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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Valuation allowance |  |  |
Goodwill, Impairment Loss | $ 54 | $ 0 | $ 0
Tax Cuts and Jobs Act of 2017, Change in tax rate, deferred tax asset, income tax expense (benefit) |  | $ 36 |
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions | $ 7 |  |
Effective Income Tax Rate Reconciliation, Goodwill Impairment, Percent | (2.20%) | 0.00% | 0.00%
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] |  |  |
Valuation allowance |  |  |
Additions | $ 119 |  | $ 86
UK Gaming [Member] |  |  |
Valuation allowance |  |  |
Goodwill, Impairment Loss | $ 54 |  |

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