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Income Taxes - Reconciliation of Uncertain Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Uncertain tax benefits |  |  |  |
Uncertain tax benefits | $ 30 | $ 34 | $ 26 | $ 30
Liability for uncertainty in income taxes, noncurrent |  |  | 30 | 33
Unrecognized tax benefits, income tax penalties expense | 1 |  |  |
Accrued interest and penalties related to unrecognized tax benefits |  |  | $ 4 | $ 3
Uncertain tax benefits reconciliation |  |  |  |
Balance as of January 1 | 30 | 34 |  |
Increase due to current year positions | 4 | 4 |  |
Decrease due to prior year positions | 0 | (8) |  |
Decrease due to settlements and payments | (8) | 0 |  |
Uncertain tax benefits as of December 31 | $ 26 | $ 30 |  |

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