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Equity - Non-Controlling Interest (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 19, 2022
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Noncontrolling Interest [Line Items]            
Net income attributable to AIG common shareholders     $ 2,702 $ 1,660 $ 9,983 $ 5,620
Contributions from noncontrolling interests     $ 17 $ 1 22 $ 8
Total AIG Shareholders' Equity            
Noncontrolling Interest [Line Items]            
Net income attributable to AIG common shareholders         $ 9,983  
Contributions from noncontrolling interests   $ 608        
Change from Net income attributable to AIG common shareholders and changes in AIG's ownership interests $ 10,591          
IPO | Corebridge Financial Inc            
Noncontrolling Interest [Line Items]            
Percentage of stock sold (as a percent)   12.40%        
Corebridge Financial Inc            
Noncontrolling Interest [Line Items]            
Ownership (as a percent) 77.70%   77.70%   77.70%