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Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Statutory U.S. federal income tax rate $ 38 $ (26) $ 243
State income taxes, net of federal benefit (11) (7) 7
Lower effective tax rate on international operations, net (34) (28) (44)
Depletion (6) (5) (6)
Exchange gains   (7) (4)
Provision to return and other adjustments (37) (4) (9)
Valuation allowance 13 8 (15)
Net impact of U.S. tax reform     (10)
Stock-based compensation   (14) (14)
Executive compensation limitation 1 9 4
R&D credit (7) (6) (5)
Uncertain tax positions (1) 7 2
Other, net 4 1 10
Total (benefit from) provision for income taxes $ (40) $ (72) $ 159