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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Tax Contingency [Line Items]        
Estimated annual effective tax rate     25.50% 21.90%
Effective tax rate 23.10% 6.00% 21.20% 25.10%
Net tax discrete items (benefit) expense $ (8) $ (32) $ (71) $ 41
Net benefit from the release of uncertain tax positions due to the expirations of statutes of limitations and audit settlements 24 27 $ 84 43
Tax expense from U.S. state legislative changes $ 15      
Additional transition tax liability recognized as an adjustment to prior provisional estimate       86
Argentina Tax Authority        
Income Tax Contingency [Line Items]        
Benefit from pending tax refund claim   $ 22   $ 22