Acquisitions (Details) (USD $) In Millions, except Share data, unless otherwise specified				1 Months Ended	9 Months Ended	1 Months Ended	9 Months Ended				9 Months Ended						9 Months Ended
	Sep. 30, 2014	Jul. 31, 2014	Dec. 31, 2013	Jul. 31, 2014 Oculus	Sep. 30, 2014 Oculus	Jul. 31, 2014 Oculus Class B Common Stock	Sep. 30, 2014 Oculus Acquired Technology	Jul. 31, 2014 Oculus Acquired Technology	Jul. 31, 2014 Oculus Tradename and Other	Jul. 31, 2014 Oculus In Process Research and Development	Sep. 30, 2014 Oculus Minimum Tradename and Other	Sep. 30, 2014 Oculus Maximum Tradename and Other	Sep. 30, 2014 Other Current Period Acquisition	Sep. 30, 2014 Other Current Period Acquisition Acquired Technology	Sep. 30, 2014 Other Current Period Acquisition Tradename and Other	Sep. 30, 2014 Other Current Period Acquisition In Process Research and Development	Sep. 30, 2014 Other Current Period Acquisition Minimum Acquired Technology	Sep. 30, 2014 Other Current Period Acquisition Minimum Tradename and Other	Sep. 30, 2014 Other Current Period Acquisition Maximum Acquired Technology	Sep. 30, 2014 Other Current Period Acquisition Maximum Tradename and Other	Jul. 31, 2014 Cash Oculus
Business Acquisition [Line Items]
Business Acquisition, number of shares issued						23,000,000
Payments to acquire business				$ 400
Contingent liability, shares issuable (in shares)						3,000,000
Contingent liability		169		169																	60
Business Combination, Consideration Transferred [Abstract]
Cash				400
Common stock				1,601
Less: post-acquisition share-based compensation and other compensation expense				(297)
Less: cash and promissory notes acquired on acquisition date				(20)
Total purchase consideration, excluding contingent consideration				1,684
Contingent consideration		169		169																	60
Purchase consideration				1,853
Share-based compensation recognized				13
Deferred compensation expense to be recognized					284
Deferred compensation, Requisite service period					4 years
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Finite and Indefinite-lived intangible assets:								235	132	60				62	87	0
Finite-lived intangible asset, Useful life							5 years				2 years	7 years					3 years	3 years	5 years	5 years
Net assets acquired				0									104
Deferred tax liabilities				(107)									(41)
Net assets acquired				320									212
Goodwill	2,612		839	1,533									244
Total fair value				$ 1,853									$ 456