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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType Other
Document Period End Date dei_DocumentPeriodEndDate Aug. 31, 2011
Registrant Name dei_EntityRegistrantName AMERICAN BEACON FUNDS
Central Index Key dei_EntityCentralIndexKey 0000809593
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Jan. 31, 2012
Document Effective Date dei_DocumentEffectiveDate Jan. 31, 2012
Prospectus Date rr_ProspectusDate Dec. 30, 2011
Supplement [Text Block] abf809593_SupplementTextBlock
American Beacon FUNDSSM
American Beacon Flexible Bond Fund
Supplement Dated January 31, 2012
To the Prospectus dated December 30, 2011
The information below supplements the Prospectus dated December 30, 2011, and is in addition to any other supplements.
American Beacon Flexible Bond Fund
  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] abf809593_SupplementTextBlock In the “Fees and Expenses of the Fund” section, the Annual Fund Operating Expenses table is replaced with the following table:
Annual Fund Operating Expenses rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Based on estimated expenses for the fiscal year ending August 31, 2012.
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination December 31, 2012
Example rr_ExpenseExampleAbstract  
Supplement Expense Example [Text Block] abf809593_SupplementExpenseExampleTextBlock In the “Fees and Expenses of the Fund” section, the Example table is replaced with the following table:
Expense Example, No Redemption rr_ExpenseExampleNoRedemptionAbstract  
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption Assuming no redemption of shares:
American Beacon Flexible Bond Fund | A
  
Annual Fund Operating Expenses rr_OperatingExpensesAbstract  
Share classes rr_OperatingExpensesColumnName A
Management fees rr_ManagementFeesOverAssets 0.63%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.97% [1]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total annual fund operating expenses rr_ExpensesOverAssets 1.86%
Expense waiver and reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.47%
Total fund operating expenses after expense waiver and reimbursement rr_NetExpensesOverAssets 1.39% [2]
Example rr_ExpenseExampleAbstract  
Share classes rr_ExpenseExampleByYearColumnName A
1 year rr_ExpenseExampleYear01 610
3 years rr_ExpenseExampleYear03 988
American Beacon Flexible Bond Fund | C
  
Annual Fund Operating Expenses rr_OperatingExpensesAbstract  
Share classes rr_OperatingExpensesColumnName C
Management fees rr_ManagementFeesOverAssets 0.63%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.97% [1]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets none
Total annual fund operating expenses rr_ExpensesOverAssets 2.60%
Expense waiver and reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.46%
Total fund operating expenses after expense waiver and reimbursement rr_NetExpensesOverAssets 2.14% [2]
Example rr_ExpenseExampleAbstract  
Share classes rr_ExpenseExampleByYearColumnName C
1 year rr_ExpenseExampleYear01 317
3 years rr_ExpenseExampleYear03 765
Expense Example, No Redemption rr_ExpenseExampleNoRedemptionAbstract  
Share class rr_ExpenseExampleNoRedemptionByYearColumnName C
1 year rr_ExpenseExampleNoRedemptionYear01 217
3 years rr_ExpenseExampleNoRedemptionYear03 765
American Beacon Flexible Bond Fund | Y
  
Annual Fund Operating Expenses rr_OperatingExpensesAbstract  
Share classes rr_OperatingExpensesColumnName Y
Management fees rr_ManagementFeesOverAssets 0.63%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.82% [1]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total annual fund operating expenses rr_ExpensesOverAssets 1.46%
Expense waiver and reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.47%
Total fund operating expenses after expense waiver and reimbursement rr_NetExpensesOverAssets 0.99% [2]
Example rr_ExpenseExampleAbstract  
Share classes rr_ExpenseExampleByYearColumnName Y
1 year rr_ExpenseExampleYear01 101
3 years rr_ExpenseExampleYear03 416
American Beacon Flexible Bond Fund | Institutional
  
Annual Fund Operating Expenses rr_OperatingExpensesAbstract  
Share classes rr_OperatingExpensesColumnName Institutional
Management fees rr_ManagementFeesOverAssets 0.63%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.72% [1]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total annual fund operating expenses rr_ExpensesOverAssets 1.36%
Expense waiver and reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.46%
Total fund operating expenses after expense waiver and reimbursement rr_NetExpensesOverAssets 0.90% [2]
Example rr_ExpenseExampleAbstract  
Share classes rr_ExpenseExampleByYearColumnName Institutional
1 year rr_ExpenseExampleYear01 92
3 years rr_ExpenseExampleYear03 385
American Beacon Flexible Bond Fund | Investor
  
Annual Fund Operating Expenses rr_OperatingExpensesAbstract  
Share classes rr_OperatingExpensesColumnName Investor
Management fees rr_ManagementFeesOverAssets 0.63%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 1.10% [1]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total annual fund operating expenses rr_ExpensesOverAssets 1.74%
Expense waiver and reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.47%
Total fund operating expenses after expense waiver and reimbursement rr_NetExpensesOverAssets 1.27% [2]
Example rr_ExpenseExampleAbstract  
Share classes rr_ExpenseExampleByYearColumnName Investor
1 year rr_ExpenseExampleYear01 129
3 years rr_ExpenseExampleYear03 501
[1] Based on estimated expenses for the fiscal year ending August 31, 2012.
[2] The Manager has contractually agreed to waive and/or reimburse the A Class, C Class, Y Class, Institutional Class and Investor Class of the Fund for Distribution Fees and Other Expenses, as applicable through December 31, 2012 to the extent that Total Annual Fund Operating Expenses exceed 1.39% for the A Class, 2.14% for the C Class, 0.99% for the Y Class, 0.90% for the Institutional Class, and 1.27% for the Investor Class (excluding taxes, brokerage commissions, acquired fund fees and expenses and other extraordinary expenses such as litigation). The contractual expense arrangement can be changed by approval of a majority of the Fund's Board of Trustees. The Manager can be reimbursed by the Fund for any contractual or voluntary fee reductions or expense reimbursements if reimbursement to the Manager (a) occurs within three years after the Manager's own reduction or reimbursement and (b) does not cause the Total Annual Fund Operating Expenses of a class to exceed the percentage limit contractually agreed.