v3.26.1
Shareholder Report
6 Months Ended
Apr. 30, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name AB RELATIVE VALUE FUND, INC.
Entity Central Index Key 0000029292
Entity Investment Company Type N-1A
Document Period End Date Apr. 30, 2026
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
C000027914  
Shareholder Report [Line Items]  
Fund Name AB Relative Value Fund
Class Name Advisor Class
Trading Symbol CBBYX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the AB Relative Value Fund (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] Fund
Additional Information Phone Number (800) 227 4618
Additional Information Website https://www.abfunds.com/link/AB/CBBYX-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
$34
0.65%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.65% [1]
AssetsNet $ 1,861,287,118
Holdings Count | Holding 76
Advisory Fees Paid, Amount $ 4,633,043
InvestmentCompanyPortfolioTurnover 25.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Net Assets
$1,861,287,118
# of Portfolio Holdings
76
Portfolio Turnover Rate
25%
Total Advisory Fees Paid (Net)
$4,633,043
Holdings [Text Block]

Sector Breakdown (% of Net Assets)

Table Summary
Financials
17.0%
Industrials
16.5%
Health Care
13.9%
Information Technology
12.8%
Consumer Staples
8.4%
Energy
8.1%
Communication Services
7.8%
Consumer Discretionary
7.3%
Materials
2.0%
Real Estate
1.5%
Others
0.7%
Short-Term Investments
3.1%
Other assets less liabilities
0.9%
Total
100.0%
Largest Holdings [Text Block]

10 Top Holdings

Table Summary
Company
U.S. $ Value
% of Net Assets
Berkshire Hathaway, Inc. - Class B
$72,863,834
3.9%
JPMorgan Chase & Co.
$64,367,825
3.5%
RTX Corp.
$60,952,617
3.3%
Alphabet, Inc. - Class C
$60,503,115
3.2%
Johnson & Johnson
$59,638,260
3.2%
Philip Morris International, Inc.
$52,312,003
2.8%
Cisco Systems, Inc.
$50,465,910
2.7%
Texas Instruments, Inc.
$46,648,037
2.5%
UnitedHealth Group, Inc.
$44,109,349
2.4%
Chevron Corp.
$42,371,812
2.3%
Total
$554,232,762
29.8%
Material Fund Change [Text Block]
C000027911  
Shareholder Report [Line Items]  
Fund Name AB Relative Value Fund
Class Name Class A
Trading Symbol CABDX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the AB Relative Value Fund (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] Fund
Additional Information Phone Number (800) 227 4618
Additional Information Website https://www.abfunds.com/link/AB/CABDX-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
$47
0.90%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 47
Expense Ratio, Percent 0.90% [2]
AssetsNet $ 1,861,287,118
Holdings Count | Holding 76
Advisory Fees Paid, Amount $ 4,633,043
InvestmentCompanyPortfolioTurnover 25.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Net Assets
$1,861,287,118
# of Portfolio Holdings
76
Portfolio Turnover Rate
25%
Total Advisory Fees Paid (Net)
$4,633,043
Holdings [Text Block]

Sector Breakdown (% of Net Assets)

Table Summary
Financials
17.0%
Industrials
16.5%
Health Care
13.9%
Information Technology
12.8%
Consumer Staples
8.4%
Energy
8.1%
Communication Services
7.8%
Consumer Discretionary
7.3%
Materials
2.0%
Real Estate
1.5%
Others
0.7%
Short-Term Investments
3.1%
Other assets less liabilities
0.9%
Total
100.0%
Largest Holdings [Text Block]

10 Top Holdings

Table Summary
Company
U.S. $ Value
% of Net Assets
Berkshire Hathaway, Inc. - Class B
$72,863,834
3.9%
JPMorgan Chase & Co.
$64,367,825
3.5%
RTX Corp.
$60,952,617
3.3%
Alphabet, Inc. - Class C
$60,503,115
3.2%
Johnson & Johnson
$59,638,260
3.2%
Philip Morris International, Inc.
$52,312,003
2.8%
Cisco Systems, Inc.
$50,465,910
2.7%
Texas Instruments, Inc.
$46,648,037
2.5%
UnitedHealth Group, Inc.
$44,109,349
2.4%
Chevron Corp.
$42,371,812
2.3%
Total
$554,232,762
29.8%
Material Fund Change [Text Block]
C000027913  
Shareholder Report [Line Items]  
Fund Name AB Relative Value Fund
Class Name Class C
Trading Symbol CBBCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the AB Relative Value Fund (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] Fund
Additional Information Phone Number (800) 227 4618
Additional Information Website https://www.abfunds.com/link/AB/CBBCX-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
$87
1.65%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 87
Expense Ratio, Percent 1.65% [3]
AssetsNet $ 1,861,287,118
Holdings Count | Holding 76
Advisory Fees Paid, Amount $ 4,633,043
InvestmentCompanyPortfolioTurnover 25.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Net Assets
$1,861,287,118
# of Portfolio Holdings
76
Portfolio Turnover Rate
25%
Total Advisory Fees Paid (Net)
$4,633,043
Holdings [Text Block]

Sector Breakdown (% of Net Assets)

Table Summary
Financials
17.0%
Industrials
16.5%
Health Care
13.9%
Information Technology
12.8%
Consumer Staples
8.4%
Energy
8.1%
Communication Services
7.8%
Consumer Discretionary
7.3%
Materials
2.0%
Real Estate
1.5%
Others
0.7%
Short-Term Investments
3.1%
Other assets less liabilities
0.9%
Total
100.0%
Largest Holdings [Text Block]

10 Top Holdings

Table Summary
Company
U.S. $ Value
% of Net Assets
Berkshire Hathaway, Inc. - Class B
$72,863,834
3.9%
JPMorgan Chase & Co.
$64,367,825
3.5%
RTX Corp.
$60,952,617
3.3%
Alphabet, Inc. - Class C
$60,503,115
3.2%
Johnson & Johnson
$59,638,260
3.2%
Philip Morris International, Inc.
$52,312,003
2.8%
Cisco Systems, Inc.
$50,465,910
2.7%
Texas Instruments, Inc.
$46,648,037
2.5%
UnitedHealth Group, Inc.
$44,109,349
2.4%
Chevron Corp.
$42,371,812
2.3%
Total
$554,232,762
29.8%
Material Fund Change [Text Block]
C000027917  
Shareholder Report [Line Items]  
Fund Name AB Relative Value Fund
Class Name Class I
Trading Symbol CBBIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the AB Relative Value Fund (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] Fund
Additional Information Phone Number (800) 227 4618
Additional Information Website https://www.abfunds.com/link/AB/CBBIX-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
$34
0.65%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.65% [4]
AssetsNet $ 1,861,287,118
Holdings Count | Holding 76
Advisory Fees Paid, Amount $ 4,633,043
InvestmentCompanyPortfolioTurnover 25.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Net Assets
$1,861,287,118
# of Portfolio Holdings
76
Portfolio Turnover Rate
25%
Total Advisory Fees Paid (Net)
$4,633,043
Holdings [Text Block]

Sector Breakdown (% of Net Assets)

Table Summary
Financials
17.0%
Industrials
16.5%
Health Care
13.9%
Information Technology
12.8%
Consumer Staples
8.4%
Energy
8.1%
Communication Services
7.8%
Consumer Discretionary
7.3%
Materials
2.0%
Real Estate
1.5%
Others
0.7%
Short-Term Investments
3.1%
Other assets less liabilities
0.9%
Total
100.0%
Largest Holdings [Text Block]

10 Top Holdings

Table Summary
Company
U.S. $ Value
% of Net Assets
Berkshire Hathaway, Inc. - Class B
$72,863,834
3.9%
JPMorgan Chase & Co.
$64,367,825
3.5%
RTX Corp.
$60,952,617
3.3%
Alphabet, Inc. - Class C
$60,503,115
3.2%
Johnson & Johnson
$59,638,260
3.2%
Philip Morris International, Inc.
$52,312,003
2.8%
Cisco Systems, Inc.
$50,465,910
2.7%
Texas Instruments, Inc.
$46,648,037
2.5%
UnitedHealth Group, Inc.
$44,109,349
2.4%
Chevron Corp.
$42,371,812
2.3%
Total
$554,232,762
29.8%
Material Fund Change [Text Block]
C000132087  
Shareholder Report [Line Items]  
Fund Name AB Relative Value Fund
Class Name Class Z
Trading Symbol CBBZX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the AB Relative Value Fund (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] Fund
Additional Information Phone Number (800) 227 4618
Additional Information Website https://www.abfunds.com/link/AB/CBBZX-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
$32
0.61%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.61% [5]
AssetsNet $ 1,861,287,118
Holdings Count | Holding 76
Advisory Fees Paid, Amount $ 4,633,043
InvestmentCompanyPortfolioTurnover 25.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Net Assets
$1,861,287,118
# of Portfolio Holdings
76
Portfolio Turnover Rate
25%
Total Advisory Fees Paid (Net)
$4,633,043
Holdings [Text Block]

Sector Breakdown (% of Net Assets)

Table Summary
Financials
17.0%
Industrials
16.5%
Health Care
13.9%
Information Technology
12.8%
Consumer Staples
8.4%
Energy
8.1%
Communication Services
7.8%
Consumer Discretionary
7.3%
Materials
2.0%
Real Estate
1.5%
Others
0.7%
Short-Term Investments
3.1%
Other assets less liabilities
0.9%
Total
100.0%
Largest Holdings [Text Block]

10 Top Holdings

Table Summary
Company
U.S. $ Value
% of Net Assets
Berkshire Hathaway, Inc. - Class B
$72,863,834
3.9%
JPMorgan Chase & Co.
$64,367,825
3.5%
RTX Corp.
$60,952,617
3.3%
Alphabet, Inc. - Class C
$60,503,115
3.2%
Johnson & Johnson
$59,638,260
3.2%
Philip Morris International, Inc.
$52,312,003
2.8%
Cisco Systems, Inc.
$50,465,910
2.7%
Texas Instruments, Inc.
$46,648,037
2.5%
UnitedHealth Group, Inc.
$44,109,349
2.4%
Chevron Corp.
$42,371,812
2.3%
Total
$554,232,762
29.8%
Material Fund Change [Text Block]
[1] Annualized
[2] Annualized
[3] Annualized
[4] Annualized
[5] Annualized