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Investments - Unrealized Loss Position (Details)
$ in Millions
Dec. 31, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Number of Securities    
Number of Securities, Less than 12 months | security 1,578 4,502
Number of Securities, Greater than 12 months | security 2,465 4,174
Number of Securities | security 4,043 8,676
Fair Value    
Fair Value, Less than 12 months $ 2,856 $ 7,506
Fair Value, Greater than 12 months 3,476 5,734
Fair Value 6,332 13,240
Unrealized Losses    
Unrealized Losses, Less than 12 months 30 127
Unrealized Losses, Greater than 12 months 301 580
Unrealized Losses $ 331 $ 707
U.S. government securities    
Number of Securities    
Number of Securities, Less than 12 months | security 50 266
Number of Securities, Greater than 12 months | security 80 155
Number of Securities | security 130 421
Fair Value    
Fair Value, Less than 12 months $ 156 $ 1,053
Fair Value, Greater than 12 months 168 394
Fair Value 324 1,447
Unrealized Losses    
Unrealized Losses, Less than 12 months 2 18
Unrealized Losses, Greater than 12 months 6 20
Unrealized Losses $ 8 $ 38
States, municipalities and political subdivisions    
Number of Securities    
Number of Securities, Less than 12 months | security 16 100
Number of Securities, Greater than 12 months | security 89 137
Number of Securities | security 105 237
Fair Value    
Fair Value, Less than 12 months $ 28 $ 181
Fair Value, Greater than 12 months 136 201
Fair Value 164 382
Unrealized Losses    
Unrealized Losses, Less than 12 months 0 3
Unrealized Losses, Greater than 12 months 7 15
Unrealized Losses $ 7 $ 18
U.S. corporate securities    
Number of Securities    
Number of Securities, Less than 12 months | security 1,045 3,119
Number of Securities, Greater than 12 months | security 1,541 2,602
Number of Securities | security 2,586 5,721
Fair Value    
Fair Value, Less than 12 months $ 1,634 $ 4,144
Fair Value, Greater than 12 months 2,149 3,395
Fair Value 3,783 7,539
Unrealized Losses    
Unrealized Losses, Less than 12 months 23 64
Unrealized Losses, Greater than 12 months 208 348
Unrealized Losses $ 231 $ 412
Foreign securities    
Number of Securities    
Number of Securities, Less than 12 months | security 180 599
Number of Securities, Greater than 12 months | security 303 616
Number of Securities | security 483 1,215
Fair Value    
Fair Value, Less than 12 months $ 310 $ 810
Fair Value, Greater than 12 months 449 874
Fair Value 759 1,684
Unrealized Losses    
Unrealized Losses, Less than 12 months 2 21
Unrealized Losses, Greater than 12 months 29 90
Unrealized Losses $ 31 $ 111
Residential mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 67 89
Number of Securities, Greater than 12 months | security 303 361
Number of Securities | security 370 450
Fair Value    
Fair Value, Less than 12 months $ 124 $ 267
Fair Value, Greater than 12 months 272 342
Fair Value 396 609
Unrealized Losses    
Unrealized Losses, Less than 12 months 1 5
Unrealized Losses, Greater than 12 months 28 49
Unrealized Losses $ 29 $ 54
Commercial mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 84 186
Number of Securities, Greater than 12 months | security 126 237
Number of Securities | security 210 423
Fair Value    
Fair Value, Less than 12 months $ 290 $ 628
Fair Value, Greater than 12 months 269 464
Fair Value 559 1,092
Unrealized Losses    
Unrealized Losses, Less than 12 months 1 11
Unrealized Losses, Greater than 12 months 22 56
Unrealized Losses $ 23 $ 67
Other asset-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 136 139
Number of Securities, Greater than 12 months | security 19 62
Number of Securities | security 155 201
Fair Value    
Fair Value, Less than 12 months $ 314 $ 414
Fair Value, Greater than 12 months 27 58
Fair Value 341 472
Unrealized Losses    
Unrealized Losses, Less than 12 months 1 5
Unrealized Losses, Greater than 12 months 1 2
Unrealized Losses $ 2 $ 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