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Investments - Unrealized Loss Position (Details) $ in Millions | Sep. 30, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
--- | --- | ---
Number of Securities |  |
Number of Securities, Less than 12 months | security | 2,243 | 468
Number of Securities, Greater than 12 months | security | 100 | 59
Number of Securities | security | 2,343 | 527
Fair Value |  |
Fair Value, Less than 12 months | $ 4,239 | $ 869
Fair Value, Greater than 12 months | 151 | 46
Fair Value | 4,390 | 915
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 49 | 10
Unrealized Losses, Greater than 12 months | 6 | 1
Unrealized Losses | $ 55 | $ 11
U.S. government securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 45 | 32
Number of Securities, Greater than 12 months | security | 2 | 0
Number of Securities | security | 47 | 32
Fair Value |  |
Fair Value, Less than 12 months | $ 204 | $ 205
Fair Value, Greater than 12 months | 1 | 0
Fair Value | 205 | 205
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 1 | 0
Unrealized Losses, Greater than 12 months | 0 | 0
Unrealized Losses | $ 1 | $ 0
States, municipalities and political subdivisions |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 234 | 49
Number of Securities, Greater than 12 months | security | 1 | 0
Number of Securities | security | 235 | 49
Fair Value |  |
Fair Value, Less than 12 months | $ 464 | $ 83
Fair Value, Greater than 12 months | 4 | 0
Fair Value | 468 | 83
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 5 | 0
Unrealized Losses, Greater than 12 months | 0 | 0
Unrealized Losses | $ 5 | $ 0
U.S. corporate securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 1,081 | 145
Number of Securities, Greater than 12 months | security | 43 | 2
Number of Securities | security | 1,124 | 147
Fair Value |  |
Fair Value, Less than 12 months | $ 1,528 | $ 155
Fair Value, Greater than 12 months | 51 | 0
Fair Value | 1,579 | 155
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 19 | 8
Unrealized Losses, Greater than 12 months | 3 | 0
Unrealized Losses | $ 22 | $ 8
Foreign securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 320 | 41
Number of Securities, Greater than 12 months | security | 12 | 5
Number of Securities | security | 332 | 46
Fair Value |  |
Fair Value, Less than 12 months | $ 568 | $ 69
Fair Value, Greater than 12 months | 21 | 5
Fair Value | 589 | 74
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 11 | 1
Unrealized Losses, Greater than 12 months | 1 | 0
Unrealized Losses | $ 12 | $ 1
Residential mortgage-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 122 | 23
Number of Securities, Greater than 12 months | security | 9 | 3
Number of Securities | security | 131 | 26
Fair Value |  |
Fair Value, Less than 12 months | $ 476 | $ 26
Fair Value, Greater than 12 months | 10 | 0
Fair Value | 486 | 26
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 5 | 0
Unrealized Losses, Greater than 12 months | 0 | 0
Unrealized Losses | $ 5 | $ 0
Commercial mortgage-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 127 | 22
Number of Securities, Greater than 12 months | security | 15 | 0
Number of Securities | security | 142 | 22
Fair Value |  |
Fair Value, Less than 12 months | $ 342 | $ 75
Fair Value, Greater than 12 months | 47 | 0
Fair Value | 389 | 75
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 6 | 0
Unrealized Losses, Greater than 12 months | 2 | 0
Unrealized Losses | $ 8 | $ 0
Other asset-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 312 | 156
Number of Securities, Greater than 12 months | security | 18 | 49
Number of Securities | security | 330 | 205
Fair Value |  |
Fair Value, Less than 12 months | $ 652 | $ 256
Fair Value, Greater than 12 months | 17 | 41
Fair Value | 669 | 297
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 2 | 1
Unrealized Losses, Greater than 12 months | 0 | 1
Unrealized Losses | $ 2 | $ 2
Redeemable preferred securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 2 |
Number of Securities, Greater than 12 months | security | 0 |
Number of Securities | security | 2 |
Fair Value |  |
Fair Value, Less than 12 months | $ 5 |
Fair Value, Greater than 12 months | 0 |
Fair Value | 5 |
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 0 |
Unrealized Losses, Greater than 12 months | 0 |
Unrealized Losses | $ 0 |

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