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Investments - Unrealized Loss Position (Details)
$ in Millions
Dec. 31, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
security
Number of Securities    
Number of Securities, Less than 12 months | security 9,500 3,700
Number of Securities, Greater than 12 months | security 2,784 317
Number of Securities | security 12,284 4,017
Fair Value    
Fair Value, Less than 12 months $ 14,228 $ 6,800
Fair Value, Greater than 12 months 4,264 584
Fair Value 18,492 7,384
Unrealized Losses    
Unrealized Losses, Less than 12 months 1,226 84
Unrealized Losses, Greater than 12 months 614 22
Unrealized Losses $ 1,840 $ 106
U.S. government securities    
Number of Securities    
Number of Securities, Less than 12 months | security 519 43
Number of Securities, Greater than 12 months | security 35 10
Number of Securities | security 554 53
Fair Value    
Fair Value, Less than 12 months $ 1,620 $ 242
Fair Value, Greater than 12 months 191 40
Fair Value 1,811 282
Unrealized Losses    
Unrealized Losses, Less than 12 months 164 2
Unrealized Losses, Greater than 12 months 18 1
Unrealized Losses $ 182 $ 3
States, municipalities and political subdivisions    
Number of Securities    
Number of Securities, Less than 12 months | security 859 233
Number of Securities, Greater than 12 months | security 196 13
Number of Securities | security 1,055 246
Fair Value    
Fair Value, Less than 12 months $ 1,370 $ 428
Fair Value, Greater than 12 months 322 33
Fair Value 1,692 461
Unrealized Losses    
Unrealized Losses, Less than 12 months 95 3
Unrealized Losses, Greater than 12 months 34 1
Unrealized Losses $ 129 $ 4
U.S. corporate securities    
Number of Securities    
Number of Securities, Less than 12 months | security 5,193 1,610
Number of Securities, Greater than 12 months | security 1,479 165
Number of Securities | security 6,672 1,775
Fair Value    
Fair Value, Less than 12 months $ 6,537 $ 2,296
Fair Value, Greater than 12 months 1,822 238
Fair Value 8,359 2,534
Unrealized Losses    
Unrealized Losses, Less than 12 months 622 31
Unrealized Losses, Greater than 12 months 281 9
Unrealized Losses $ 903 $ 40
Foreign securities    
Number of Securities    
Number of Securities, Less than 12 months | security 1,168 449
Number of Securities, Greater than 12 months | security 403 57
Number of Securities | security 1,571 506
Fair Value    
Fair Value, Less than 12 months $ 1,715 $ 747
Fair Value, Greater than 12 months 592 91
Fair Value 2,307 838
Unrealized Losses    
Unrealized Losses, Less than 12 months 147 20
Unrealized Losses, Greater than 12 months 97 4
Unrealized Losses $ 244 $ 24
Residential mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 452 165
Number of Securities, Greater than 12 months | security 91 10
Number of Securities | security 543 175
Fair Value    
Fair Value, Less than 12 months $ 464 $ 593
Fair Value, Greater than 12 months 257 36
Fair Value 721 629
Unrealized Losses    
Unrealized Losses, Less than 12 months 39 9
Unrealized Losses, Greater than 12 months 50 1
Unrealized Losses $ 89 $ 10
Commercial mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 288 188
Number of Securities, Greater than 12 months | security 187 35
Number of Securities | security 475 223
Fair Value    
Fair Value, Less than 12 months $ 611 $ 462
Fair Value, Greater than 12 months 381 112
Fair Value 992 574
Unrealized Losses    
Unrealized Losses, Less than 12 months 69 7
Unrealized Losses, Greater than 12 months 86 5
Unrealized Losses $ 155 $ 12
Other asset-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 1,008 1,011
Number of Securities, Greater than 12 months | security 391 26
Number of Securities | security 1,399 1,037
Fair Value    
Fair Value, Less than 12 months $ 1,893 $ 2,030
Fair Value, Greater than 12 months 694 31
Fair Value 2,587 2,061
Unrealized Losses    
Unrealized Losses, Less than 12 months 88 12
Unrealized Losses, Greater than 12 months 48 1
Unrealized Losses $ 136 $ 13
Redeemable preferred securities    
Number of Securities    
Number of Securities, Less than 12 months | security 13 1
Number of Securities, Greater than 12 months | security 2 1
Number of Securities | security 15 2
Fair Value    
Fair Value, Less than 12 months $ 18 $ 2
Fair Value, Greater than 12 months 5 3
Fair Value 23 5
Unrealized Losses    
Unrealized Losses, Less than 12 months 2 0
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 2 $ 0