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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Feb. 08, 2024
Jun. 30, 2023
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 1-8787    
Entity Registrant Name American International Group, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 13-2592361    
Entity Address, Address Line One 1271 Avenue of the Americas    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10020    
City Area Code (212)    
Local Phone Number 770-7000    
Entity Well Known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Document Financial Statement Error Correction [Flag] false    
Entity Public Float     $ 36,903
Entity Common Stock, Shares Outstanding   680,953,652  
Documents Incorporated By Reference
Document of the Registrant
Form 10-K Reference Locations
Portions of the registrant’s definitive proxy statement for the 2024 Annual Meeting of Shareholders
Part III, Items 10, 11, 12, 13 and 14
    
Document Fiscal Year Focus 2023    
Entity Central Index Key 0000005272    
Document Fiscal Period Focus FY    
Amendment Flag 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    
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    
Depositary Shares Each Representing a 1/1,000th Interest in a Share of Series A 5.85% Non-Cumulative Perpetual Preferred Stock      
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