Segment and Related Information - Revenue by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 1,846	$ 1,689	$ 5,575	$ 4,964
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	1,076	1,021	3,384	2,978
European region
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	455	411	1,310	1,205
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	214	174	585	522
Rest of the world
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 101	$ 83	$ 296	$ 259