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Investments - Unrealized Loss Position (Details)
$ in Millions
Mar. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Number of Securities    
Number of Securities, Less than 12 months | security 4,797 9,500
Number of Securities, Greater than 12 months | security 6,231 2,784
Number of Securities | security 11,028 12,284
Fair Value    
Fair Value, Less than 12 months $ 7,374 $ 14,228
Fair Value, Greater than 12 months 9,572 4,264
Fair Value 16,946 18,492
Unrealized Losses    
Unrealized Losses, Less than 12 months 288 1,226
Unrealized Losses, Greater than 12 months 1,105 614
Unrealized Losses $ 1,393 $ 1,840
U.S. government securities    
Number of Securities    
Number of Securities, Less than 12 months | security 153 519
Number of Securities, Greater than 12 months | security 323 35
Number of Securities | security 476 554
Fair Value    
Fair Value, Less than 12 months $ 473 $ 1,620
Fair Value, Greater than 12 months 1,143 191
Fair Value 1,616 1,811
Unrealized Losses    
Unrealized Losses, Less than 12 months 20 164
Unrealized Losses, Greater than 12 months 120 18
Unrealized Losses $ 140 $ 182
States, municipalities and political subdivisions    
Number of Securities    
Number of Securities, Less than 12 months | security 301 859
Number of Securities, Greater than 12 months | security 583 196
Number of Securities | security 884 1,055
Fair Value    
Fair Value, Less than 12 months $ 513 $ 1,370
Fair Value, Greater than 12 months 897 322
Fair Value 1,410 1,692
Unrealized Losses    
Unrealized Losses, Less than 12 months 12 95
Unrealized Losses, Greater than 12 months 74 34
Unrealized Losses $ 86 $ 129
U.S. corporate securities    
Number of Securities    
Number of Securities, Less than 12 months | security 2,675 5,193
Number of Securities, Greater than 12 months | security 3,300 1,479
Number of Securities | security 5,975 6,672
Fair Value    
Fair Value, Less than 12 months $ 3,640 $ 6,537
Fair Value, Greater than 12 months 4,116 1,822
Fair Value 7,756 8,359
Unrealized Losses    
Unrealized Losses, Less than 12 months 167 622
Unrealized Losses, Greater than 12 months 498 281
Unrealized Losses $ 665 $ 903
Foreign securities    
Number of Securities    
Number of Securities, Less than 12 months | security 653 1,168
Number of Securities, Greater than 12 months | security 787 403
Number of Securities | security 1,440 1,571
Fair Value    
Fair Value, Less than 12 months $ 946 $ 1,715
Fair Value, Greater than 12 months 1,163 592
Fair Value 2,109 2,307
Unrealized Losses    
Unrealized Losses, Less than 12 months 34 147
Unrealized Losses, Greater than 12 months 159 97
Unrealized Losses $ 193 $ 244
Residential mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 350 452
Number of Securities, Greater than 12 months | security 183 91
Number of Securities | security 533 543
Fair Value    
Fair Value, Less than 12 months $ 362 $ 464
Fair Value, Greater than 12 months 361 257
Fair Value 723 721
Unrealized Losses    
Unrealized Losses, Less than 12 months 12 39
Unrealized Losses, Greater than 12 months 59 50
Unrealized Losses $ 71 $ 89
Commercial mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 131 288
Number of Securities, Greater than 12 months | security 328 187
Number of Securities | security 459 475
Fair Value    
Fair Value, Less than 12 months $ 300 $ 611
Fair Value, Greater than 12 months 632 381
Fair Value 932 992
Unrealized Losses    
Unrealized Losses, Less than 12 months 18 69
Unrealized Losses, Greater than 12 months 128 86
Unrealized Losses $ 146 $ 155
Other asset-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 527 1,008
Number of Securities, Greater than 12 months | security 726 391
Number of Securities | security 1,253 1,399
Fair Value    
Fair Value, Less than 12 months $ 1,126 $ 1,893
Fair Value, Greater than 12 months 1,257 694
Fair Value 2,383 2,587
Unrealized Losses    
Unrealized Losses, Less than 12 months 23 88
Unrealized Losses, Greater than 12 months 67 48
Unrealized Losses $ 90 $ 136
Redeemable preferred securities    
Number of Securities    
Number of Securities, Less than 12 months | security 7 13
Number of Securities, Greater than 12 months | security 1 2
Number of Securities | security 8 15
Fair Value    
Fair Value, Less than 12 months $ 14 $ 18
Fair Value, Greater than 12 months 3 5
Fair Value 17 23
Unrealized Losses    
Unrealized Losses, Less than 12 months 2 2
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 2 $ 2