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Investments - Amortized cost or cost and fair value of available for sale securities (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost $ 254,179 $ 255,993    
Allowance for credit losses (136) (186) $ (191) $ (98)
Gross Unrealized Gains 2,726 2,222    
Gross Unrealized Losses (27,372) (31,873)    
Bonds available for sale [1] 229,397 226,156    
Non-Investment Grade        
Debt Securities, Available-for-sale [Line Items]        
Bonds available for sale $ 19,600 $ 22,300    
Non-Investment Grade | Credit Concentration Risk | Bonds available for sale        
Debt Securities, Available-for-sale [Line Items]        
Concentration risk, percentage 9.00% 10.00%    
U.S. government and government sponsored entities        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost $ 5,995 $ 7,094    
Allowance for credit losses 0 0    
Gross Unrealized Gains 49 21    
Gross Unrealized Losses (289) (496)    
Bonds available for sale 5,755 6,619    
Obligations of states, municipalities and political subdivisions        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 12,344 13,195    
Allowance for credit losses 0 0    
Gross Unrealized Gains 161 99    
Gross Unrealized Losses (857) (1,195)    
Bonds available for sale 11,648 12,099    
Non-U.S. governments        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 14,928 15,133    
Allowance for credit losses (10) (6)    
Gross Unrealized Gains 109 91    
Gross Unrealized Losses (1,595) (1,733)    
Bonds available for sale 13,432 13,485    
Corporate debt        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 157,227 160,242    
Allowance for credit losses (81) (132)    
Gross Unrealized Gains 1,542 1,152    
Gross Unrealized Losses (20,117) (23,423)    
Bonds available for sale 138,571 137,839    
Mortgage-backed, asset-backed and collateralized        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 63,685 60,329    
Allowance for credit losses (45) (48)    
Gross Unrealized Gains 865 859    
Gross Unrealized Losses (4,514) (5,026)    
Bonds available for sale 59,991 56,114    
RMBS        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 20,230 19,584    
Allowance for credit losses (37) (37)    
Gross Unrealized Gains 778 807    
Gross Unrealized Losses (1,368) (1,537)    
Bonds available for sale 19,603 18,817    
CMBS        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 16,278 15,610    
Allowance for credit losses (8) (11)    
Gross Unrealized Gains 21 14    
Gross Unrealized Losses (1,417) (1,420)    
Bonds available for sale 14,874 14,193    
CLO/ABS        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 27,177 25,135    
Allowance for credit losses 0 0    
Gross Unrealized Gains 66 38    
Gross Unrealized Losses (1,729) (2,069)    
Bonds available for sale $ 25,514 $ 23,104    
[1] See Note 9 for details of balances associated with variable interest entities.