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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Tax Contingency [Line Items]        
Provisional discrete net tax expense (benefit) $ (2)   $ 87  
Increase (decrease) in liability for transition tax due to U.S. tax reform (8)   $ 86 $ 0
Tax expense for other provisional tax updates $ 6      
Estimated effective tax rate     21.90% 25.80%
Effective tax rate 5.60% 16.20% 22.80% 19.20%
Total unfavorable discrete items benefit (expense) $ 32 $ 47 $ 14 $ 83
Net favorable tax audit settlements and expirations of statutes of limitations 27 $ 46 43 62
Benefit relating to the U.S. domestic production activities deduction       $ 16
Foreign Tax Authority | Argentina Tax Authority        
Income Tax Contingency [Line Items]        
Benefit from pending tax refund claim $ 22   $ 22