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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Income Tax Disclosure [Abstract] |  |  |  |
Effective income tax rate reconciliation, percent |  |  | 43.90% | 26.50%
Effective income tax rate reconciliation, including discrete items, percent | 54.50% | 35.30% | 40.60% | 34.00%
Discrete income tax charge | $ 10 | $ 26 | $ (25) | $ 49
Change in prior year taxes | 9 |  | 9 |
Interest accruals for potential underpayment of taxes | 2 |  | 2 |
Change in deferred tax assets valuation allowance | (1) |  | (13) |
Charge related to establishing tax reserve |  | 59 |  | 59
Prior year adjustments related to a change in jurisdiction |  | 13 |  | 13
Income tax benefit from reversal of foreign tax reserve | $ 38 |  | (25) | 38
Tax charge (benefit) from reduction in estimate of the then provisional impact of the Tax Cut and Jobs Act of 2017 |  | $ (8) |  | 13
Income tax charge for a number of small items |  |  | $ 2 |
Income tax charge related to stock compensation |  |  |  | $ 2

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