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Investments - Unrealized Loss Position (Details) $ in Millions | Dec. 31, 2019 USD ($) security | Dec. 31, 2018 USD ($) security
--- | --- | ---
Number of Securities |  |
Number of Securities, Less than 12 months | security | 522 | 2,279
Number of Securities, Greater than 12 months | security | 200 | 0
Number of Securities | security | 722 | 2,279
Fair Value |  |
Fair Value, Less than 12 months | $ 982 | $ 2,409
Fair Value, Greater than 12 months | 187 | 0
Fair Value | 1,169 | 2,409
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 6 | 36
Unrealized Losses, Greater than 12 months | 5 | 0
Unrealized Losses | $ 11 | $ 36
U.S. government securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 52 | 8
Number of Securities, Greater than 12 months | security | 0 | 0
Number of Securities | security | 52 | 8
Fair Value |  |
Fair Value, Less than 12 months | $ 168 | $ 26
Fair Value, Greater than 12 months | 0 | 0
Fair Value | 168 | 26
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 | 66 | 54
Number of Securities, Greater than 12 months | security | 2 | 0
Number of Securities | security | 68 | 54
Fair Value |  |
Fair Value, Less than 12 months | $ 115 | $ 86
Fair Value, Greater than 12 months | 5 | 0
Fair Value | 120 | 86
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 1 | 1
Unrealized Losses, Greater than 12 months | 0 | 0
Unrealized Losses | $ 1 | $ 1
U.S. corporate securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 181 | 1,399
Number of Securities, Greater than 12 months | security | 2 | 0
Number of Securities | security | 183 | 1,399
Fair Value |  |
Fair Value, Less than 12 months | $ 305 | $ 1,431
Fair Value, Greater than 12 months | 0 | 0
Fair Value | 305 | 1,431
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 2 | 16
Unrealized Losses, Greater than 12 months | 1 | 0
Unrealized Losses | $ 3 | $ 16
Foreign securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 39 | 243
Number of Securities, Greater than 12 months | security | 0 | 0
Number of Securities | security | 39 | 243
Fair Value |  |
Fair Value, Less than 12 months | $ 75 | $ 314
Fair Value, Greater than 12 months | 0 | 0
Fair Value | 75 | 314
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 1 | 3
Unrealized Losses, Greater than 12 months | 0 | 0
Unrealized Losses | $ 1 | $ 3
Residential mortgage-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 30 | 45
Number of Securities, Greater than 12 months | security | 9 | 0
Number of Securities | security | 39 | 45
Fair Value |  |
Fair Value, Less than 12 months | $ 16 | $ 1
Fair Value, Greater than 12 months | 0 | 0
Fair Value | 16 | 1
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 | 16 |
Number of Securities, Greater than 12 months | security | 0 |
Number of Securities | security | 16 |
Fair Value |  |
Fair Value, Less than 12 months | $ 49 |
Fair Value, Greater than 12 months | 0 |
Fair Value | 49 |
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 0 |
Unrealized Losses, Greater than 12 months | 0 |
Unrealized Losses | $ 0 |
Other asset-backed securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security | 138 | 516
Number of Securities, Greater than 12 months | security | 187 | 0
Number of Securities | security | 325 | 516
Fair Value |  |
Fair Value, Less than 12 months | $ 254 | $ 528
Fair Value, Greater than 12 months | 182 | 0
Fair Value | 436 | 528
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | 1 | 15
Unrealized Losses, Greater than 12 months | 4 | 0
Unrealized Losses | $ 5 | $ 15
Redeemable preferred securities |  |
Number of Securities |  |
Number of Securities, Less than 12 months | security |  | 14
Number of Securities, Greater than 12 months | security |  | 0
Number of Securities | security |  | 14
Fair Value |  |
Fair Value, Less than 12 months |  | $ 23
Fair Value, Greater than 12 months |  | 0
Fair Value |  | 23
Unrealized Losses |  |
Unrealized Losses, Less than 12 months |  | 1
Unrealized Losses, Greater than 12 months |  | 0
Unrealized Losses |  | $ 1

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