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Segment Information and Concentrations - Revenue from External Customers by Products and Services (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Revenue from External Customer [Line Items]    
Product revenue $ 548 $ 604
Professional and installation services revenue 209 208
Support services revenue 687 664
Total revenue $ 1,444 $ 1,476