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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType Other
Document Period End Date dei_DocumentPeriodEndDate Dec. 31, 2010
Registrant Name dei_EntityRegistrantName AMERICAN BEACON FUNDS
Central Index Key dei_EntityCentralIndexKey 0000809593
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Mar. 08, 2012
Document Effective Date dei_DocumentEffectiveDate Mar. 08, 2012
Prospectus Date rr_ProspectusDate Mar. 01, 2011
Supplement [Text Block] abf809593_SupplementTextBlock
American Beacon FUNDSSM
 
American Beacon Treasury Inflation Protected Securities Fund
Supplement dated March 8, 2012
to the
Prospectus dated March 1, 2011
The information below supplements the Prospectus dated March 1, 2011.
American Beacon Treasury Inflation Protected Securities Fund
  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] abf809593_SupplementTextBlock In the “Fees and Expenses of the Fund” section on page 1 of the Prospectus, the Annual Fund Operating Expenses table is deleted and replaced with the following:
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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 1, 2013
American Beacon Treasury Inflation Protected Securities Fund | A
  
Annual Fund Operating Expenses rr_OperatingExpensesAbstract  
Share classes rr_OperatingExpensesColumnName A
Management fees rr_ManagementFeesOverAssets 0.12%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.62%
Total annual fund operating expenses rr_ExpensesOverAssets 0.99%
Expense Reduction and/or Reimbursement rr_FeeWaiverOrReimbursementOverAssets   
Total annual fund operating expenses after expense reduction and reimbursements rr_NetExpensesOverAssets   
American Beacon Treasury Inflation Protected Securities Fund | C
  
Annual Fund Operating Expenses rr_OperatingExpensesAbstract  
Share classes rr_OperatingExpensesColumnName C
Management fees rr_ManagementFeesOverAssets 0.12%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.65%
Total annual fund operating expenses rr_ExpensesOverAssets 1.77%
Expense Reduction and/or Reimbursement rr_FeeWaiverOrReimbursementOverAssets   
Total annual fund operating expenses after expense reduction and reimbursements rr_NetExpensesOverAssets   
American Beacon Treasury Inflation Protected Securities Fund | Institutional
  
Annual Fund Operating Expenses rr_OperatingExpensesAbstract  
Share classes rr_OperatingExpensesColumnName Institutional
Management fees rr_ManagementFeesOverAssets 0.12%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.23%
Total annual fund operating expenses rr_ExpensesOverAssets 0.35%
Expense Reduction and/or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.10% [1]
Total annual fund operating expenses after expense reduction and reimbursements rr_NetExpensesOverAssets 0.25%
American Beacon Treasury Inflation Protected Securities Fund | Y
  
Annual Fund Operating Expenses rr_OperatingExpensesAbstract  
Share classes rr_OperatingExpensesColumnName Y
Management fees rr_ManagementFeesOverAssets 0.12%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.48%
Total annual fund operating expenses rr_ExpensesOverAssets 0.60%
Expense Reduction and/or Reimbursement rr_FeeWaiverOrReimbursementOverAssets   
Total annual fund operating expenses after expense reduction and reimbursements rr_NetExpensesOverAssets   
American Beacon Treasury Inflation Protected Securities Fund | Investor
  
Annual Fund Operating Expenses rr_OperatingExpensesAbstract  
Share classes rr_OperatingExpensesColumnName Investor
Management fees rr_ManagementFeesOverAssets 0.12%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.63%
Total annual fund operating expenses rr_ExpensesOverAssets 0.75%
Expense Reduction and/or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.06%
Total annual fund operating expenses after expense reduction and reimbursements rr_NetExpensesOverAssets 0.69% [2]
[1] The Manager has contractually agreed to reduce Other Expenses for the Institutional Class in an amount equal to 0.10% of the average daily net assets of that class through May 1, 2013. The administrative services fee reduction can be changed only by approval 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.
[2] Total annual fund operating expenses after expense reduction and reimbursements have been restated to reflect the current contractual expense arrangement. The Manager has contractually agreed to reimburse the Investor Class of the Fund for Other Expenses through May 1, 2013 to the extent that Total Annual Fund Operating Expenses exceed 0.69% 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 only 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.