v3.26.1
Shareholder Report
 6 Months Ended
Jan. 31, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
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 Jan. 31, 2026
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
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 semi-annual shareholder report contains important information about the AB Large Cap Growth Fund (the “Fund”) for the period of August 1, 2025 to January 31, 2026.
Additional Information [Text Block] Fund
Additional Information Phone Number (800) 227 4618
Additional Information Website https://www.abfunds.com/link/AB/APGYX-S
Expenses [Text Block]

What were the Fund costs for the last six months?

(Based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Advisor Class
$28
0.54%Footnote Reference*
Footnote Description
Footnote*
 Annualized
Expenses Paid, Amount $ 28
Expense Ratio, Percent 0.54% [1]
AssetsNet $ 24,842,758,822
Holdings Count | Holding 61
Advisory Fees Paid, Amount $ 63,443,240
InvestmentCompanyPortfolioTurnover 17.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Net Assets
$24,842,758,822
# of Portfolio Holdings
61
Portfolio Turnover Rate
17%
Total Advisory Fees Paid (Net)
$63,443,240
Holdings [Text Block]

Sector Breakdown (% of Net Assets)

Table Summary
Information Technology
37.4%
Communication Services
18.1%
Consumer Discretionary
14.3%
Health Care
13.4%
Financials
5.6%
Consumer Staples
5.0%
Industrials
3.9%
Materials
1.2%
Short-Term Investments
1.2%
Other assets less liabilities
-0.1%
Total
100.0%
Largest Holdings [Text Block]

10 Top Holdings

Table Summary
Company
U.S. $ Value
% of Net Assets
NVIDIA Corp.
$2,637,688,036
10.6%
Alphabet, Inc. - Class C
$2,359,279,891
9.5%
Microsoft Corp.
$2,034,190,811
8.2%
Amazon.com, Inc.
$1,876,087,592
7.6%
Broadcom, Inc.
$1,461,465,015
5.9%
Meta Platforms, Inc. - Class A
$1,356,408,299
5.5%
Visa, Inc. - Class A
$918,923,452
3.7%
Eli Lilly & Co.
$774,809,131
3.1%
Netflix, Inc.
$640,943,546
2.5%
Taiwan Semiconductor Manufacturing Co., Ltd. (Sponsored ADR)
$556,076,957
2.2%
Total
$14,615,872,730
58.8%
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 semi-annual shareholder report contains important information about the AB Large Cap Growth Fund (the “Fund”) for the period of August 1, 2025 to January 31, 2026.
Additional Information [Text Block] Fund
Additional Information Phone Number (800) 227 4618
Additional Information Website https://www.abfunds.com/link/AB/APGAX-S
Expenses [Text Block]

What were the Fund costs for the last six months?

(Based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$40
0.79%Footnote Reference*
Footnote Description
Footnote*
 Annualized
Expenses Paid, Amount $ 40
Expense Ratio, Percent 0.79% [2]
AssetsNet $ 24,842,758,822
Holdings Count | Holding 61
Advisory Fees Paid, Amount $ 63,443,240
InvestmentCompanyPortfolioTurnover 17.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Net Assets
$24,842,758,822
# of Portfolio Holdings
61
Portfolio Turnover Rate
17%
Total Advisory Fees Paid (Net)
$63,443,240
Holdings [Text Block]

Sector Breakdown (% of Net Assets)

Table Summary
Information Technology
37.4%
Communication Services
18.1%
Consumer Discretionary
14.3%
Health Care
13.4%
Financials
5.6%
Consumer Staples
5.0%
Industrials
3.9%
Materials
1.2%
Short-Term Investments
1.2%
Other assets less liabilities
-0.1%
Total
100.0%
Largest Holdings [Text Block]

10 Top Holdings

Table Summary
Company
U.S. $ Value
% of Net Assets
NVIDIA Corp.
$2,637,688,036
10.6%
Alphabet, Inc. - Class C
$2,359,279,891
9.5%
Microsoft Corp.
$2,034,190,811
8.2%
Amazon.com, Inc.
$1,876,087,592
7.6%
Broadcom, Inc.
$1,461,465,015
5.9%
Meta Platforms, Inc. - Class A
$1,356,408,299
5.5%
Visa, Inc. - Class A
$918,923,452
3.7%
Eli Lilly & Co.
$774,809,131
3.1%
Netflix, Inc.
$640,943,546
2.5%
Taiwan Semiconductor Manufacturing Co., Ltd. (Sponsored ADR)
$556,076,957
2.2%
Total
$14,615,872,730
58.8%
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 semi-annual shareholder report contains important information about the AB Large Cap Growth Fund (the “Fund”) for the period of August 1, 2025 to January 31, 2026.
Additional Information [Text Block] Fund
Material Fund Change Notice [Text Block] This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number (800) 227 4618
Additional Information Website https://www.abfunds.com/link/AB/APGCX-S
Expenses [Text Block]

What were the Fund costs for the last six months?

(Based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$79
1.54%Footnote Reference*
Footnote Description
Footnote*
 Annualized
Expenses Paid, Amount $ 79
Expense Ratio, Percent 1.54% [3]
AssetsNet $ 24,842,758,822
Holdings Count | Holding 61
Advisory Fees Paid, Amount $ 63,443,240
InvestmentCompanyPortfolioTurnover 17.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Net Assets
$24,842,758,822
# of Portfolio Holdings
61
Portfolio Turnover Rate
17%
Total Advisory Fees Paid (Net)
$63,443,240
Holdings [Text Block]

Sector Breakdown (% of Net Assets)

Table Summary
Information Technology
37.4%
Communication Services
18.1%
Consumer Discretionary
14.3%
Health Care
13.4%
Financials
5.6%
Consumer Staples
5.0%
Industrials
3.9%
Materials
1.2%
Short-Term Investments
1.2%
Other assets less liabilities
-0.1%
Total
100.0%
Largest Holdings [Text Block]

10 Top Holdings

Table Summary
Company
U.S. $ Value
% of Net Assets
NVIDIA Corp.
$2,637,688,036
10.6%
Alphabet, Inc. - Class C
$2,359,279,891
9.5%
Microsoft Corp.
$2,034,190,811
8.2%
Amazon.com, Inc.
$1,876,087,592
7.6%
Broadcom, Inc.
$1,461,465,015
5.9%
Meta Platforms, Inc. - Class A
$1,356,408,299
5.5%
Visa, Inc. - Class A
$918,923,452
3.7%
Eli Lilly & Co.
$774,809,131
3.1%
Netflix, Inc.
$640,943,546
2.5%
Taiwan Semiconductor Manufacturing Co., Ltd. (Sponsored ADR)
$556,076,957
2.2%
Total
$14,615,872,730
58.8%
Summary of Change Legend [Text Block]

This is a summary of certain changes to the Fund during the reporting period.
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 semi-annual shareholder report contains important information about the AB Large Cap Growth Fund (the “Fund”) for the period of August 1, 2025 to January 31, 2026.
Additional Information [Text Block] Fund
Additional Information Phone Number (800) 227 4618
Additional Information Website https://www.abfunds.com/link/AB/ALLIX-S
Expenses [Text Block]

What were the Fund costs for the last six months?

(Based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I
$31
0.60%Footnote Reference*
Footnote Description
Footnote*
 Annualized
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.60% [4]
AssetsNet $ 24,842,758,822
Holdings Count | Holding 61
Advisory Fees Paid, Amount $ 63,443,240
InvestmentCompanyPortfolioTurnover 17.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Net Assets
$24,842,758,822
# of Portfolio Holdings
61
Portfolio Turnover Rate
17%
Total Advisory Fees Paid (Net)
$63,443,240
Holdings [Text Block]

Sector Breakdown (% of Net Assets)

Table Summary
Information Technology
37.4%
Communication Services
18.1%
Consumer Discretionary
14.3%
Health Care
13.4%
Financials
5.6%
Consumer Staples
5.0%
Industrials
3.9%
Materials
1.2%
Short-Term Investments
1.2%
Other assets less liabilities
-0.1%
Total
100.0%
Largest Holdings [Text Block]

10 Top Holdings

Table Summary
Company
U.S. $ Value
% of Net Assets
NVIDIA Corp.
$2,637,688,036
10.6%
Alphabet, Inc. - Class C
$2,359,279,891
9.5%
Microsoft Corp.
$2,034,190,811
8.2%
Amazon.com, Inc.
$1,876,087,592
7.6%
Broadcom, Inc.
$1,461,465,015
5.9%
Meta Platforms, Inc. - Class A
$1,356,408,299
5.5%
Visa, Inc. - Class A
$918,923,452
3.7%
Eli Lilly & Co.
$774,809,131
3.1%
Netflix, Inc.
$640,943,546
2.5%
Taiwan Semiconductor Manufacturing Co., Ltd. (Sponsored ADR)
$556,076,957
2.2%
Total
$14,615,872,730
58.8%
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 semi-annual shareholder report contains important information about the AB Large Cap Growth Fund (the “Fund”) for the period of August 1, 2025 to January 31, 2026.
Additional Information [Text Block] Fund
Additional Information Phone Number (800) 227 4618
Additional Information Website https://www.abfunds.com/link/AB/APGZX-S
Expenses [Text Block]

What were the Fund costs for the last six months?

(Based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class Z
$26
0.50%Footnote Reference*
Footnote Description
Footnote*
 Annualized
Expenses Paid, Amount $ 26
Expense Ratio, Percent 0.50% [5]
AssetsNet $ 24,842,758,822
Holdings Count | Holding 61
Advisory Fees Paid, Amount $ 63,443,240
InvestmentCompanyPortfolioTurnover 17.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Net Assets
$24,842,758,822
# of Portfolio Holdings
61
Portfolio Turnover Rate
17%
Total Advisory Fees Paid (Net)
$63,443,240
Holdings [Text Block]

Sector Breakdown (% of Net Assets)

Table Summary
Information Technology
37.4%
Communication Services
18.1%
Consumer Discretionary
14.3%
Health Care
13.4%
Financials
5.6%
Consumer Staples
5.0%
Industrials
3.9%
Materials
1.2%
Short-Term Investments
1.2%
Other assets less liabilities
-0.1%
Total
100.0%
Largest Holdings [Text Block]

10 Top Holdings

Table Summary
Company
U.S. $ Value
% of Net Assets
NVIDIA Corp.
$2,637,688,036
10.6%
Alphabet, Inc. - Class C
$2,359,279,891
9.5%
Microsoft Corp.
$2,034,190,811
8.2%
Amazon.com, Inc.
$1,876,087,592
7.6%
Broadcom, Inc.
$1,461,465,015
5.9%
Meta Platforms, Inc. - Class A
$1,356,408,299
5.5%
Visa, Inc. - Class A
$918,923,452
3.7%
Eli Lilly & Co.
$774,809,131
3.1%
Netflix, Inc.
$640,943,546
2.5%
Taiwan Semiconductor Manufacturing Co., Ltd. (Sponsored ADR)
$556,076,957
2.2%
Total
$14,615,872,730
58.8%
[1] Annualized
[2] Annualized
[3] Annualized
[4] Annualized
[5] Annualized