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Details of Income Statement Items (Expenses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Selling, transport and marketing expenses [Abstract]      
Land and marine transportation $ 515 $ 509 $ 553
Cost of labor 134 133 125
Other 117 125 120
Selling, transport and marketing expenses 766 767 798
General and administrative expenses [Abstract]      
Cost of labor 136 153 172
Professional Services 32 42 44
Other 64 59 41
General and administrative expenses 232 254 257
Research and development expenses [Abstract]      
Cost of labor 40 36 38
Other 14 14 17
Research and development expenses, net $ 54 $ 50 $ 55