Segment Information - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) Segment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Disclosure [Line Items]
Number of segments | Segment	3
Property and equipment, net	$ 29,114	$ 21,838	$ 16,967
United States
Segment Reporting Disclosure [Line Items]
Property and equipment, net	22,000	16,800	13,100
Rest of World
Segment Reporting Disclosure [Line Items]
Property and equipment, net	$ 7,100	$ 5,000	$ 3,800