,877	$12,066
7/18	$17,537	$12,355
8/18	$17,346	$12,096
9/18	$17,008	$12,151
10/18	$14,963	$11,163
11/18	$15,154	$11,269
12/18	$14,420	$10,758
1/19	$15,861	$11,571
2/19	$16,681	$11,797
3/19	$17,615	$11,868
4/19	$18,014	$12,181
5/19	$16,949	$11,527
6/19	$17,960	$12,222
7/19	$17,707	$12,074
8/19	$17,470	$11,701
9/19	$17,332	$12,002
10/19	$18,060	$12,421
11/19	$18,795	$12,530
12/19	$19,332	$13,073
1/20	$18,665	$12,722
2/20	$18,075	$11,716
3/20	$16,397	$10,020
4/20	$18,343	$10,779
5/20	$19,769	$11,132
6/20	$21,929	$11,635
7/20	$23,684	$12,153
8/20	$25,408	$12,674
9/20	$25,462	$12,362
10/20	$25,446	$12,096
11/20	$27,844	$13,724
12/20	$29,800	$14,465
1/21	$30,284	$14,497
2/21	$31,820	$14,784
3/21	$29,769	$14,971
4/21	$30,975	$15,411
5/21	$30,814	$15,893
6/21	$31,290	$15,790
7/21	$29,769	$15,530
8/21	$30,714	$15,825
9/21	$28,455	$15,319
10/21	$30,053	$15,684
11/21	$28,732	$14,978
12/21	$28,000	$15,597
1/22	$24,130	$15,022
2/22	$22,046	$14,725
3/22	$20,583	$14,748
4/22	$17,657	$13,822
5/22	$17,044	$13,922
6/22	$15,227	$12,724
7/22	$16,823	$13,160
8/22	$15,895	$12,736
9/22	$14,008	$11,464
10/22	$14,330	$11,806
11/22	$16,470	$13,200
12/22	$15,612	$13,101
1/23	$17,811	$14,164
2/23	$16,988	$13,666
3/23	$18,209	$14,001
4/23	$18,140	$14,244
5/23	$17,967	$13,726
6/23	$18,798	$14,342
7/23	$19,378	$14,925
8/23	$18,218	$14,251
9/23	$16,945	$13,801
10/23	$16,027	$13,231
11/23	$17,906	$14,422
12/23	$18,738	$15,147
1/24	$18,409	$14,996
2/24	$19,855	$15,376
3/24	$20,175	$15,857
4/24	$19,586	$15,572
5/24	$20,313	$16,024
6/24	$20,270	$16,009
7/24	$20,296	$16,379
8/24	$21,500	$16,846
9/24	$22,842	$17,300
10/24	$22,478	$16,451
11/24	$22,911	$16,302
12/24	$22,166	$15,985

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class L	18.30%	2.77%	8.29%
MSCI All Country World ex USA Net Index	5.53%	4.10%	4.80%

AssetsNet

$ 723,453,302

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 6,950,818

InvestmentCompanyPortfolioTurnover

28.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$723,453,302
# of Portfolio Holdings	34
Portfolio Turnover Rate	28%
Total Advisory Fees Paid	$6,950,818

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	18.8%
Canada	4.4%
Sweden	4.8%
Brazil	5.1%
Japan	5.8%
Denmark	6.5%
Korea, Republic of	6.5%
United States	9.8%
France	12.0%
China	13.1%
India	13.2%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

DSV AS	6.5%
MercadoLibre, Inc.	5.6%
Spotify Technology SA	4.8%
Hermes International SCA	4.3%
Trip.com Group Ltd.	4.3%
Coupang, Inc.	4.3%
ICICI Bank Ltd.	4.2%
Taiwan Semiconductor Manufacturing Co. Ltd.	4.1%
Schneider Electric SE	4.0%
Meituan	4.0%
Total	46.1%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000126918

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Opportunity Portfolio

Class Name

Class R6

Trading Symbol

MNOPX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$103	0.94%

Expenses Paid, Amount

$ 103

Expense Ratio, Percent

0.94%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World ex USA Net Index:

↑ Stock selection in consumer discretionary, led by a position in a Chinese online travel agency

↑ Stock selection in communication services, led by a Swedish audio streaming platform, which was the largest positive contributor in the portfolio

↑ No exposure to materials

↓ Stock selection in financials, where a South Korean digital bank was the largest detractor across the portfolio

↓ An average overweight in consumer discretionary, where exposure to an online casino solutions company was the main detractor

↓ Stock selection in consumer staples, where a holding in a leading beauty company was the main detractor

Line Graph [Table Text Block]

	Class R6	MSCI All Country World ex USA Net Index
12/14	$5,000,000	$5,000,000
1/15	$5,111,351	$4,992,591
2/15	$5,344,828	$5,259,507
3/15	$5,362,787	$5,174,493
4/15	$5,632,184	$5,435,903
5/15	$5,639,368	$5,351,019
6/15	$5,657,328	$5,201,743
7/15	$5,590,412	$5,187,278
8/15	$5,213,078	$4,790,788
9/15	$5,150,799	$4,568,669
10/15	$5,652,691	$4,908,774
11/15	$5,663,681	$4,807,442
12/15	$5,570,019	$4,716,894
1/16	$5,281,148	$4,396,035
2/16	$5,040,423	$4,345,789
3/16	$5,377,439	$4,699,144
4/16	$5,432,991	$4,822,823
5/16	$5,484,839	$4,741,415
6/16	$5,444,101	$4,668,876
7/16	$5,779,127	$4,899,767
8/16	$5,749,491	$4,930,753
9/16	$5,875,446	$4,991,556
10/16	$5,779,127	$4,919,790
11/16	$5,593,899	$4,805,993
12/16	$5,534,626	$4,928,924
1/17	$5,830,991	$5,103,529
2/17	$6,064,379	$5,184,911
3/17	$6,442,245	$5,316,357
4/17	$6,749,725	$5,430,168
5/17	$7,146,113	$5,606,375
6/17	$7,197,977	$5,623,784
7/17	$7,732,788	$5,831,063
8/17	$7,899,763	$5,861,577
9/17	$8,040,764	$5,970,389
10/17	$8,166,922	$6,082,711
11/17	$8,107,554	$6,132,122
12/17	$8,490,929	$6,269,181
1/18	$9,097,424	$6,618,348
2/18	$8,818,662	$6,306,274
3/18	$8,886,469	$6,195,055
4/18	$8,961,810	$6,293,960
5/18	$9,440,226	$6,148,634
6/18	$9,217,970	$6,033,066
7/18	$9,046,726	$6,177,357
8/18	$8,956,146	$6,048,063
9/18	$8,790,081	$6,075,616
10/18	$7,737,083	$5,581,440
11/18	$7,842,761	$5,634,269
12/18	$7,469,829	$5,379,249
1/19	$8,217,190	$5,785,694
2/19	$8,651,262	$5,898,741
3/19	$9,141,954	$5,933,875
4/19	$9,357,103	$6,090,635
5/19	$8,813,568	$5,763,745
6/19	$9,342,005	$6,110,808
7/19	$9,217,445	$6,036,842
8/19	$9,100,434	$5,850,399
9/19	$9,036,266	$6,000,953
10/19	$9,425,045	$6,210,341
11/19	$9,817,598	$6,265,086
12/19	$10,104,463	$6,536,397
1/20	$9,764,754	$6,360,808
2/20	$9,462,790	$5,858,018
3/20	$8,590,870	$5,009,817
4/20	$9,617,547	$5,389,465
5/20	$10,372,456	$5,565,847
6/20	$11,516,144	$5,817,368
7/20	$12,444,682	$6,076,731
8/20	$13,361,897	$6,336,856
9/20	$13,403,418	$6,181,081
10/20	$13,403,418	$6,048,196
11/20	$14,682,989	$6,861,769
12/20	$15,725,409	$7,232,652
1/21	$15,994,058	$7,248,371
2/21	$16,818,923	$7,391,862
3/21	$15,748,112	$7,485,321
4/21	$16,398,923	$7,705,665
5/21	$16,327,031	$7,946,697
6/21	$16,591,896	$7,895,209
7/21	$15,797,301	$7,765,096
8/21	$16,311,896	$7,912,697
9/21	$15,127,571	$7,659,328
10/21	$15,990,274	$7,842,160
11/21	$15,294,058	$7,489,042
12/21	$14,918,408	$7,798,538
1/22	$12,868,963	$7,511,161
2/22	$11,766,904	$7,362,483
3/22	$10,993,528	$7,374,218
4/22	$9,435,177	$6,911,169
5/22	$9,118,094	$6,960,778
6/22	$8,151,375	$6,361,961
7/22	$9,013,688	$6,579,754
8/22	$8,526,462	$6,368,132
9/22	$7,517,207	$5,731,764
10/22	$7,695,083	$5,903,037
11/22	$8,851,279	$6,599,876
12/22	$8,399,031	$6,550,526
1/23	$9,585,025	$7,081,826
2/23	$9,150,302	$6,833,242
3/23	$9,812,939	$7,000,285
4/23	$9,787,615	$7,121,901
5/23	$9,703,203	$6,862,962
6/23	$10,154,809	$7,170,898
7/23	$10,479,796	$7,462,441
8/23	$9,863,586	$7,125,396
9/23	$9,175,625	$6,900,346
10/23	$8,686,034	$6,615,646
11/23	$9,711,644	$7,211,151
12/23	$10,171,691	$7,573,453
1/24	$9,998,646	$7,498,226
2/24	$10,796,343	$7,688,059
3/24	$10,977,830	$7,928,387
4/24	$10,665,504	$7,786,016
5/24	$11,070,683	$8,012,033
6/24	$11,053,801	$8,004,414
7/24	$11,079,124	$8,189,752
8/24	$11,741,762	$8,422,991
9/24	$12,488,811	$8,649,802
10/24	$12,298,883	$8,225,401
11/24	$12,543,679	$8,150,946
12/24	$12,147,163	$7,992,572

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class R6	19.42%	3.75%	9.28%
MSCI All Country World ex USA Net Index	5.53%	4.10%	4.80%

AssetsNet

$ 723,453,302

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 6,950,818

InvestmentCompanyPortfolioTurnover

28.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$723,453,302
# of Portfolio Holdings	34
Portfolio Turnover Rate	28%
Total Advisory Fees Paid	$6,950,818

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	18.8%
Canada	4.4%
Sweden	4.8%
Brazil	5.1%
Japan	5.8%
Denmark	6.5%
Korea, Republic of	6.5%
United States	9.8%
France	12.0%
China	13.1%
India	13.2%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

DSV AS	6.5%
MercadoLibre, Inc.	5.6%
Spotify Technology SA	4.8%
Hermes International SCA	4.3%
Trip.com Group Ltd.	4.3%
Coupang, Inc.	4.3%
ICICI Bank Ltd.	4.2%
Taiwan Semiconductor Manufacturing Co. Ltd.	4.1%
Schneider Electric SE	4.0%
Meituan	4.0%
Total	46.1%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000236930

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - International Resilience Portfolio

Class Name

Class A

Trading Symbol

MSDFX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - International Resilience Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$122	1.20%

Expenses Paid, Amount

$ 122

Expense Ratio, Percent

1.20%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World ex U.S. Net Index:

↓ Stock selection, largely driven by weakness in consumer staples, and to a lesser extent in communication services and industrials

↓The overweight to consumer staples and underweight to financials

↑ Sector allocation overall was positive, driven by the overweight in information technology and zero weights in materials and energy

↑ Stock selection in information technology

Line Graph [Table Text Block]

	Class A with maximum sales charge	MSCI All Country World ex USA Net Index
7/22	$9,479	$10,000
8/22	$8,739	$9,678
9/22	$8,000	$8,711
10/22	$8,284	$8,972
11/22	$9,479	$10,031
12/22	$9,242	$9,956
1/23	$10,123	$10,763
2/23	$9,744	$10,385
3/23	$10,417	$10,639
4/23	$10,701	$10,824
5/23	$10,351	$10,430
6/23	$10,720	$10,898
7/23	$10,777	$11,342
8/23	$10,294	$10,829
9/23	$9,659	$10,487
10/23	$9,232	$10,055
11/23	$10,171	$10,960
12/23	$10,726	$11,510
1/24	$10,755	$11,396
2/24	$11,074	$11,684
3/24	$11,025	$12,050
4/24	$10,717	$11,833
5/24	$11,257	$12,177
6/24	$11,122	$12,165
7/24	$11,286	$12,447
8/24	$11,787	$12,801
9/24	$12,077	$13,146
10/24	$11,324	$12,501
11/24	$11,199	$12,388
12/24	$11,080	$12,147

Average Annual Return [Table Text Block]

AATR	1 Year	Since 7/29/22 (Inception)
Class A	3.30%	6.65%
Class A, with 5.25% maximum front end sales charge	(2.16)%	4.32%
MSCI All Country World ex USA Net Index	5.53%	8.36%

Performance Inception Date

Jul. 29, 2022

AssetsNet

$ 1,891,678

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 0

InvestmentCompanyPortfolioTurnover

48.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$1,891,678
# of Portfolio Holdings	40
Portfolio Turnover Rate	48%
Total Advisory Fees Paid (Net of Waivers)	$0

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	9.1%
Hong Kong	2.6%
Canada	2.6%
Finland	2.6%
Italy	3.5%
Sweden	4.6%
Netherlands	5.8%
United States	12.2%
Germany	16.3%
United Kingdom	19.9%
France	20.8%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

SAP SE	6.4%
L'Oreal SA	4.1%
Visa, Inc.	3.8%
Halma PLC	3.7%
Haleon PLC	3.4%
QIAGEN NV	3.2%
Deutsche Boerse AG	3.2%
Hexagon AB	3.1%
ASML Holding NV	3.1%
Capgemini SE	3.0%
Total	37.0%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000236928

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - International Resilience Portfolio

Class Name

Class C

Trading Symbol

MSDEX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - International Resilience Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$197	1.95%

Expenses Paid, Amount

$ 197

Expense Ratio, Percent

1.95%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World ex U.S. Net Index:

↓ Stock selection, largely driven by weakness in consumer staples, and to a lesser extent in communication services and industrials

↓The overweight to consumer staples and underweight to financials

↑ Sector allocation overall was positive, driven by the overweight in information technology and zero weights in materials and energy

↑ Stock selection in information technology

Line Graph [Table Text Block]

	Class C	MSCI All Country World ex USA Net Index
7/22	$10,000	$10,000
8/22	$9,220	$9,678
9/22	$8,430	$8,711
10/22	$8,720	$8,972
11/22	$9,970	$10,031
12/22	$9,710	$9,956
1/23	$10,640	$10,763
2/23	$10,230	$10,385
3/23	$10,930	$10,639
4/23	$11,230	$10,824
5/23	$10,850	$10,430
6/23	$11,230	$10,898
7/23	$11,280	$11,342
8/23	$10,770	$10,829
9/23	$10,100	$10,487
10/23	$9,640	$10,055
11/23	$10,630	$10,960
12/23	$11,199	$11,510
1/24	$11,219	$11,396
2/24	$11,543	$11,684
3/24	$11,483	$12,050
4/24	$11,158	$11,833
5/24	$11,716	$12,177
6/24	$11,564	$12,165
7/24	$11,726	$12,447
8/24	$12,243	$12,801
9/24	$12,537	$13,146
10/24	$11,746	$12,501
11/24	$11,614	$12,388
12/24	$11,481	$12,147

Average Annual Return [Table Text Block]

AATR	1 Year	Since 7/29/22 (Inception)
Class C	2.52%	5.86%
Class C, with 1% maximum contingent deferred sales charge	1.52%	5.86%
MSCI All Country World ex USA Net Index	5.53%	8.36%

Performance Inception Date

Jul. 29, 2022

AssetsNet

$ 1,891,678

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 0

InvestmentCompanyPortfolioTurnover

48.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$1,891,678
# of Portfolio Holdings	40
Portfolio Turnover Rate	48%
Total Advisory Fees Paid (Net of Waivers)	$0

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	9.1%
Hong Kong	2.6%
Canada	2.6%
Finland	2.6%
Italy	3.5%
Sweden	4.6%
Netherlands	5.8%
United States	12.2%
Germany	16.3%
United Kingdom	19.9%
France	20.8%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

SAP SE	6.4%
L'Oreal SA	4.1%
Visa, Inc.	3.8%
Halma PLC	3.7%
Haleon PLC	3.4%
QIAGEN NV	3.2%
Deutsche Boerse AG	3.2%
Hexagon AB	3.1%
ASML Holding NV	3.1%
Capgemini SE	3.0%
Total	37.0%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000236927

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - International Resilience Portfolio

Class Name

Class I

Trading Symbol

MSDKX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - International Resilience Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$87	0.85%

Expenses Paid, Amount

$ 87

Expense Ratio, Percent

0.85%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World ex U.S. Net Index:

↓ Stock selection, largely driven by weakness in consumer staples, and to a lesser extent in communication services and industrials

↓The overweight to consumer staples and underweight to financials

↑ Sector allocation overall was positive, driven by the overweight in information technology and zero weights in materials and energy

↑ Stock selection in information technology

Line Graph [Table Text Block]

	Class I	MSCI All Country World ex USA Net Index
7/22	$1,000,000	$1,000,000
8/22	$923,000	$1,000,000
9/22	$845,000	$871,121
10/22	$875,000	$897,152
11/22	$1,001,000	$1,003,058
12/22	$976,000	$995,558
1/23	$1,070,000	$1,076,306
2/23	$1,030,000	$1,038,526
3/23	$1,102,000	$1,063,913
4/23	$1,132,000	$1,082,396
5/23	$1,095,000	$1,043,042
6/23	$1,134,000	$1,089,843
7/23	$1,141,000	$1,134,152
8/23	$1,090,000	$1,082,927
9/23	$1,024,000	$1,048,724
10/23	$978,000	$1,005,455
11/23	$1,078,000	$1,095,961
12/23	$1,137,475	$1,151,024
1/24	$1,140,538	$1,139,591
2/24	$1,175,255	$1,168,442
3/24	$1,170,149	$1,204,967
4/24	$1,137,475	$1,183,329
5/24	$1,195,676	$1,217,680
6/24	$1,181,381	$1,216,522
7/24	$1,198,739	$1,244,690
8/24	$1,252,856	$1,280,138
9/24	$1,284,509	$1,314,609
10/24	$1,204,866	$1,250,108
11/24	$1,191,592	$1,238,792
12/24	$1,179,010	$1,214,722

Average Annual Return [Table Text Block]

AATR	1 Year	Since 7/29/22 (Inception)
Class I	3.65%	7.03%
MSCI All Country World ex USA Net Index	5.53%	8.36%

Performance Inception Date

Jul. 29, 2022

AssetsNet

$ 1,891,678

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 0

InvestmentCompanyPortfolioTurnover

48.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$1,891,678
# of Portfolio Holdings	40
Portfolio Turnover Rate	48%
Total Advisory Fees Paid (Net of Waivers)	$0

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	9.1%
Hong Kong	2.6%
Canada	2.6%
Finland	2.6%
Italy	3.5%
Sweden	4.6%
Netherlands	5.8%
United States	12.2%
Germany	16.3%
United Kingdom	19.9%
France	20.8%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

SAP SE	6.4%
L'Oreal SA	4.1%
Visa, Inc.	3.8%
Halma PLC	3.7%
Haleon PLC	3.4%
QIAGEN NV	3.2%
Deutsche Boerse AG	3.2%
Hexagon AB	3.1%
ASML Holding NV	3.1%
Capgemini SE	3.0%
Total	37.0%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000236929

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - International Resilience Portfolio

Class Name

Class R6

Trading Symbol

MSCZX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - International Resilience Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$82	0.80%

Expenses Paid, Amount

$ 82

Expense Ratio, Percent

0.80%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI All Country World ex U.S. Net Index:

↓ Stock selection, largely driven by weakness in consumer staples, and to a lesser extent in communication services and industrials

↓The overweight to consumer staples and underweight to financials

↑ Sector allocation overall was positive, driven by the overweight in information technology and zero weights in materials and energy

↑ Stock selection in information technology

Line Graph [Table Text Block]

	Class R6	MSCI All Country World ex USA Net Index
7/22	$5,000,000	$5,000,000
8/22	$4,615,000	$5,000,000
9/22	$4,225,000	$4,355,607
10/22	$4,375,000	$4,485,758
11/22	$5,005,000	$5,015,291
12/22	$4,880,000	$4,977,789
1/23	$5,350,000	$5,381,528
2/23	$5,150,000	$5,192,628
3/23	$5,510,000	$5,319,565
4/23	$5,660,000	$5,411,981
5/23	$5,475,000	$5,215,212
6/23	$5,675,000	$5,449,215
7/23	$5,705,000	$5,670,760
8/23	$5,455,000	$5,414,637
9/23	$5,120,000	$5,243,621
10/23	$4,895,000	$5,027,275
11/23	$5,395,000	$5,479,803
12/23	$5,690,028	$5,755,119
1/24	$5,705,351	$5,697,953
2/24	$5,879,014	$5,842,209
3/24	$5,853,476	$6,024,836
4/24	$5,690,028	$5,916,647
5/24	$5,981,169	$6,088,399
6/24	$5,914,769	$6,082,609
7/24	$6,001,600	$6,223,449
8/24	$6,267,203	$6,400,688
9/24	$6,430,651	$6,573,044
10/24	$6,032,247	$6,250,539
11/24	$5,965,846	$6,193,960
12/24	$5,905,943	$6,073,610

Average Annual Return [Table Text Block]

AATR	1 Year	Since 7/29/22 (Inception)
Class R6	3.79%	7.11%
MSCI All Country World ex USA Net Index	5.53%	8.36%

Performance Inception Date

Jul. 29, 2022

AssetsNet

$ 1,891,678

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 0

InvestmentCompanyPortfolioTurnover

48.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$1,891,678
# of Portfolio Holdings	40
Portfolio Turnover Rate	48%
Total Advisory Fees Paid (Net of Waivers)	$0

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	9.1%
Hong Kong	2.6%
Canada	2.6%
Finland	2.6%
Italy	3.5%
Sweden	4.6%
Netherlands	5.8%
United States	12.2%
Germany	16.3%
United Kingdom	19.9%
France	20.8%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

SAP SE	6.4%
L'Oreal SA	4.1%
Visa, Inc.	3.8%
Halma PLC	3.7%
Haleon PLC	3.4%
QIAGEN NV	3.2%
Deutsche Boerse AG	3.2%
Hexagon AB	3.1%
ASML Holding NV	3.1%
Capgemini SE	3.0%
Total	37.0%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000200800

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Multi-Asset Real Return Portfolio

Class Name

Class A

Trading Symbol

MRJAX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Multi-Asset Real Return Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$111	1.11%

Expenses Paid, Amount

$ 111

Expense Ratio, Percent

1.11%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the Bloomberg U.S. Treasury Bills 1-3 Month Index:

↓ A long position in GSCI commodities detracted due to weakness in energy prices in the second half of the year

↓ A long position in world energy stocks was negatively impacted by falling energy prices following the peak in April 2024

↓ A long position in world materials stocks was weighed down by weaker industrial production and demand for input goods

↑ A long position in U.S. 10-year Treasury inflation-protected securities (TIPS) contributed as the Federal Reserve cut interests rates in 2024

↑A long position in gold benefited from falling interest rates and heightened geopolitical uncertainty

↑ A long position in Brent oil, held early in the year, contributed as rising geopolitical tensions caused oil prices to peak in April

Line Graph [Table Text Block]

	Class A with maximum sales charge	MSCI World Net Index	Bloomberg U.S. Treasury Bill 1-3 Month Index	MSIF Multi-Asset Real Return Blend Index
6/18	$9,479	$10,000	$10,000	$10,000
6/18	$9,479	$9,795	$10,007	$9,795
7/18	$9,630	$10,101	$10,022	$10,101
8/18	$9,630	$10,226	$10,039	$10,226
9/18	$9,545	$10,283	$10,055	$10,283
10/18	$9,124	$9,528	$10,073	$9,528
11/18	$9,219	$9,636	$10,092	$9,636
12/18	$8,824	$8,903	$10,111	$8,903
1/19	$9,448	$9,596	$10,131	$9,596
2/19	$9,565	$9,885	$10,150	$9,885
3/19	$9,779	$10,014	$10,171	$10,014
4/19	$9,877	$10,370	$10,191	$10,370
5/19	$9,681	$9,771	$10,212	$9,771
6/19	$9,916	$10,415	$10,234	$10,415
7/19	$9,819	$10,467	$10,253	$10,467
8/19	$9,790	$10,253	$10,271	$10,253
9/19	$9,957	$10,471	$10,289	$10,471
10/19	$10,092	$10,737	$10,307	$10,737
11/19	$10,151	$11,036	$10,320	$11,036
12/19	$10,406	$11,367	$10,334	$11,367
1/20	$10,406	$11,298	$10,347	$11,298
2/20	$9,883	$10,343	$10,361	$10,343
3/20	$8,469	$8,974	$10,383	$8,974
4/20	$9,054	$9,954	$10,383	$9,954
5/20	$9,144	$10,435	$10,384	$10,435
6/20	$9,253	$10,711	$10,385	$10,711
7/20	$9,375	$11,224	$10,386	$11,224
8/20	$9,663	$11,974	$10,387	$11,974
9/20	$9,405	$11,560	$10,388	$11,560
10/20	$9,166	$11,206	$10,389	$11,206
11/20	$10,183	$12,639	$10,389	$12,639
12/20	$10,413	$13,175	$10,390	$13,175
1/21	$10,313	$13,044	$10,391	$13,044
2/21	$10,483	$13,378	$10,392	$13,378
3/21	$10,784	$13,823	$10,392	$13,823
4/21	$11,278	$14,466	$10,392	$14,466
5/21	$11,469	$14,675	$10,392	$14,675
6/21	$11,549	$14,893	$10,392	$14,893
7/21	$11,782	$15,160	$10,393	$15,160
8/21	$11,903	$15,537	$10,393	$15,563
9/21	$11,722	$14,892	$10,393	$15,563
10/21	$12,236	$15,736	$10,393	$15,563
11/21	$12,327	$15,391	$10,394	$15,564
12/21	$12,665	$16,049	$10,395	$15,565
1/22	$12,641	$15,200	$10,395	$15,565
2/22	$13,046	$14,815	$10,396	$15,567
3/22	$13,093	$15,222	$10,398	$15,570
4/22	$13,058	$13,957	$10,400	$15,573
5/22	$12,965	$13,968	$10,405	$15,581
6/22	$12,052	$12,758	$10,411	$15,589
7/22	$12,607	$13,771	$10,419	$15,602
8/22	$12,202	$13,195	$10,439	$15,631
9/22	$11,739	$11,969	$10,460	$15,663
10/22	$11,982	$12,828	$10,483	$15,697
11/22	$12,884	$13,720	$10,516	$15,746
12/22	$13,012	$13,137	$10,553	$15,802
1/23	$13,398	$14,067	$10,588	$15,855
2/23	$13,037	$13,729	$10,625	$15,911
3/23	$13,217	$14,153	$10,668	$15,974
4/23	$13,181	$14,401	$10,709	$16,036
5/23	$12,892	$14,257	$10,752	$16,101
6/23	$12,808	$15,119	$10,798	$16,170
7/23	$13,145	$15,627	$10,846	$16,241
8/23	$13,024	$15,254	$10,895	$16,315
9/23	$12,531	$14,596	$10,944	$16,387
10/23	$12,531	$14,173	$10,994	$16,463
11/23	$13,229	$15,501	$11,043	$16,536
12/23	$13,674	$16,262	$11,095	$16,613
1/24	$13,511	$16,457	$11,143	$16,686
2/24	$13,435	$17,155	$11,190	$16,756
3/24	$13,649	$17,706	$11,241	$16,833
4/24	$13,360	$17,049	$11,290	$16,906
5/24	$13,599	$17,810	$11,345	$16,988
6/24	$13,549	$18,172	$11,392	$17,059
7/24	$13,913	$18,493	$11,443	$17,136
8/24	$14,027	$18,981	$11,499	$17,218
9/24	$14,291	$19,329	$11,547	$17,291
10/24	$14,102	$18,946	$11,593	$17,360
11/24	$14,052	$19,815	$11,639	$17,428
12/24	$13,594	$19,374	$11,685	$17,565

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 6/18/18 (Inception)
Class A	(0.59)%	5.49%	5.67%
Class A, with 5.25% maximum front end sales charge	(5.79)%	4.36%	4.81%
MSCI World Net Index	18.67%	11.17%	10.65%
Bloomberg U.S. Treasury Bill 1-3 Month Index	5.32%	2.49%	2.41%
MSIF Multi-Asset Real Return Blend Index	5.32%	9.01%	9.00%

Performance Inception Date

Jun. 18, 2018

AssetsNet

$ 7,415,322

Holdings Count | Holding

216

Advisory Fees Paid, Amount

$ 0

InvestmentCompanyPortfolioTurnover

310.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$7,415,322
# of Portfolio Holdings	216
Portfolio Turnover Rate	310%
Total Advisory Fees Paid (Net of Waivers)	$0

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	1.0%
China	0.3%
South Africa	0.3%
Germany	0.4%
Switzerland	0.6%
Japan	0.7%
France	0.8%
Australia	1.7%
United Kingdom	1.9%
Canada	4.6%
United States	87.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000200801

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Multi-Asset Real Return Portfolio

Class Name

Class C

Trading Symbol

MRJCX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Multi-Asset Real Return Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$184	1.85%

Expenses Paid, Amount

$ 184

Expense Ratio, Percent

1.85%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the Bloomberg U.S. Treasury Bills 1-3 Month Index:

↓ A long position in GSCI commodities detracted due to weakness in energy prices in the second half of the year

↓ A long position in world energy stocks was negatively impacted by falling energy prices following the peak in April 2024

↓ A long position in world materials stocks was weighed down by weaker industrial production and demand for input goods

↑ A long position in U.S. 10-year Treasury inflation-protected securities (TIPS) contributed as the Federal Reserve cut interests rates in 2024

↑A long position in gold benefited from falling interest rates and heightened geopolitical uncertainty

↑ A long position in Brent oil, held early in the year, contributed as rising geopolitical tensions caused oil prices to peak in April

Line Graph [Table Text Block]

	Class C	MSCI World Net Index	Bloomberg U.S. Treasury Bill 1-3 Month Index	MSIF Multi-Asset Real Return Blend Index
6/18	$10,000	$10,000	$10,000	$10,000
6/18	$9,990	$9,795	$10,007	$9,795
7/18	$10,150	$10,101	$10,022	$10,101
8/18	$10,140	$10,226	$10,039	$10,226
9/18	$10,040	$10,283	$10,055	$10,283
10/18	$9,605	$9,528	$10,073	$9,528
11/18	$9,685	$9,636	$10,092	$9,636
12/18	$9,273	$8,903	$10,111	$8,903
1/19	$9,917	$9,596	$10,131	$9,596
2/19	$10,040	$9,885	$10,150	$9,885
3/19	$10,255	$10,014	$10,171	$10,014
4/19	$10,345	$10,370	$10,191	$10,370
5/19	$10,140	$9,771	$10,212	$9,771
6/19	$10,386	$10,415	$10,234	$10,415
7/19	$10,273	$10,467	$10,253	$10,467
8/19	$10,243	$10,253	$10,271	$10,253
9/19	$10,407	$10,471	$10,289	$10,471
10/19	$10,542	$10,737	$10,307	$10,737
11/19	$10,594	$11,036	$10,320	$11,036
12/19	$10,860	$11,367	$10,334	$11,367
1/20	$10,849	$11,298	$10,347	$11,298
2/20	$10,291	$10,343	$10,361	$10,343
3/20	$8,812	$8,974	$10,383	$8,974
4/20	$9,417	$9,954	$10,383	$9,954
5/20	$9,500	$10,435	$10,384	$10,435
6/20	$9,614	$10,711	$10,385	$10,711
7/20	$9,740	$11,224	$10,386	$11,224
8/20	$10,030	$11,974	$10,387	$11,974
9/20	$9,750	$11,560	$10,388	$11,560
10/20	$9,493	$11,206	$10,389	$11,206
11/20	$10,542	$12,639	$10,389	$12,639
12/20	$10,772	$13,175	$10,390	$13,175
1/21	$10,657	$13,044	$10,391	$13,044
2/21	$10,834	$13,378	$10,392	$13,378
3/21	$11,146	$13,823	$10,392	$13,823
4/21	$11,641	$14,466	$10,392	$14,466
5/21	$11,839	$14,675	$10,392	$14,675
6/21	$11,912	$14,893	$10,392	$14,893
7/21	$12,140	$15,160	$10,393	$15,160
8/21	$12,255	$15,537	$10,393	$15,563
9/21	$12,067	$14,892	$10,393	$15,563
10/21	$12,579	$15,736	$10,393	$15,563
11/21	$12,673	$15,391	$10,394	$15,564
12/21	$13,013	$16,049	$10,395	$15,565
1/22	$12,977	$15,200	$10,395	$15,565
2/22	$13,383	$14,815	$10,396	$15,567
3/22	$13,430	$15,222	$10,398	$15,570
4/22	$13,371	$13,957	$10,400	$15,573
5/22	$13,275	$13,968	$10,405	$15,581
6/22	$12,332	$12,758	$10,411	$15,589
7/22	$12,893	$13,771	$10,419	$15,602
8/22	$12,463	$13,195	$10,439	$15,631
9/22	$11,998	$11,969	$10,460	$15,663
10/22	$12,225	$12,828	$10,483	$15,697
11/22	$13,144	$13,720	$10,516	$15,746
12/22	$13,273	$13,137	$10,553	$15,802
1/23	$13,657	$14,067	$10,588	$15,855
2/23	$13,273	$13,729	$10,625	$15,911
3/23	$13,459	$14,153	$10,668	$15,974
4/23	$13,409	$14,401	$10,709	$16,036
5/23	$13,112	$14,257	$10,752	$16,101
6/23	$13,013	$15,119	$10,798	$16,170
7/23	$13,347	$15,627	$10,846	$16,241
8/23	$13,211	$15,254	$10,895	$16,315
9/23	$12,704	$14,596	$10,944	$16,387
10/23	$12,704	$14,173	$10,994	$16,463
11/23	$13,397	$15,501	$11,043	$16,536
12/23	$13,837	$16,262	$11,095	$16,613
1/24	$13,657	$16,457	$11,143	$16,686
2/24	$13,580	$17,155	$11,190	$16,756
3/24	$13,798	$17,706	$11,241	$16,833
4/24	$13,490	$17,049	$11,290	$16,906
5/24	$13,721	$17,810	$11,345	$16,988
6/24	$13,657	$18,172	$11,392	$17,059
7/24	$14,016	$18,493	$11,443	$17,136
8/24	$14,119	$18,981	$11,499	$17,218
9/24	$14,389	$19,329	$11,547	$17,291
10/24	$14,183	$18,946	$11,593	$17,360
11/24	$14,132	$19,815	$11,639	$17,428
12/24	$13,661	$19,374	$11,685	$17,565

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 6/18/18 (Inception)
Class C	(1.27)%	4.70%	4.89%
Class C, with 1% maximum contingent deferred sales charge	(2.17)%	4.70%	4.89%
MSCI World Net Index	18.67%	11.17%	10.65%
Bloomberg U.S. Treasury Bill 1-3 Month Index	5.32%	2.49%	2.41%
MSIF Multi-Asset Real Return Blend Index	5.32%	9.01%	9.00%

Performance Inception Date

Jun. 18, 2018

AssetsNet

$ 7,415,322

Holdings Count | Holding

216

Advisory Fees Paid, Amount

$ 0

InvestmentCompanyPortfolioTurnover

310.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$7,415,322
# of Portfolio Holdings	216
Portfolio Turnover Rate	310%
Total Advisory Fees Paid (Net of Waivers)	$0

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	1.0%
China	0.3%
South Africa	0.3%
Germany	0.4%
Switzerland	0.6%
Japan	0.7%
France	0.8%
Australia	1.7%
United Kingdom	1.9%
Canada	4.6%
United States	87.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000200799

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Multi-Asset Real Return Portfolio

Class Name

Class I

Trading Symbol

MRJIX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Multi-Asset Real Return Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$75	0.75%

Expenses Paid, Amount

$ 75

Expense Ratio, Percent

0.75%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the Bloomberg U.S. Treasury Bills 1-3 Month Index:

↓ A long position in GSCI commodities detracted due to weakness in energy prices in the second half of the year

↓ A long position in world energy stocks was negatively impacted by falling energy prices following the peak in April 2024

↓ A long position in world materials stocks was weighed down by weaker industrial production and demand for input goods

↑ A long position in U.S. 10-year Treasury inflation-protected securities (TIPS) contributed as the Federal Reserve cut interests rates in 2024

↑A long position in gold benefited from falling interest rates and heightened geopolitical uncertainty

↑ A long position in Brent oil, held early in the year, contributed as rising geopolitical tensions caused oil prices to peak in April

Line Graph [Table Text Block]

	Class I	MSCI World Net Index	Bloomberg U.S. Treasury Bill 1-3 Month Index	MSIF Multi-Asset Real Return Blend Index
6/18	$1,000,000	$1,000,000	$1,000,000	$1,000,000
6/18	$1,000,000	$1,000,000	$1,000,000	$1,000,000
7/18	$1,016,000	$1,014,032	$1,002,241	$1,014,032
8/18	$1,016,000	$1,026,578	$1,003,859	$1,026,578
9/18	$1,008,000	$1,032,294	$1,005,498	$1,032,294
10/18	$964,634	$956,495	$1,007,307	$956,495
11/18	$973,705	$967,361	$1,009,151	$967,361
12/18	$932,969	$893,805	$1,011,087	$893,805
1/19	$998,875	$963,348	$1,013,134	$963,348
2/19	$1,012,262	$992,315	$1,014,972	$992,315
3/19	$1,033,887	$1,005,349	$1,017,094	$1,005,349
4/19	$1,045,722	$1,040,998	$1,019,071	$1,040,998
5/19	$1,025,056	$980,931	$1,021,232	$980,931
6/19	$1,050,889	$1,045,570	$1,023,382	$1,045,570
7/19	$1,039,614	$1,050,749	$1,025,265	$1,050,749
8/19	$1,038,575	$1,029,256	$1,027,086	$1,029,256
9/19	$1,055,209	$1,051,160	$1,028,907	$1,051,160
10/19	$1,071,170	$1,077,909	$1,030,700	$1,077,909
11/19	$1,076,395	$1,107,929	$1,031,954	$1,107,929
12/19	$1,104,143	$1,141,121	$1,033,412	$1,141,121
1/20	$1,105,193	$1,134,175	$1,034,732	$1,134,175
2/20	$1,049,514	$1,038,309	$1,036,115	$1,038,309
3/20	$899,283	$900,896	$1,038,260	$900,896
4/20	$961,906	$999,314	$1,038,290	$999,314
5/20	$971,409	$1,047,589	$1,038,350	$1,047,589
6/20	$984,079	$1,075,299	$1,038,467	$1,075,299
7/20	$998,043	$1,126,743	$1,038,614	$1,126,743
8/20	$1,027,678	$1,202,025	$1,038,693	$1,202,025
9/20	$1,000,160	$1,160,557	$1,038,782	$1,160,557
10/20	$975,607	$1,124,956	$1,038,865	$1,124,956
11/20	$1,084,126	$1,268,795	$1,038,948	$1,268,795
12/20	$1,108,454	$1,322,588	$1,039,030	$1,322,588
1/21	$1,098,843	$1,309,443	$1,039,106	$1,309,443
2/21	$1,116,997	$1,342,997	$1,039,162	$1,342,997
3/21	$1,150,101	$1,387,681	$1,039,211	$1,387,681
4/21	$1,202,736	$1,452,264	$1,039,224	$1,452,264
5/21	$1,223,085	$1,473,184	$1,039,233	$1,473,184
6/21	$1,231,653	$1,495,142	$1,039,212	$1,495,142
7/21	$1,257,362	$1,521,924	$1,039,256	$1,521,924
8/21	$1,270,292	$1,559,802	$1,039,299	$1,562,328
9/21	$1,251,975	$1,495,038	$1,039,334	$1,562,380
10/21	$1,306,924	$1,579,718	$1,039,348	$1,562,401
11/21	$1,317,699	$1,545,102	$1,039,408	$1,562,491
12/21	$1,353,543	$1,611,140	$1,039,457	$1,562,565
1/22	$1,352,305	$1,525,893	$1,039,487	$1,562,610
2/22	$1,395,648	$1,487,301	$1,039,569	$1,562,733
3/22	$1,401,840	$1,528,118	$1,039,789	$1,563,064
4/22	$1,396,886	$1,401,172	$1,040,006	$1,563,391
5/22	$1,388,217	$1,402,233	$1,040,519	$1,564,162
6/22	$1,290,386	$1,280,769	$1,041,070	$1,564,989
7/22	$1,351,066	$1,382,457	$1,041,926	$1,566,277
8/22	$1,306,485	$1,324,660	$1,043,850	$1,569,169
9/22	$1,258,188	$1,201,520	$1,045,982	$1,572,374
10/22	$1,284,194	$1,287,804	$1,048,258	$1,575,795
11/22	$1,382,026	$1,377,346	$1,051,550	$1,580,745
12/22	$1,395,673	$1,318,854	$1,055,262	$1,586,325
1/23	$1,437,026	$1,412,171	$1,058,846	$1,591,712
2/23	$1,399,550	$1,378,224	$1,062,546	$1,597,273
3/23	$1,418,934	$1,420,811	$1,066,785	$1,603,646
4/23	$1,416,349	$1,445,717	$1,070,913	$1,609,852
5/23	$1,385,334	$1,431,284	$1,075,239	$1,616,354
6/23	$1,376,288	$1,517,845	$1,079,849	$1,623,284
7/23	$1,413,765	$1,568,833	$1,084,580	$1,630,396
8/23	$1,399,550	$1,531,361	$1,089,521	$1,637,823
9/23	$1,347,858	$1,465,300	$1,094,363	$1,645,102
10/23	$1,349,150	$1,422,783	$1,099,407	$1,652,686
11/23	$1,422,811	$1,556,172	$1,104,329	$1,660,084
12/23	$1,471,210	$1,632,571	$1,109,478	$1,667,824
1/24	$1,454,939	$1,652,163	$1,114,319	$1,675,102
2/24	$1,448,159	$1,722,211	$1,119,009	$1,682,152
3/24	$1,471,210	$1,777,554	$1,124,124	$1,689,841
4/24	$1,440,023	$1,711,527	$1,129,022	$1,697,203
5/24	$1,467,142	$1,787,950	$1,134,509	$1,705,451
6/24	$1,461,718	$1,824,331	$1,139,202	$1,712,507
7/24	$1,501,041	$1,856,480	$1,144,345	$1,720,238
8/24	$1,513,245	$1,905,548	$1,149,857	$1,728,523
9/24	$1,543,076	$1,940,446	$1,154,744	$1,735,871
10/24	$1,522,736	$1,901,954	$1,159,314	$1,742,740
11/24	$1,517,312	$1,989,228	$1,163,872	$1,749,592
12/24	$1,469,791	$1,937,387	$1,168,482	$1,756,522

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 6/18/18 (Inception)
Class I	(0.10)%	5.89%	6.07%
MSCI World Net Index	18.67%	11.17%	10.65%
Bloomberg U.S. Treasury Bill 1-3 Month Index	5.32%	2.49%	2.41%
MSIF Multi-Asset Real Return Blend Index	5.32%	9.01%	9.00%

Performance Inception Date

Jun. 18, 2018

AssetsNet

$ 7,415,322

Holdings Count | Holding

216

Advisory Fees Paid, Amount

$ 0

InvestmentCompanyPortfolioTurnover

310.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$7,415,322
# of Portfolio Holdings	216
Portfolio Turnover Rate	310%
Total Advisory Fees Paid (Net of Waivers)	$0

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	1.0%
China	0.3%
South Africa	0.3%
Germany	0.4%
Switzerland	0.6%
Japan	0.7%
France	0.8%
Australia	1.7%
United Kingdom	1.9%
Canada	4.6%
United States	87.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000200802

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Multi-Asset Real Return Portfolio

Class Name

Class R6

Trading Symbol

MRJSX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Multi-Asset Real Return Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$71	0.71%

Expenses Paid, Amount

$ 71

Expense Ratio, Percent

0.71%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the Bloomberg U.S. Treasury Bills 1-3 Month Index:

↓ A long position in GSCI commodities detracted due to weakness in energy prices in the second half of the year

↓ A long position in world energy stocks was negatively impacted by falling energy prices following the peak in April 2024

↓ A long position in world materials stocks was weighed down by weaker industrial production and demand for input goods

↑ A long position in U.S. 10-year Treasury inflation-protected securities (TIPS) contributed as the Federal Reserve cut interests rates in 2024

↑A long position in gold benefited from falling interest rates and heightened geopolitical uncertainty

↑ A long position in Brent oil, held early in the year, contributed as rising geopolitical tensions caused oil prices to peak in April

Line Graph [Table Text Block]

	Class R6	MSCI World Net Index	Bloomberg U.S. Treasury Bill 1-3 Month Index	MSIF Multi-Asset Real Return Blend Index
6/18	$5,000,000	$5,000,000	$5,000,000	$5,000,000
6/18	$5,000,000	$5,000,000	$5,000,000	$5,000,000
7/18	$5,080,000	$5,070,159	$5,011,203	$5,070,159
8/18	$5,080,000	$5,132,891	$5,019,295	$5,132,891
9/18	$5,040,000	$5,161,471	$5,027,491	$5,161,471
10/18	$4,823,357	$4,782,475	$5,036,534	$4,782,475
11/18	$4,868,717	$4,836,803	$5,045,754	$4,836,803
12/18	$4,665,315	$4,469,023	$5,055,437	$4,469,023
1/19	$4,994,873	$4,816,738	$5,065,672	$4,816,738
2/19	$5,061,815	$4,961,577	$5,074,858	$4,961,577
3/19	$5,169,951	$5,026,745	$5,085,469	$5,026,745
4/19	$5,224,055	$5,204,990	$5,095,356	$5,204,990
5/19	$5,125,878	$4,904,657	$5,106,161	$4,904,657
6/19	$5,255,058	$5,227,849	$5,116,909	$5,227,849
7/19	$5,199,002	$5,253,744	$5,126,324	$5,253,744
8/19	$5,193,803	$5,146,281	$5,135,432	$5,146,281
9/19	$5,276,987	$5,255,799	$5,144,535	$5,255,799
10/19	$5,357,095	$5,389,546	$5,153,499	$5,389,546
11/19	$5,383,227	$5,539,646	$5,159,769	$5,539,646
12/19	$5,522,285	$5,705,604	$5,167,061	$5,705,604
1/20	$5,527,540	$5,670,876	$5,173,660	$5,670,876
2/20	$5,249,061	$5,191,544	$5,180,574	$5,191,544
3/20	$4,497,694	$4,504,481	$5,191,302	$4,504,481
4/20	$4,811,074	$4,996,570	$5,191,448	$4,996,570
5/20	$4,858,604	$5,237,945	$5,191,750	$5,237,945
6/20	$4,921,977	$5,376,494	$5,192,335	$5,376,494
7/20	$4,986,708	$5,633,713	$5,193,069	$5,633,713
8/20	$5,140,227	$6,010,127	$5,193,465	$6,010,127
9/20	$5,002,589	$5,802,783	$5,193,909	$5,802,783
10/20	$4,879,968	$5,624,782	$5,194,323	$5,624,782
11/20	$5,422,778	$6,343,975	$5,194,742	$6,343,975
12/20	$5,545,383	$6,612,939	$5,195,148	$6,612,939
1/21	$5,491,959	$6,547,215	$5,195,531	$6,547,215
2/21	$5,582,780	$6,714,983	$5,195,808	$6,714,983
3/21	$5,753,735	$6,938,405	$5,196,054	$6,938,405
4/21	$6,012,031	$7,261,319	$5,196,118	$7,261,319
5/21	$6,119,197	$7,365,921	$5,196,167	$7,365,921
6/21	$6,162,064	$7,475,709	$5,196,062	$7,475,709
7/21	$6,291,119	$7,609,620	$5,196,279	$7,609,620
8/21	$6,355,809	$7,799,011	$5,196,495	$7,811,638
9/21	$6,258,774	$7,475,192	$5,196,670	$7,811,901
10/21	$6,539,098	$7,898,591	$5,196,740	$7,812,007
11/21	$6,593,006	$7,725,509	$5,197,038	$7,812,454
12/21	$6,774,123	$8,055,699	$5,197,286	$7,812,827
1/22	$6,767,926	$7,629,465	$5,197,435	$7,813,052
2/22	$6,978,648	$7,436,506	$5,197,843	$7,813,664
3/22	$7,009,637	$7,640,589	$5,198,945	$7,815,321
4/22	$6,991,044	$7,005,860	$5,200,031	$7,816,954
5/22	$6,947,660	$7,011,166	$5,202,595	$7,820,809
6/22	$6,458,039	$6,403,845	$5,205,348	$7,824,947
7/22	$6,761,728	$6,912,287	$5,209,630	$7,831,383
8/22	$6,538,609	$6,623,299	$5,219,250	$7,845,844
9/22	$6,296,898	$6,007,598	$5,229,912	$7,861,872
10/22	$6,427,050	$6,439,021	$5,241,288	$7,878,973
11/22	$6,916,671	$6,886,729	$5,257,752	$7,903,723
12/22	$6,988,092	$6,594,268	$5,276,312	$7,931,624
1/23	$7,195,147	$7,060,853	$5,294,231	$7,958,560
2/23	$7,001,033	$6,891,120	$5,312,728	$7,986,365
3/23	$7,104,560	$7,104,054	$5,333,927	$8,018,232
4/23	$7,091,620	$7,228,585	$5,354,567	$8,049,261
5/23	$6,936,329	$7,156,419	$5,376,193	$8,081,769
6/23	$6,891,035	$7,589,224	$5,399,244	$8,116,421
7/23	$7,078,679	$7,844,167	$5,422,900	$8,151,982
8/23	$7,007,504	$7,656,804	$5,447,604	$8,189,117
9/23	$6,748,685	$7,326,501	$5,471,813	$8,225,511
10/23	$6,755,156	$7,113,917	$5,497,037	$8,263,428
11/23	$7,130,442	$7,780,862	$5,521,644	$8,300,418
12/23	$7,369,937	$8,162,857	$5,547,390	$8,339,121
1/24	$7,288,426	$8,260,815	$5,571,597	$8,375,511
2/24	$7,247,671	$8,611,055	$5,595,046	$8,410,760
3/24	$7,369,937	$8,887,769	$5,620,621	$8,449,206
4/24	$7,213,708	$8,557,636	$5,645,108	$8,486,016
5/24	$7,342,767	$8,939,752	$5,672,543	$8,527,257
6/24	$7,322,389	$9,121,657	$5,696,010	$8,562,535
7/24	$7,519,374	$9,282,402	$5,721,723	$8,601,188
8/24	$7,580,507	$9,527,741	$5,749,283	$8,642,617
9/24	$7,729,943	$9,702,231	$5,773,722	$8,679,356
10/24	$7,628,055	$9,509,769	$5,796,569	$8,713,701
11/24	$7,600,885	$9,946,140	$5,819,360	$8,747,961
12/24	$7,355,765	$9,686,937	$5,842,411	$8,782,612

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	Since 6/18/18 (Inception)
Class R6	(0.19)%	5.90%	6.08%
MSCI World Net Index	18.67%	11.17%	10.65%
Bloomberg U.S. Treasury Bill 1-3 Month Index	5.32%	2.49%	2.41%
MSIF Multi-Asset Real Return Blend Index	5.32%	9.01%	9.00%

Performance Inception Date

Jun. 18, 2018

AssetsNet

$ 7,415,322

Holdings Count | Holding

216

Advisory Fees Paid, Amount

$ 0

InvestmentCompanyPortfolioTurnover

310.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$7,415,322
# of Portfolio Holdings	216
Portfolio Turnover Rate	310%
Total Advisory Fees Paid (Net of Waivers)	$0

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	1.0%
China	0.3%
South Africa	0.3%
Germany	0.4%
Switzerland	0.6%
Japan	0.7%
France	0.8%
Australia	1.7%
United Kingdom	1.9%
Canada	4.6%
United States	87.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000115786

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Next Gen Emerging Markets Portfolio

Class Name

Class A

Trading Symbol

MFMPX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Next Gen Emerging Markets Portfolio for the period of January 1, 2024 to December 31, 2024.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$170	1.60%

Expenses Paid, Amount

$ 170

Expense Ratio, Percent

1.60%

Factors Affecting Performance [Text Block]

How did the Fund perform last year and what affected its performance?

Key contributors to (↑) and detractors from (↓) performance, relative to the MSCI Frontier Emerging Markets Net Index:

↑ Positioning in Vietnam, through allocations to an IT outsourcing company and an electronics and grocery retailer

↑The underweight allocation to and stock selection in the Philippines

↑ The allocation to a fast-growing online travel agency in Argentina

↑ The overweight allocation to and stock selection in Egypt, led by a position in a leading bank

↑ Positioning in the U.A.E, through the allocation to a local real estate developer

↓The allocations to select positions in Poland, which were exited during the year

↓ The allocations to select IT services companies hurt by an extended slowdown in IT spending globally

↓ The underweight allocation to Peru

Line Graph [Table Text Block]

	Class A with maximum sales charge	MSCI Frontier Emerging Markets Net Index	MSCI Frontier Markets/MSCI Frontier Emerging Markets Blend Index
12/14	$9,473	$10,000	$10,000
1/15	$9,275	$9,819	$9,592
2/15	$9,528	$9,946	$9,873
3/15	$9,359	$9,758	$9,689
4/15	$9,771	$10,129	$10,053
5/15	$9,409	$9,691	$9,694
6/15	$9,409	$9,643	$9,685
7/15	$9,329	$9,277	$9,401
8/15	$8,674	$8,570	$8,862
9/15	$8,515	$8,392	$8,661
10/15	$8,813	$8,699	$8,978
11/15	$8,400	$8,157	$8,580
12/15	$8,441	$8,170	$8,554
1/16	$7,842	$7,702	$7,969
2/16	$8,047	$7,926	$8,248
3/16	$8,251	$8,581	$8,474
4/16	$8,456	$8,813	$8,733
5/16	$8,461	$8,796	$8,821
6/16	$8,381	$8,894	$8,514
7/16	$8,681	$9,054	$8,619
8/16	$8,736	$9,007	$8,521
9/16	$8,821	$8,962	$8,739
10/16	$8,701	$8,885	$8,705
11/16	$8,461	$8,361	$8,550
12/16	$8,736	$8,579	$8,782
1/17	$9,130	$9,100	$9,367
2/17	$9,195	$9,045	$9,333
3/17	$9,357	$9,214	$9,563
4/17	$9,559	$9,370	$9,675
5/17	$9,892	$9,762	$10,088
6/17	$9,831	$9,747	$10,150
7/17	$9,821	$9,969	$10,364
8/17	$9,852	$10,160	$10,746
9/17	$10,089	$10,355	$10,965
10/17	$10,124	$10,368	$11,100
11/17	$10,159	$10,487	$11,229
12/17	$10,518	$10,877	$11,580
1/18	$11,144	$11,385	$12,244
2/18	$10,937	$11,059	$12,061
3/18	$11,113	$11,050	$12,171
4/18	$10,755	$10,967	$11,787
5/18	$9,554	$10,157	$10,701
6/18	$9,165	$9,832	$10,322
7/18	$9,390	$10,176	$10,700
8/18	$8,750	$9,847	$10,123
9/18	$8,602	$9,675	$10,118
10/18	$8,191	$9,287	$9,760
11/18	$8,394	$9,433	$9,972
12/18	$8,119	$9,289	$9,680
1/19	$8,618	$9,946	$10,140
2/19	$8,613	$10,000	$10,221
3/19	$8,587	$10,166	$10,345
4/19	$8,655	$10,207	$10,363
5/19	$8,868	$10,154	$10,587
6/19	$9,112	$10,646	$10,830
7/19	$9,169	$10,684	$11,102
8/19	$8,982	$10,023	$10,925
9/19	$8,847	$9,929	$10,711
10/19	$8,800	$10,188	$10,798
11/19	$8,998	$10,135	$10,946
12/19	$9,104	$10,598	$11,421
1/20	$9,014	$10,258	$11,415
2/20	$8,409	$9,578	$10,743
3/20	$6,365	$7,253	$8,384
4/20	$7,119	$7,836	$8,949
5/20	$7,947	$8,146	$9,461
6/20	$8,297	$8,419	$9,620
7/20	$8,478	$8,417	$9,554
8/20	$9,205	$8,886	$10,341
9/20	$9,110	$8,785	$10,418
10/20	$9,014	$8,977	$10,527
11/20	$9,879	$9,633	$10,958
12/20	$10,340	$10,316	$11,584
1/21	$10,568	$9,842	$11,628
2/21	$11,041	$10,034	$11,643
3/21	$10,770	$9,689	$11,677
4/21	$11,370	$9,894	$12,476
5/21	$11,694	$10,298	$12,977
6/21	$12,145	$10,385	$13,249
7/21	$12,161	$9,988	$12,743
8/21	$12,883	$10,676	$13,621
9/21	$12,453	$10,553	$13,464
10/21	$12,936	$11,106	$14,169
11/21	$12,225	$10,683	$13,630
12/21	$11,880	$10,759	$13,726
1/22	$10,499	$10,840	$13,830
2/22	$8,677	$10,702	$13,654
3/22	$9,023	$10,811	$13,793
4/22	$8,168	$10,112	$12,902
5/22	$8,157	$9,920	$12,656
6/22	$7,509	$8,831	$11,267
7/22	$7,732	$8,965	$11,438
8/22	$7,950	$9,072	$11,574
9/22	$7,286	$8,065	$10,289
10/22	$7,419	$8,239	$10,512
11/22	$7,663	$8,970	$11,444
12/22	$7,387	$8,803	$11,231
1/23	$7,695	$9,234	$11,781
2/23	$7,419	$8,876	$11,324
3/23	$7,483	$9,013	$11,499
4/23	$7,483	$9,107	$11,619
5/23	$7,127	$8,881	$11,331
6/23	$7,323	$9,193	$11,729
7/23	$7,785	$9,781	$12,479
8/23	$7,769	$9,356	$11,937
9/23	$7,652	$9,161	$11,688
10/23	$7,100	$8,682	$11,077
11/23	$7,637	$9,341	$11,918
12/23	$7,851	$9,845	$12,560
1/24	$7,733	$9,983	$12,737
2/24	$8,076	$10,134	$12,929
3/24	$8,307	$10,394	$13,261
4/24	$8,055	$10,071	$12,849
5/24	$8,205	$10,267	$13,098
6/24	$8,226	$10,176	$12,983
7/24	$8,414	$10,422	$13,297
8/24	$8,746	$10,773	$13,745
9/24	$8,757	$11,024	$14,065
10/24	$8,704	$10,808	$13,789
11/24	$8,725	$10,528	$13,432
12/24	$8,792	$10,461	$13,346

Average Annual Return [Table Text Block]

AATR	1 Year	5 Years	10 Years
Class A	11.99%	(0.70)%	(0.74)%
Class A, with 5.25% maximum front end sales charge	6.11%	(1.76)%	(1.28)%
MSCI Frontier Emerging Markets Net Index	6.26%	(0.26)%	0.45%
MSCI Frontier Markets/MSCI Frontier Emerging Markets Blend Index	6.26%	3.16%	2.93%

AssetsNet

$ 21,546,460

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 0

InvestmentCompanyPortfolioTurnover

40.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$21,546,460
# of Portfolio Holdings	42
Portfolio Turnover Rate	40%
Total Advisory Fees Paid (Net of Waivers)	$0

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other	14.4%
Slovenia	3.0%
Argentina	3.9%
Bangladesh	4.1%
Egypt	4.8%
Pakistan	6.1%
Kazakhstan	8.4%
Philippines	8.6%
United States	8.9%
Indonesia	14.2%
Vietnam	23.6%

Top Ten Holdings (% of total investments)^{Footnote Referencea}

FPT Corp.	8.4%
Century Pacific Food, Inc.	4.2%
Medikaloka Hermina Tbk. PT	4.2%
Systems Ltd.	4.0%
MercadoLibre, Inc.	3.9%
Phu Nhuan Jewelry JSC	3.9%
NAC Kazatomprom JSC	3.6%
Map Aktif Adiperkasa PT	3.6%
Bank for Foreign Trade of Vietnam JSC	3.0%
Nova Ljubljanska Banka DD	3.0%
Total	41.8%

Footnote	Description
Footnote^a	Excluding cash equivalents.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155910

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Next Gen Emerging Markets Portfolio

Class Name

Class C

Trading Symbol

MSFEX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$248	2.35%

Expenses Paid, Amount

$ 248

Expense Ratio, Percent

2.35%