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Investments - Unrealized Loss Position (Details) $ in Millions | Jun. 30, 2020 USD ($) security | Dec. 31, 2019 USD ($) security
--- | --- | ---
Number of Securities |  |
Number of Securities, Less than 12 months | security | 1,279 | 522
Number of Securities, Greater than 12 months | security | 109 | 200
Number of Securities | security | 1,388 | 722
Fair Value |  |
Fair Value, Less than 12 months | $ 1,684 | $ 982
Fair Value, Greater than 12 months | 84 | 187
Fair Value | 1,768 | 1,169
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 46 | 6
Unrealized Losses, Greater than 12 months | 7 | 5
Unrealized Losses | $ 53 | $ 11
U.S. government securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 22 | 52
Number of Securities, Greater than 12 months | security | 0 | 0
Number of Securities | security | 22 | 52
Fair Value |  |
Fair Value, Less than 12 months | $ 105 | $ 168
Fair Value, Greater than 12 months | 0 | 0
Fair Value | 105 | 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 | 83 | 66
Number of Securities, Greater than 12 months | security | 0 | 2
Number of Securities | security | 83 | 68
Fair Value |  |
Fair Value, Less than 12 months | $ 169 | $ 115
Fair Value, Greater than 12 months | 0 | 5
Fair Value | 169 | 120
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 2 | 1
Unrealized Losses, Greater than 12 months | 0 | 0
Unrealized Losses | $ 2 | $ 1
U.S. corporate securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 569 | 181
Number of Securities, Greater than 12 months | security | 8 | 2
Number of Securities | security | 577 | 183
Fair Value |  |
Fair Value, Less than 12 months | $ 481 | $ 305
Fair Value, Greater than 12 months | 3 | 0
Fair Value | 484 | 305
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 17 | 2
Unrealized Losses, Greater than 12 months | 1 | 1
Unrealized Losses | $ 18 | $ 3
Foreign securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 171 | 39
Number of Securities, Greater than 12 months | security | 0 | 0
Number of Securities | security | 171 | 39
Fair Value |  |
Fair Value, Less than 12 months | $ 245 | $ 75
Fair Value, Greater than 12 months | 0 | 0
Fair Value | 245 | 75
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 11 | 1
Unrealized Losses, Greater than 12 months | 0 | 0
Unrealized Losses | $ 11 | $ 1
Residential mortgage-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 21 | 30
Number of Securities, Greater than 12 months | security | 4 | 9
Number of Securities | security | 25 | 39
Fair Value |  |
Fair Value, Less than 12 months | $ 52 | $ 16
Fair Value, Greater than 12 months | 0 | 0
Fair Value | 52 | 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 | 13 | 16
Number of Securities, Greater than 12 months | security | 0 | 0
Number of Securities | security | 13 | 16
Fair Value |  |
Fair Value, Less than 12 months | $ 65 | $ 49
Fair Value, Greater than 12 months | 0 | 0
Fair Value | 65 | 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 | 400 | 138
Number of Securities, Greater than 12 months | security | 97 | 187
Number of Securities | security | 497 | 325
Fair Value |  |
Fair Value, Less than 12 months | $ 567 | $ 254
Fair Value, Greater than 12 months | 81 | 182
Fair Value | 648 | 436
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 16 | 1
Unrealized Losses, Greater than 12 months | 6 | 4
Unrealized Losses | $ 22 | $ 5

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