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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, 2024
Dec. 31, 2023
Jun. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost $ 67,364 $ 68,119        
Allowance for credit losses (40) (34) $ (33) $ (30) $ (34) $ (37)
Gross Unrealized Gains 1,450 1,073        
Gross Unrealized Losses (2,794) (3,916)        
Bonds available for sale [1] 65,980 65,242        
Non-Investment Grade            
Debt Securities, Available-for-sale [Line Items]            
Bonds available for sale $ 3,100 $ 5,200        
Non-Investment Grade | Credit Concentration Risk | Bonds available for sale            
Debt Securities, Available-for-sale [Line Items]            
Concentration risk (as a percent) 5.00% 8.00%        
U.S. government and government sponsored entities            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost $ 4,488 $ 4,444        
Allowance for credit losses 0 0        
Gross Unrealized Gains 95 40        
Gross Unrealized Losses (69) (89)        
Bonds available for sale 4,514 4,395        
Obligations of states, municipalities and political subdivisions            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 4,661 4,930        
Allowance for credit losses 0 0        
Gross Unrealized Gains 87 60        
Gross Unrealized Losses (97) (157)        
Bonds available for sale 4,651 4,833        
Non-U.S. governments            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 9,187 8,973        
Allowance for credit losses (2) (1)        
Gross Unrealized Gains 92 94        
Gross Unrealized Losses (544) (670)        
Bonds available for sale 8,733 8,396        
Corporate debt            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 33,903 34,013        
Allowance for credit losses (25) (20)        
Gross Unrealized Gains 808 606        
Gross Unrealized Losses (1,652) (2,253)        
Bonds available for sale 33,034 32,346        
Mortgage-backed, asset-backed and collateralized            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 15,125 15,759        
Allowance for credit losses (13) (13)        
Gross Unrealized Gains 368 273        
Gross Unrealized Losses (432) (747)        
Bonds available for sale 15,048 15,272        
RMBS            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 6,462 6,423        
Allowance for credit losses (6) (9)        
Gross Unrealized Gains 256 219        
Gross Unrealized Losses (293) (426)        
Bonds available for sale 6,419 6,207        
CMBS            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 4,127 4,326        
Allowance for credit losses (7) (4)        
Gross Unrealized Gains 69 23        
Gross Unrealized Losses (83) (198)        
Bonds available for sale 4,106 4,147        
CLO/ABS            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 4,536 5,010        
Allowance for credit losses 0 0        
Gross Unrealized Gains 43 31        
Gross Unrealized Losses (56) (123)        
Bonds available for sale $ 4,523 $ 4,918        
[1] See Note 10 for details of balances associated with variable interest entities.