Label	Element	Value
Prospectus [Line Items]	rr_ProspectusLineItems
Document Type	dei_DocumentType	497
Document Period End Date	dei_DocumentPeriodEndDate	Aug. 31, 2023
Entity Registrant Name	dei_EntityRegistrantName	AMERICAN BEACON FUNDS
Entity Central Index Key	dei_EntityCentralIndexKey	0000809593
Entity Inv Company Type	dei_EntityInvCompanyType	N-1A
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Jun. 27, 2024
Document Effective Date	dei_DocumentEffectiveDate	Jun. 27, 2024
Prospectus Date	rr_ProspectusDate	Jan. 01, 2024
American Beacon SiM High Yield Opportunities Fund
Prospectus [Line Items]	rr_ProspectusLineItems
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	Shareholder Fees (fees paid directly from your investment)
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	December 31, 2025
American Beacon SiM High Yield Opportunities Fund | A Class
Prospectus [Line Items]	rr_ProspectusLineItems
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	4.75%
Maximum Deferred Sales Charge (as a percentage)	rr_MaximumDeferredSalesChargeOverOther	1.00%	[1]
Management Fees (as a percentage of Assets)	rr_ManagementFeesOverAssets	0.71%
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses (as a percentage of Assets):	rr_OtherExpensesOverAssets	0.17%
Expenses (as a percentage of Assets)	rr_ExpensesOverAssets	1.13%
Fee Waiver or Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.06%)	[2]
Net Expenses (as a percentage of Assets)	rr_NetExpensesOverAssets	1.07%
American Beacon SiM High Yield Opportunities Fund | C Class
Prospectus [Line Items]	rr_ProspectusLineItems
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (as a percentage)	rr_MaximumDeferredSalesChargeOverOther	1.00%
Management Fees (as a percentage of Assets)	rr_ManagementFeesOverAssets	0.71%
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses (as a percentage of Assets):	rr_OtherExpensesOverAssets	0.15%
Expenses (as a percentage of Assets)	rr_ExpensesOverAssets	1.86%
Fee Waiver or Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.05%)	[2]
Net Expenses (as a percentage of Assets)	rr_NetExpensesOverAssets	1.81%
American Beacon SiM High Yield Opportunities Fund | Y Class
Prospectus [Line Items]	rr_ProspectusLineItems
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (as a percentage)	rr_MaximumDeferredSalesChargeOverOther	none
Management Fees (as a percentage of Assets)	rr_ManagementFeesOverAssets	0.71%
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses (as a percentage of Assets):	rr_OtherExpensesOverAssets	0.18%
Expenses (as a percentage of Assets)	rr_ExpensesOverAssets	0.89%
Fee Waiver or Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.14%)	[2]
Net Expenses (as a percentage of Assets)	rr_NetExpensesOverAssets	0.75%
American Beacon SiM High Yield Opportunities Fund | R5 Class
Prospectus [Line Items]	rr_ProspectusLineItems
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (as a percentage)	rr_MaximumDeferredSalesChargeOverOther	none
Management Fees (as a percentage of Assets)	rr_ManagementFeesOverAssets	0.71%
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses (as a percentage of Assets):	rr_OtherExpensesOverAssets	0.10%
Expenses (as a percentage of Assets)	rr_ExpensesOverAssets	0.81%
Fee Waiver or Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.07%)	[2]
Net Expenses (as a percentage of Assets)	rr_NetExpensesOverAssets	0.74%
American Beacon SiM High Yield Opportunities Fund | Investor Class
Prospectus [Line Items]	rr_ProspectusLineItems
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (as a percentage)	rr_MaximumDeferredSalesChargeOverOther	none
Management Fees (as a percentage of Assets)	rr_ManagementFeesOverAssets	0.71%
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses (as a percentage of Assets):	rr_OtherExpensesOverAssets	0.44%
Expenses (as a percentage of Assets)	rr_ExpensesOverAssets	1.15%
Fee Waiver or Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.05%)	[2]
Net Expenses (as a percentage of Assets)	rr_NetExpensesOverAssets	1.10%

[1] Effective July 1, 2024, the Fund will no longer assess a front-end sales load on purchases of A Class shares of $500,000 or more. However, the Fund will assess a contingent deferred sales charge (“CDSC”) of 1.00% on certain purchases of $500,000 or more of A Class shares that are redeemed in whole or part within 18 months of purchase.

[2] American Beacon Advisors, Inc. (the “Manager”) has contractually agreed to waive fees and/or reimburse expenses of the Fund’s A Class, C Class, Y Class, R5 Class, and Investor Class shares, as applicable, through December 31, 2025, to the extent that Total Annual Fund Operating Expenses exceed 1.07% for the A Class, 1.81% for the C Class, 0.75% for the Y Class, 0.74% for the R5 Class, and 1.10% for the Investor Class (excluding taxes, interest, brokerage commissions, acquired fund fees and expenses, securities lending fees, expenses associated with securities sold short, litigation, and other extraordinary expenses). The contractual expense reimbursement can be changed or terminated only in the discretion and with the approval of a majority of the Fund’s Board of Trustees (“Board”). The Manager will itself waive fees and/or reimburse expenses of the Fund to maintain the contractual expense ratio caps for each applicable class of shares or make arrangements with other service providers to do so. The Manager may also, from time to time, voluntarily waive fees and/or reimburse expenses of the Fund. The Manager can be reimbursed by the Fund for any contractual or voluntary fee waivers or expense reimbursements if reimbursement to the Manager (a) occurs within three years from the date of the Manager’s waiver/reimbursement and (b) does not cause the Total Annual Fund Operating Expenses of a class to exceed the lesser of the contractual percentage limit in effect at the time of the waiver/reimbursement or the time of the recoupment.