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Investments - Unrealized Loss Position (Details) $ in Millions | Dec. 31, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
--- | --- | ---
Number of Securities |  |
Number of Securities, Less than 12 months | security | 9,500 | 3,700
Number of Securities, Greater than 12 months | security | 2,784 | 317
Number of Securities | security | 12,284 | 4,017
Fair Value |  |
Fair Value, Less than 12 months | $ 14,228 | $ 6,800
Fair Value, Greater than 12 months | 4,264 | 584
Fair Value | 18,492 | 7,384
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 1,226 | 84
Unrealized Losses, Greater than 12 months | 614 | 22
Unrealized Losses | $ 1,840 | $ 106
U.S. government securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 519 | 43
Number of Securities, Greater than 12 months | security | 35 | 10
Number of Securities | security | 554 | 53
Fair Value |  |
Fair Value, Less than 12 months | $ 1,620 | $ 242
Fair Value, Greater than 12 months | 191 | 40
Fair Value | 1,811 | 282
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 164 | 2
Unrealized Losses, Greater than 12 months | 18 | 1
Unrealized Losses | $ 182 | $ 3
States, municipalities and political subdivisions |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 859 | 233
Number of Securities, Greater than 12 months | security | 196 | 13
Number of Securities | security | 1,055 | 246
Fair Value |  |
Fair Value, Less than 12 months | $ 1,370 | $ 428
Fair Value, Greater than 12 months | 322 | 33
Fair Value | 1,692 | 461
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 95 | 3
Unrealized Losses, Greater than 12 months | 34 | 1
Unrealized Losses | $ 129 | $ 4
U.S. corporate securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 5,193 | 1,610
Number of Securities, Greater than 12 months | security | 1,479 | 165
Number of Securities | security | 6,672 | 1,775
Fair Value |  |
Fair Value, Less than 12 months | $ 6,537 | $ 2,296
Fair Value, Greater than 12 months | 1,822 | 238
Fair Value | 8,359 | 2,534
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 622 | 31
Unrealized Losses, Greater than 12 months | 281 | 9
Unrealized Losses | $ 903 | $ 40
Foreign securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 1,168 | 449
Number of Securities, Greater than 12 months | security | 403 | 57
Number of Securities | security | 1,571 | 506
Fair Value |  |
Fair Value, Less than 12 months | $ 1,715 | $ 747
Fair Value, Greater than 12 months | 592 | 91
Fair Value | 2,307 | 838
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 147 | 20
Unrealized Losses, Greater than 12 months | 97 | 4
Unrealized Losses | $ 244 | $ 24
Residential mortgage-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 452 | 165
Number of Securities, Greater than 12 months | security | 91 | 10
Number of Securities | security | 543 | 175
Fair Value |  |
Fair Value, Less than 12 months | $ 464 | $ 593
Fair Value, Greater than 12 months | 257 | 36
Fair Value | 721 | 629
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 39 | 9
Unrealized Losses, Greater than 12 months | 50 | 1
Unrealized Losses | $ 89 | $ 10
Commercial mortgage-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 288 | 188
Number of Securities, Greater than 12 months | security | 187 | 35
Number of Securities | security | 475 | 223
Fair Value |  |
Fair Value, Less than 12 months | $ 611 | $ 462
Fair Value, Greater than 12 months | 381 | 112
Fair Value | 992 | 574
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 69 | 7
Unrealized Losses, Greater than 12 months | 86 | 5
Unrealized Losses | $ 155 | $ 12
Other asset-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 1,008 | 1,011
Number of Securities, Greater than 12 months | security | 391 | 26
Number of Securities | security | 1,399 | 1,037
Fair Value |  |
Fair Value, Less than 12 months | $ 1,893 | $ 2,030
Fair Value, Greater than 12 months | 694 | 31
Fair Value | 2,587 | 2,061
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 88 | 12
Unrealized Losses, Greater than 12 months | 48 | 1
Unrealized Losses | $ 136 | $ 13
Redeemable preferred securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 13 | 1
Number of Securities, Greater than 12 months | security | 2 | 1
Number of Securities | security | 15 | 2
Fair Value |  |
Fair Value, Less than 12 months | $ 18 | $ 2
Fair Value, Greater than 12 months | 5 | 3
Fair Value | 23 | 5
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 2 | 0
Unrealized Losses, Greater than 12 months | 0 | 0
Unrealized Losses | $ 2 | $ 0

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