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Investments - Unrealized Loss Position (Details) $ in Millions | Dec. 31, 2020 USD ($) security | Dec. 31, 2019 USD ($) security
--- | --- | ---
Number of Securities |  |
Number of Securities, Less than 12 months | security | 468 | 522
Number of Securities, Greater than 12 months | security | 59 | 200
Number of Securities | security | 527 | 722
Fair Value |  |
Fair Value, Less than 12 months | $ 869 | $ 982
Fair Value, Greater than 12 months | 46 | 187
Fair Value | 915 | 1,169
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 10 | 6
Unrealized Losses, Greater than 12 months | 1 | 5
Unrealized Losses | $ 11 | $ 11
U.S. government securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 32 | 52
Number of Securities, Greater than 12 months | security | 0 | 0
Number of Securities | security | 32 | 52
Fair Value |  |
Fair Value, Less than 12 months | $ 205 | $ 168
Fair Value, Greater than 12 months | 0 | 0
Fair Value | 205 | 168
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 0 | 1
Unrealized Losses, Greater than 12 months | 0 | 0
Unrealized Losses | $ 0 | $ 1
States, municipalities and political subdivisions |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 49 | 66
Number of Securities, Greater than 12 months | security | 0 | 2
Number of Securities | security | 49 | 68
Fair Value |  |
Fair Value, Less than 12 months | $ 83 | $ 115
Fair Value, Greater than 12 months | 0 | 5
Fair Value | 83 | 120
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 0 | 1
Unrealized Losses, Greater than 12 months | 0 | 0
Unrealized Losses | $ 0 | $ 1
U.S. corporate securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 145 | 181
Number of Securities, Greater than 12 months | security | 2 | 2
Number of Securities | security | 147 | 183
Fair Value |  |
Fair Value, Less than 12 months | $ 155 | $ 305
Fair Value, Greater than 12 months | 0 | 0
Fair Value | 155 | 305
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 8 | 2
Unrealized Losses, Greater than 12 months | 0 | 1
Unrealized Losses | $ 8 | $ 3
Foreign securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 41 | 39
Number of Securities, Greater than 12 months | security | 5 | 0
Number of Securities | security | 46 | 39
Fair Value |  |
Fair Value, Less than 12 months | $ 69 | $ 75
Fair Value, Greater than 12 months | 5 | 0
Fair Value | 74 | 75
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 1 | 1
Unrealized Losses, Greater than 12 months | 0 | 0
Unrealized Losses | $ 1 | $ 1
Residential mortgage-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 23 | 30
Number of Securities, Greater than 12 months | security | 3 | 9
Number of Securities | security | 26 | 39
Fair Value |  |
Fair Value, Less than 12 months | $ 26 | $ 16
Fair Value, Greater than 12 months | 0 | 0
Fair Value | 26 | 16
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 0 | 0
Unrealized Losses, Greater than 12 months | 0 | 0
Unrealized Losses | $ 0 | $ 0
Commercial mortgage-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 22 | 16
Number of Securities, Greater than 12 months | security | 0 | 0
Number of Securities | security | 22 | 16
Fair Value |  |
Fair Value, Less than 12 months | $ 75 | $ 49
Fair Value, Greater than 12 months | 0 | 0
Fair Value | 75 | 49
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 0 | 0
Unrealized Losses, Greater than 12 months | 0 | 0
Unrealized Losses | $ 0 | $ 0
Other asset-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 156 | 138
Number of Securities, Greater than 12 months | security | 49 | 187
Number of Securities | security | 205 | 325
Fair Value |  |
Fair Value, Less than 12 months | $ 256 | $ 254
Fair Value, Greater than 12 months | 41 | 182
Fair Value | 297 | 436
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 1 | 1
Unrealized Losses, Greater than 12 months | 1 | 4
Unrealized Losses | $ 2 | $ 5

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