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Investments - Unrealized Loss Position (Details) $ in Millions | Jun. 30, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
--- | --- | ---
Number of Securities |  |
Number of Securities, Less than 12 months | security | 1,663 | 468
Number of Securities, Greater than 12 months | security | 40 | 59
Number of Securities | security | 1,703 | 527
Fair Value |  |
Fair Value, Less than 12 months | $ 3,024 | $ 869
Fair Value, Greater than 12 months | 43 | 46
Fair Value | 3,067 | 915
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 31 | 10
Unrealized Losses, Greater than 12 months | 1 | 1
Unrealized Losses | $ 32 | $ 11
U.S. government securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 15 | 32
Number of Securities, Greater than 12 months | security | 0 | 0
Number of Securities | security | 15 | 32
Fair Value |  |
Fair Value, Less than 12 months | $ 76 | $ 205
Fair Value, Greater than 12 months | 0 | 0
Fair Value | 76 | 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 | 146 | 49
Number of Securities, Greater than 12 months | security | 1 | 0
Number of Securities | security | 147 | 49
Fair Value |  |
Fair Value, Less than 12 months | $ 302 | $ 83
Fair Value, Greater than 12 months | 4 | 0
Fair Value | 306 | 83
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 2 | 0
Unrealized Losses, Greater than 12 months | 0 | 0
Unrealized Losses | $ 2 | $ 0
U.S. corporate securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 807 | 145
Number of Securities, Greater than 12 months | security | 8 | 2
Number of Securities | security | 815 | 147
Fair Value |  |
Fair Value, Less than 12 months | $ 1,125 | $ 155
Fair Value, Greater than 12 months | 9 | 0
Fair Value | 1,134 | 155
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 13 | 8
Unrealized Losses, Greater than 12 months | 1 | 0
Unrealized Losses | $ 14 | $ 8
Foreign securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 237 | 41
Number of Securities, Greater than 12 months | security | 2 | 5
Number of Securities | security | 239 | 46
Fair Value |  |
Fair Value, Less than 12 months | $ 374 | $ 69
Fair Value, Greater than 12 months | 2 | 5
Fair Value | 376 | 74
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 6 | 1
Unrealized Losses, Greater than 12 months | 0 | 0
Unrealized Losses | $ 6 | $ 1
Residential mortgage-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 100 | 23
Number of Securities, Greater than 12 months | security | 5 | 3
Number of Securities | security | 105 | 26
Fair Value |  |
Fair Value, Less than 12 months | $ 398 | $ 26
Fair Value, Greater than 12 months | 0 | 0
Fair Value | 398 | 26
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 3 | 0
Unrealized Losses, Greater than 12 months | 0 | 0
Unrealized Losses | $ 3 | $ 0
Commercial mortgage-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 85 | 22
Number of Securities, Greater than 12 months | security | 0 | 0
Number of Securities | security | 85 | 22
Fair Value |  |
Fair Value, Less than 12 months | $ 241 | $ 75
Fair Value, Greater than 12 months | 0 | 0
Fair Value | 241 | 75
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 5 | 0
Unrealized Losses, Greater than 12 months | 0 | 0
Unrealized Losses | $ 5 | $ 0
Other asset-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 272 | 156
Number of Securities, Greater than 12 months | security | 24 | 49
Number of Securities | security | 296 | 205
Fair Value |  |
Fair Value, Less than 12 months | $ 505 | $ 256
Fair Value, Greater than 12 months | 28 | 41
Fair Value | 533 | 297
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 1 | 1
Unrealized Losses, Greater than 12 months | 0 | 1
Unrealized Losses | $ 1 | $ 2
Redeemable preferred securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 1 |
Number of Securities, Greater than 12 months | security | 0 |
Number of Securities | security | 1 |
Fair Value |  |
Fair Value, Less than 12 months | $ 3 |
Fair Value, Greater than 12 months | 0 |
Fair Value | 3 |
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 0 |
Unrealized Losses, Greater than 12 months | 0 |
Unrealized Losses | $ 0 |

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