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Details of Income Statement Items (Expenses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Selling, transport and marketing expenses [Abstract]      
Land and marine transportation $ 509 $ 553 $ 497
Cost of labor 133 125 122
Other 125 120 127
Selling, transport and marketing expenses 767 798 746
General and administrative expenses [Abstract]      
Cost of labor 153 172 170
Professional Services 42 44 49
Other 59 41 42
General and administrative expenses 254 257 261
Research and development expenses [Abstract]      
Cost of labor 36 38 40
Other 14 17 15
Research and development expenses, net $ 50 $ 55 $ 55