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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

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