v3.26.1
Investments - Unrealized Loss Position (Details)
$ in Millions
Jun. 30, 2026
USD ($)
security
Dec. 31, 2025
USD ($)
security
Number of Securities    
Number of Securities, Less than 12 months | security 6,098 1,578
Number of Securities, Greater than 12 months | security 1,831 2,465
Number of Securities | security 7,929 4,043
Fair Value    
Fair Value, Less than 12 months $ 12,347 $ 2,856
Fair Value, Greater than 12 months 2,475 3,476
Fair Value 14,822 6,332
Unrealized Losses    
Unrealized Losses, Less than 12 months 141 30
Unrealized Losses, Greater than 12 months 281 301
Unrealized Losses $ 422 $ 331
U.S. government securities    
Number of Securities    
Number of Securities, Less than 12 months | security 277 50
Number of Securities, Greater than 12 months | security 68 80
Number of Securities | security 345 130
Fair Value    
Fair Value, Less than 12 months $ 995 $ 156
Fair Value, Greater than 12 months 122 168
Fair Value 1,117 324
Unrealized Losses    
Unrealized Losses, Less than 12 months 9 2
Unrealized Losses, Greater than 12 months 5 6
Unrealized Losses $ 14 $ 8
States, municipalities and political subdivisions    
Number of Securities    
Number of Securities, Less than 12 months | security 29 16
Number of Securities, Greater than 12 months | security 55 89
Number of Securities | security 84 105
Fair Value    
Fair Value, Less than 12 months $ 57 $ 28
Fair Value, Greater than 12 months 77 136
Fair Value 134 164
Unrealized Losses    
Unrealized Losses, Less than 12 months 1 0
Unrealized Losses, Greater than 12 months 5 7
Unrealized Losses $ 6 $ 7
U.S. corporate securities    
Number of Securities    
Number of Securities, Less than 12 months | security 3,956 1,045
Number of Securities, Greater than 12 months | security 1,171 1,541
Number of Securities | security 5,127 2,586
Fair Value    
Fair Value, Less than 12 months $ 6,833 $ 1,634
Fair Value, Greater than 12 months 1,640 2,149
Fair Value 8,473 3,783
Unrealized Losses    
Unrealized Losses, Less than 12 months 92 23
Unrealized Losses, Greater than 12 months 200 208
Unrealized Losses $ 292 $ 231
Foreign securities    
Number of Securities    
Number of Securities, Less than 12 months | security 676 180
Number of Securities, Greater than 12 months | security 171 303
Number of Securities | security 847 483
Fair Value    
Fair Value, Less than 12 months $ 1,227 $ 310
Fair Value, Greater than 12 months 243 449
Fair Value 1,470 759
Unrealized Losses    
Unrealized Losses, Less than 12 months 12 2
Unrealized Losses, Greater than 12 months 22 29
Unrealized Losses $ 34 $ 31
Residential mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 242 67
Number of Securities, Greater than 12 months | security 276 303
Number of Securities | security 518 370
Fair Value    
Fair Value, Less than 12 months $ 468 $ 124
Fair Value, Greater than 12 months 215 272
Fair Value 683 396
Unrealized Losses    
Unrealized Losses, Less than 12 months 5 1
Unrealized Losses, Greater than 12 months 29 28
Unrealized Losses $ 34 $ 29
Commercial mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 392 84
Number of Securities, Greater than 12 months | security 74 126
Number of Securities | security 466 210
Fair Value    
Fair Value, Less than 12 months $ 1,176 $ 290
Fair Value, Greater than 12 months 159 269
Fair Value 1,335 559
Unrealized Losses    
Unrealized Losses, Less than 12 months 15 1
Unrealized Losses, Greater than 12 months 19 22
Unrealized Losses $ 34 $ 23
Other asset-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 522 136
Number of Securities, Greater than 12 months | security 16 19
Number of Securities | security 538 155
Fair Value    
Fair Value, Less than 12 months $ 1,585 $ 314
Fair Value, Greater than 12 months 19 27
Fair Value 1,604 341
Unrealized Losses    
Unrealized Losses, Less than 12 months 7 1
Unrealized Losses, Greater than 12 months 1 1
Unrealized Losses $ 8 $ 2
Redeemable preferred securities    
Number of Securities    
Number of Securities, Less than 12 months | security 4 0
Number of Securities, Greater than 12 months | security 0 4
Number of Securities | security 4 4
Fair Value    
Fair Value, Less than 12 months $ 6 $ 0
Fair Value, Greater than 12 months 0 6
Fair Value 6 6
Unrealized Losses    
Unrealized Losses, Less than 12 months 0 0
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 0 $ 0