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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost $ 66,195 $ 68,119    
Allowance for credit losses (38) (34) $ (37) $ (21)
Gross Unrealized Gains 962 1,073    
Gross Unrealized Losses (3,113) (3,916)    
Bonds available for sale [1] 64,006 65,242    
Non-Investment Grade        
Debt Securities, Available-for-sale [Line Items]        
Bonds available for sale $ 3,600 $ 5,200    
Non-Investment Grade | Credit Concentration Risk | Bonds available for sale        
Debt Securities, Available-for-sale [Line Items]        
Concentration risk (as a percent) 6.00% 8.00%    
U.S. government and government sponsored entities        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost $ 3,346 $ 4,444    
Allowance for credit losses 0 0    
Gross Unrealized Gains 20 40    
Gross Unrealized Losses (99) (89)    
Bonds available for sale 3,267 4,395    
Obligations of states, municipalities and political subdivisions        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 3,223 4,930    
Allowance for credit losses 0 0    
Gross Unrealized Gains 32 60    
Gross Unrealized Losses (112) (157)    
Bonds available for sale 3,143 4,833    
Non-U.S. governments        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 8,644 8,973    
Allowance for credit losses (1) (1)    
Gross Unrealized Gains 54 94    
Gross Unrealized Losses (590) (670)    
Bonds available for sale 8,107 8,396    
Corporate debt        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 33,031 34,013    
Allowance for credit losses (28) (20)    
Gross Unrealized Gains 581 606    
Gross Unrealized Losses (1,758) (2,253)    
Bonds available for sale 31,826 32,346    
Mortgage-backed, asset-backed and collateralized        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 17,951 15,759    
Allowance for credit losses (9) (13)    
Gross Unrealized Gains 275 273    
Gross Unrealized Losses (554) (747)    
Bonds available for sale 17,663 15,272    
RMBS        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 8,820 6,423    
Allowance for credit losses (6) (9)    
Gross Unrealized Gains 209 219    
Gross Unrealized Losses (419) (426)    
Bonds available for sale 8,604 6,207    
CMBS        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 3,988 4,326    
Allowance for credit losses (3) (4)    
Gross Unrealized Gains 32 23    
Gross Unrealized Losses (91) (198)    
Bonds available for sale 3,926 4,147    
CLO/ABS        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 5,143 5,010    
Allowance for credit losses 0 0    
Gross Unrealized Gains 34 31    
Gross Unrealized Losses (44) (123)    
Bonds available for sale $ 5,133 $ 4,918    
[1] See Note 10 for details of balances associated with variable interest entities.