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Shareholder Report
 6 Months Ended
Oct. 31, 2024
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name AB FIXED INCOME SHARES INC
Entity Central Index Key 0000862021
Entity Investment Company Type N-1A
Document Period End Date Oct. 31, 2024
C000172512  
Shareholder Report [Line Items]  
Fund Name AB Government Money Market Portfolio
Class Name Advisor Class
Trading Symbol AEYXX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the AB Government Money Market Portfolio (the “Portfolio”) for the period of May 1, 2024 to October 31, 2024.
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/AEYXX-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/AEYXX-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
$11
0.21%
Expenses Paid, Amount $ 11
Expense Ratio, Percent 0.21%
AssetsNet $ 23,198,652,542
Holdings Count | Holding 87
Advisory Fees Paid, Amount $ 19,129,387
InvestmentCompanyPortfolioTurnover 0.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

FUND STATISTICS
Fund Stats
Net Assets
$23,198,652,542
# of Portfolio Holdings
87
Portfolio Turnover Rate
0%
Total Advisory Fees Paid
$19,129,387
Material Fund Change [Text Block]

Material Fund Changes 

This is a summary of certain changes to the Fund during the reporting period.

AllianceBernstein L.P., the Adviser, discontinued a contractual agreement to waive 0.05% of the Portfolio's management fee upon the expiration of the term of the agreement on August 31, 2024. Effective September 1, 2024, the contractual management fee for the Portfolio is 0.20% of net assets.
Material Fund Change Expenses [Text Block]

AllianceBernstein L.P., the Adviser, discontinued a contractual agreement to waive 0.05% of the Portfolio's management fee upon the expiration of the term of the agreement on August 31, 2024. Effective September 1, 2024, the contractual management fee for the Portfolio is 0.20% of net assets.
Summary of Change Legend [Text Block]

This is a summary of certain changes to the Fund during the reporting period.
C000172513  
Shareholder Report [Line Items]  
Fund Name AB Government Money Market Portfolio
Class Name Class 1
Trading Symbol AGRXX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the AB Government Money Market Portfolio (the “Portfolio”) for the period of May 1, 2024 to October 31, 2024.
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/AGRXX-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/AGRXX-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 1
$14
0.27%
Expenses Paid, Amount $ 14
Expense Ratio, Percent 0.27%
AssetsNet $ 23,198,652,542
Holdings Count | Holding 87
Advisory Fees Paid, Amount $ 19,129,387
InvestmentCompanyPortfolioTurnover 0.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

FUND STATISTICS
Fund Stats
Net Assets
$23,198,652,542
# of Portfolio Holdings
87
Portfolio Turnover Rate
0%
Total Advisory Fees Paid
$19,129,387
Material Fund Change [Text Block]

Material Fund Changes 

This is a summary of certain changes to the Fund during the reporting period.

AllianceBernstein L.P., the Adviser, discontinued a contractual agreement to waive 0.05% of the Portfolio's management fee upon the expiration of the term of the agreement on August 31, 2024. Effective September 1, 2024, the contractual management fee for the Portfolio is 0.20% of net assets.
Material Fund Change Expenses [Text Block]

AllianceBernstein L.P., the Adviser, discontinued a contractual agreement to waive 0.05% of the Portfolio's management fee upon the expiration of the term of the agreement on August 31, 2024. Effective September 1, 2024, the contractual management fee for the Portfolio is 0.20% of net assets.
Summary of Change Legend [Text Block]

This is a summary of certain changes to the Fund during the reporting period.
C000172514  
Shareholder Report [Line Items]  
Fund Name AB Government Money Market Portfolio
Class Name Class A
Trading Symbol AEAXX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the AB Government Money Market Portfolio (the “Portfolio”) for the period of May 1, 2024 to October 31, 2024.
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/AEAXX-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/AEAXX-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
$11
0.21%
Expenses Paid, Amount $ 11
Expense Ratio, Percent 0.21%
AssetsNet $ 23,198,652,542
Holdings Count | Holding 87
Advisory Fees Paid, Amount $ 19,129,387
InvestmentCompanyPortfolioTurnover 0.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

FUND STATISTICS
Fund Stats
Net Assets
$23,198,652,542
# of Portfolio Holdings
87
Portfolio Turnover Rate
0%
Total Advisory Fees Paid
$19,129,387
Material Fund Change [Text Block]

Material Fund Changes 

This is a summary of certain changes to the Fund during the reporting period.

AllianceBernstein L.P., the Adviser, discontinued a contractual agreement to waive 0.05% of the Portfolio's management fee upon the expiration of the term of the agreement on August 31, 2024. Effective September 1, 2024, the contractual management fee for the Portfolio is 0.20% of net assets.
Material Fund Change Expenses [Text Block]

AllianceBernstein L.P., the Adviser, discontinued a contractual agreement to waive 0.05% of the Portfolio's management fee upon the expiration of the term of the agreement on August 31, 2024. Effective September 1, 2024, the contractual management fee for the Portfolio is 0.20% of net assets.
Summary of Change Legend [Text Block]

This is a summary of certain changes to the Fund during the reporting period.
C000032709  
Shareholder Report [Line Items]  
Fund Name AB Government Money Market Portfolio
Class Name Class AB
Trading Symbol MYMXX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the AB Government Money Market Portfolio (the “Portfolio”) for the period of May 1, 2024 to October 31, 2024.
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/MYMXX-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/MYMXX-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 AB
$9
0.18%
Expenses Paid, Amount $ 9
Expense Ratio, Percent 0.18%
AssetsNet $ 23,198,652,542
Holdings Count | Holding 87
Advisory Fees Paid, Amount $ 19,129,387
InvestmentCompanyPortfolioTurnover 0.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

FUND STATISTICS
Fund Stats
Net Assets
$23,198,652,542
# of Portfolio Holdings
87
Portfolio Turnover Rate
0%
Total Advisory Fees Paid
$19,129,387
Material Fund Change [Text Block]

Material Fund Changes 

This is a summary of certain changes to the Fund during the reporting period.

AllianceBernstein L.P., the Adviser, discontinued a contractual agreement to waive 0.05% of the Portfolio's management fee upon the expiration of the term of the agreement on August 31, 2024. Effective September 1, 2024, the contractual management fee for the Portfolio is 0.20% of net assets.
Material Fund Change Expenses [Text Block]

AllianceBernstein L.P., the Adviser, discontinued a contractual agreement to waive 0.05% of the Portfolio's management fee upon the expiration of the term of the agreement on August 31, 2024. Effective September 1, 2024, the contractual management fee for the Portfolio is 0.20% of net assets.
Summary of Change Legend [Text Block]

This is a summary of certain changes to the Fund during the reporting period.
C000172515  
Shareholder Report [Line Items]  
Fund Name AB Government Money Market Portfolio
Class Name Class C
Trading Symbol AECXX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the AB Government Money Market Portfolio (the “Portfolio”) for the period of May 1, 2024 to October 31, 2024.
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/AECXX-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/AECXX-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 C
$11
0.21%
Expenses Paid, Amount $ 11
Expense Ratio, Percent 0.21%
AssetsNet $ 23,198,652,542
Holdings Count | Holding 87
Advisory Fees Paid, Amount $ 19,129,387
InvestmentCompanyPortfolioTurnover 0.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

FUND STATISTICS
Fund Stats
Net Assets
$23,198,652,542
# of Portfolio Holdings
87
Portfolio Turnover Rate
0%
Total Advisory Fees Paid
$19,129,387
Material Fund Change [Text Block]

Material Fund Changes 

This is a summary of certain changes to the Fund during the reporting period.

AllianceBernstein L.P., the Adviser, discontinued a contractual agreement to waive 0.05% of the Portfolio's management fee upon the expiration of the term of the agreement on August 31, 2024. Effective September 1, 2024, the contractual management fee for the Portfolio is 0.20% of net assets.
Material Fund Change Expenses [Text Block]

AllianceBernstein L.P., the Adviser, discontinued a contractual agreement to waive 0.05% of the Portfolio's management fee upon the expiration of the term of the agreement on August 31, 2024. Effective September 1, 2024, the contractual management fee for the Portfolio is 0.20% of net assets.
Summary of Change Legend [Text Block]

This is a summary of certain changes to the Fund during the reporting period.
C000172516  
Shareholder Report [Line Items]  
Fund Name AB Government Money Market Portfolio
Class Name Class I
Trading Symbol AIEXX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the AB Government Money Market Portfolio (the “Portfolio”) for the period of May 1, 2024 to October 31, 2024.
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/AIEXX-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/AIEXX-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 I
$10
0.20%
Expenses Paid, Amount $ 10
Expense Ratio, Percent 0.20%
AssetsNet $ 23,198,652,542
Holdings Count | Holding 87
Advisory Fees Paid, Amount $ 19,129,387
InvestmentCompanyPortfolioTurnover 0.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

FUND STATISTICS
Fund Stats
Net Assets
$23,198,652,542
# of Portfolio Holdings
87
Portfolio Turnover Rate
0%
Total Advisory Fees Paid
$19,129,387
Material Fund Change [Text Block]

Material Fund Changes 

This is a summary of certain changes to the Fund during the reporting period.

AllianceBernstein L.P., the Adviser, discontinued a contractual agreement to waive 0.05% of the Portfolio's management fee upon the expiration of the term of the agreement on August 31, 2024. Effective September 1, 2024, the contractual management fee for the Portfolio is 0.20% of net assets.
Material Fund Change Expenses [Text Block]

AllianceBernstein L.P., the Adviser, discontinued a contractual agreement to waive 0.05% of the Portfolio's management fee upon the expiration of the term of the agreement on August 31, 2024. Effective September 1, 2024, the contractual management fee for the Portfolio is 0.20% of net assets.
Summary of Change Legend [Text Block]

This is a summary of certain changes to the Fund during the reporting period.
C000172520  
Shareholder Report [Line Items]  
Fund Name AB Government Money Market Portfolio
Class Name Institutional Class
Trading Symbol GMOXX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the AB Government Money Market Portfolio (the “Portfolio”) for the period of May 1, 2024 to October 31, 2024.
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/GMOXX-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/GMOXX-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
Institutional Class
$9
0.18%
Expenses Paid, Amount $ 9
Expense Ratio, Percent 0.18%
AssetsNet $ 23,198,652,542
Holdings Count | Holding 87
Advisory Fees Paid, Amount $ 19,129,387
InvestmentCompanyPortfolioTurnover 0.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

FUND STATISTICS
Fund Stats
Net Assets
$23,198,652,542
# of Portfolio Holdings
87
Portfolio Turnover Rate
0%
Total Advisory Fees Paid
$19,129,387
Material Fund Change [Text Block]

Material Fund Changes 

This is a summary of certain changes to the Fund during the reporting period.

AllianceBernstein L.P., the Adviser, discontinued a contractual agreement to waive 0.05% of the Portfolio's management fee upon the expiration of the term of the agreement on August 31, 2024. Effective September 1, 2024, the contractual management fee for the Portfolio is 0.20% of net assets.
Material Fund Change Expenses [Text Block]

AllianceBernstein L.P., the Adviser, discontinued a contractual agreement to waive 0.05% of the Portfolio's management fee upon the expiration of the term of the agreement on August 31, 2024. Effective September 1, 2024, the contractual management fee for the Portfolio is 0.20% of net assets.
Summary of Change Legend [Text Block]

This is a summary of certain changes to the Fund during the reporting period.