Mar. 31, 2018
AIG U.S. Government Securities Fund
AIG U.S. Government Securities Fund
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
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.

This table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $[_____] in [name of fund family] funds. Include the narrative explanations in the order indicated. A Fund may modify the narrative explanations if the explanation contains comparable information to that shown. The narrative explanation regarding sales charge discounts is only required by a Fund that offers such discounts and should specify the minimum level of investment required to qualify for a discount. Modify the narrative explanation to state that Fund shares are sold on a national securities exchange at the end of the time periods indicated, and that brokerage commissions for buying and selling Fund shares through a broker are not reflected.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form
-Number N-1A
-Chapter A
-Section 3
-Subsection instructions
-Paragraph 1
-Subparagraph b

Name:	rr_ExpenseNarrativeTextBlock
Namespace Prefix:	rr_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration