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Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Statutory U.S. federal income tax rate | $ (26) | $ 243 | $ 319
State income taxes, net of federal benefit | (7) | 7 | 7
Lower effective tax rate on international operations, net | (28) | (44) | (149)
Depletion | (5) | (6) | (8)
Exchange (gains) losses | (7) | (4) | 5
Provision to return and other adjustments | (4) | (9) | 6
Valuation allowance | 8 | (15) | (33)
Net impact of U.S. tax reform |  | (10) | 39
Stock-based compensation | (14) | (14) | (20)
Executive compensation limitation | 9 | 4 | 6
R&D credit | (6) | (5) | (1)
Uncertain tax positions | 7 | 2 | (6)
Other, net | 1 | 10 |
Total (benefit from) provision for income taxes | $ (72) | $ 159 | $ 165

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