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Shareholder Report
 6 Months Ended
Oct. 31, 2025
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, 2025
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
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, 2025 to October 31, 2025.
Additional Information [Text Block] Portfolio
Additional Information Phone Number (800) 227 4618
Additional Information Website https://www.abfunds.com/link/AB/AEYXX-S
Expenses [Text Block]

What were the Portfolio 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
$12
0.23%Footnote Reference*
Footnote Description
Footnote*
 Annualized
Expenses Paid, Amount $ 12
Expense Ratio, Percent 0.23% [1]
AssetsNet $ 26,860,245,996
Holdings Count | Holding 80
Advisory Fees Paid, Amount $ 14,030,505
Additional Fund Statistics [Text Block]

Key Portfolio Statistics

Net Assets
$26,860,245,996
# of Portfolio Holdings
80
Total Advisory Fees Paid (Net)
$14,030,505
Holdings [Text Block]

Maturity Weightings (% of Total Investments)

1 - 7 Days
39.3%
8 - 30 Days
2.2%
31 - 60 Days
4.6%
61 - 90 Days
6.4%
91 - 180 Days
27.6%
Over 180 Days
19.9%
Total
100.0%
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, 2025 to October 31, 2025.
Additional Information [Text Block] Portfolio
Additional Information Phone Number (800) 227 4618
Additional Information Website https://www.abfunds.com/link/AB/AGRXX-S
Expenses [Text Block]

What were the Portfolio 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
$16
0.31%Footnote Reference*
Footnote Description
Footnote*
 Annualized
Expenses Paid, Amount $ 16
Expense Ratio, Percent 0.31% [2]
AssetsNet $ 26,860,245,996
Holdings Count | Holding 80
Advisory Fees Paid, Amount $ 14,030,505
Additional Fund Statistics [Text Block]

Key Portfolio Statistics

Net Assets
$26,860,245,996
# of Portfolio Holdings
80
Total Advisory Fees Paid (Net)
$14,030,505
Holdings [Text Block]

Maturity Weightings (% of Total Investments)

1 - 7 Days
39.3%
8 - 30 Days
2.2%
31 - 60 Days
4.6%
61 - 90 Days
6.4%
91 - 180 Days
27.6%
Over 180 Days
19.9%
Total
100.0%
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, 2025 to October 31, 2025.
Additional Information [Text Block] Portfolio
Additional Information Phone Number (800) 227 4618
Additional Information Website https://www.abfunds.com/link/AB/AEAXX-S
Expenses [Text Block]

What were the Portfolio 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
$12
0.23%Footnote Reference*
Footnote Description
Footnote*
 Annualized
Expenses Paid, Amount $ 12
Expense Ratio, Percent 0.23% [3]
AssetsNet $ 26,860,245,996
Holdings Count | Holding 80
Advisory Fees Paid, Amount $ 14,030,505
Additional Fund Statistics [Text Block]

Key Portfolio Statistics

Net Assets
$26,860,245,996
# of Portfolio Holdings
80
Total Advisory Fees Paid (Net)
$14,030,505
Holdings [Text Block]

Maturity Weightings (% of Total Investments)

1 - 7 Days
39.3%
8 - 30 Days
2.2%
31 - 60 Days
4.6%
61 - 90 Days
6.4%
91 - 180 Days
27.6%
Over 180 Days
19.9%
Total
100.0%
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, 2025 to October 31, 2025.
Additional Information [Text Block] Portfolio
Additional Information Phone Number (800) 227 4618
Additional Information Website https://www.abfunds.com/link/AB/MYMXX-S
Expenses [Text Block]

What were the Portfolio 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
$11
0.21%Footnote Reference*
Footnote Description
Footnote*
 Annualized
Expenses Paid, Amount $ 11
Expense Ratio, Percent 0.21% [4]
AssetsNet $ 26,860,245,996
Holdings Count | Holding 80
Advisory Fees Paid, Amount $ 14,030,505
Additional Fund Statistics [Text Block]

Key Portfolio Statistics

Net Assets
$26,860,245,996
# of Portfolio Holdings
80
Total Advisory Fees Paid (Net)
$14,030,505
Holdings [Text Block]

Maturity Weightings (% of Total Investments)

1 - 7 Days
39.3%
8 - 30 Days
2.2%
31 - 60 Days
4.6%
61 - 90 Days
6.4%
91 - 180 Days
27.6%
Over 180 Days
19.9%
Total
100.0%
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, 2025 to October 31, 2025.
Additional Information [Text Block] Portfolio
Additional Information Phone Number (800) 227 4618
Additional Information Website https://www.abfunds.com/link/AB/AECXX-S
Expenses [Text Block]

What were the Portfolio 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
$12
0.24%Footnote Reference*
Footnote Description
Footnote*
 Annualized
Expenses Paid, Amount $ 12
Expense Ratio, Percent 0.24% [5]
AssetsNet $ 26,860,245,996
Holdings Count | Holding 80
Advisory Fees Paid, Amount $ 14,030,505
Additional Fund Statistics [Text Block]

Key Portfolio Statistics

Net Assets
$26,860,245,996
# of Portfolio Holdings
80
Total Advisory Fees Paid (Net)
$14,030,505
Holdings [Text Block]

Maturity Weightings (% of Total Investments)

1 - 7 Days
39.3%
8 - 30 Days
2.2%
31 - 60 Days
4.6%
61 - 90 Days
6.4%
91 - 180 Days
27.6%
Over 180 Days
19.9%
Total
100.0%
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, 2025 to October 31, 2025.
Additional Information [Text Block] Portfolio
Additional Information Phone Number (800) 227 4618
Additional Information Website https://www.abfunds.com/link/AB/AIEXX-S
Expenses [Text Block]

What were the Portfolio 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
$12
0.23%Footnote Reference*
Footnote Description
Footnote*
 Annualized
Expenses Paid, Amount $ 12
Expense Ratio, Percent 0.23% [6]
AssetsNet $ 26,860,245,996
Holdings Count | Holding 80
Advisory Fees Paid, Amount $ 14,030,505
Additional Fund Statistics [Text Block]

Key Portfolio Statistics

Net Assets
$26,860,245,996
# of Portfolio Holdings
80
Total Advisory Fees Paid (Net)
$14,030,505
Holdings [Text Block]

Maturity Weightings (% of Total Investments)

1 - 7 Days
39.3%
8 - 30 Days
2.2%
31 - 60 Days
4.6%
61 - 90 Days
6.4%
91 - 180 Days
27.6%
Over 180 Days
19.9%
Total
100.0%
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, 2025 to October 31, 2025.
Additional Information [Text Block] Portfolio
Additional Information Phone Number (800) 227 4618
Additional Information Website https://www.abfunds.com/link/AB/GMOXX-S
Expenses [Text Block]

What were the Portfolio 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
$10
0.20%Footnote Reference*
Footnote Description
Footnote*
 Annualized
Expenses Paid, Amount $ 10
Expense Ratio, Percent 0.20% [7]
AssetsNet $ 26,860,245,996
Holdings Count | Holding 80
Advisory Fees Paid, Amount $ 14,030,505
Additional Fund Statistics [Text Block]

Key Portfolio Statistics

Net Assets
$26,860,245,996
# of Portfolio Holdings
80
Total Advisory Fees Paid (Net)
$14,030,505
Holdings [Text Block]

Maturity Weightings (% of Total Investments)

1 - 7 Days
39.3%
8 - 30 Days
2.2%
31 - 60 Days
4.6%
61 - 90 Days
6.4%
91 - 180 Days
27.6%
Over 180 Days
19.9%
Total
100.0%
[1] Annualized
[2] Annualized
[3] Annualized
[4] Annualized
[5] Annualized
[6] Annualized
[7] Annualized