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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
12 Months Ended
Dec. 31, 2023
USD ($)
Contract
Dec. 31, 2022
USD ($)
Contract
Total unrealized losses    
Fixed income securities $ 48,865 $ 42,485
U.S. government and agencies    
Less than 12 months    
Number of issues | Contract 63 112
Fair value $ 2,554 $ 4,900
Unrealized losses $ (38) $ (138)
12 months or more    
Number of issues | Contract 117 75
Fair value $ 2,513 $ 2,393
Unrealized losses (81) (93)
Total unrealized losses    
Total unrealized losses (119) (231)
Fixed income securities $ 8,619 $ 7,898
Municipal    
Less than 12 months    
Number of issues | Contract 271 3,015
Fair value $ 400 $ 3,944
Unrealized losses $ (4) $ (215)
12 months or more    
Number of issues | Contract 1,784 507
Fair value $ 2,245 $ 740
Unrealized losses (148) (111)
Total unrealized losses    
Total unrealized losses (152) (326)
Fixed income securities $ 6,006 $ 6,210
Corporate    
Less than 12 months    
Number of issues | Contract 251 2,085
Fair value $ 2,225 $ 18,072
Unrealized losses $ (48) $ (1,389)
12 months or more    
Number of issues | Contract 2,106 845
Fair value $ 17,319 $ 6,105
Unrealized losses (1,095) (956)
Total unrealized losses    
Total unrealized losses (1,143) (2,345)
Fixed income securities $ 31,205 $ 26,263
Foreign government    
Less than 12 months    
Number of issues | Contract 7 74
Fair value $ 31 $ 739
Unrealized losses $ 0 $ (22)
12 months or more    
Number of issues | Contract 75 42
Fair value $ 356 $ 200
Unrealized losses (13) (18)
Total unrealized losses    
Total unrealized losses (13) (40)
Fixed income securities $ 1,290 $ 957
ABS    
Less than 12 months    
Number of issues | Contract 19 194
Fair value $ 64 $ 874
Unrealized losses $ (1) $ (27)
12 months or more    
Number of issues | Contract 150 83
Fair value $ 584 $ 109
Unrealized losses (6) (8)
Total unrealized losses    
Total unrealized losses (7) (35)
Fixed income securities $ 1,745 $ 1,157
Fixed income securities    
Less than 12 months    
Number of issues | Contract 611 5,480
Fair value $ 5,274 $ 28,529
Unrealized losses $ (91) $ (1,791)
12 months or more    
Number of issues | Contract 4,232 1,552
Fair value $ 23,017 $ 9,547
Unrealized losses (1,343) (1,186)
Total unrealized losses    
Total unrealized losses (1,434) (2,977)
Fixed income securities 32 10
Fixed income securities, unrealized losses 3 5
Fixed income securities, credit loss allowance $ 8 $ 11
Investment grade fixed income securities    
Less than 12 months    
Number of issues | Contract 568 4,959
Fair value $ 5,061 $ 25,487
Unrealized losses $ (83) $ (1,409)
12 months or more    
Number of issues | Contract 3,864 1,437
Fair value $ 20,429 $ 8,791
Unrealized losses (1,151) (1,009)
Total unrealized losses    
Total unrealized losses $ (1,234) $ (2,418)
Below investment grade fixed income securities    
Less than 12 months    
Number of issues | Contract 43 521
Fair value $ 213 $ 3,042
Unrealized losses $ (8) $ (382)
12 months or more    
Number of issues | Contract 368 115
Fair value $ 2,588 $ 756
Unrealized losses (192) (177)
Total unrealized losses    
Total unrealized losses $ (200) $ (559)