Label

Element

Value

AIG U.S. Government Securities Fund

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

ck0000795307_SupplementTextBlock

SunAmerica Income Funds

AIG U.S. Government Securities Fund

(each, a “Fund”)

Supplement dated April 1, 2019

to each Fund’s Summary Prospectus and Prospectus, as supplemented and amended to date

Risk/Return [Heading]

rr_RiskReturnHeading

AIG U.S. Government Securities Fund

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

Effective immediately, in the section of each Summary Prospectus entitled “Fees and Expenses of the Fund,” the first sentence of footnote 1 to the table is deleted in its entirety and replaced with the following:

Purchases of Class A shares of $1 million or more will be subject to a contingent deferred sales charge (“CDSC”) on redemptions made within one year of purchase.

PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE.

AIG U.S. Government Securities Fund | Class A

Risk/Return:

rr_RiskReturnAbstract

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Purchases of Class A shares of $1 million or more will be subject to a contingent deferred sales charge (“CDSC”) on redemptions made within one year of purchase.