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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Income tax expense | $ 81 | $ 80 |  |
Effective income tax rate percent | 33.30% | 21.70% |  |
Valuation allowance | $ 88 |  |  | $ 66
Forecast |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Effective income tax rate percent |  |  | 24.00% |

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