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Investments - Unrealized Loss Position (Details)
$ in Millions
Sep. 30, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Number of Securities    
Number of Securities, Less than 12 months | security 4,515 9,500
Number of Securities, Greater than 12 months | security 7,900 2,784
Number of Securities | security 12,415 12,284
Fair Value    
Fair Value, Less than 12 months $ 6,501 $ 14,228
Fair Value, Greater than 12 months 11,675 4,264
Fair Value 18,176 18,492
Unrealized Losses    
Unrealized Losses, Less than 12 months 234 1,226
Unrealized Losses, Greater than 12 months 1,501 614
Unrealized Losses $ 1,735 $ 1,840
U.S. government securities    
Number of Securities    
Number of Securities, Less than 12 months | security 143 519
Number of Securities, Greater than 12 months | security 370 35
Number of Securities | security 513 554
Fair Value    
Fair Value, Less than 12 months $ 393 $ 1,620
Fair Value, Greater than 12 months 1,250 191
Fair Value 1,643 1,811
Unrealized Losses    
Unrealized Losses, Less than 12 months 12 164
Unrealized Losses, Greater than 12 months 159 18
Unrealized Losses $ 171 $ 182
States, municipalities and political subdivisions    
Number of Securities    
Number of Securities, Less than 12 months | security 614 859
Number of Securities, Greater than 12 months | security 634 196
Number of Securities | security 1,248 1,055
Fair Value    
Fair Value, Less than 12 months $ 1,003 $ 1,370
Fair Value, Greater than 12 months 939 322
Fair Value 1,942 1,692
Unrealized Losses    
Unrealized Losses, Less than 12 months 36 95
Unrealized Losses, Greater than 12 months 115 34
Unrealized Losses $ 151 $ 129
U.S. corporate securities    
Number of Securities    
Number of Securities, Less than 12 months | security 2,619 5,193
Number of Securities, Greater than 12 months | security 4,427 1,479
Number of Securities | security 7,046 6,672
Fair Value    
Fair Value, Less than 12 months $ 2,903 $ 6,537
Fair Value, Greater than 12 months 5,688 1,822
Fair Value 8,591 8,359
Unrealized Losses    
Unrealized Losses, Less than 12 months 127 622
Unrealized Losses, Greater than 12 months 752 281
Unrealized Losses $ 879 $ 903
Foreign securities    
Number of Securities    
Number of Securities, Less than 12 months | security 565 1,168
Number of Securities, Greater than 12 months | security 1,064 403
Number of Securities | security 1,629 1,571
Fair Value    
Fair Value, Less than 12 months $ 749 $ 1,715
Fair Value, Greater than 12 months 1,473 592
Fair Value 2,222 2,307
Unrealized Losses    
Unrealized Losses, Less than 12 months 28 147
Unrealized Losses, Greater than 12 months 205 97
Unrealized Losses $ 233 $ 244
Residential mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 88 452
Number of Securities, Greater than 12 months | security 460 91
Number of Securities | security 548 543
Fair Value    
Fair Value, Less than 12 months $ 234 $ 464
Fair Value, Greater than 12 months 496 257
Fair Value 730 721
Unrealized Losses    
Unrealized Losses, Less than 12 months 9 39
Unrealized Losses, Greater than 12 months 94 50
Unrealized Losses $ 103 $ 89
Commercial mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 83 288
Number of Securities, Greater than 12 months | security 340 187
Number of Securities | security 423 475
Fair Value    
Fair Value, Less than 12 months $ 207 $ 611
Fair Value, Greater than 12 months 668 381
Fair Value 875 992
Unrealized Losses    
Unrealized Losses, Less than 12 months 11 69
Unrealized Losses, Greater than 12 months 140 86
Unrealized Losses $ 151 $ 155
Other asset-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 399 1,008
Number of Securities, Greater than 12 months | security 597 391
Number of Securities | security 996 1,399
Fair Value    
Fair Value, Less than 12 months $ 1,010 $ 1,893
Fair Value, Greater than 12 months 1,144 694
Fair Value 2,154 2,587
Unrealized Losses    
Unrealized Losses, Less than 12 months 11 88
Unrealized Losses, Greater than 12 months 35 48
Unrealized Losses $ 46 $ 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 17 5
Fair Value 19 23
Unrealized Losses    
Unrealized Losses, Less than 12 months 0 2
Unrealized Losses, Greater than 12 months 1 0
Unrealized Losses $ 1 $ 2