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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Operating Loss Carryforwards [Line Items] |  |  |  |
Income tax expense | $ (80) | $ (81) |  |
Effective income tax rate percent | 21.40% | 33.30% |  |
Valuation allowance | $ 70 |  |  | $ 70
Forecast |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Effective income tax rate percent |  |  | 23.00% |

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