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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
Mar. 31, 2022
USD ($)
contract
Dec. 31, 2021
USD ($)
contract
U.S. government and agencies    
Less than 12 months    
Number of  issues | contract 140 112
Fair value $ 5,954 $ 5,451
Unrealized losses $ (119) $ (24)
12 months or more    
Number of  issues | contract 18 4
Fair value $ 247 $ 72
Unrealized losses (12) (2)
Total unrealized losses    
Total unrealized losses $ (131) $ (26)
Municipal    
Less than 12 months    
Number of  issues | contract 2,523 767
Fair value $ 3,145 $ 1,213
Unrealized losses $ (155) $ (15)
12 months or more    
Number of  issues | contract 49 2
Fair value $ 68 $ 14
Unrealized losses (6) (1)
Total unrealized losses    
Total unrealized losses $ (161) $ (16)
Corporate    
Less than 12 months    
Number of  issues | contract 2,177 1,197
Fair value $ 18,250 $ 9,725
Unrealized losses $ (988) $ (176)
12 months or more    
Number of  issues | contract 281 22
Fair value $ 1,170 $ 130
Unrealized losses (130) (16)
Total unrealized losses    
Total unrealized losses $ (1,118) $ (192)
Foreign government    
Less than 12 months    
Number of  issues | contract 87 51
Fair value $ 922 $ 415
Unrealized losses $ (29) $ (6)
12 months or more    
Number of  issues | contract 34 4
Fair value $ 116 $ 3
Unrealized losses (11) 0
Total unrealized losses    
Total unrealized losses $ (40) $ (6)
ABS    
Less than 12 months    
Number of  issues | contract 175 80
Fair value $ 1,917 $ 500
Unrealized losses $ (21) $ (2)
12 months or more    
Number of  issues | contract 56 53
Fair value $ 11 $ 8
Unrealized losses 0 0
Total unrealized losses    
Total unrealized losses $ (21) $ (2)
Fixed income securities    
Less than 12 months    
Number of  issues | contract 5,102 2,207
Fair value $ 30,188 $ 17,304
Unrealized losses $ (1,312) $ (223)
12 months or more    
Number of  issues | contract 438 85
Fair value $ 1,612 $ 227
Unrealized losses (159) (19)
Total unrealized losses    
Total unrealized losses $ (1,471) $ (242)
Investment grade fixed income securities    
Less than 12 months    
Number of  issues | contract 4,498 1,993
Fair value $ 25,027 $ 15,391
Unrealized losses $ (1,014) $ (188)
12 months or more    
Number of  issues | contract 421 71
Fair value $ 1,554 $ 183
Unrealized losses (148) (8)
Total unrealized losses    
Total unrealized losses $ (1,162) $ (196)
Below investment grade fixed income securities    
Less than 12 months    
Number of  issues | contract 604 214
Fair value $ 5,161 $ 1,913
Unrealized losses $ (298) $ (35)
12 months or more    
Number of  issues | contract 17 14
Fair value $ 58 $ 44
Unrealized losses (11) (11)
Total unrealized losses    
Total unrealized losses $ (309) $ (46)