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Acquisitions and Divestitures - Divestitures (Details 1) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from the sale of land in Mexico     $ 60 $ 0
Gain on sale of land in Mexico     97 $ 0
MEXICO        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from the sale of land in Mexico $ 60 $ 120    
Gain on sale of land in Mexico 97   $ 97  
Gain on sale of land in Mexico, net of tax $ 63