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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Tax Contingency [Line Items]    
Estimated effective tax rate 25.90% 22.50%
Effective tax rate 19.40% 29.10%
Net tax discrete items (benefit) expense $ (63) $ 73
Net favorable tax benefit from audit settlements and expirations of statutes of limitations $ 60  
Additional transition tax liability recognized as an adjustment to prior provisional estimate   94
Argentina Tax Authority    
Income Tax Contingency [Line Items]    
Benefit from pending tax refund claim   $ 18