Segment Reporting and Information about Geographic Areas - Schedule of Revenues by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 11,958	$ 6,036	$ 22,347	$ 12,021
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	5,205	3,090	9,629	5,858
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,859	1,400	5,902	2,300
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 3,894	$ 1,546	$ 6,816	$ 3,863