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Segment, Other Supplemental Information and Concentrations - Schedule of Revenue by Geographical Area (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue $ 1,836 $ 1,899 $ 2,164
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue 921 953 1,018
Americas (excluding United States)      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue 104 104 108
EMEA      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue 485 492 587
APJ      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue $ 326 $ 350 $ 451