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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