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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, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost $ 255,067 $ 253,035    
Allowance for credit losses (125) (162) $ (136) $ (186)
Gross Unrealized Gains 2,966 3,261    
Gross Unrealized Losses (25,421) (24,401)    
Bonds available for sale [1] 232,487 231,733    
Non-Investment Grade        
Debt Securities, Available-for-sale [Line Items]        
Bonds available for sale $ 16,900 $ 17,100    
Non-Investment Grade | Credit Concentration Risk | Bonds available for sale        
Debt Securities, Available-for-sale [Line Items]        
Concentration risk (as a percent) 7.00% 7.00%    
U.S. government and government sponsored entities        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost $ 6,157 $ 5,885    
Allowance for credit losses 0 0    
Gross Unrealized Gains 23 58    
Gross Unrealized Losses (391) (327)    
Bonds available for sale 5,789 5,616    
Obligations of states, municipalities and political subdivisions        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 10,894 11,387    
Allowance for credit losses 0 0    
Gross Unrealized Gains 85 118    
Gross Unrealized Losses (886) (842)    
Bonds available for sale 10,093 10,663    
Non-U.S. governments        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 13,310 13,668    
Allowance for credit losses 0 (3)    
Gross Unrealized Gains 109 137    
Gross Unrealized Losses (1,451) (1,349)    
Bonds available for sale 11,968 12,453    
Corporate debt        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 153,436 154,674    
Allowance for credit losses (84) (90)    
Gross Unrealized Gains 1,598 1,898    
Gross Unrealized Losses (19,132) (18,050)    
Bonds available for sale 135,818 138,432    
Mortgage-backed, asset-backed and collateralized        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 71,270 67,421    
Allowance for credit losses (41) (69)    
Gross Unrealized Gains 1,151 1,050    
Gross Unrealized Losses (3,561) (3,833)    
Bonds available for sale 68,819 64,569    
RMBS        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 21,841 20,875    
Allowance for credit losses (24) (35)    
Gross Unrealized Gains 849 821    
Gross Unrealized Losses (1,245) (1,217)    
Bonds available for sale 21,421 20,444    
CMBS        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 15,563 15,379    
Allowance for credit losses (17) (34)    
Gross Unrealized Gains 68 46    
Gross Unrealized Losses (1,126) (1,263)    
Bonds available for sale 14,488 14,128    
CLO/ABS        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 33,866 31,167    
Allowance for credit losses 0 0    
Gross Unrealized Gains 234 183    
Gross Unrealized Losses (1,190) (1,353)    
Bonds available for sale $ 32,910 $ 29,997    
[1] See Note 10 for details of balances associated with variable interest entities.