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Segment and Enterprise-wide Information - Concentration (Details) - Amazon.com - Sales Revenue, Net - Customer Concentration Risk - customer
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Concentration Risk [Line Items]        
Concentration risk, percentage 17.20% 13.60% 12.10%  
Number of significant customers       0