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Investment Information - Summary of available for sale securities (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value $ 22,245 $ 21,015    
Gross Unrealized Gains 124 90    
Gross Unrealized Losses (1,298) (1,649)    
Allowance for Expected Credit Losses (56) (41)    
Cost or Amortized Cost 23,475 22,615    
Fixed maturities        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 20,692 19,683    
Gross Unrealized Gains 123 89    
Gross Unrealized Losses (1,297) (1,647)    
Allowance for Expected Credit Losses (56) (41) $ (34) $ (3)
Cost or Amortized Cost 21,922 21,282    
Short-term investments        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 1,553 1,332    
Gross Unrealized Gains 1 1    
Gross Unrealized Losses (1) (2)    
Allowance for Expected Credit Losses 0 0    
Cost or Amortized Cost 1,553 1,333    
Corporate bonds | Fixed maturities        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 9,409 8,020    
Gross Unrealized Gains 84 55    
Gross Unrealized Losses (636) (781)    
Allowance for Expected Credit Losses (45) (30) (27) (2)
Cost or Amortized Cost 10,006 8,776    
Residential mortgage backed securities | Fixed maturities        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 823 795    
Gross Unrealized Gains 6 5    
Gross Unrealized Losses (74) (87)    
Allowance for Expected Credit Losses 0 0    
Cost or Amortized Cost 891 877    
Municipal bonds | Fixed maturities        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 314 419    
Gross Unrealized Gains 2 3    
Gross Unrealized Losses (24) (33)    
Allowance for Expected Credit Losses 0 0    
Cost or Amortized Cost 336 449    
Commercial mortgage backed securities | Fixed maturities        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 1,035 1,047    
Gross Unrealized Gains 1 1    
Gross Unrealized Losses (54) (58)    
Allowance for Expected Credit Losses (2) (3)    
Cost or Amortized Cost 1,090 1,107    
U.S. government and government agencies | Fixed maturities        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 4,563 5,162    
Gross Unrealized Gains 14 15    
Gross Unrealized Losses (234) (343)    
Allowance for Expected Credit Losses 0 0    
Cost or Amortized Cost 4,783 5,490    
Non-U.S. government securities | Fixed maturities        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 2,187 2,313    
Gross Unrealized Gains 13 9    
Gross Unrealized Losses (178) (238)    
Allowance for Expected Credit Losses (3) (2) $ 0 $ 0
Cost or Amortized Cost 2,355 2,544    
Asset backed securities | Fixed maturities        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value 2,361 1,927    
Gross Unrealized Gains 3 1    
Gross Unrealized Losses (97) (107)    
Allowance for Expected Credit Losses (6) (6)    
Cost or Amortized Cost $ 2,461 $ 2,039