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Shareholder Report
 6 Months Ended
May 31, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name AB CAP FUND, INC.
Entity Central Index Key 0000081443
Entity Investment Company Type N-1A
Document Period End Date May 31, 2025
C000202617  
Shareholder Report [Line Items]  
Fund Name AB All China Equity Portfolio
Class Name Class A
Trading Symbol ACEAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the AB All China Equity Portfolio (the “Fund”) for the period of December 1, 2024 to May 31, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
Additional Information [Text Block] You can find additional information about the Fund at https://www.abfunds.com/link/AB/ACEAX-S. 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/ACEAX-S
Expenses [Text Block]

What were the Fund costs for the last six months?

(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
$78
1.50%Footnote Reference*
Footnote Description
Footnote*
 Annualized
Expenses Paid, Amount $ 78
Expense Ratio, Percent 1.50%
AssetsNet $ 47,251,160
Holdings Count | Holding 52
Advisory Fees Paid, Amount $ 116,609
InvestmentCompanyPortfolioTurnover 61.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$47,251,160
  • # of Portfolio Holdings52
  • Portfolio Turnover Rate61%
  • Total Advisory Fees Paid (Net)$116,609
Holdings [Text Block]

Sector Breakdown (% of Net Assets)

A graphical representation of Investments made.
Value
Value
Financials
24.0%
Consumer Discretionary
21.6%
Communication Services
17.4%
Information Technology
12.0%
Industrials
8.6%
Health Care
8.2%
Materials
4.1%
Consumer Staples
2.5%
Short-Term Investments
1.7%
Other Assets less Liabilities
-0.1%

Country Breakdown (% of Net Assets)

A graphical representation of Investments made.
Value
Value
China
98.4%
Short-Term Investments
1.7%
Other Assets less Liabilities
-0.1%
Largest Holdings [Text Block]

10 Top Holdings

Company
U.S. $ Value
% of Net Assets
Tencent Holdings Ltd. - Class H
$4,731,351
10.0%
Alibaba Group Holding Ltd. - Class H
$3,974,628
8.4%
Xiaomi Corp. - Class H
$2,564,505
5.4%
Qifu Technology, Inc. (ADR)
$2,103,087
4.5%
PICC Property & Casualty Co., Ltd. - Class H
$1,687,302
3.6%
BYD Co., Ltd. - Class H
$1,605,246
3.4%
NetEase, Inc. - Class H
$1,530,484
3.2%
Victory Giant Technology Huizhou Co., Ltd. - Class A
$1,354,996
2.9%
China Merchants Bank Co., Ltd. - Class H
$1,342,279
2.8%
Zhejiang Huayou Cobalt Co., Ltd. - Class A
$1,295,691
2.8%
Total
$22,189,569
47.0%
Material Fund Change [Text Block]
C000202616  
Shareholder Report [Line Items]  
Fund Name AB All China Equity Portfolio
Class Name Advisor Class
Trading Symbol ACEYX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the AB All China Equity Portfolio (the “Fund”) for the period of December 1, 2024 to May 31, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
Additional Information [Text Block] You can find additional information about the Fund at https://www.abfunds.com/link/AB/ACEYX-S. 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/ACEYX-S
Expenses [Text Block]

What were the Fund costs for the last six months?

(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
$65
1.25%Footnote Reference*
Footnote Description
Footnote*
 Annualized
Expenses Paid, Amount $ 65
Expense Ratio, Percent 1.25%
AssetsNet $ 47,251,160
Holdings Count | Holding 52
Advisory Fees Paid, Amount $ 116,609
InvestmentCompanyPortfolioTurnover 61.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$47,251,160
  • # of Portfolio Holdings52
  • Portfolio Turnover Rate61%
  • Total Advisory Fees Paid (Net)$116,609
Holdings [Text Block]

Sector Breakdown (% of Net Assets)

A graphical representation of Investments made.
Value
Value
Financials
24.0%
Consumer Discretionary
21.6%
Communication Services
17.4%
Information Technology
12.0%
Industrials
8.6%
Health Care
8.2%
Materials
4.1%
Consumer Staples
2.5%
Short-Term Investments
1.7%
Other Assets less Liabilities
-0.1%

Country Breakdown (% of Net Assets)

A graphical representation of Investments made.
Value
Value
China
98.4%
Short-Term Investments
1.7%
Other Assets less Liabilities
-0.1%
Largest Holdings [Text Block]

10 Top Holdings

Company
U.S. $ Value
% of Net Assets
Tencent Holdings Ltd. - Class H
$4,731,351
10.0%
Alibaba Group Holding Ltd. - Class H
$3,974,628
8.4%
Xiaomi Corp. - Class H
$2,564,505
5.4%
Qifu Technology, Inc. (ADR)
$2,103,087
4.5%
PICC Property & Casualty Co., Ltd. - Class H
$1,687,302
3.6%
BYD Co., Ltd. - Class H
$1,605,246
3.4%
NetEase, Inc. - Class H
$1,530,484
3.2%
Victory Giant Technology Huizhou Co., Ltd. - Class A
$1,354,996
2.9%
China Merchants Bank Co., Ltd. - Class H
$1,342,279
2.8%
Zhejiang Huayou Cobalt Co., Ltd. - Class A
$1,295,691
2.8%
Total
$22,189,569
47.0%
Material Fund Change [Text Block]