Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Total intangible assets, gross	$ 4,524		$ 4,523
Total intangible assets, net	3,067		3,246
Amortization expense	$ 180	$ 179
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in years)	4 years 10 months 23 days
Gross Carrying Amount	$ 4,524		4,463
Accumulated Amortization	(1,457)		(1,277)
Net Carrying Amount	3,067		3,186
In-process research and development (IPR&D)
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 0		60
Acquired users
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in years)	5 years 6 months
Gross Carrying Amount	$ 2,056		2,056
Accumulated Amortization	(456)		(382)
Net Carrying Amount	$ 1,600		1,674
Acquired technology
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in years)	3 years
Gross Carrying Amount	$ 892		831
Accumulated Amortization	(354)		(310)
Net Carrying Amount	$ 538		521
Acquired patents
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in years)	6 years 4 months 24 days
Gross Carrying Amount	$ 785		785
Accumulated Amortization	(356)		(333)
Net Carrying Amount	$ 429		452
Trade names
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in years)	3 years 9 months 17 days
Gross Carrying Amount	$ 629		629
Accumulated Amortization	(193)		(163)
Net Carrying Amount	$ 436		466
Other
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in years)	3 years 6 months
Gross Carrying Amount	$ 162		162
Accumulated Amortization	(98)		(89)
Net Carrying Amount	$ 64		$ 73