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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
Sep. 30, 2022
USD ($)
contract
Dec. 31, 2021
USD ($)
contract
U.S. government and agencies    
Less than 12 months    
Number of  issues | contract 137 112
Fair value $ 6,980 $ 5,451
Unrealized losses $ (231) $ (24)
12 months or more    
Number of  issues | contract 53 4
Fair value $ 1,428 $ 72
Unrealized losses (82) (2)
Total unrealized losses    
Total unrealized losses $ (313) $ (26)
Municipal    
Less than 12 months    
Number of  issues | contract 3,880 767
Fair value $ 5,508 $ 1,213
Unrealized losses $ (400) $ (15)
12 months or more    
Number of  issues | contract 289 2
Fair value $ 341 $ 14
Unrealized losses (61) (1)
Total unrealized losses    
Total unrealized losses $ (461) $ (16)
Corporate    
Less than 12 months    
Number of  issues | contract 2,611 1,197
Fair value $ 21,603 $ 9,725
Unrealized losses $ (2,305) $ (176)
12 months or more    
Number of  issues | contract 515 22
Fair value $ 2,879 $ 130
Unrealized losses (580) (16)
Total unrealized losses    
Total unrealized losses $ (2,885) $ (192)
Foreign government    
Less than 12 months    
Number of  issues | contract 80 51
Fair value $ 744 $ 415
Unrealized losses $ (27) $ (6)
12 months or more    
Number of  issues | contract 42 4
Fair value $ 141 $ 3
Unrealized losses (16) 0
Total unrealized losses    
Total unrealized losses $ (43) $ (6)
ABS    
Less than 12 months    
Number of  issues | contract 269 80
Fair value $ 1,484 $ 500
Unrealized losses $ (58) $ (2)
12 months or more    
Number of  issues | contract 62 53
Fair value $ 36 $ 8
Unrealized losses (5) 0
Total unrealized losses    
Total unrealized losses $ (63) $ (2)
Fixed income securities    
Less than 12 months    
Number of  issues | contract 6,977 2,207
Fair value $ 36,319 $ 17,304
Unrealized losses $ (3,021) $ (223)
12 months or more    
Number of  issues | contract 961 85
Fair value $ 4,825 $ 227
Unrealized losses (744) (19)
Total unrealized losses    
Total unrealized losses $ (3,765) $ (242)
Investment grade fixed income securities    
Less than 12 months    
Number of  issues | contract 6,313 1,993
Fair value $ 32,385 $ 15,391
Unrealized losses $ (2,346) $ (188)
12 months or more    
Number of  issues | contract 902 71
Fair value $ 4,474 $ 183
Unrealized losses (643) (8)
Total unrealized losses    
Total unrealized losses $ (2,989) $ (196)
Below investment grade fixed income securities    
Less than 12 months    
Number of  issues | contract 664 214
Fair value $ 3,934 $ 1,913
Unrealized losses $ (675) $ (35)
12 months or more    
Number of  issues | contract 59 14
Fair value $ 351 $ 44
Unrealized losses (101) (11)
Total unrealized losses    
Total unrealized losses $ (776) $ (46)