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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName AB FIXED INCOME SHARES INC
Prospectus Date rr_ProspectusDate Aug. 31, 2017
Supplement [Text Block] abfis_SupplementTextBlock
AB FIXED-INCOME SHARES, INC.

-AB Government Money Market Portfolio

 

Supplement dated August 1, 2018 to the Prospectus dated August 31, 2017, as revised November 13, 2017, and the Summary Prospectus dated November 13, 2017 (the “Prospectuses”) of AB Government Money Market Portfolio (the “Portfolio”).

 

* * *

 

The Adviser has agreed to waive a portion of the management fee effective August 1, 2018. The following replaces the “Annual Portfolio Operating Expenses” table and related footnotes and the “Examples” section in the Portfolio’s Prospectuses under the heading “Fees and Expenses of the Portfolio.”

 

Annual Portfolio Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

 

   Class A  Class B  Class C  Advisor
Class		  Class K  Class I  Class 1  Class AB  Institutional
Class
Management Fees  .20%  .20%  .20%  .20%  .20%  .20%  .20%  .20%  .20%
Fee Waiver  (.10)%  (.10)%  (.10)%  (.10)%  (.10)%  (.10)%  (.10)%  (.10)%  (.10)%
Net Management
Fees (e)		  .10%  .10%  .10%  .10%  .10%  .10%  .10%  .10%  .10%
Distribution and/or Service
(12b-1) Fees		  .25%  1.00%  .75%  None   .25%  None  .10%  None   None
Other Expenses:                                    
Transfer Agent  .17%  .22%  .18%  .17%  .10%  .02%  .00%(f)  .00%(f)  .00%(f)
Other Expenses  .02%  .02%  .02%  .02%  .02%  .02%  .02%  .02%  .02%
                                     
Total Other Expenses  .19%  .24%  .20%  .19%  .12%  .04%  .02%  .02%  .02%
                                     
Total Annual Portfolio
Operating Expenses(g)		  .54%  1.34%  1.05%  .29%  .47%  .14%  .22%  .12%  .12%
                                     

 

  (e) The Management Fee is .20% of the Portfolio’s average daily net assets. The Adviser has contractually agreed to waive .10% of the Management Fee until August 31, 2019.
  (f) Amount is equal to less than .005%.
  (g) Total Annual Portfolio Operating Expenses are restated to reflect current fees.

 

 
 

 Examples

The Examples are intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your Portfolio shares at the end of those periods. The Examples also assume that your investment has a 5% return each year, that the Portfolio’s operating expenses stay the same and that any fee waiver is in effect for only the first year. Although your actual costs may be higher or lower, based on these assumptions your costs would be: 

 

   Class A  Class B  Class C  Advisor
Class		  Class K  Class I  Class 1  Class AB  Institutional
Class
After 1 Year  $55   $536   $207   $30   $48   $14   $24   $12   $12 
After 3 Years  $195   $646   $355   $115   $173   $67   $96   $61   $61 
After 5 Years  $347   $777   $623   $209   $308   $125   $175   $114   $114 
After 10 Years  $789   $1,497   $1,389   $483   $704   $296   $408   $270   $270 

 

For the share classes listed below, you would pay the following expenses if you did not redeem your shares at the end of the period:

 

   Class B  Class C
After 1 Year  $136   $107 
After 3 Years  $446   $355 
After 5 Years  $777   $623 
After 10 Years  $1,497   $1,389 

 

 

* * *
AB Government Money Market Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] abfis_SupplementTextBlock
AB FIXED-INCOME SHARES, INC.

-AB Government Money Market Portfolio

 

Supplement dated August 1, 2018 to the Prospectus dated August 31, 2017, as revised November 13, 2017, and the Summary Prospectus dated November 13, 2017 (the “Prospectuses”) of AB Government Money Market Portfolio (the “Portfolio”).

 

* * *

 

The Adviser has agreed to waive a portion of the management fee effective August 1, 2018. The following replaces the “Annual Portfolio Operating Expenses” table and related footnotes and the “Examples” section in the Portfolio’s Prospectuses under the heading “Fees and Expenses of the Portfolio.”

 

Annual Portfolio Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

 

   Class A  Class B  Class C  Advisor
Class		  Class K  Class I  Class 1  Class AB  Institutional
Class
Management Fees  .20%  .20%  .20%  .20%  .20%  .20%  .20%  .20%  .20%
Fee Waiver  (.10)%  (.10)%  (.10)%  (.10)%  (.10)%  (.10)%  (.10)%  (.10)%  (.10)%
Net Management
Fees (e)		  .10%  .10%  .10%  .10%  .10%  .10%  .10%  .10%  .10%
Distribution and/or Service
(12b-1) Fees		  .25%  1.00%  .75%  None   .25%  None  .10%  None   None
Other Expenses:                                    
Transfer Agent  .17%  .22%  .18%  .17%  .10%  .02%  .00%(f)  .00%(f)  .00%(f)
Other Expenses  .02%  .02%  .02%  .02%  .02%  .02%  .02%  .02%  .02%
                                     
Total Other Expenses  .19%  .24%  .20%  .19%  .12%  .04%  .02%  .02%  .02%
                                     
Total Annual Portfolio
Operating Expenses(g)		  .54%  1.34%  1.05%  .29%  .47%  .14%  .22%  .12%  .12%
                                     

 

  (e) The Management Fee is .20% of the Portfolio’s average daily net assets. The Adviser has contractually agreed to waive .10% of the Management Fee until August 31, 2019.
  (f) Amount is equal to less than .005%.
  (g) Total Annual Portfolio Operating Expenses are restated to reflect current fees.

 

 
 

 Examples

The Examples are intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your Portfolio shares at the end of those periods. The Examples also assume that your investment has a 5% return each year, that the Portfolio’s operating expenses stay the same and that any fee waiver is in effect for only the first year. Although your actual costs may be higher or lower, based on these assumptions your costs would be: 

 

   Class A  Class B  Class C  Advisor
Class		  Class K  Class I  Class 1  Class AB  Institutional
Class
After 1 Year  $55   $536   $207   $30   $48   $14   $24   $12   $12 
After 3 Years  $195   $646   $355   $115   $173   $67   $96   $61   $61 
After 5 Years  $347   $777   $623   $209   $308   $125   $175   $114   $114 
After 10 Years  $789   $1,497   $1,389   $483   $704   $296   $408   $270   $270 

 

For the share classes listed below, you would pay the following expenses if you did not redeem your shares at the end of the period:

 

   Class B  Class C
After 1 Year  $136   $107 
After 3 Years  $446   $355 
After 5 Years  $777   $623 
After 10 Years  $1,497   $1,389 

 

 

* * *
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Portfolio Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination August 31, 2019
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Total Annual Portfolio Operating Expenses are restated to reflect current fees.
Expense Example [Heading] rr_ExpenseExampleHeading Examples
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The Examples are intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your Portfolio shares at the end of those periods. The Examples also assume that your investment has a 5% return each year, that the Portfolio’s operating expenses stay the same and that any fee waiver is in effect for only the first year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption For the share classes listed below, you would pay the following expenses if you did not redeem your shares at the end of the period:
AB Government Money Market Portfolio | Class A  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.20%
Net Management Fees abfis_NetManagementFeesOverAssets 0.10% [1]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.17%
Other Expenses rr_Component2OtherExpensesOverAssets 0.02%
Total Other Expenses rr_OtherExpensesOverAssets 0.19%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.54% [2]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.10%)
After 1 Year rr_ExpenseExampleYear01 $ 55
After 3 Years rr_ExpenseExampleYear03 195
After 5 Years rr_ExpenseExampleYear05 347
After 10 Years rr_ExpenseExampleYear10 $ 789
AB Government Money Market Portfolio | Class B  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.20%
Net Management Fees abfis_NetManagementFeesOverAssets 0.10% [1]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.22%
Other Expenses rr_Component2OtherExpensesOverAssets 0.02%
Total Other Expenses rr_OtherExpensesOverAssets 0.24%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.34% [2]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.10%)
After 1 Year rr_ExpenseExampleYear01 $ 536
After 3 Years rr_ExpenseExampleYear03 646
After 5 Years rr_ExpenseExampleYear05 777
After 10 Years rr_ExpenseExampleYear10 1,497
After 1 Year rr_ExpenseExampleNoRedemptionYear01 136
After 3 Years rr_ExpenseExampleNoRedemptionYear03 446
After 5 Years rr_ExpenseExampleNoRedemptionYear05 777
After 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,497
AB Government Money Market Portfolio | Class C  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.20%
Net Management Fees abfis_NetManagementFeesOverAssets 0.10% [1]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.18%
Other Expenses rr_Component2OtherExpensesOverAssets 0.02%
Total Other Expenses rr_OtherExpensesOverAssets 0.20%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.05% [2]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.10%)
After 1 Year rr_ExpenseExampleYear01 $ 207
After 3 Years rr_ExpenseExampleYear03 355
After 5 Years rr_ExpenseExampleYear05 623
After 10 Years rr_ExpenseExampleYear10 1,389
After 1 Year rr_ExpenseExampleNoRedemptionYear01 107
After 3 Years rr_ExpenseExampleNoRedemptionYear03 355
After 5 Years rr_ExpenseExampleNoRedemptionYear05 623
After 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,389
AB Government Money Market Portfolio | Advisor Class  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.20%
Net Management Fees abfis_NetManagementFeesOverAssets 0.10% [1]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.17%
Other Expenses rr_Component2OtherExpensesOverAssets 0.02%
Total Other Expenses rr_OtherExpensesOverAssets 0.19%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.29% [2]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.10%)
After 1 Year rr_ExpenseExampleYear01 $ 30
After 3 Years rr_ExpenseExampleYear03 115
After 5 Years rr_ExpenseExampleYear05 209
After 10 Years rr_ExpenseExampleYear10 $ 483
AB Government Money Market Portfolio | Class K  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.20%
Net Management Fees abfis_NetManagementFeesOverAssets 0.10% [1]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.10%
Other Expenses rr_Component2OtherExpensesOverAssets 0.02%
Total Other Expenses rr_OtherExpensesOverAssets 0.12%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.47% [2]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.10%)
After 1 Year rr_ExpenseExampleYear01 $ 48
After 3 Years rr_ExpenseExampleYear03 173
After 5 Years rr_ExpenseExampleYear05 308
After 10 Years rr_ExpenseExampleYear10 $ 704
AB Government Money Market Portfolio | Class I  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.20%
Net Management Fees abfis_NetManagementFeesOverAssets 0.10% [1]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.02%
Other Expenses rr_Component2OtherExpensesOverAssets 0.02%
Total Other Expenses rr_OtherExpensesOverAssets 0.04%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.14% [2]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.10%)
After 1 Year rr_ExpenseExampleYear01 $ 14
After 3 Years rr_ExpenseExampleYear03 67
After 5 Years rr_ExpenseExampleYear05 125
After 10 Years rr_ExpenseExampleYear10 $ 296
AB Government Money Market Portfolio | Class 1  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.20%
Net Management Fees abfis_NetManagementFeesOverAssets 0.10% [1]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets none [3]
Other Expenses rr_Component2OtherExpensesOverAssets 0.02%
Total Other Expenses rr_OtherExpensesOverAssets 0.02%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.22% [2]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.10%)
After 1 Year rr_ExpenseExampleYear01 $ 24
After 3 Years rr_ExpenseExampleYear03 96
After 5 Years rr_ExpenseExampleYear05 175
After 10 Years rr_ExpenseExampleYear10 $ 408
AB Government Money Market Portfolio | Class AB  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.20%
Net Management Fees abfis_NetManagementFeesOverAssets 0.10% [1]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets none [3]
Other Expenses rr_Component2OtherExpensesOverAssets 0.02%
Total Other Expenses rr_OtherExpensesOverAssets 0.02%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.12% [2]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.10%)
After 1 Year rr_ExpenseExampleYear01 $ 12
After 3 Years rr_ExpenseExampleYear03 61
After 5 Years rr_ExpenseExampleYear05 114
After 10 Years rr_ExpenseExampleYear10 $ 270
AB Government Money Market Portfolio | Institutional Class  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.20%
Net Management Fees abfis_NetManagementFeesOverAssets 0.10% [1]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets none [3]
Other Expenses rr_Component2OtherExpensesOverAssets 0.02%
Total Other Expenses rr_OtherExpensesOverAssets 0.02%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.12% [2]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.10%)
After 1 Year rr_ExpenseExampleYear01 $ 12
After 3 Years rr_ExpenseExampleYear03 61
After 5 Years rr_ExpenseExampleYear05 114
After 10 Years rr_ExpenseExampleYear10 $ 270
[1] The Management Fee is .20% of the Portfolio’s average daily net assets. The Adviser has contractually agreed to waive .10% of the Management Fee until August 31, 2019.
[2] Total Annual Portfolio Operating Expenses are restated to reflect current fees.
[3] Amount is equal to less than .005%.