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Investments - Unrealized Loss Position (Details) $ in Millions | Dec. 31, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
--- | --- | ---
Number of Securities |  |
Number of Securities, Less than 12 months | security | 1,182 | 9,500
Number of Securities, Greater than 12 months | security | 7,018 | 2,784
Number of Securities | security | 8,200 | 12,284
Fair Value |  |
Fair Value, Less than 12 months | $ 1,932 | $ 14,228
Fair Value, Greater than 12 months | 10,616 | 4,264
Fair Value | 12,548 | 18,492
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 28 | 1,226
Unrealized Losses, Greater than 12 months | 808 | 614
Unrealized Losses | $ 836 | $ 1,840
U.S. government securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 74 | 519
Number of Securities, Greater than 12 months | security | 280 | 35
Number of Securities | security | 354 | 554
Fair Value |  |
Fair Value, Less than 12 months | $ 194 | $ 1,620
Fair Value, Greater than 12 months | 891 | 191
Fair Value | 1,085 | 1,811
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 2 | 164
Unrealized Losses, Greater than 12 months | 52 | 18
Unrealized Losses | $ 54 | $ 182
States, municipalities and political subdivisions |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 95 | 859
Number of Securities, Greater than 12 months | security | 455 | 196
Number of Securities | security | 550 | 1,055
Fair Value |  |
Fair Value, Less than 12 months | $ 181 | $ 1,370
Fair Value, Greater than 12 months | 733 | 322
Fair Value | 914 | 1,692
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 1 | 95
Unrealized Losses, Greater than 12 months | 34 | 34
Unrealized Losses | $ 35 | $ 129
U.S. corporate securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 576 | 5,193
Number of Securities, Greater than 12 months | security | 4,120 | 1,479
Number of Securities | security | 4,696 | 6,672
Fair Value |  |
Fair Value, Less than 12 months | $ 672 | $ 6,537
Fair Value, Greater than 12 months | 5,602 | 1,822
Fair Value | 6,274 | 8,359
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 14 | 622
Unrealized Losses, Greater than 12 months | 432 | 281
Unrealized Losses | $ 446 | $ 903
Foreign securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 160 | 1,168
Number of Securities, Greater than 12 months | security | 964 | 403
Number of Securities | security | 1,124 | 1,571
Fair Value |  |
Fair Value, Less than 12 months | $ 243 | $ 1,715
Fair Value, Greater than 12 months | 1,407 | 592
Fair Value | 1,650 | 2,307
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 4 | 147
Unrealized Losses, Greater than 12 months | 118 | 97
Unrealized Losses | $ 122 | $ 244
Residential mortgage-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 33 | 452
Number of Securities, Greater than 12 months | security | 461 | 91
Number of Securities | security | 494 | 543
Fair Value |  |
Fair Value, Less than 12 months | $ 97 | $ 464
Fair Value, Greater than 12 months | 517 | 257
Fair Value | 614 | 721
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 1 | 39
Unrealized Losses, Greater than 12 months | 59 | 50
Unrealized Losses | $ 60 | $ 89
Commercial mortgage-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 44 | 288
Number of Securities, Greater than 12 months | security | 287 | 187
Number of Securities | security | 331 | 475
Fair Value |  |
Fair Value, Less than 12 months | $ 94 | $ 611
Fair Value, Greater than 12 months | 581 | 381
Fair Value | 675 | 992
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 2 | 69
Unrealized Losses, Greater than 12 months | 98 | 86
Unrealized Losses | $ 100 | $ 155
Other asset-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 196 | 1,008
Number of Securities, Greater than 12 months | security | 443 | 391
Number of Securities | security | 639 | 1,399
Fair Value |  |
Fair Value, Less than 12 months | $ 449 | $ 1,893
Fair Value, Greater than 12 months | 867 | 694
Fair Value | 1,316 | 2,587
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 4 | 88
Unrealized Losses, Greater than 12 months | 14 | 48
Unrealized Losses | $ 18 | $ 136
Redeemable preferred securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 4 | 13
Number of Securities, Greater than 12 months | security | 8 | 2
Number of Securities | security | 12 | 15
Fair Value |  |
Fair Value, Less than 12 months | $ 2 | $ 18
Fair Value, Greater than 12 months | 18 | 5
Fair Value | 20 | 23
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 0 | 2
Unrealized Losses, Greater than 12 months | 1 | 0
Unrealized Losses | $ 1 | $ 2

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