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Investments - Unrealized Loss Position (Details)
$ in Millions
Mar. 31, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Number of Securities    
Number of Securities, Less than 12 months | security 3,012 4,502
Number of Securities, Greater than 12 months | security 3,711 4,174
Number of Securities | security 6,723 8,676
Fair Value    
Fair Value, Less than 12 months $ 4,867 $ 7,506
Fair Value, Greater than 12 months 5,035 5,734
Fair Value 9,902 13,240
Unrealized Losses    
Unrealized Losses, Less than 12 months 71 127
Unrealized Losses, Greater than 12 months 476 580
Unrealized Losses $ 547 $ 707
U.S. government securities    
Number of Securities    
Number of Securities, Less than 12 months | security 60 266
Number of Securities, Greater than 12 months | security 121 155
Number of Securities | security 181 421
Fair Value    
Fair Value, Less than 12 months $ 194 $ 1,053
Fair Value, Greater than 12 months 287 394
Fair Value 481 1,447
Unrealized Losses    
Unrealized Losses, Less than 12 months 5 18
Unrealized Losses, Greater than 12 months 14 20
Unrealized Losses $ 19 $ 38
States, municipalities and political subdivisions    
Number of Securities    
Number of Securities, Less than 12 months | security 39 100
Number of Securities, Greater than 12 months | security 113 137
Number of Securities | security 152 237
Fair Value    
Fair Value, Less than 12 months $ 87 $ 181
Fair Value, Greater than 12 months 168 201
Fair Value 255 382
Unrealized Losses    
Unrealized Losses, Less than 12 months 4 3
Unrealized Losses, Greater than 12 months 9 15
Unrealized Losses $ 13 $ 18
U.S. corporate securities    
Number of Securities    
Number of Securities, Less than 12 months | security 1,856 3,119
Number of Securities, Greater than 12 months | security 2,378 2,602
Number of Securities | security 4,234 5,721
Fair Value    
Fair Value, Less than 12 months $ 2,384 $ 4,144
Fair Value, Greater than 12 months 3,143 3,395
Fair Value 5,527 7,539
Unrealized Losses    
Unrealized Losses, Less than 12 months 40 64
Unrealized Losses, Greater than 12 months 294 348
Unrealized Losses $ 334 $ 412
Foreign securities    
Number of Securities    
Number of Securities, Less than 12 months | security 419 599
Number of Securities, Greater than 12 months | security 550 616
Number of Securities | security 969 1,215
Fair Value    
Fair Value, Less than 12 months $ 577 $ 810
Fair Value, Greater than 12 months 770 874
Fair Value 1,347 1,684
Unrealized Losses    
Unrealized Losses, Less than 12 months 11 21
Unrealized Losses, Greater than 12 months 70 90
Unrealized Losses $ 81 $ 111
Residential mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 46 89
Number of Securities, Greater than 12 months | security 339 361
Number of Securities | security 385 450
Fair Value    
Fair Value, Less than 12 months $ 130 $ 267
Fair Value, Greater than 12 months 315 342
Fair Value 445 609
Unrealized Losses    
Unrealized Losses, Less than 12 months 1 5
Unrealized Losses, Greater than 12 months 40 49
Unrealized Losses $ 41 $ 54
Commercial mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 114 186
Number of Securities, Greater than 12 months | security 158 237
Number of Securities | security 272 423
Fair Value    
Fair Value, Less than 12 months $ 391 $ 628
Fair Value, Greater than 12 months 303 464
Fair Value 694 1,092
Unrealized Losses    
Unrealized Losses, Less than 12 months 4 11
Unrealized Losses, Greater than 12 months 46 56
Unrealized Losses $ 50 $ 67
Other asset-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 478 139
Number of Securities, Greater than 12 months | security 48 62
Number of Securities | security 526 201
Fair Value    
Fair Value, Less than 12 months $ 1,104 $ 414
Fair Value, Greater than 12 months 43 58
Fair Value 1,147 472
Unrealized Losses    
Unrealized Losses, Less than 12 months 6 5
Unrealized Losses, Greater than 12 months 3 2
Unrealized Losses $ 9 $ 7
Redeemable preferred securities    
Number of Securities    
Number of Securities, Less than 12 months | security 0 4
Number of Securities, Greater than 12 months | security 4 4
Number of Securities | security 4 8
Fair Value    
Fair Value, Less than 12 months $ 0 $ 9
Fair Value, Greater than 12 months 6 6
Fair Value 6 15
Unrealized Losses    
Unrealized Losses, Less than 12 months 0 0
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 0 $ 0