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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Unrecognized Tax Benefits |  |  |
Gross unrecognized tax benefit balances | $ 16 | $ 34 | $ 97
Reductions based on settlements with taxing authority | (21) | $ (73) | $ (22)
Unrecognized Tax Benefits, Other Disclosures |  |  |
Unrecognized tax benefits, if recognized, which would affect effective tax rate | 16 |  |
Estimate of increase in unrecognized tax benefits in next year | 3 |  |
Unrecognized tax benefits balance reasonably possible next year | $ 19 |  |

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