Segment Information - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) Segment	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Segment Reporting Disclosure [Line Items]
Property and equipment, net	$ 21,838	$ 16,967	$ 10,949
Number of segments | Segment	3
United States
Segment Reporting Disclosure [Line Items]
Property and equipment, net	$ 16,800	13,100	8,400
Rest of World
Segment Reporting Disclosure [Line Items]
Property and equipment, net	$ 5,000	$ 3,800	$ 2,500
Net Sales | Individual Product or Service Concentration Risk | Maximum
Segment Reporting Disclosure [Line Items]
Concentration Risk, Percentage	10.00%
Property, Plant and Equipment | Single Country Excluding U.S. Concentration Risk | Outside United States | Maximum
Segment Reporting Disclosure [Line Items]
Concentration Risk, Percentage	10.00%