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Investments - Amortized cost or cost and fair value of available for sale securities (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Jun. 30, 2022
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost $ 251,983 $ 259,210        
Allowance for credit losses (115) (98) $ (175) $ (66) $ (97) $ (186)
Gross Unrealized Gains 2,188 19,993        
Gross Unrealized Losses (34,289) (1,903)        
Bonds available for sale [1] 219,767 277,202        
Non-Investment Grade            
Debt Securities, Available-for-sale [Line Items]            
Bonds available for sale $ 22,400 $ 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 $ 8,609 $ 7,874        
Allowance for credit losses 0 0        
Gross Unrealized Gains 20 347        
Gross Unrealized Losses (679) (27)        
Bonds available for sale 7,950 8,194        
Obligations of states, municipalities and political subdivisions            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 13,072 12,760        
Allowance for credit losses 0 0        
Gross Unrealized Gains 75 1,782        
Gross Unrealized Losses (1,256) (15)        
Bonds available for sale 11,891 14,527        
Non-U.S. governments            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 14,866 15,858        
Allowance for credit losses (9) 0        
Gross Unrealized Gains 92 719        
Gross Unrealized Losses (1,942) (247)        
Bonds available for sale 13,007 16,330        
Corporate debt            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 157,955 163,064        
Allowance for credit losses (75) (89)        
Gross Unrealized Gains 1,024 13,892        
Gross Unrealized Losses (25,568) (1,259)        
Bonds available for sale 133,336 175,608        
Mortgage-backed, asset-backed and collateralized            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 57,481 59,654        
Allowance for credit losses (31) (9)        
Gross Unrealized Gains 977 3,253        
Gross Unrealized Losses (4,844) (355)        
Bonds available for sale 53,583 62,543        
RMBS            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 19,174 25,027        
Allowance for credit losses (30) (9)        
Gross Unrealized Gains 908 2,422        
Gross Unrealized Losses (1,545) (153)        
Bonds available for sale 18,507 27,287        
CMBS            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 15,272 15,333        
Allowance for credit losses 0 0        
Gross Unrealized Gains 12 555        
Gross Unrealized Losses (1,353) (79)        
Bonds available for sale 13,931 15,809        
CDO/ABS            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 23,035 19,294        
Allowance for credit losses (1) 0        
Gross Unrealized Gains 57 276        
Gross Unrealized Losses (1,946) (123)        
Bonds available for sale $ 21,145 $ 19,447        
[1] See Note 8 for details of balances associated with variable interest entities.