Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Remaining Useful Lives (in years)	5 years 1 month 28 days
Gross Carrying Amount	$ 4,463	$ 4,438
Accumulated Amortization	1,277	569
Net Carrying Amount	3,186	3,869
Indefinite-lived Intangible Assets [Line Items]
Total intangible assets, Gross	4,523	4,498
Accumulated Amortization	(1,277)	(569)
Total intangible assets, Net	3,246	3,929
Amortization expense	730	319	$ 145
In-process research and development (IPR&D)
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 60	60
Acquired users
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Remaining Useful Lives (in years)	5 years 8 months 25 days
Gross Carrying Amount	$ 2,056	2,056
Accumulated Amortization	382	85
Net Carrying Amount	1,674	1,971
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (382)	(85)
Acquired technology
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Remaining Useful Lives (in years)	3 years 4 months
Gross Carrying Amount	$ 831	813
Accumulated Amortization	310	144
Net Carrying Amount	521	669
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (310)	(144)
Acquired patents
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Remaining Useful Lives (in years)	6 years 6 months
Gross Carrying Amount	$ 785	773
Accumulated Amortization	333	239
Net Carrying Amount	452	534
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (333)	(239)
Trade names
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Remaining Useful Lives (in years)	4 years 1 month 3 days
Gross Carrying Amount	$ 629	632
Accumulated Amortization	163	46
Net Carrying Amount	466	586
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (163)	(46)
Other
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Remaining Useful Lives (in years)	3 years 6 months 4 days
Gross Carrying Amount	$ 162	164
Accumulated Amortization	89	55
Net Carrying Amount	73	109
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (89)	$ (55)