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Investments - Unrealized Loss Position (Details) $ in Millions | Sep. 30, 2019 USD ($) security | Dec. 31, 2018 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities | security | 648 | 2,279
Fair Value | $ 790 | $ 2,409
Unrealized Losses | $ 13 | $ 36
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities | security | 8 | 8
Fair Value | $ 41 | $ 26
Unrealized Losses | $ 0 | $ 0
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities | security | 38 | 54
Fair Value | $ 53 | $ 86
Unrealized Losses | $ 1 | $ 1
U.S. corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities | security | 217 | 1,399
Fair Value | $ 254 | $ 1,431
Unrealized Losses | $ 7 | $ 16
Foreign securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities | security | 27 | 243
Fair Value | $ 39 | $ 314
Unrealized Losses | $ 0 | $ 3
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities | security | 31 | 45
Fair Value | $ 17 | $ 1
Unrealized Losses | $ 0 | $ 0
Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities | security | 327 | 516
Fair Value | $ 386 | $ 528
Unrealized Losses | $ 5 | $ 15
Redeemable preferred securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities | security |  | 14
Fair Value |  | $ 23
Unrealized Losses |  | $ 1

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