Segment Reporting and Information about Geographic Areas - Schedule of Revenues by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 5,985	$ 4,541
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,768	2,330
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	900	779
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 2,317	$ 1,432