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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, 2023
USD ($)
contract
Dec. 31, 2022
USD ($)
contract
U.S. government and agencies    
Less than 12 months    
Number of  issues | contract 111 112
Fair value $ 4,297 $ 4,900
Unrealized losses $ (99) $ (138)
12 months or more    
Number of  issues | contract 107 75
Fair value $ 2,971 $ 2,393
Unrealized losses (132) (93)
Total unrealized losses    
Total unrealized losses $ (231) $ (231)
Municipal    
Less than 12 months    
Number of  issues | contract 1,432 3,015
Fair value $ 2,543 $ 3,944
Unrealized losses $ (35) $ (215)
12 months or more    
Number of  issues | contract 1,857 507
Fair value $ 2,391 $ 740
Unrealized losses (228) (111)
Total unrealized losses    
Total unrealized losses $ (263) $ (326)
Corporate    
Less than 12 months    
Number of  issues | contract 926 2,085
Fair value $ 9,291 $ 18,072
Unrealized losses $ (261) $ (1,389)
12 months or more    
Number of  issues | contract 2,028 845
Fair value $ 16,295 $ 6,105
Unrealized losses (1,649) (956)
Total unrealized losses    
Total unrealized losses $ (1,910) $ (2,345)
Foreign government    
Less than 12 months    
Number of  issues | contract 41 74
Fair value $ 671 $ 739
Unrealized losses $ (10) $ (22)
12 months or more    
Number of  issues | contract 87 42
Fair value $ 333 $ 200
Unrealized losses (21) (18)
Total unrealized losses    
Total unrealized losses $ (31) $ (40)
ABS    
Less than 12 months    
Number of  issues | contract 94 194
Fair value $ 82 $ 874
Unrealized losses $ (3) $ (27)
12 months or more    
Number of  issues | contract 173 83
Fair value $ 747 $ 109
Unrealized losses (19) (8)
Total unrealized losses    
Total unrealized losses $ (22) $ (35)
Fixed income securities    
Less than 12 months    
Number of  issues | contract 2,604 5,480
Fair value $ 16,884 $ 28,529
Unrealized losses $ (408) $ (1,791)
12 months or more    
Number of  issues | contract 4,252 1,552
Fair value $ 22,737 $ 9,547
Unrealized losses (2,049) (1,186)
Total unrealized losses    
Total unrealized losses $ (2,457) $ (2,977)
Investment grade fixed income securities    
Less than 12 months    
Number of  issues | contract 2,486 4,959
Fair value $ 16,370 $ 25,487
Unrealized losses $ (388) $ (1,409)
12 months or more    
Number of  issues | contract 3,827 1,437
Fair value $ 19,841 $ 8,791
Unrealized losses (1,678) (1,009)
Total unrealized losses    
Total unrealized losses $ (2,066) $ (2,418)
Below investment grade fixed income securities    
Less than 12 months    
Number of  issues | contract 118 521
Fair value $ 514 $ 3,042
Unrealized losses $ (20) $ (382)
12 months or more    
Number of  issues | contract 425 115
Fair value $ 2,896 $ 756
Unrealized losses (371) (177)
Total unrealized losses    
Total unrealized losses $ (391) $ (559)