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Acquisitions, Intangible Assets and Goodwill (Acquisition) (Details) - Newgistics - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Business Acquisition [Line Items]          
Acquisition of business $ 471        
Revenues from Newgistics   $ 126   $ 384  
Pro forma revenue     $ 106   $ 340