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Investments - Amortized cost or cost and fair value of available for sale securities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost $ 255,993 $ 259,210    
Allowance for credit losses (186) (98) $ (186) $ (7)
Gross Unrealized Gains 2,222 19,993    
Gross Unrealized Losses (31,873) (1,903)    
Bonds available for sale [1] 226,156 277,202    
Non-Investment Grade        
Debt Securities, Available-for-sale [Line Items]        
Bonds available for sale $ 22,300 $ 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 $ 7,094 $ 7,874    
Allowance for credit losses 0 0    
Gross Unrealized Gains 21 347    
Gross Unrealized Losses (496) (27)    
Bonds available for sale 6,619 8,194    
Obligations of states, municipalities and political subdivisions        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 13,195 12,760    
Allowance for credit losses 0 0    
Gross Unrealized Gains 99 1,782    
Gross Unrealized Losses (1,195) (15)    
Bonds available for sale 12,099 14,527    
Non-U.S. governments        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 15,133 15,858    
Allowance for credit losses (6) 0    
Gross Unrealized Gains 91 719    
Gross Unrealized Losses (1,733) (247)    
Bonds available for sale 13,485 16,330    
Corporate debt        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 160,242 163,064    
Allowance for credit losses (132) (89)    
Gross Unrealized Gains 1,152 13,892    
Gross Unrealized Losses (23,423) (1,259)    
Bonds available for sale 137,839 175,608    
Mortgage-backed, asset-backed and collateralized        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 60,329 59,654    
Allowance for credit losses (48) (9)    
Gross Unrealized Gains 859 3,253    
Gross Unrealized Losses (5,026) (355)    
Bonds available for sale 56,114 62,543    
RMBS        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 19,584 25,027    
Allowance for credit losses (37) (9)    
Gross Unrealized Gains 807 2,422    
Gross Unrealized Losses (1,537) (153)    
Bonds available for sale 18,817 27,287    
CMBS        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 15,610 15,333    
Allowance for credit losses (11) 0    
Gross Unrealized Gains 14 555    
Gross Unrealized Losses (1,420) (79)    
Bonds available for sale 14,193 15,809    
CLO/ABS        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 25,135 19,294    
Allowance for credit losses 0 0    
Gross Unrealized Gains 38 276    
Gross Unrealized Losses (2,069) (123)    
Bonds available for sale $ 23,104 $ 19,447    
[1] See Note 9 for details of balances associated with variable interest entities.