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Segment and Related Information - Revenue by Geographic Region (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue $ 1,509 $ 1,482 $ 2,962 $ 2,823
U.S.        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue 922 910 1,813 1,750
European region        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue 360 339 706 636
Asia        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue 142 156 275 293
Rest of the world        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue $ 85 $ 77 $ 168 $ 144