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Details of Income Statement Items (Expenses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Selling, transport and marketing expenses [Abstract]      
Transport $ 497 $ 475 $ 417
Cost of labor 122 119 113
Other 127 128 123
Selling, transport and marketing expenses 746 722 653
General and administrative expenses [Abstract]      
Cost of labor 170 188 150
Professional Services 49 77 103
Other costs 42 56 97
General and administrative expenses 261 321 350
Research and development expenses [Abstract]      
Cost of labor 40 48 54
Other costs 15 25 20
Research and development expenses, net $ 55 $ 73 $ 74