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Investments - Unrealized Loss Position (Details) $ in Millions | Jun. 30, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
--- | --- | ---
Number of Securities |  |
Number of Securities, Less than 12 months | security | 10,384 | 3,700
Number of Securities, Greater than 12 months | security | 690 | 317
Number of Securities | security | 11,074 | 4,017
Fair Value |  |
Fair Value, Less than 12 months | $ 15,825 | $ 6,800
Fair Value, Greater than 12 months | 1,093 | 584
Fair Value | 16,918 | 7,384
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 1,367 | 84
Unrealized Losses, Greater than 12 months | 148 | 22
Unrealized Losses | $ 1,515 | $ 106
U.S. government securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 464 | 43
Number of Securities, Greater than 12 months | security | 12 | 10
Number of Securities | security | 476 | 53
Fair Value |  |
Fair Value, Less than 12 months | $ 1,616 | $ 242
Fair Value, Greater than 12 months | 58 | 40
Fair Value | 1,674 | 282
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 115 | 2
Unrealized Losses, Greater than 12 months | 3 | 1
Unrealized Losses | $ 118 | $ 3
States, municipalities and political subdivisions |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 875 | 233
Number of Securities, Greater than 12 months | security | 27 | 13
Number of Securities | security | 902 | 246
Fair Value |  |
Fair Value, Less than 12 months | $ 1,372 | $ 428
Fair Value, Greater than 12 months | 55 | 33
Fair Value | 1,427 | 461
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 104 | 3
Unrealized Losses, Greater than 12 months | 6 | 1
Unrealized Losses | $ 110 | $ 4
U.S. corporate securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 5,583 | 1,610
Number of Securities, Greater than 12 months | security | 364 | 165
Number of Securities | security | 5,947 | 1,775
Fair Value |  |
Fair Value, Less than 12 months | $ 6,989 | $ 2,296
Fair Value, Greater than 12 months | 508 | 238
Fair Value | 7,497 | 2,534
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 674 | 31
Unrealized Losses, Greater than 12 months | 66 | 9
Unrealized Losses | $ 740 | $ 40
Foreign securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 1,304 | 449
Number of Securities, Greater than 12 months | security | 119 | 57
Number of Securities | security | 1,423 | 506
Fair Value |  |
Fair Value, Less than 12 months | $ 1,872 | $ 747
Fair Value, Greater than 12 months | 172 | 91
Fair Value | 2,044 | 838
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 206 | 20
Unrealized Losses, Greater than 12 months | 30 | 4
Unrealized Losses | $ 236 | $ 24
Residential mortgage-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 388 | 165
Number of Securities, Greater than 12 months | security | 23 | 10
Number of Securities | security | 411 | 175
Fair Value |  |
Fair Value, Less than 12 months | $ 644 | $ 593
Fair Value, Greater than 12 months | 65 | 36
Fair Value | 709 | 629
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 50 | 9
Unrealized Losses, Greater than 12 months | 11 | 1
Unrealized Losses | $ 61 | $ 10
Commercial mortgage-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 436 | 188
Number of Securities, Greater than 12 months | security | 53 | 35
Number of Securities | security | 489 | 223
Fair Value |  |
Fair Value, Less than 12 months | $ 955 | $ 462
Fair Value, Greater than 12 months | 118 | 112
Fair Value | 1,073 | 574
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 91 | 7
Unrealized Losses, Greater than 12 months | 23 | 5
Unrealized Losses | $ 114 | $ 12
Other asset-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 1,324 | 1,011
Number of Securities, Greater than 12 months | security | 91 | 26
Number of Securities | security | 1,415 | 1,037
Fair Value |  |
Fair Value, Less than 12 months | $ 2,358 | $ 2,030
Fair Value, Greater than 12 months | 114 | 31
Fair Value | 2,472 | 2,061
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 126 | 12
Unrealized Losses, Greater than 12 months | 9 | 1
Unrealized Losses | $ 135 | $ 13
Redeemable preferred securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 10 | 1
Number of Securities, Greater than 12 months | security | 1 | 1
Number of Securities | security | 11 | 2
Fair Value |  |
Fair Value, Less than 12 months | $ 19 | $ 2
Fair Value, Greater than 12 months | 3 | 3
Fair Value | 22 | 5
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 1 | 0
Unrealized Losses, Greater than 12 months | 0 | 0
Unrealized Losses | $ 1 | $ 0

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