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Investments - Gross unrealized losses and fair value by the type and length of time held in continuous unrealized loss position (Details)
$ in Millions
Dec. 31, 2022
USD ($)
Contract
Dec. 31, 2021
USD ($)
Contract
U.S. government and agencies    
Less than 12 months    
Number of issues | Contract 112 112
Fair value $ 4,900 $ 5,451
Unrealized losses $ (138) $ (24)
12 months or more    
Number of issues | Contract 75 4
Fair value $ 2,393 $ 72
Unrealized losses (93) (2)
Total unrealized losses    
Total unrealized losses $ (231) $ (26)
Municipal    
Less than 12 months    
Number of issues | Contract 3,015 767
Fair value $ 3,944 $ 1,213
Unrealized losses $ (215) $ (15)
12 months or more    
Number of issues | Contract 507 2
Fair value $ 740 $ 14
Unrealized losses (111) (1)
Total unrealized losses    
Total unrealized losses $ (326) $ (16)
Corporate    
Less than 12 months    
Number of issues | Contract 2,085 1,197
Fair value $ 18,072 $ 9,725
Unrealized losses $ (1,389) $ (176)
12 months or more    
Number of issues | Contract 845 22
Fair value $ 6,105 $ 130
Unrealized losses (956) (16)
Total unrealized losses    
Total unrealized losses $ (2,345) $ (192)
Foreign government    
Less than 12 months    
Number of issues | Contract 74 51
Fair value $ 739 $ 415
Unrealized losses $ (22) $ (6)
12 months or more    
Number of issues | Contract 42 4
Fair value $ 200 $ 3
Unrealized losses (18) 0
Total unrealized losses    
Total unrealized losses $ (40) $ (6)
ABS    
Less than 12 months    
Number of issues | Contract 194 80
Fair value $ 874 $ 500
Unrealized losses $ (27) $ (2)
12 months or more    
Number of issues | Contract 83 53
Fair value $ 109 $ 8
Unrealized losses (8) 0
Total unrealized losses    
Total unrealized losses $ (35) $ (2)
Fixed income securities    
Less than 12 months    
Number of issues | Contract 5,480 2,207
Fair value $ 28,529 $ 17,304
Unrealized losses $ (1,791) $ (223)
12 months or more    
Number of issues | Contract 1,552 85
Fair value $ 9,547 $ 227
Unrealized losses (1,186) (19)
Total unrealized losses    
Total unrealized losses $ (2,977) $ (242)
Investment grade fixed income securities    
Less than 12 months    
Number of issues | Contract 4,959 1,993
Fair value $ 25,487 $ 15,391
Unrealized losses $ (1,409) $ (188)
12 months or more    
Number of issues | Contract 1,437 71
Fair value $ 8,791 $ 183
Unrealized losses (1,009) (8)
Total unrealized losses    
Total unrealized losses $ (2,418) $ (196)
Below investment grade fixed income securities    
Less than 12 months    
Number of issues | Contract 521 214
Fair value $ 3,042 $ 1,913
Unrealized losses $ (382) $ (35)
12 months or more    
Number of issues | Contract 115 14
Fair value $ 756 $ 44
Unrealized losses (177) (11)
Total unrealized losses    
Total unrealized losses $ (559) $ (46)