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Investments - Schedule of Gross Unrealized Losses and Fair Value by Type and Length of Time Held in a Continuous Unrealized Loss Position (Details)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
contract
Dec. 31, 2022
USD ($)
contract
Total unrealized losses    
Fixed income securities $ 46,771 $ 42,485
U.S. government and agencies    
Less than 12 months    
Number of  issues | contract 119 112
Fair value $ 4,868 $ 4,900
Unrealized losses $ (234) $ (138)
12 months or more    
Number of  issues | contract 128 75
Fair value $ 3,289 $ 2,393
Unrealized losses (151) (93)
Total unrealized losses    
Total unrealized losses (385) (231)
Fixed income securities $ 8,245 $ 7,898
Municipal    
Less than 12 months    
Number of  issues | contract 1,713 3,015
Fair value $ 3,644 $ 3,944
Unrealized losses $ (158) $ (215)
12 months or more    
Number of  issues | contract 2,057 507
Fair value $ 2,710 $ 740
Unrealized losses (305) (111)
Total unrealized losses    
Total unrealized losses (463) (326)
Fixed income securities $ 6,584 $ 6,210
Corporate    
Less than 12 months    
Number of  issues | contract 1,112 2,085
Fair value $ 10,982 $ 18,072
Unrealized losses $ (501) $ (1,389)
12 months or more    
Number of  issues | contract 2,200 845
Fair value $ 17,584 $ 6,105
Unrealized losses (1,816) (956)
Total unrealized losses    
Total unrealized losses (2,317) (2,345)
Fixed income securities $ 29,706 $ 26,263
Foreign government    
Less than 12 months    
Number of  issues | contract 68 74
Fair value $ 734 $ 739
Unrealized losses $ (27) $ (22)
12 months or more    
Number of  issues | contract 89 42
Fair value $ 397 $ 200
Unrealized losses (34) (18)
Total unrealized losses    
Total unrealized losses (61) (40)
Fixed income securities $ 1,135 $ 957
ABS    
Less than 12 months    
Number of  issues | contract 90 194
Fair value $ 57 $ 874
Unrealized losses $ 0 $ (27)
12 months or more    
Number of  issues | contract 170 83
Fair value $ 738 $ 109
Unrealized losses (11) (8)
Total unrealized losses    
Total unrealized losses (11) (35)
Fixed income securities $ 1,101 $ 1,157
Fixed income securities    
Less than 12 months    
Number of  issues | contract 3,102 5,480
Fair value $ 20,285 $ 28,529
Unrealized losses $ (920) $ (1,791)
12 months or more    
Number of  issues | contract 4,644 1,552
Fair value $ 24,718 $ 9,547
Unrealized losses (2,317) (1,186)
Total unrealized losses    
Total unrealized losses (3,237) (2,977)
Fixed income securities 37 10
Fixed income securities, unrealized losses 7 5
Fixed income securities, credit loss allowance $ 15 $ 11
Investment grade fixed income securities    
Less than 12 months    
Number of  issues | contract 2,954 4,959
Fair value $ 19,517 $ 25,487
Unrealized losses $ (895) $ (1,409)
12 months or more    
Number of  issues | contract 4,216 1,437
Fair value $ 21,946 $ 8,791
Unrealized losses (1,936) (1,009)
Total unrealized losses    
Total unrealized losses $ (2,831) $ (2,418)
Below investment grade fixed income securities    
Less than 12 months    
Number of  issues | contract 148 521
Fair value $ 768 $ 3,042
Unrealized losses $ (25) $ (382)
12 months or more    
Number of  issues | contract 428 115
Fair value $ 2,772 $ 756
Unrealized losses (381) (177)
Total unrealized losses    
Total unrealized losses $ (406) $ (559)