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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
Jun. 30, 2022
USD ($)
contract
Dec. 31, 2021
USD ($)
contract
U.S. government and agencies    
Less than 12 months    
Number of  issues | contract 149 112
Fair value $ 7,558 $ 5,451
Unrealized losses $ (127) $ (24)
12 months or more    
Number of  issues | contract 17 4
Fair value $ 279 $ 72
Unrealized losses (14) (2)
Total unrealized losses    
Total unrealized losses $ (141) $ (26)
Municipal    
Less than 12 months    
Number of  issues | contract 3,204 767
Fair value $ 4,089 $ 1,213
Unrealized losses $ (275) $ (15)
12 months or more    
Number of  issues | contract 50 2
Fair value $ 69 $ 14
Unrealized losses (9) (1)
Total unrealized losses    
Total unrealized losses $ (284) $ (16)
Corporate    
Less than 12 months    
Number of  issues | contract 2,758 1,197
Fair value $ 21,604 $ 9,725
Unrealized losses $ (2,065) $ (176)
12 months or more    
Number of  issues | contract 270 22
Fair value $ 1,183 $ 130
Unrealized losses (192) (16)
Total unrealized losses    
Total unrealized losses $ (2,257) $ (192)
Foreign government    
Less than 12 months    
Number of  issues | contract 93 51
Fair value $ 880 $ 415
Unrealized losses $ (37) $ (6)
12 months or more    
Number of  issues | contract 32 4
Fair value $ 86 $ 3
Unrealized losses (12) 0
Total unrealized losses    
Total unrealized losses $ (49) $ (6)
ABS    
Less than 12 months    
Number of  issues | contract 196 80
Fair value $ 1,471 $ 500
Unrealized losses $ (55) $ (2)
12 months or more    
Number of  issues | contract 58 53
Fair value $ 19 $ 8
Unrealized losses (2) 0
Total unrealized losses    
Total unrealized losses $ (57) $ (2)
Fixed income securities    
Less than 12 months    
Number of  issues | contract 6,400 2,207
Fair value $ 35,602 $ 17,304
Unrealized losses $ (2,559) $ (223)
12 months or more    
Number of  issues | contract 427 85
Fair value $ 1,636 $ 227
Unrealized losses (229) (19)
Total unrealized losses    
Total unrealized losses $ (2,788) $ (242)
Investment grade fixed income securities    
Less than 12 months    
Number of  issues | contract 5,675 1,993
Fair value $ 31,222 $ 15,391
Unrealized losses $ (1,814) $ (188)
12 months or more    
Number of  issues | contract 402 71
Fair value $ 1,556 $ 183
Unrealized losses (204) (8)
Total unrealized losses    
Total unrealized losses $ (2,018) $ (196)
Below investment grade fixed income securities    
Less than 12 months    
Number of  issues | contract 725 214
Fair value $ 4,380 $ 1,913
Unrealized losses $ (745) $ (35)
12 months or more    
Number of  issues | contract 25 14
Fair value $ 80 $ 44
Unrealized losses (25) (11)
Total unrealized losses    
Total unrealized losses $ (770) $ (46)