Cover
Feb. 13, 2020
Document Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Feb. 13, 2020
Entity File Number 1-8787
Entity Registrant Name AMERICAN INTERNATIONAL GROUP, INC.
Entity Central Index Key 0000005272
Entity Tax Identification Number 13-2592361
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 175 Water Street
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10038
City Area Code 212
Local Phone Number 770-7000
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock, Par Value $2.50 Per Share  
Document Information [Line Items]  
Title of 12(b) Security Common Stock, Par Value $2.50 Per Share
Trading Symbol AIG
Security Exchange Name NYSE
Warrants  
Document Information [Line Items]  
Title of 12(b) Security Warrants (expiring January 19, 2021)
Trading Symbol AIG WS
Security Exchange Name NYSE
5.75% Series A-2 Junior Subordinated Debentures  
Document Information [Line Items]  
Title of 12(b) Security 5.75% Series A-2 Junior Subordinated Debentures
Trading Symbol AIG 67BP
Security Exchange Name NYSE
4.875% Series A-3 Junior Subordinated Debentures  
Document Information [Line Items]  
Title of 12(b) Security 4.875% Series A-3 Junior Subordinated Debentures
Trading Symbol AIG 67EU
Security Exchange Name NYSE
Stock Purchase Rights  
Document Information [Line Items]  
Title of 12(b) Security Stock Purchase Rights
No Trading Symbol Flag true
Security Exchange Name NYSE
Depositary Shares  
Document Information [Line Items]  
Title of 12(b) Security Depositary Shares Each Representing a 1/1,000th Interest in a Share of Series A 5.85% Non-Cumulative Perpetual Preferred Stock
Trading Symbol AIG PRA
Security Exchange Name NYSE