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Investment Information - Summary of available for sale securities (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Fixed maturities:      
Estimated fair value $ 35,051 $ 29,819  
Gross Unrealized Gains 408 181  
Gross Unrealized Losses (290) (694)  
Allowance for Expected Credit Losses (20) (22)  
Cost or Amortized Cost 34,953 30,354  
Fixed maturities available for sale, at fair value      
Fixed maturities:      
Estimated fair value 32,426 27,035  
Gross Unrealized Gains 406 179  
Gross Unrealized Losses (289) (692)  
Allowance for Expected Credit Losses (20) (22) $ (28)
Cost or Amortized Cost 32,329 27,570  
Corporate bonds      
Fixed maturities:      
Estimated fair value 14,058 12,487  
Gross Unrealized Gains 265 110  
Gross Unrealized Losses (142) (346)  
Allowance for Expected Credit Losses (10) (12)  
Cost or Amortized Cost 13,945 12,735  
US government and government agencies      
Fixed maturities:      
Estimated fair value 7,445 6,710  
Gross Unrealized Gains 23 8  
Gross Unrealized Losses (21) (149)  
Allowance for Expected Credit Losses 0 0  
Cost or Amortized Cost 7,443 6,851  
Asset backed securities      
Fixed maturities:      
Estimated fair value 3,574 2,900  
Gross Unrealized Gains 20 19  
Gross Unrealized Losses (15) (32)  
Allowance for Expected Credit Losses (8) (8)  
Cost or Amortized Cost 3,577 2,921  
Non-US government securities      
Fixed maturities:      
Estimated fair value 3,270 2,538  
Gross Unrealized Gains 53 30  
Gross Unrealized Losses (81) (107)  
Allowance for Expected Credit Losses (1) (1) $ (1)
Cost or Amortized Cost 3,299 2,616  
Residential mortgage backed securities      
Fixed maturities:      
Estimated fair value 2,705 1,079  
Gross Unrealized Gains 34 6  
Gross Unrealized Losses (21) (31)  
Allowance for Expected Credit Losses 0 0  
Cost or Amortized Cost 2,692 1,104  
Commercial mortgage backed securities      
Fixed maturities:      
Estimated fair value 1,212 1,058  
Gross Unrealized Gains 11 6  
Gross Unrealized Losses (5) (11)  
Allowance for Expected Credit Losses (1) (1)  
Cost or Amortized Cost 1,207 1,064  
Municipal bonds      
Fixed maturities:      
Estimated fair value 162 263  
Gross Unrealized Gains 0 0  
Gross Unrealized Losses (4) (16)  
Allowance for Expected Credit Losses 0 0  
Cost or Amortized Cost 166 279  
Short-term investments      
Fixed maturities:      
Estimated fair value 2,625 2,784  
Gross Unrealized Gains 2 2  
Gross Unrealized Losses (1) (2)  
Allowance for Expected Credit Losses 0 0  
Cost or Amortized Cost $ 2,624 $ 2,784