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Investment Information - Summary of available for sale securities (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value $ 25,770 $ 25,616    
Gross Unrealized Gains 149 276    
Gross Unrealized Losses (828) (827)    
Allowance for Expected Credit Losses (32) (28)    
Cost or Amortized Cost 26,481 26,195    
Fixed maturities        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 23,628 23,553    
Gross Unrealized Gains 147 275    
Gross Unrealized Losses (825) (825)    
Allowance for Expected Credit Losses (32) (28) $ (56) $ (41)
Cost or Amortized Cost 24,338 24,131    
Corporate bonds        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 11,698 10,855    
Gross Unrealized Gains 98 157    
Gross Unrealized Losses (442) (464)    
Allowance for Expected Credit Losses (24) (20) (45) (30)
Cost or Amortized Cost 12,066 11,182    
U.S. government and government agencies        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 4,370 5,814    
Gross Unrealized Gains 6 63    
Gross Unrealized Losses (109) (86)    
Allowance for Expected Credit Losses 0 0    
Cost or Amortized Cost 4,473 5,837    
Asset backed securities        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 2,762 2,250    
Gross Unrealized Gains 15 11    
Gross Unrealized Losses (44) (55)    
Allowance for Expected Credit Losses (5) (5)    
Cost or Amortized Cost 2,796 2,299    
Non-U.S. government securities        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 2,195 2,062    
Gross Unrealized Gains 20 33    
Gross Unrealized Losses (113) (100)    
Allowance for Expected Credit Losses (1) (1) $ (3) $ (2)
Cost or Amortized Cost 2,289 2,130    
Commercial mortgage backed securities        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 1,197 1,213    
Gross Unrealized Gains 3 3    
Gross Unrealized Losses (30) (34)    
Allowance for Expected Credit Losses (2) (2)    
Cost or Amortized Cost 1,226 1,246    
Residential mortgage backed securities        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 1,179 1,103    
Gross Unrealized Gains 4 7    
Gross Unrealized Losses (69) (66)    
Allowance for Expected Credit Losses 0 0    
Cost or Amortized Cost 1,244 1,162    
Municipal bonds        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 227 256    
Gross Unrealized Gains 1 1    
Gross Unrealized Losses (18) (20)    
Allowance for Expected Credit Losses 0 0    
Cost or Amortized Cost 244 275    
Short-term investments        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 2,142 2,063    
Gross Unrealized Gains 2 1    
Gross Unrealized Losses (3) (2)    
Allowance for Expected Credit Losses 0 0    
Cost or Amortized Cost $ 2,143 $ 2,064