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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, 2023
USD ($)
contract
Dec. 31, 2022
USD ($)
contract
U.S. government and agencies    
Less than 12 months    
Number of  issues | contract 70 112
Fair value $ 2,576 $ 4,900
Unrealized losses $ (41) $ (138)
12 months or more    
Number of  issues | contract 104 75
Fair value $ 3,216 $ 2,393
Unrealized losses (111) (93)
Total unrealized losses    
Total unrealized losses $ (152) $ (231)
Municipal    
Less than 12 months    
Number of  issues | contract 1,183 3,015
Fair value $ 1,632 $ 3,944
Unrealized losses $ (27) $ (215)
12 months or more    
Number of  issues | contract 1,860 507
Fair value $ 2,376 $ 740
Unrealized losses (213) (111)
Total unrealized losses    
Total unrealized losses $ (240) $ (326)
Corporate    
Less than 12 months    
Number of  issues | contract 970 2,085
Fair value $ 8,673 $ 18,072
Unrealized losses $ (286) $ (1,389)
12 months or more    
Number of  issues | contract 1,777 845
Fair value $ 14,543 $ 6,105
Unrealized losses (1,501) (956)
Total unrealized losses    
Total unrealized losses $ (1,787) $ (2,345)
Foreign government    
Less than 12 months    
Number of  issues | contract 15 74
Fair value $ 197 $ 739
Unrealized losses $ (1) $ (22)
12 months or more    
Number of  issues | contract 87 42
Fair value $ 452 $ 200
Unrealized losses (23) (18)
Total unrealized losses    
Total unrealized losses $ (24) $ (40)
ABS    
Less than 12 months    
Number of  issues | contract 74 194
Fair value $ 160 $ 874
Unrealized losses $ (5) $ (27)
12 months or more    
Number of  issues | contract 152 83
Fair value $ 669 $ 109
Unrealized losses (20) (8)
Total unrealized losses    
Total unrealized losses $ (25) $ (35)
Fixed income securities    
Less than 12 months    
Number of  issues | contract 2,312 5,480
Fair value $ 13,238 $ 28,529
Unrealized losses $ (360) $ (1,791)
12 months or more    
Number of  issues | contract 3,980 1,552
Fair value $ 21,256 $ 9,547
Unrealized losses (1,868) (1,186)
Total unrealized losses    
Total unrealized losses $ (2,228) $ (2,977)
Investment grade fixed income securities    
Less than 12 months    
Number of  issues | contract 2,132 4,959
Fair value $ 12,415 $ 25,487
Unrealized losses $ (313) $ (1,409)
12 months or more    
Number of  issues | contract 3,601 1,437
Fair value $ 18,633 $ 8,791
Unrealized losses (1,509) (1,009)
Total unrealized losses    
Total unrealized losses $ (1,822) $ (2,418)
Below investment grade fixed income securities    
Less than 12 months    
Number of  issues | contract 180 521
Fair value $ 823 $ 3,042
Unrealized losses $ (47) $ (382)
12 months or more    
Number of  issues | contract 379 115
Fair value $ 2,623 $ 756
Unrealized losses (359) (177)
Total unrealized losses    
Total unrealized losses $ (406) $ (559)