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Investment Information - Summary of available for sale securities (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]            
Estimated Fair Value $ 23,136   $ 21,015      
Gross Unrealized Gains 89   90      
Gross Unrealized Losses (1,332)   (1,649)      
Allowance for Expected Credit Losses (61)   (41)      
Cost or Amortized Cost 24,440   22,615      
Fixed maturities            
Debt Securities, Available-for-sale [Line Items]            
Estimated Fair Value 21,434   19,683      
Gross Unrealized Gains 87   89      
Gross Unrealized Losses (1,331)   (1,647)      
Allowance for Expected Credit Losses (61) $ (56) (41) $ (59) $ (34) $ (3)
Cost or Amortized Cost 22,739   21,282      
Short-term investments            
Debt Securities, Available-for-sale [Line Items]            
Estimated Fair Value 1,702   1,332      
Gross Unrealized Gains 2   1      
Gross Unrealized Losses (1)   (2)      
Allowance for Expected Credit Losses 0   0      
Cost or Amortized Cost 1,701   1,333      
Corporate bonds | Fixed maturities            
Debt Securities, Available-for-sale [Line Items]            
Estimated Fair Value 9,977   8,020      
Gross Unrealized Gains 54   55      
Gross Unrealized Losses (693)   (781)      
Allowance for Expected Credit Losses (50) (45) (30) (40) (27) (2)
Cost or Amortized Cost 10,666   8,776      
Residential mortgage backed securities | Fixed maturities            
Debt Securities, Available-for-sale [Line Items]            
Estimated Fair Value 860   795      
Gross Unrealized Gains 3   5      
Gross Unrealized Losses (87)   (87)      
Allowance for Expected Credit Losses 0   0      
Cost or Amortized Cost 944   877      
Municipal bonds | Fixed maturities            
Debt Securities, Available-for-sale [Line Items]            
Estimated Fair Value 306   419      
Gross Unrealized Gains 1   3      
Gross Unrealized Losses (27)   (33)      
Allowance for Expected Credit Losses 0   0      
Cost or Amortized Cost 332   449      
Commercial mortgage backed securities | Fixed maturities            
Debt Securities, Available-for-sale [Line Items]            
Estimated Fair Value 1,082   1,047      
Gross Unrealized Gains 0   1      
Gross Unrealized Losses (49)   (58)      
Allowance for Expected Credit Losses (2)   (3)      
Cost or Amortized Cost 1,133   1,107      
U.S. government and government agencies | Fixed maturities            
Debt Securities, Available-for-sale [Line Items]            
Estimated Fair Value 4,529   5,162      
Gross Unrealized Gains 4   15      
Gross Unrealized Losses (176)   (343)      
Allowance for Expected Credit Losses 0   0      
Cost or Amortized Cost 4,701   5,490      
Non-U.S. government securities | Fixed maturities            
Debt Securities, Available-for-sale [Line Items]            
Estimated Fair Value 2,277   2,313      
Gross Unrealized Gains 20   9      
Gross Unrealized Losses (204)   (238)      
Allowance for Expected Credit Losses (3) $ (3) (2) $ 0 $ 0 $ 0
Cost or Amortized Cost 2,464   2,544      
Asset backed securities | Fixed maturities            
Debt Securities, Available-for-sale [Line Items]            
Estimated Fair Value 2,403   1,927      
Gross Unrealized Gains 5   1      
Gross Unrealized Losses (95)   (107)      
Allowance for Expected Credit Losses (6)   (6)      
Cost or Amortized Cost $ 2,499   $ 2,039