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Investments - Unrealized Loss Position (Details)
$ in Millions
Sep. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Number of Securities    
Number of Securities, Less than 12 months | security 493 1,182
Number of Securities, Greater than 12 months | security 4,554 7,018
Number of Securities | security 5,047 8,200
Fair Value    
Fair Value, Less than 12 months $ 871 $ 1,932
Fair Value, Greater than 12 months 6,584 10,616
Fair Value 7,455 12,548
Unrealized Losses    
Unrealized Losses, Less than 12 months 7 28
Unrealized Losses, Greater than 12 months 446 808
Unrealized Losses $ 453 $ 836
U.S. government securities    
Number of Securities    
Number of Securities, Less than 12 months | security 13 74
Number of Securities, Greater than 12 months | security 203 280
Number of Securities | security 216 354
Fair Value    
Fair Value, Less than 12 months $ 41 $ 194
Fair Value, Greater than 12 months 620 891
Fair Value 661 1,085
Unrealized Losses    
Unrealized Losses, Less than 12 months 1 2
Unrealized Losses, Greater than 12 months 22 52
Unrealized Losses $ 23 $ 54
States, municipalities and political subdivisions    
Number of Securities    
Number of Securities, Less than 12 months | security 30 95
Number of Securities, Greater than 12 months | security 159 455
Number of Securities | security 189 550
Fair Value    
Fair Value, Less than 12 months $ 46 $ 181
Fair Value, Greater than 12 months 235 733
Fair Value 281 914
Unrealized Losses    
Unrealized Losses, Less than 12 months 0 1
Unrealized Losses, Greater than 12 months 11 34
Unrealized Losses $ 11 $ 35
U.S. corporate securities    
Number of Securities    
Number of Securities, Less than 12 months | security 267 576
Number of Securities, Greater than 12 months | security 2,798 4,120
Number of Securities | security 3,065 4,696
Fair Value    
Fair Value, Less than 12 months $ 366 $ 672
Fair Value, Greater than 12 months 3,727 5,602
Fair Value 4,093 6,274
Unrealized Losses    
Unrealized Losses, Less than 12 months 2 14
Unrealized Losses, Greater than 12 months 252 432
Unrealized Losses $ 254 $ 446
Foreign securities    
Number of Securities    
Number of Securities, Less than 12 months | security 44 160
Number of Securities, Greater than 12 months | security 678 964
Number of Securities | security 722 1,124
Fair Value    
Fair Value, Less than 12 months $ 45 $ 243
Fair Value, Greater than 12 months 984 1,407
Fair Value 1,029 1,650
Unrealized Losses    
Unrealized Losses, Less than 12 months 1 4
Unrealized Losses, Greater than 12 months 68 118
Unrealized Losses $ 69 $ 122
Residential mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 6 33
Number of Securities, Greater than 12 months | security 365 461
Number of Securities | security 371 494
Fair Value    
Fair Value, Less than 12 months $ 27 $ 97
Fair Value, Greater than 12 months 370 517
Fair Value 397 614
Unrealized Losses    
Unrealized Losses, Less than 12 months 0 1
Unrealized Losses, Greater than 12 months 33 59
Unrealized Losses $ 33 $ 60
Commercial mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 28 44
Number of Securities, Greater than 12 months | security 261 287
Number of Securities | security 289 331
Fair Value    
Fair Value, Less than 12 months $ 110 $ 94
Fair Value, Greater than 12 months 528 581
Fair Value 638 675
Unrealized Losses    
Unrealized Losses, Less than 12 months 0 2
Unrealized Losses, Greater than 12 months 58 98
Unrealized Losses $ 58 $ 100
Other asset-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 105 196
Number of Securities, Greater than 12 months | security 86 443
Number of Securities | security 191 639
Fair Value    
Fair Value, Less than 12 months $ 236 $ 449
Fair Value, Greater than 12 months 114 867
Fair Value 350 1,316
Unrealized Losses    
Unrealized Losses, Less than 12 months 3 4
Unrealized Losses, Greater than 12 months 2 14
Unrealized Losses $ 5 $ 18
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 8
Number of Securities | security 4 12
Fair Value    
Fair Value, Less than 12 months $ 0 $ 2
Fair Value, Greater than 12 months 6 18
Fair Value 6 20
Unrealized Losses    
Unrealized Losses, Less than 12 months 0 0
Unrealized Losses, Greater than 12 months 0 1
Unrealized Losses $ 0 $ 1