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Investments - Unrealized Loss Position (Details)
$ in Millions
Jun. 30, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Number of Securities    
Number of Securities, Less than 12 months | security 4,792 9,500
Number of Securities, Greater than 12 months | security 6,778 2,784
Number of Securities | security 11,570 12,284
Fair Value    
Fair Value, Less than 12 months $ 7,475 $ 14,228
Fair Value, Greater than 12 months 10,183 4,264
Fair Value 17,658 18,492
Unrealized Losses    
Unrealized Losses, Less than 12 months 229 1,226
Unrealized Losses, Greater than 12 months 1,204 614
Unrealized Losses $ 1,433 $ 1,840
U.S. government securities    
Number of Securities    
Number of Securities, Less than 12 months | security 174 519
Number of Securities, Greater than 12 months | security 346 35
Number of Securities | security 520 554
Fair Value    
Fair Value, Less than 12 months $ 476 $ 1,620
Fair Value, Greater than 12 months 1,144 191
Fair Value 1,620 1,811
Unrealized Losses    
Unrealized Losses, Less than 12 months 19 164
Unrealized Losses, Greater than 12 months 140 18
Unrealized Losses $ 159 $ 182
States, municipalities and political subdivisions    
Number of Securities    
Number of Securities, Less than 12 months | security 440 859
Number of Securities, Greater than 12 months | security 610 196
Number of Securities | security 1,050 1,055
Fair Value    
Fair Value, Less than 12 months $ 816 $ 1,370
Fair Value, Greater than 12 months 913 322
Fair Value 1,729 1,692
Unrealized Losses    
Unrealized Losses, Less than 12 months 12 95
Unrealized Losses, Greater than 12 months 79 34
Unrealized Losses $ 91 $ 129
U.S. corporate securities    
Number of Securities    
Number of Securities, Less than 12 months | security 2,697 5,193
Number of Securities, Greater than 12 months | security 3,647 1,479
Number of Securities | security 6,344 6,672
Fair Value    
Fair Value, Less than 12 months $ 3,438 $ 6,537
Fair Value, Greater than 12 months 4,633 1,822
Fair Value 8,071 8,359
Unrealized Losses    
Unrealized Losses, Less than 12 months 125 622
Unrealized Losses, Greater than 12 months 578 281
Unrealized Losses $ 703 $ 903
Foreign securities    
Number of Securities    
Number of Securities, Less than 12 months | security 566 1,168
Number of Securities, Greater than 12 months | security 954 403
Number of Securities | security 1,520 1,571
Fair Value    
Fair Value, Less than 12 months $ 854 $ 1,715
Fair Value, Greater than 12 months 1,356 592
Fair Value 2,210 2,307
Unrealized Losses    
Unrealized Losses, Less than 12 months 24 147
Unrealized Losses, Greater than 12 months 168 97
Unrealized Losses $ 192 $ 244
Residential mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 321 452
Number of Securities, Greater than 12 months | security 218 91
Number of Securities | security 539 543
Fair Value    
Fair Value, Less than 12 months $ 403 $ 464
Fair Value, Greater than 12 months 336 257
Fair Value 739 721
Unrealized Losses    
Unrealized Losses, Less than 12 months 18 39
Unrealized Losses, Greater than 12 months 61 50
Unrealized Losses $ 79 $ 89
Commercial mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 126 288
Number of Securities, Greater than 12 months | security 328 187
Number of Securities | security 454 475
Fair Value    
Fair Value, Less than 12 months $ 311 $ 611
Fair Value, Greater than 12 months 619 381
Fair Value 930 992
Unrealized Losses    
Unrealized Losses, Less than 12 months 15 69
Unrealized Losses, Greater than 12 months 125 86
Unrealized Losses $ 140 $ 155
Other asset-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 466 1,008
Number of Securities, Greater than 12 months | security 669 391
Number of Securities | security 1,135 1,399
Fair Value    
Fair Value, Less than 12 months $ 1,174 $ 1,893
Fair Value, Greater than 12 months 1,168 694
Fair Value 2,342 2,587
Unrealized Losses    
Unrealized Losses, Less than 12 months 16 88
Unrealized Losses, Greater than 12 months 52 48
Unrealized Losses $ 68 $ 136
Redeemable preferred securities    
Number of Securities    
Number of Securities, Less than 12 months | security 2 13
Number of Securities, Greater than 12 months | security 6 2
Number of Securities | security 8 15
Fair Value    
Fair Value, Less than 12 months $ 3 $ 18
Fair Value, Greater than 12 months 14 5
Fair Value 17 23
Unrealized Losses    
Unrealized Losses, Less than 12 months 0 2
Unrealized Losses, Greater than 12 months 1 0
Unrealized Losses $ 1 $ 2