Shareholder Report
|
12 Months Ended |
|
Apr. 30, 2026
USD ($)
Holding
|
|---|
| Shareholder Report [Line Items] |
|
| Document Type |
N-CSR
|
| 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 |
Apr. 30, 2026
|
| Shareholder Report Annual or Semi-Annual |
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 annual shareholder report contains important information about the AB Government Money Market Portfolio (the “Portfolio”) for the period of May 1, 2025 to April 30, 2026.
|
| Additional Information [Text Block] |
Portfolio
|
| Additional Information Phone Number |
(800) 227 4618
|
| Additional Information Website |
https://www.abfunds.com/link/AB/AEYXX-A
|
| Expenses [Text Block] |
What were the Portfolio costs for the last year?(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 |
$24 |
0.24% | |
| Expenses Paid, Amount |
$ 24
|
| Expense Ratio, Percent |
0.24%
|
| AssetsNet |
$ 24,828,887,376
|
| Holdings Count | Holding |
340
|
| Advisory Fees Paid, Amount |
$ 27,962,347
|
| Additional Fund Statistics [Text Block] |
Table Summary
Net Assets |
$24,828,887,376 |
# of Portfolio Holdings |
340 |
Total Advisory Fees Paid (Net) |
$27,962,347 | |
| Holdings [Text Block] |
Maturity Weightings (% of Total Investments)
Table Summary
1 - 7 Days |
43.2% |
8 - 30 Days |
2.3% |
31 - 60 Days |
4.9% |
61 - 90 Days |
10.8% |
91 - 180 Days |
19.1% |
Over 180 Days |
19.7% |
Total |
100.0% | |
| Material Fund Change [Text Block] |
|
| 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 annual shareholder report contains important information about the AB Government Money Market Portfolio (the “Portfolio”) for the period of May 1, 2025 to April 30, 2026.
|
| Additional Information [Text Block] |
Portfolio
|
| Additional Information Phone Number |
(800) 227 4618
|
| Additional Information Website |
https://www.abfunds.com/link/AB/AGRXX-A
|
| Expenses [Text Block] |
What were the Portfolio costs for the last year?(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 1 |
$32 |
0.31% | |
| Expenses Paid, Amount |
$ 32
|
| Expense Ratio, Percent |
0.31%
|
| AssetsNet |
$ 24,828,887,376
|
| Holdings Count | Holding |
340
|
| Advisory Fees Paid, Amount |
$ 27,962,347
|
| Additional Fund Statistics [Text Block] |
Table Summary
Net Assets |
$24,828,887,376 |
# of Portfolio Holdings |
340 |
Total Advisory Fees Paid (Net) |
$27,962,347 | |
| Holdings [Text Block] |
Maturity Weightings (% of Total Investments)
Table Summary
1 - 7 Days |
43.2% |
8 - 30 Days |
2.3% |
31 - 60 Days |
4.9% |
61 - 90 Days |
10.8% |
91 - 180 Days |
19.1% |
Over 180 Days |
19.7% |
Total |
100.0% | |
| Material Fund Change [Text Block] |
|
| 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 annual shareholder report contains important information about the AB Government Money Market Portfolio (the “Portfolio”) for the period of May 1, 2025 to April 30, 2026.
|
| Additional Information [Text Block] |
Portfolio
|
| Additional Information Phone Number |
(800) 227 4618
|
| Additional Information Website |
https://www.abfunds.com/link/AB/AEAXX-A
|
| Expenses [Text Block] |
What were the Portfolio costs for the last year?(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 |
$24 |
0.24% | |
| Expenses Paid, Amount |
$ 24
|
| Expense Ratio, Percent |
0.24%
|
| AssetsNet |
$ 24,828,887,376
|
| Holdings Count | Holding |
340
|
| Advisory Fees Paid, Amount |
$ 27,962,347
|
| Additional Fund Statistics [Text Block] |
Table Summary
Net Assets |
$24,828,887,376 |
# of Portfolio Holdings |
340 |
Total Advisory Fees Paid (Net) |
$27,962,347 | |
| Holdings [Text Block] |
Maturity Weightings (% of Total Investments)
Table Summary
1 - 7 Days |
43.2% |
8 - 30 Days |
2.3% |
31 - 60 Days |
4.9% |
61 - 90 Days |
10.8% |
91 - 180 Days |
19.1% |
Over 180 Days |
19.7% |
Total |
100.0% | |
| Material Fund Change [Text Block] |
|
| 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 annual shareholder report contains important information about the AB Government Money Market Portfolio (the “Portfolio”) for the period of May 1, 2025 to April 30, 2026.
|
| Additional Information [Text Block] |
Portfolio
|
| Additional Information Phone Number |
(800) 227 4618
|
| Additional Information Website |
https://www.abfunds.com/link/AB/MYMXX-A
|
| Expenses [Text Block] |
What were the Portfolio costs for the last year?(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 AB |
$21 |
0.21% | |
| Expenses Paid, Amount |
$ 21
|
| Expense Ratio, Percent |
0.21%
|
| AssetsNet |
$ 24,828,887,376
|
| Holdings Count | Holding |
340
|
| Advisory Fees Paid, Amount |
$ 27,962,347
|
| Additional Fund Statistics [Text Block] |
Table Summary
Net Assets |
$24,828,887,376 |
# of Portfolio Holdings |
340 |
Total Advisory Fees Paid (Net) |
$27,962,347 | |
| Holdings [Text Block] |
Maturity Weightings (% of Total Investments)
Table Summary
1 - 7 Days |
43.2% |
8 - 30 Days |
2.3% |
31 - 60 Days |
4.9% |
61 - 90 Days |
10.8% |
91 - 180 Days |
19.1% |
Over 180 Days |
19.7% |
Total |
100.0% | |
| Material Fund Change [Text Block] |
|
| 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 annual shareholder report contains important information about the AB Government Money Market Portfolio (the “Portfolio”) for the period of May 1, 2025 to April 30, 2026.
|
| Additional Information [Text Block] |
Portfolio
|
| Additional Information Phone Number |
(800) 227 4618
|
| Additional Information Website |
https://www.abfunds.com/link/AB/AECXX-A
|
| Expenses [Text Block] |
What were the Portfolio costs for the last year?(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 |
$24 |
0.24% | |
| Expenses Paid, Amount |
$ 24
|
| Expense Ratio, Percent |
0.24%
|
| AssetsNet |
$ 24,828,887,376
|
| Holdings Count | Holding |
340
|
| Advisory Fees Paid, Amount |
$ 27,962,347
|
| Additional Fund Statistics [Text Block] |
Table Summary
Net Assets |
$24,828,887,376 |
# of Portfolio Holdings |
340 |
Total Advisory Fees Paid (Net) |
$27,962,347 | |
| Holdings [Text Block] |
Maturity Weightings (% of Total Investments)
Table Summary
1 - 7 Days |
43.2% |
8 - 30 Days |
2.3% |
31 - 60 Days |
4.9% |
61 - 90 Days |
10.8% |
91 - 180 Days |
19.1% |
Over 180 Days |
19.7% |
Total |
100.0% | |
| Material Fund Change [Text Block] |
|
| 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 annual shareholder report contains important information about the AB Government Money Market Portfolio (the “Portfolio”) for the period of May 1, 2025 to April 30, 2026.
|
| Additional Information [Text Block] |
Portfolio
|
| Additional Information Phone Number |
(800) 227 4618
|
| Additional Information Website |
https://www.abfunds.com/link/AB/AIEXX-A
|
| Expenses [Text Block] |
What were the Portfolio costs for the last year?(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 |
$23 |
0.23% | |
| Expenses Paid, Amount |
$ 23
|
| Expense Ratio, Percent |
0.23%
|
| AssetsNet |
$ 24,828,887,376
|
| Holdings Count | Holding |
340
|
| Advisory Fees Paid, Amount |
$ 27,962,347
|
| Additional Fund Statistics [Text Block] |
Table Summary
Net Assets |
$24,828,887,376 |
# of Portfolio Holdings |
340 |
Total Advisory Fees Paid (Net) |
$27,962,347 | |
| Holdings [Text Block] |
Maturity Weightings (% of Total Investments)
Table Summary
1 - 7 Days |
43.2% |
8 - 30 Days |
2.3% |
31 - 60 Days |
4.9% |
61 - 90 Days |
10.8% |
91 - 180 Days |
19.1% |
Over 180 Days |
19.7% |
Total |
100.0% | |
| Material Fund Change [Text Block] |
|
| 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 annual shareholder report contains important information about the AB Government Money Market Portfolio (the “Portfolio”) for the period of May 1, 2025 to April 30, 2026.
|
| Additional Information [Text Block] |
Portfolio
|
| Additional Information Phone Number |
(800) 227 4618
|
| Additional Information Website |
https://www.abfunds.com/link/AB/GMOXX-A
|
| Expenses [Text Block] |
What were the Portfolio costs for the last year?(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 |
Institutional Class |
$22 |
0.21% | |
| Expenses Paid, Amount |
$ 22
|
| Expense Ratio, Percent |
0.21%
|
| AssetsNet |
$ 24,828,887,376
|
| Holdings Count | Holding |
340
|
| Advisory Fees Paid, Amount |
$ 27,962,347
|
| Additional Fund Statistics [Text Block] |
Table Summary
Net Assets |
$24,828,887,376 |
# of Portfolio Holdings |
340 |
Total Advisory Fees Paid (Net) |
$27,962,347 | |
| Holdings [Text Block] |
Maturity Weightings (% of Total Investments)
Table Summary
1 - 7 Days |
43.2% |
8 - 30 Days |
2.3% |
31 - 60 Days |
4.9% |
61 - 90 Days |
10.8% |
91 - 180 Days |
19.1% |
Over 180 Days |
19.7% |
Total |
100.0% | |
| Material Fund Change [Text Block] |
|