v3.25.2
Shareholder Report
12 Months Ended
Jul. 31, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name AB LARGE CAP GROWTH FUND INC
Entity Central Index Key 0000889508
Entity Investment Company Type N-1A
Document Period End Date Jul. 31, 2025
C000028342  
Shareholder Report [Line Items]  
Fund Name AB Large Cap Growth Fund
Class Name Advisor Class
Trading Symbol APGYX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the AB Large Cap Growth Fund (the “Fund”) for the period of August 1, 2024 to July 31, 2025.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block] You can find additional information about the Fund at https://www.abfunds.com/link/AB/APGYX-A. You can also request this information by contacting us at (800) 227 4618.
Additional Information Phone Number (800) 227 4618
Additional Information Website https://www.abfunds.com/link/AB/APGYX-A
Expenses [Text Block]

What were the Fund costs for the last year?

(Based on a hypothetical $10,000 investment)

Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Advisor Class
$60
0.55%
Expenses Paid, Amount $ 60
Expense Ratio, Percent 0.55%
Factors Affecting Performance [Text Block]

How did the Fund perform last year? What affected the Fund’s performance?

During the 12-month period ended July 31, 2025, all share classes of the Fund underperformed the Russell 1000 Growth index (the "benchmark"), before sales charges. Overall sector allocation and security selection were negative, which drove underperformance, relative to the benchmark. Overweights to health care and consumer staples and an underweight to technology detracted from performance, while an overweight to communication services and underweights to consumer discretionary and real estate contributed. Security selection within industrials, consumer discretionary and health detracted, while selection within communication services, technology and consumer staples contributed to the Fund's absolute returns throughout the reporting period.

Performance Past Does Not Indicate Future [Text] <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 15.6px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">The Fund’s past performance is not a good predictor of the Fund’s future performance.</span>
Line Graph [Table Text Block]
Growth of 10K Chart
Advisor Class
S&P 500 Index
Russell 1000 Growth Index
07/15
$10,000
$10,000
$10,000
07/16
$10,385
$10,561
$10,435
07/17
$12,320
$12,256
$12,318
07/18
$15,120
$14,246
$15,132
07/19
$17,081
$15,384
$16,770
07/20
$22,021
$17,223
$21,774
07/21
$30,123
$23,500
$29,760
07/22
$25,760
$22,410
$26,210
07/23
$28,895
$25,327
$30,747
07/24
$36,035
$30,936
$39,029
07/25
$42,409
$35,989
$48,297
Average Annual Return [Table Text Block]
AATR
1 Year
5 Years
10 Years
Advisor Class
17.68%
14.00%
15.54%
S&P 500 Index
16.33%
15.88%
13.66%
Russell 1000 Growth Index
23.75%
17.27%
17.06%
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption or sale of Fund shares.
AssetsNet $ 27,503,262,935
Holdings Count | Holding 56
Advisory Fees Paid, Amount $ 127,310,383
InvestmentCompanyPortfolioTurnover 25.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Net Assets
$27,503,262,935
# of Portfolio Holdings
56
Portfolio Turnover Rate
25%
Total Advisory Fees Paid (Net)
$127,310,383
Holdings [Text Block]

Sector Breakdown (% of Net Assets)

Group By Sector Chart
Value
Value
Information Technology
40.9%
Communication Services
17.2%
Consumer Discretionary
12.8%
Health Care
10.8%
Financials
6.5%
Industrials
5.6%
Consumer Staples
4.7%
Materials
1.2%
Short-Term Investments
0.5%
Other assets less liabilities
-0.2%
Largest Holdings [Text Block]

10 Top Holdings

Company
U.S. $ Value
% of Net Assets
NVIDIA Corp.
$3,300,230,574
12.0%
Microsoft Corp.
$2,607,912,318
9.5%
Amazon.com, Inc.
$1,888,492,328
6.9%
Meta Platforms, Inc. - Class A
$1,879,569,802
6.8%
Broadcom, Inc.
$1,512,080,381
5.5%
Alphabet, Inc. - Class C
$1,498,078,622
5.4%
Netflix, Inc.
$1,266,505,372
4.6%
Visa, Inc. - Class A
$1,167,324,820
4.2%
Costco Wholesale Corp.
$682,350,594
2.5%
Eli Lilly & Co.
$652,871,992
2.4%
Total
$16,455,416,803
59.8%
Material Fund Change [Text Block]
C000028338  
Shareholder Report [Line Items]  
Fund Name AB Large Cap Growth Fund
Class Name Class A
Trading Symbol APGAX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the AB Large Cap Growth Fund (the “Fund”) for the period of August 1, 2024 to July 31, 2025.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block] You can find additional information about the Fund at https://www.abfunds.com/link/AB/APGAX-A. You can also request this information by contacting us at (800) 227 4618.
Additional Information Phone Number (800) 227 4618
Additional Information Website https://www.abfunds.com/link/AB/APGAX-A
Expenses [Text Block]

What were the Fund costs for the last year?

(Based on a hypothetical $10,000 investment)

Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$87
0.80%
Expenses Paid, Amount $ 87
Expense Ratio, Percent 0.80%
Factors Affecting Performance [Text Block]

How did the Fund perform last year? What affected the Fund’s performance?

During the 12-month period ended July 31, 2025, all share classes of the Fund underperformed the Russell 1000 Growth index (the "benchmark"), before sales charges. Overall sector allocation and security selection were negative, which drove underperformance, relative to the benchmark. Overweights to health care and consumer staples and an underweight to technology detracted from performance, while an overweight to communication services and underweights to consumer discretionary and real estate contributed. Security selection within industrials, consumer discretionary and health detracted, while selection within communication services, technology and consumer staples contributed to the Fund's absolute returns throughout the reporting period.

Performance Past Does Not Indicate Future [Text] <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 15.6px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">The Fund’s past performance is not a good predictor of the Fund’s future performance.</span>
Line Graph [Table Text Block]
Growth of 10K Chart
Class A (with sales charges)
S&P 500 Index
Russell 1000 Growth Index
07/15
$9,575
$10,000
$10,000
07/16
$9,919
$10,561
$10,435
07/17
$11,737
$12,256
$12,318
07/18
$14,369
$14,246
$15,132
07/19
$16,194
$15,384
$16,770
07/20
$20,826
$17,223
$21,774
07/21
$28,415
$23,500
$29,760
07/22
$24,236
$22,410
$26,210
07/23
$27,119
$25,327
$30,747
07/24
$33,737
$30,936
$39,029
07/25
$39,603
$35,989
$48,297
Average Annual Return [Table Text Block]
AATR
1 Year
5 Years
10 Years
Class A (without sales charges)
17.39%
13.72%
15.26%
Class A (with sales charges)
12.39%
12.73%
14.76%
S&P 500 Index
16.33%
15.88%
13.66%
Russell 1000 Growth Index
23.75%
17.27%
17.06%
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption or sale of Fund shares.
AssetsNet $ 27,503,262,935
Holdings Count | Holding 56
Advisory Fees Paid, Amount $ 127,310,383
InvestmentCompanyPortfolioTurnover 25.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Net Assets
$27,503,262,935
# of Portfolio Holdings
56
Portfolio Turnover Rate
25%
Total Advisory Fees Paid (Net)
$127,310,383
Holdings [Text Block]

Sector Breakdown (% of Net Assets)

Group By Sector Chart
Value
Value
Information Technology
40.9%
Communication Services
17.2%
Consumer Discretionary
12.8%
Health Care
10.8%
Financials
6.5%
Industrials
5.6%
Consumer Staples
4.7%
Materials
1.2%
Short-Term Investments
0.5%
Other assets less liabilities
-0.2%
Largest Holdings [Text Block]

10 Top Holdings

Company
U.S. $ Value
% of Net Assets
NVIDIA Corp.
$3,300,230,574
12.0%
Microsoft Corp.
$2,607,912,318
9.5%
Amazon.com, Inc.
$1,888,492,328
6.9%
Meta Platforms, Inc. - Class A
$1,879,569,802
6.8%
Broadcom, Inc.
$1,512,080,381
5.5%
Alphabet, Inc. - Class C
$1,498,078,622
5.4%
Netflix, Inc.
$1,266,505,372
4.6%
Visa, Inc. - Class A
$1,167,324,820
4.2%
Costco Wholesale Corp.
$682,350,594
2.5%
Eli Lilly & Co.
$652,871,992
2.4%
Total
$16,455,416,803
59.8%
Material Fund Change [Text Block]
C000028341  
Shareholder Report [Line Items]  
Fund Name AB Large Cap Growth Fund
Class Name Class C
Trading Symbol APGCX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the AB Large Cap Growth Fund (the “Fund”) for the period of August 1, 2024 to July 31, 2025.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block] You can find additional information about the Fund at https://www.abfunds.com/link/AB/APGCX-A. You can also request this information by contacting us at (800) 227 4618.
Additional Information Phone Number (800) 227 4618
Additional Information Website https://www.abfunds.com/link/AB/APGCX-A
Expenses [Text Block]

What were the Fund costs for the last year?

(Based on a hypothetical $10,000 investment)

Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$168
1.55%
Expenses Paid, Amount $ 168
Expense Ratio, Percent 1.55%
Factors Affecting Performance [Text Block]

How did the Fund perform last year? What affected the Fund’s performance?

During the 12-month period ended July 31, 2025, all share classes of the Fund underperformed the Russell 1000 Growth index (the "benchmark"), before sales charges. Overall sector allocation and security selection were negative, which drove underperformance, relative to the benchmark. Overweights to health care and consumer staples and an underweight to technology detracted from performance, while an overweight to communication services and underweights to consumer discretionary and real estate contributed. Security selection within industrials, consumer discretionary and health detracted, while selection within communication services, technology and consumer staples contributed to the Fund's absolute returns throughout the reporting period.

Performance Past Does Not Indicate Future [Text] <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 15.6px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">The Fund’s past performance is not a good predictor of the Fund’s future performance.</span>
Line Graph [Table Text Block]
Growth of 10K Chart
Class C (with sales charges)
S&P 500 Index
Russell 1000 Growth Index
07/15
$10,000
$10,000
$10,000
07/16
$10,282
$10,561
$10,435
07/17
$12,078
$12,256
$12,318
07/18
$14,676
$14,246
$15,132
07/19
$16,415
$15,384
$16,770
07/20
$20,951
$17,223
$21,774
07/21
$28,376
$23,500
$29,760
07/22
$24,024
$22,410
$26,210
07/23
$26,677
$25,327
$30,747
07/24
$32,942
$30,936
$39,029
07/25
$38,380
$35,989
$48,297
Average Annual Return [Table Text Block]
AATR
1 Year
5 Years
10 Years
Class C (without sales charges)
16.51%
12.87%
14.40%
Class C (with sales charges)
15.51%
12.87%
14.40%
S&P 500 Index
16.33%
15.88%
13.66%
Russell 1000 Growth Index
23.75%
17.27%
17.06%
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption or sale of Fund shares.
AssetsNet $ 27,503,262,935
Holdings Count | Holding 56
Advisory Fees Paid, Amount $ 127,310,383
InvestmentCompanyPortfolioTurnover 25.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Net Assets
$27,503,262,935
# of Portfolio Holdings
56
Portfolio Turnover Rate
25%
Total Advisory Fees Paid (Net)
$127,310,383
Holdings [Text Block]

Sector Breakdown (% of Net Assets)

Group By Sector Chart
Value
Value
Information Technology
40.9%
Communication Services
17.2%
Consumer Discretionary
12.8%
Health Care
10.8%
Financials
6.5%
Industrials
5.6%
Consumer Staples
4.7%
Materials
1.2%
Short-Term Investments
0.5%
Other assets less liabilities
-0.2%
Largest Holdings [Text Block]

10 Top Holdings

Company
U.S. $ Value
% of Net Assets
NVIDIA Corp.
$3,300,230,574
12.0%
Microsoft Corp.
$2,607,912,318
9.5%
Amazon.com, Inc.
$1,888,492,328
6.9%
Meta Platforms, Inc. - Class A
$1,879,569,802
6.8%
Broadcom, Inc.
$1,512,080,381
5.5%
Alphabet, Inc. - Class C
$1,498,078,622
5.4%
Netflix, Inc.
$1,266,505,372
4.6%
Visa, Inc. - Class A
$1,167,324,820
4.2%
Costco Wholesale Corp.
$682,350,594
2.5%
Eli Lilly & Co.
$652,871,992
2.4%
Total
$16,455,416,803
59.8%
Material Fund Change [Text Block]
C000028345  
Shareholder Report [Line Items]  
Fund Name AB Large Cap Growth Fund
Class Name Class I
Trading Symbol ALLIX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the AB Large Cap Growth Fund (the “Fund”) for the period of August 1, 2024 to July 31, 2025.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block] You can find additional information about the Fund at https://www.abfunds.com/link/AB/ALLIX-A. You can also request this information by contacting us at (800) 227 4618.
Additional Information Phone Number (800) 227 4618
Additional Information Website https://www.abfunds.com/link/AB/ALLIX-A
Expenses [Text Block]

What were the Fund costs for the last year?

(Based on a hypothetical $10,000 investment)

Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I
$65
0.60%
Expenses Paid, Amount $ 65
Expense Ratio, Percent 0.60%
Factors Affecting Performance [Text Block]

How did the Fund perform last year? What affected the Fund’s performance?

During the 12-month period ended July 31, 2025, all share classes of the Fund underperformed the Russell 1000 Growth index (the "benchmark"), before sales charges. Overall sector allocation and security selection were negative, which drove underperformance, relative to the benchmark. Overweights to health care and consumer staples and an underweight to technology detracted from performance, while an overweight to communication services and underweights to consumer discretionary and real estate contributed. Security selection within industrials, consumer discretionary and health detracted, while selection within communication services, technology and consumer staples contributed to the Fund's absolute returns throughout the reporting period.

Performance Past Does Not Indicate Future [Text] <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 15.6px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">The Fund’s past performance is not a good predictor of the Fund’s future performance.</span>
Line Graph [Table Text Block]
Growth of 10K Chart
Class I
S&P 500 Index
Russell 1000 Growth Index
07/15
$10,000
$10,000
$10,000
07/16
$10,395
$10,561
$10,435
07/17
$12,332
$12,256
$12,318
07/18
$15,136
$14,246
$15,132
07/19
$17,103
$15,384
$16,770
07/20
$22,042
$17,223
$21,774
07/21
$30,140
$23,500
$29,760
07/22
$25,767
$22,410
$26,210
07/23
$28,903
$25,327
$30,747
07/24
$36,036
$30,936
$39,029
07/25
$42,372
$35,989
$48,297
Average Annual Return [Table Text Block]
AATR
1 Year
5 Years
10 Years
Class I
17.60%
13.96%
15.53%
S&P 500 Index
16.33%
15.88%
13.66%
Russell 1000 Growth Index
23.75%
17.27%
17.06%
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption or sale of Fund shares.
AssetsNet $ 27,503,262,935
Holdings Count | Holding 56
Advisory Fees Paid, Amount $ 127,310,383
InvestmentCompanyPortfolioTurnover 25.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Net Assets
$27,503,262,935
# of Portfolio Holdings
56
Portfolio Turnover Rate
25%
Total Advisory Fees Paid (Net)
$127,310,383
Holdings [Text Block]

Sector Breakdown (% of Net Assets)

Group By Sector Chart
Value
Value
Information Technology
40.9%
Communication Services
17.2%
Consumer Discretionary
12.8%
Health Care
10.8%
Financials
6.5%
Industrials
5.6%
Consumer Staples
4.7%
Materials
1.2%
Short-Term Investments
0.5%
Other assets less liabilities
-0.2%
Largest Holdings [Text Block]

10 Top Holdings

Company
U.S. $ Value
% of Net Assets
NVIDIA Corp.
$3,300,230,574
12.0%
Microsoft Corp.
$2,607,912,318
9.5%
Amazon.com, Inc.
$1,888,492,328
6.9%
Meta Platforms, Inc. - Class A
$1,879,569,802
6.8%
Broadcom, Inc.
$1,512,080,381
5.5%
Alphabet, Inc. - Class C
$1,498,078,622
5.4%
Netflix, Inc.
$1,266,505,372
4.6%
Visa, Inc. - Class A
$1,167,324,820
4.2%
Costco Wholesale Corp.
$682,350,594
2.5%
Eli Lilly & Co.
$652,871,992
2.4%
Total
$16,455,416,803
59.8%
Material Fund Change [Text Block]
C000159956  
Shareholder Report [Line Items]  
Fund Name AB Large Cap Growth Fund
Class Name Class Z
Trading Symbol APGZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the AB Large Cap Growth Fund (the “Fund”) for the period of August 1, 2024 to July 31, 2025.
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
Additional Information [Text Block] You can find additional information about the Fund at https://www.abfunds.com/link/AB/APGZX-A. You can also request this information by contacting us at (800) 227 4618.
Additional Information Phone Number (800) 227 4618
Additional Information Website https://www.abfunds.com/link/AB/APGZX-A
Expenses [Text Block]

What were the Fund costs for the last year?

(Based on a hypothetical $10,000 investment)

Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class Z
$54
0.50%
Expenses Paid, Amount $ 54
Expense Ratio, Percent 0.50%
Factors Affecting Performance [Text Block]

How did the Fund perform last year? What affected the Fund’s performance?

During the 12-month period ended July 31, 2025, all share classes of the Fund underperformed the Russell 1000 Growth index (the "benchmark"), before sales charges. Overall sector allocation and security selection were negative, which drove underperformance, relative to the benchmark. Overweights to health care and consumer staples and an underweight to technology detracted from performance, while an overweight to communication services and underweights to consumer discretionary and real estate contributed. Security selection within industrials, consumer discretionary and health detracted, while selection within communication services, technology and consumer staples contributed to the Fund's absolute returns throughout the reporting period.

Performance Past Does Not Indicate Future [Text] <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 15.6px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">The Fund’s past performance is not a good predictor of the Fund’s future performance.</span>
Line Graph [Table Text Block]
Growth of 10K Chart
Class Z
S&P 500 Index
Russell 1000 Growth Index
07/15
$10,000
$10,000
$10,000
07/16
$10,397
$10,561
$10,435
07/17
$12,349
$12,256
$12,318
07/18
$15,167
$14,246
$15,132
07/19
$17,151
$15,384
$16,770
07/20
$22,126
$17,223
$21,774
07/21
$30,285
$23,500
$29,760
07/22
$25,915
$22,410
$26,210
07/23
$29,090
$25,327
$30,747
07/24
$36,303
$30,936
$39,029
07/25
$42,728
$35,989
$48,297
Average Annual Return [Table Text Block]
AATR
1 Year
5 Years
10 Years
Class Z
17.69%
14.07%
15.63%
S&P 500 Index
16.33%
15.88%
13.66%
Russell 1000 Growth Index
23.75%
17.27%
17.06%
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption or sale of Fund shares.
AssetsNet $ 27,503,262,935
Holdings Count | Holding 56
Advisory Fees Paid, Amount $ 127,310,383
InvestmentCompanyPortfolioTurnover 25.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Net Assets
$27,503,262,935
# of Portfolio Holdings
56
Portfolio Turnover Rate
25%
Total Advisory Fees Paid (Net)
$127,310,383
Holdings [Text Block]

Sector Breakdown (% of Net Assets)

Group By Sector Chart
Value
Value
Information Technology
40.9%
Communication Services
17.2%
Consumer Discretionary
12.8%
Health Care
10.8%
Financials
6.5%
Industrials
5.6%
Consumer Staples
4.7%
Materials
1.2%
Short-Term Investments
0.5%
Other assets less liabilities
-0.2%
Largest Holdings [Text Block]

10 Top Holdings

Company
U.S. $ Value
% of Net Assets
NVIDIA Corp.
$3,300,230,574
12.0%
Microsoft Corp.
$2,607,912,318
9.5%
Amazon.com, Inc.
$1,888,492,328
6.9%
Meta Platforms, Inc. - Class A
$1,879,569,802
6.8%
Broadcom, Inc.
$1,512,080,381
5.5%
Alphabet, Inc. - Class C
$1,498,078,622
5.4%
Netflix, Inc.
$1,266,505,372
4.6%
Visa, Inc. - Class A
$1,167,324,820
4.2%
Costco Wholesale Corp.
$682,350,594
2.5%
Eli Lilly & Co.
$652,871,992
2.4%
Total
$16,455,416,803
59.8%
Material Fund Change [Text Block]