v3.3.1.900
Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2015
Feb. 11, 2016
Jun. 30, 2015
Document and Entity Information      
Entity Registrant Name AMERICAN INTERNATIONAL GROUP INC    
Entity Central Index Key 0000005272    
Document Type 10-K    
Document Period End Date Dec. 31, 2015    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 80,826,000,000
Entity Common Stock, Shares Outstanding   1,149,448,256  
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY