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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType Other
Document Period End Date dei_DocumentPeriodEndDate Oct. 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 Sep. 16, 2011
Document Effective Date dei_DocumentEffectiveDate Sep. 16, 2011
Prospectus Date rr_ProspectusDate Mar. 01, 2011
Supplement [Text Block] abf809593_SupplementTextBlock
American Beacon FUNDSSM
American Beacon Balanced Fund
American Beacon Large Cap Value Fund
American Beacon Large Cap Growth Fund
American Beacon Mid-Cap Value Fund
American Beacon Small Cap Value Fund
American Beacon International Equity Fund
American Beacon Emerging Markets Fund
American Beacon High Yield Bond Fund
 
Supplement Dated September 16, 2011
To the Prospectus dated March 1, 2011
American Beacon High Yield Bond Fund | Class A, C, Institutional, Y and Investor
  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] abf809593_SupplementTextBlock
 
 
The information below supplements the Prospectus dated March 1, 2011, and is in addition to any other supplements.
 
High Yield Bond Fund
 
On August 10, 2011, the American Beacon Funds’ Board of Trustees approved the appointment of PENN Capital Management Company, Inc. (“PENN”) as a sub-advisor to the American Beacon High Yield Bond Fund. PENN will begin managing assets of the Fund on September 16, 2011. The information below supplements the prospectus to reflect the addition of PENN as a sub-advisor.
 
In the “Fees and Expenses of the Fund” section, the Annual Fund Operating Expenses table is restated 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)
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets provided in the Fund's Financial Highlights table, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses
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 by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Share classes
Expense Example, No Redemption rr_ExpenseExampleNoRedemptionAbstract  
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption Assuming no redemption of shares:
Supplement Strategy [Text Block] abf809593_SupplementStrategyTextBlock

In the “Principal Investment Strategies” section, the last sentence in the second paragraph is deleted and replaced with the following:

The Fund’s assets are currently allocated among the Manager and three investment sub-advisors.
American Beacon High Yield Bond Fund | Class A, C, Institutional, Y and Investor | Class A, American Beacon High Yield Bond Fund
  
Annual Fund Operating Expenses rr_OperatingExpensesAbstract  
Share class rr_OperatingExpensesColumnName A
Management fees rr_ManagementFeesOverAssets 0.41%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.66%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total annual fund operating expenses rr_ExpensesOverAssets 1.33% [1]
Expense waiver and reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.21%
Total fund operating expenses after expense waiver and reimbursement rr_NetExpensesOverAssets 1.12% [2]
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 29, 2012
Example rr_ExpenseExampleAbstract  
Share classes rr_ExpenseExampleByYearColumnName A
1 year rr_ExpenseExampleYear01 584
3 years rr_ExpenseExampleYear03 857
5 years rr_ExpenseExampleYear05 1,150
10 years rr_ExpenseExampleYear10 1,983
American Beacon High Yield Bond Fund | Class A, C, Institutional, Y and Investor | C Class, American Beacon High Yield Bond Fund
  
Annual Fund Operating Expenses rr_OperatingExpensesAbstract  
Share class rr_OperatingExpensesColumnName C
Management fees rr_ManagementFeesOverAssets 0.41%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.66%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total annual fund operating expenses rr_ExpensesOverAssets 2.08% [1]
Expense waiver and reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.21%
Total fund operating expenses after expense waiver and reimbursement rr_NetExpensesOverAssets 1.87% [2]
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 29, 2012
Example rr_ExpenseExampleAbstract  
Share classes rr_ExpenseExampleByYearColumnName C
1 year rr_ExpenseExampleYear01 290
3 years rr_ExpenseExampleYear03 632
5 years rr_ExpenseExampleYear05 1,099
10 years rr_ExpenseExampleYear10 2,394
Expense Example, No Redemption rr_ExpenseExampleNoRedemptionAbstract  
Share class rr_ExpenseExampleNoRedemptionByYearColumnName C
1 year rr_ExpenseExampleNoRedemptionYear01 190
3 years rr_ExpenseExampleNoRedemptionYear03 632
5 years rr_ExpenseExampleNoRedemptionYear05 1,099
10 years rr_ExpenseExampleNoRedemptionYear10 2,394
American Beacon High Yield Bond Fund | Class A, C, Institutional, Y and Investor | Institutional Class, American Beacon High Yield Bond Fund
  
Annual Fund Operating Expenses rr_OperatingExpensesAbstract  
Share class rr_OperatingExpensesColumnName Institutional
Management fees rr_ManagementFeesOverAssets 0.41%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.40%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total annual fund operating expenses rr_ExpensesOverAssets 0.82% [1]
Example rr_ExpenseExampleAbstract  
Share classes rr_ExpenseExampleByYearColumnName Institutional
1 year rr_ExpenseExampleYear01 84
3 years rr_ExpenseExampleYear03 262
5 years rr_ExpenseExampleYear05 455
10 years rr_ExpenseExampleYear10 1,014
American Beacon High Yield Bond Fund | Class A, C, Institutional, Y and Investor | Y Class, American Beacon High Yield Bond Fund
  
Annual Fund Operating Expenses rr_OperatingExpensesAbstract  
Share class rr_OperatingExpensesColumnName Y
Management fees rr_ManagementFeesOverAssets 0.41%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.43%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total annual fund operating expenses rr_ExpensesOverAssets 0.85% [1]
Example rr_ExpenseExampleAbstract  
Share classes rr_ExpenseExampleByYearColumnName Y
1 year rr_ExpenseExampleYear01 87
3 years rr_ExpenseExampleYear03 271
5 years rr_ExpenseExampleYear05 471
10 years rr_ExpenseExampleYear10 1,049
American Beacon High Yield Bond Fund | Class A, C, Institutional, Y and Investor | Investor Class, American Beacon High Yield Bond Fund
  
Annual Fund Operating Expenses rr_OperatingExpensesAbstract  
Share class rr_OperatingExpensesColumnName Investor
Management fees rr_ManagementFeesOverAssets 0.41%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.65%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total annual fund operating expenses rr_ExpensesOverAssets 1.07% [1]
Example rr_ExpenseExampleAbstract  
Share classes rr_ExpenseExampleByYearColumnName Investor
1 year rr_ExpenseExampleYear01 109
3 years rr_ExpenseExampleYear03 340
5 years rr_ExpenseExampleYear05 590
10 years rr_ExpenseExampleYear10 1,306
[1] The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets provided in the Fund's Financial Highlights table, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses
[2] The Manager has contractually agreed to waive and/or reimburse the A Class and C Class of the Fund for Distribution Fees and Other Expenses, as applicable, through February 29, 2012 to the extent that Total Annual Fund Operating Expenses exceed 1.12% for the A Class and 1.87% for the C 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.