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Equity - Reclassification of significant items out of accumulated other comprehensive income (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Reclassification of significant items out of Accumulated Other Comprehensive Income        
Total net realized gains $ 3,175 $ 660 $ 10,986 $ 1,984
Net income attributable to AIG 2,709 1,667 10,005 5,642
Amount Reclassified from AOCI        
Reclassification of significant items out of Accumulated Other Comprehensive Income        
Net income attributable to AIG (139) 214 (897) 715
Unrealized appreciation (depreciation) of fixed maturity securities on which allowance for credit losses was taken | Amount Reclassified from AOCI        
Reclassification of significant items out of Accumulated Other Comprehensive Income        
Total net realized gains 17 6 9 0
Unrealized appreciation (depreciation) of all other investments | Amount Reclassified from AOCI        
Reclassification of significant items out of Accumulated Other Comprehensive Income        
Total net realized gains (148) 219 (883) 749
Change in retirement plan liabilities adjustment | Amount Reclassified from AOCI        
Reclassification of significant items out of Accumulated Other Comprehensive Income        
Total net realized gains (8) (11) (23) (34)
Prior-service credit | Amount Reclassified from AOCI        
Reclassification of significant items out of Accumulated Other Comprehensive Income        
Total net realized gains (1) (1) (2) (3)
Actuarial losses | Amount Reclassified from AOCI        
Reclassification of significant items out of Accumulated Other Comprehensive Income        
Total net realized gains $ (7) $ (10) $ (21) $ (31)