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Investments - Unrealized Loss Position (Details) $ in Millions | Mar. 31, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
--- | --- | ---
Number of Securities |  |
Number of Securities, Less than 12 months | security | 7,721 | 3,700
Number of Securities, Greater than 12 months | security | 638 | 317
Number of Securities | security | 8,359 | 4,017
Fair Value |  |
Fair Value, Less than 12 months | $ 12,501 | $ 6,800
Fair Value, Greater than 12 months | 1,046 | 584
Fair Value | 13,547 | 7,384
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 623 | 84
Unrealized Losses, Greater than 12 months | 103 | 22
Unrealized Losses | $ 726 | $ 106
U.S. government securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 389 | 43
Number of Securities, Greater than 12 months | security | 11 | 10
Number of Securities | security | 400 | 53
Fair Value |  |
Fair Value, Less than 12 months | $ 1,468 | $ 242
Fair Value, Greater than 12 months | 49 | 40
Fair Value | 1,517 | 282
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 65 | 2
Unrealized Losses, Greater than 12 months | 3 | 1
Unrealized Losses | $ 68 | $ 3
States, municipalities and political subdivisions |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 728 | 233
Number of Securities, Greater than 12 months | security | 23 | 13
Number of Securities | security | 751 | 246
Fair Value |  |
Fair Value, Less than 12 months | $ 1,159 | $ 428
Fair Value, Greater than 12 months | 44 | 33
Fair Value | 1,203 | 461
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 61 | 3
Unrealized Losses, Greater than 12 months | 4 | 1
Unrealized Losses | $ 65 | $ 4
U.S. corporate securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 3,907 | 1,610
Number of Securities, Greater than 12 months | security | 339 | 165
Number of Securities | security | 4,246 | 1,775
Fair Value |  |
Fair Value, Less than 12 months | $ 4,992 | $ 2,296
Fair Value, Greater than 12 months | 484 | 238
Fair Value | 5,476 | 2,534
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 278 | 31
Unrealized Losses, Greater than 12 months | 44 | 9
Unrealized Losses | $ 322 | $ 40
Foreign securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 868 | 449
Number of Securities, Greater than 12 months | security | 114 | 57
Number of Securities | security | 982 | 506
Fair Value |  |
Fair Value, Less than 12 months | $ 1,325 | $ 747
Fair Value, Greater than 12 months | 159 | 91
Fair Value | 1,484 | 838
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 72 | 20
Unrealized Losses, Greater than 12 months | 23 | 4
Unrealized Losses | $ 95 | $ 24
Residential mortgage-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 239 | 165
Number of Securities, Greater than 12 months | security | 26 | 10
Number of Securities | security | 265 | 175
Fair Value |  |
Fair Value, Less than 12 months | $ 606 | $ 593
Fair Value, Greater than 12 months | 80 | 36
Fair Value | 686 | 629
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 40 | 9
Unrealized Losses, Greater than 12 months | 8 | 1
Unrealized Losses | $ 48 | $ 10
Commercial mortgage-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 326 | 188
Number of Securities, Greater than 12 months | security | 55 | 35
Number of Securities | security | 381 | 223
Fair Value |  |
Fair Value, Less than 12 months | $ 701 | $ 462
Fair Value, Greater than 12 months | 130 | 112
Fair Value | 831 | 574
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 50 | 7
Unrealized Losses, Greater than 12 months | 17 | 5
Unrealized Losses | $ 67 | $ 12
Other asset-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 1,261 | 1,011
Number of Securities, Greater than 12 months | security | 69 | 26
Number of Securities | security | 1,330 | 1,037
Fair Value |  |
Fair Value, Less than 12 months | $ 2,246 | $ 2,030
Fair Value, Greater than 12 months | 97 | 31
Fair Value | 2,343 | 2,061
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 57 | 12
Unrealized Losses, Greater than 12 months | 4 | 1
Unrealized Losses | $ 61 | $ 13
Redeemable preferred securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 3 | 1
Number of Securities, Greater than 12 months | security | 1 | 1
Number of Securities | security | 4 | 2
Fair Value |  |
Fair Value, Less than 12 months | $ 4 | $ 2
Fair Value, Greater than 12 months | 3 | 3
Fair Value | 7 | 5
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 0 | 0
Unrealized Losses, Greater than 12 months | 0 | 0
Unrealized Losses | $ 0 | $ 0

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