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Investments - Unrealized Loss Position (Details)
$ in Millions
Jun. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Number of Securities    
Number of Securities, Less than 12 months | security 3,497 1,182
Number of Securities, Greater than 12 months | security 6,232 7,018
Number of Securities | security 9,729 8,200
Fair Value    
Fair Value, Less than 12 months $ 6,042 $ 1,932
Fair Value, Greater than 12 months 8,959 10,616
Fair Value 15,001 12,548
Unrealized Losses    
Unrealized Losses, Less than 12 months 64 28
Unrealized Losses, Greater than 12 months 799 808
Unrealized Losses $ 863 $ 836
U.S. government securities    
Number of Securities    
Number of Securities, Less than 12 months | security 221 74
Number of Securities, Greater than 12 months | security 272 280
Number of Securities | security 493 354
Fair Value    
Fair Value, Less than 12 months $ 1,191 $ 194
Fair Value, Greater than 12 months 761 891
Fair Value 1,952 1,085
Unrealized Losses    
Unrealized Losses, Less than 12 months 11 2
Unrealized Losses, Greater than 12 months 45 52
Unrealized Losses $ 56 $ 54
States, municipalities and political subdivisions    
Number of Securities    
Number of Securities, Less than 12 months | security 163 95
Number of Securities, Greater than 12 months | security 246 455
Number of Securities | security 409 550
Fair Value    
Fair Value, Less than 12 months $ 300 $ 181
Fair Value, Greater than 12 months 386 733
Fair Value 686 914
Unrealized Losses    
Unrealized Losses, Less than 12 months 1 1
Unrealized Losses, Greater than 12 months 21 34
Unrealized Losses $ 22 $ 35
U.S. corporate securities    
Number of Securities    
Number of Securities, Less than 12 months | security 2,241 576
Number of Securities, Greater than 12 months | security 3,937 4,120
Number of Securities | security 6,178 4,696
Fair Value    
Fair Value, Less than 12 months $ 2,849 $ 672
Fair Value, Greater than 12 months 5,118 5,602
Fair Value 7,967 6,274
Unrealized Losses    
Unrealized Losses, Less than 12 months 34 14
Unrealized Losses, Greater than 12 months 455 432
Unrealized Losses $ 489 $ 446
Foreign securities    
Number of Securities    
Number of Securities, Less than 12 months | security 460 160
Number of Securities, Greater than 12 months | security 886 964
Number of Securities | security 1,346 1,124
Fair Value    
Fair Value, Less than 12 months $ 600 $ 243
Fair Value, Greater than 12 months 1,280 1,407
Fair Value 1,880 1,650
Unrealized Losses    
Unrealized Losses, Less than 12 months 10 4
Unrealized Losses, Greater than 12 months 120 118
Unrealized Losses $ 130 $ 122
Residential mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 51 33
Number of Securities, Greater than 12 months | security 424 461
Number of Securities | security 475 494
Fair Value    
Fair Value, Less than 12 months $ 170 $ 97
Fair Value, Greater than 12 months 469 517
Fair Value 639 614
Unrealized Losses    
Unrealized Losses, Less than 12 months 1 1
Unrealized Losses, Greater than 12 months 59 59
Unrealized Losses $ 60 $ 60
Commercial mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 70 44
Number of Securities, Greater than 12 months | security 304 287
Number of Securities | security 374 331
Fair Value    
Fair Value, Less than 12 months $ 206 $ 94
Fair Value, Greater than 12 months 610 581
Fair Value 816 675
Unrealized Losses    
Unrealized Losses, Less than 12 months 2 2
Unrealized Losses, Greater than 12 months 91 98
Unrealized Losses $ 93 $ 100
Other asset-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 290 196
Number of Securities, Greater than 12 months | security 156 443
Number of Securities | security 446 639
Fair Value    
Fair Value, Less than 12 months $ 721 $ 449
Fair Value, Greater than 12 months 323 867
Fair Value 1,044 1,316
Unrealized Losses    
Unrealized Losses, Less than 12 months 5 4
Unrealized Losses, Greater than 12 months 7 14
Unrealized Losses $ 12 $ 18
Redeemable preferred securities    
Number of Securities    
Number of Securities, Less than 12 months | security 1 4
Number of Securities, Greater than 12 months | security 7 8
Number of Securities | security 8 12
Fair Value    
Fair Value, Less than 12 months $ 5 $ 2
Fair Value, Greater than 12 months 12 18
Fair Value 17 20
Unrealized Losses    
Unrealized Losses, Less than 12 months 0 0
Unrealized Losses, Greater than 12 months 1 1
Unrealized Losses $ 1 $ 1