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Label Element Value
AIG Strategic Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] ck0000795307_SupplementTextBlock

SunAmerica Income Funds


AIG Strategic Bond Fund


Class T


(the “Fund”)


Supplement dated November 19, 2018, to the Prospectus


and Statement of Additional Information


each dated July 30, 2018, as supplemented and amended to date


Effective November 19, 2018, pursuant to an Amended and Restated Advisory Fee Waiver Agreement, SunAmerica Asset Management, LLC has contractually agreed to waive further a portion of its fees payable by the Fund through July 31, 2020. Accordingly, the following changes to the Prospectus and Statement of Additional Information are effective as of November 19, 2018:

Risk/Return [Heading] rr_RiskReturnHeading AIG Strategic Bond Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The table in the subsection of the Fund’s Prospectus entitled “Fund Highlights: AIG Strategic Bond Fund – Fees and Expenses of the Fund” is deleted in its entirety and replaced with the following:

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 Jul. 31, 2020
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Other expenses are based on estimated amounts for the current fiscal year.
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock

PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE.

AIG Strategic Bond Fund | Class T  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 2.50%
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the amount redeemed or original purchase cost) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.65%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.84% [1]
Total Annual Fund Operating Expenses Before Fee Waiver and/or Expense Reimbursement rr_ExpensesOverAssets 1.74%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.44% [2],[3]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.30% [2],[3]
[1] Other expenses are based on estimated amounts for the current fiscal year.
[2] Pursuant to an Advisory Fee Waiver Agreement, effective November 19, 2018, SunAmerica is contractually obligated to waive its management fee with respect to the Fund so that the management fee payable by the Fund to SunAmerica equals 0.38% on the first $350 million of average daily net assets and 0.33% above $350 million of average daily net assets. This agreement will continue in effect through July 31, 2020, and from year to year thereafter provided such continuance is agreed to by SunAmerica and approved by a majority of the Independent Trustees.
[3] Pursuant to an Expense Limitation Agreement, SunAmerica Asset Management, LLC ("SunAmerica") is contractually obligated to waive its fees and/or reimburse expenses to the extent that the Total Annual Fund Operating Expenses exceed 1.30% for Class T shares. For purposes of the Expense Limitation Agreement, "Total Annual Fund Operating Expenses" shall not include extraordinary expenses (i.e., expenses that are unusual in nature and/or infrequent in occurrence, such as litigation), or acquired fund fees and expenses, brokerage commissions and other transactional expenses relating to the purchase and sale of portfolio securities, interest, taxes and governmental fees, and other expenses not incurred in the ordinary course of the Fund's business. This agreement will continue in effect indefinitely, unless terminated by the Board of Trustees, including a majority of the trustees of the Board of Trustees who are not "interested persons" of SunAmerica Income Funds as defined in the Investment Company Act of 1940, as amended (the "Independent Trustees").