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Investment Information - Summary of available for sale securities (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value $ 31,275 $ 29,819    
Gross Unrealized Gains 254 181    
Gross Unrealized Losses (475) (694)    
Allowance for Expected Credit Losses (21) (22)    
Cost or Amortized Cost 31,517 30,354    
Fixed maturities        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 28,798 27,035    
Gross Unrealized Gains 252 179    
Gross Unrealized Losses (474) (692)    
Allowance for Expected Credit Losses (21) (22) $ (32) $ (28)
Cost or Amortized Cost 29,041 27,570    
Corporate bonds        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 13,703 12,487    
Gross Unrealized Gains 153 110    
Gross Unrealized Losses (267) (346)    
Allowance for Expected Credit Losses (12) (12) (24) (20)
Cost or Amortized Cost 13,829 12,735    
U.S. government and government agencies        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 6,531 6,710    
Gross Unrealized Gains 36 8    
Gross Unrealized Losses (53) (149)    
Allowance for Expected Credit Losses 0 0    
Cost or Amortized Cost 6,548 6,851    
Asset backed securities        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 3,087 2,900    
Gross Unrealized Gains 11 19    
Gross Unrealized Losses (30) (32)    
Allowance for Expected Credit Losses (8) (8)    
Cost or Amortized Cost 3,114 2,921    
Non-U.S. government securities        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 2,602 2,538    
Gross Unrealized Gains 31 30    
Gross Unrealized Losses (81) (107)    
Allowance for Expected Credit Losses (1) (1) $ (1) $ (1)
Cost or Amortized Cost 2,653 2,616    
Commercial mortgage backed securities        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 931 1,058    
Gross Unrealized Gains 5 6    
Gross Unrealized Losses (9) (11)    
Allowance for Expected Credit Losses 0 (1)    
Cost or Amortized Cost 935 1,064    
Residential mortgage backed securities        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 1,755 1,079    
Gross Unrealized Gains 16 6    
Gross Unrealized Losses (26) (31)    
Allowance for Expected Credit Losses 0 0    
Cost or Amortized Cost 1,765 1,104    
Municipal bonds        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 189 263    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses (8) (16)    
Allowance for Expected Credit Losses 0 0    
Cost or Amortized Cost 197 279    
Short-term investments        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 2,477 2,784    
Gross Unrealized Gains 2 2    
Gross Unrealized Losses (1) (2)    
Allowance for Expected Credit Losses 0 0    
Cost or Amortized Cost $ 2,476 $ 2,784