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Investments - Unrealized Loss Position (Details) $ in Millions | Mar. 31, 2020 USD ($) security | Dec. 31, 2019 USD ($) security
--- | --- | ---
Number of Securities |  |
Number of Securities, Less than 12 months | security | 2,947 | 522
Number of Securities, Greater than 12 months | security | 102 | 200
Number of Securities | security | 3,049 | 722
Fair Value |  |
Fair Value, Less than 12 months | $ 3,630 | $ 982
Fair Value, Greater than 12 months | 70 | 187
Fair Value | 3,700 | 1,169
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 232 | 6
Unrealized Losses, Greater than 12 months | 14 | 5
Unrealized Losses | $ 246 | $ 11
U.S. government securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 8 | 52
Number of Securities, Greater than 12 months | security | 0 | 0
Number of Securities | security | 8 | 52
Fair Value |  |
Fair Value, Less than 12 months | $ 20 | $ 168
Fair Value, Greater than 12 months | 0 | 0
Fair Value | 20 | 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 | 174 | 66
Number of Securities, Greater than 12 months | security | 0 | 2
Number of Securities | security | 174 | 68
Fair Value |  |
Fair Value, Less than 12 months | $ 314 | $ 115
Fair Value, Greater than 12 months | 0 | 5
Fair Value | 314 | 120
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 7 | 1
Unrealized Losses, Greater than 12 months | 0 | 0
Unrealized Losses | $ 7 | $ 1
U.S. corporate securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 1,622 | 181
Number of Securities, Greater than 12 months | security | 6 | 2
Number of Securities | security | 1,628 | 183
Fair Value |  |
Fair Value, Less than 12 months | $ 1,712 | $ 305
Fair Value, Greater than 12 months | 2 | 0
Fair Value | 1,714 | 305
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 108 | 2
Unrealized Losses, Greater than 12 months | 1 | 1
Unrealized Losses | $ 109 | $ 3
Foreign securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 513 | 39
Number of Securities, Greater than 12 months | security | 0 | 0
Number of Securities | security | 513 | 39
Fair Value |  |
Fair Value, Less than 12 months | $ 630 | $ 75
Fair Value, Greater than 12 months | 0 | 0
Fair Value | 630 | 75
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 48 | 1
Unrealized Losses, Greater than 12 months | 0 | 0
Unrealized Losses | $ 48 | $ 1
Residential mortgage-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 14 | 30
Number of Securities, Greater than 12 months | security | 7 | 9
Number of Securities | security | 21 | 39
Fair Value |  |
Fair Value, Less than 12 months | $ 0 | $ 16
Fair Value, Greater than 12 months | 0 | 0
Fair Value | 0 | 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 | 21 | 16
Number of Securities, Greater than 12 months | security | 0 | 0
Number of Securities | security | 21 | 16
Fair Value |  |
Fair Value, Less than 12 months | $ 50 | $ 49
Fair Value, Greater than 12 months | 0 | 0
Fair Value | 50 | 49
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 1 | 0
Unrealized Losses, Greater than 12 months | 0 | 0
Unrealized Losses | $ 1 | $ 0
Other asset-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 589 | 138
Number of Securities, Greater than 12 months | security | 89 | 187
Number of Securities | security | 678 | 325
Fair Value |  |
Fair Value, Less than 12 months | $ 893 | $ 254
Fair Value, Greater than 12 months | 68 | 182
Fair Value | 961 | 436
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 67 | 1
Unrealized Losses, Greater than 12 months | 13 | 4
Unrealized Losses | $ 80 | $ 5
Redeemable preferred securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 6 |
Number of Securities, Greater than 12 months | security | 0 |
Number of Securities | security | 6 |
Fair Value |  |
Fair Value, Less than 12 months | $ 11 |
Fair Value, Greater than 12 months | 0 |
Fair Value | 11 |
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 1 |
Unrealized Losses, Greater than 12 months | 0 |
Unrealized Losses | $ 1 |

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