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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

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