v3.19.2
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2019
Aug. 02, 2019
Entity Listings [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Entity Registrant Name American International Group, Inc.  
Entity Central Index Key 0000005272  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock Shares Outstanding   869,908,302
Entity Shell Company false  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Ex Transition Period false  
Entity File Number 1-8787  
Entity Incorporation State Country Code DE  
Entity Tax Identification Number 13-2592361  
Entity Address Address Line 1 175 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  
Document Quarterly Report true  
Document Transition Report false  
Common Stock    
Entity Listings [Line Items]    
Security 12b Title Common Stock, Par Value $2.50 Per Share  
Trading Symbol AIG  
Security Exchange Name NYSE  
Warrants    
Entity Listings [Line Items]    
Security 12b Title Warrants (expiring January 19, 2021)  
Trading Symbol AIG WS  
Security Exchange Name NYSE  
5.75% Series A-2 Junior Sebordinated Debentures    
Entity Listings [Line Items]    
Security 12b Title 5.75% Series A-2 Junior Subordinated Debentures  
Trading Symbol AIG 67BP  
Security Exchange Name NYSE  
4.875% Series A-3 Junior Subordinated Debentures    
Entity Listings [Line Items]    
Security 12b Title 4.875% Series A-3 Junior Subordinated Debentures  
Trading Symbol AIG 67EU  
Security Exchange Name NYSE  
Stock Purchase Rights    
Entity Listings [Line Items]    
Security 12b Title Stock Purchase Rights  
No Trading Symbol Flag true  
Security Exchange Name NYSE  
Depository Shares Each Representing 1/1,000th Interest in a Share of Series A 5.85% Non-Cumulative Perpetual Preferred Stock    
Entity Listings [Line Items]    
Security 12b Title Depositary Shares  
Trading Symbol AIG PRA  
Security Exchange Name NYSE