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Investments - Amortized cost or cost and fair value of available for sale securities (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost $ 252,877 $ 259,210        
Allowance for credit losses (175) (98) $ (191) $ (97) $ (122) $ (186)
Gross Unrealized Gains 3,377 19,993        
Gross Unrealized Losses (23,344) (1,903)        
Bonds available for sale [1] 232,735 277,202        
Non-Investment Grade            
Debt Securities, Available-for-sale [Line Items]            
Bonds available for sale $ 22,900 $ 27,000        
Non-Investment Grade | Credit Concentration Risk | Bonds available for sale            
Debt Securities, Available-for-sale [Line Items]            
Concentration risk, percentage 10.00% 10.00%        
U.S. government and government sponsored entities            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost $ 8,524 $ 7,874        
Allowance for credit losses 0 0        
Gross Unrealized Gains 48 347        
Gross Unrealized Losses (426) (27)        
Bonds available for sale 8,146 8,194        
Obligations of states, municipalities and political subdivisions            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 13,013 12,760        
Allowance for credit losses 0 0        
Gross Unrealized Gains 256 1,782        
Gross Unrealized Losses (669) (15)        
Bonds available for sale 12,600 14,527        
Non-U.S. governments            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 15,065 15,858        
Allowance for credit losses (71) 0        
Gross Unrealized Gains 123 719        
Gross Unrealized Losses (1,443) (247)        
Bonds available for sale 13,674 16,330        
Corporate debt            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 158,714 163,064        
Allowance for credit losses (77) (89)        
Gross Unrealized Gains 1,724 13,892        
Gross Unrealized Losses (17,620) (1,259)        
Bonds available for sale 142,741 175,608        
Mortgage-backed, asset-backed and collateralized            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 57,561 59,654        
Allowance for credit losses (27) (9)        
Gross Unrealized Gains 1,226 3,253        
Gross Unrealized Losses (3,186) (355)        
Bonds available for sale 55,574 62,543        
RMBS            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 20,060 25,027        
Allowance for credit losses (26) (9)        
Gross Unrealized Gains 1,125 2,422        
Gross Unrealized Losses (986) (153)        
Bonds available for sale 20,173 27,287        
CMBS            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 15,740 15,333        
Allowance for credit losses 0 0        
Gross Unrealized Gains 67 555        
Gross Unrealized Losses (920) (79)        
Bonds available for sale 14,887 15,809        
CDO/ABS            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 21,761 19,294        
Allowance for credit losses (1) 0        
Gross Unrealized Gains 34 276        
Gross Unrealized Losses (1,280) (123)        
Bonds available for sale $ 20,514 $ 19,447        
[1] See Note 8 for details of balances associated with variable interest entities.