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Acquisitions and Divestitures - Divestitures (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale of land     $ 0 $ 0 $ 60
Gain on sale of land in Mexico     $ 0 $ 0 $ 97
MEXICO          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale of land $ 120        
Gain on sale of land in Mexico   $ 97      
Aftertax gain on sale of land   $ 63      
Impact of aftertax gain on sale per common share, diluted (in dollars per share)   $ 0.07      
MEXICO | Third Installment          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale of land $ 60