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Investments - Unrealized Loss Position (Details)
$ in Millions
Dec. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Number of Securities    
Number of Securities, Less than 12 months | security 1,182 9,500
Number of Securities, Greater than 12 months | security 7,018 2,784
Number of Securities | security 8,200 12,284
Fair Value    
Fair Value, Less than 12 months $ 1,932 $ 14,228
Fair Value, Greater than 12 months 10,616 4,264
Fair Value 12,548 18,492
Unrealized Losses    
Unrealized Losses, Less than 12 months 28 1,226
Unrealized Losses, Greater than 12 months 808 614
Unrealized Losses $ 836 $ 1,840
U.S. government securities    
Number of Securities    
Number of Securities, Less than 12 months | security 74 519
Number of Securities, Greater than 12 months | security 280 35
Number of Securities | security 354 554
Fair Value    
Fair Value, Less than 12 months $ 194 $ 1,620
Fair Value, Greater than 12 months 891 191
Fair Value 1,085 1,811
Unrealized Losses    
Unrealized Losses, Less than 12 months 2 164
Unrealized Losses, Greater than 12 months 52 18
Unrealized Losses $ 54 $ 182
States, municipalities and political subdivisions    
Number of Securities    
Number of Securities, Less than 12 months | security 95 859
Number of Securities, Greater than 12 months | security 455 196
Number of Securities | security 550 1,055
Fair Value    
Fair Value, Less than 12 months $ 181 $ 1,370
Fair Value, Greater than 12 months 733 322
Fair Value 914 1,692
Unrealized Losses    
Unrealized Losses, Less than 12 months 1 95
Unrealized Losses, Greater than 12 months 34 34
Unrealized Losses $ 35 $ 129
U.S. corporate securities    
Number of Securities    
Number of Securities, Less than 12 months | security 576 5,193
Number of Securities, Greater than 12 months | security 4,120 1,479
Number of Securities | security 4,696 6,672
Fair Value    
Fair Value, Less than 12 months $ 672 $ 6,537
Fair Value, Greater than 12 months 5,602 1,822
Fair Value 6,274 8,359
Unrealized Losses    
Unrealized Losses, Less than 12 months 14 622
Unrealized Losses, Greater than 12 months 432 281
Unrealized Losses $ 446 $ 903
Foreign securities    
Number of Securities    
Number of Securities, Less than 12 months | security 160 1,168
Number of Securities, Greater than 12 months | security 964 403
Number of Securities | security 1,124 1,571
Fair Value    
Fair Value, Less than 12 months $ 243 $ 1,715
Fair Value, Greater than 12 months 1,407 592
Fair Value 1,650 2,307
Unrealized Losses    
Unrealized Losses, Less than 12 months 4 147
Unrealized Losses, Greater than 12 months 118 97
Unrealized Losses $ 122 $ 244
Residential mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 33 452
Number of Securities, Greater than 12 months | security 461 91
Number of Securities | security 494 543
Fair Value    
Fair Value, Less than 12 months $ 97 $ 464
Fair Value, Greater than 12 months 517 257
Fair Value 614 721
Unrealized Losses    
Unrealized Losses, Less than 12 months 1 39
Unrealized Losses, Greater than 12 months 59 50
Unrealized Losses $ 60 $ 89
Commercial mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 44 288
Number of Securities, Greater than 12 months | security 287 187
Number of Securities | security 331 475
Fair Value    
Fair Value, Less than 12 months $ 94 $ 611
Fair Value, Greater than 12 months 581 381
Fair Value 675 992
Unrealized Losses    
Unrealized Losses, Less than 12 months 2 69
Unrealized Losses, Greater than 12 months 98 86
Unrealized Losses $ 100 $ 155
Other asset-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 196 1,008
Number of Securities, Greater than 12 months | security 443 391
Number of Securities | security 639 1,399
Fair Value    
Fair Value, Less than 12 months $ 449 $ 1,893
Fair Value, Greater than 12 months 867 694
Fair Value 1,316 2,587
Unrealized Losses    
Unrealized Losses, Less than 12 months 4 88
Unrealized Losses, Greater than 12 months 14 48
Unrealized Losses $ 18 $ 136
Redeemable preferred securities    
Number of Securities    
Number of Securities, Less than 12 months | security 4 13
Number of Securities, Greater than 12 months | security 8 2
Number of Securities | security 12 15
Fair Value    
Fair Value, Less than 12 months $ 2 $ 18
Fair Value, Greater than 12 months 18 5
Fair Value 20 23
Unrealized Losses    
Unrealized Losses, Less than 12 months 0 2
Unrealized Losses, Greater than 12 months 1 0
Unrealized Losses $ 1 $ 2