Commitments and Contingencies Other Agreements (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Feb. 28, 2014
Business Acquisition [Line Items]
Percentage of transaction consideration		25.00%
Period for closing price	10 days
WhatsApp
Business Acquisition [Line Items]
Cash to be paid		$ 4,000,000,000
Potential liabilities related to merger agreement contract termination fee, cash		1,000,000,000
Oculus
Business Acquisition [Line Items]
Cash to be paid	400,000,000
Potential contingent liabilities, cash	60,000,000
Class A Common Stock | WhatsApp
Business Acquisition [Line Items]
Shares to be issued		183,865,778
Potential liabilities related to merger agreement contract termination fee, value of shares		$ 1,000,000,000
Class B Common Stock | Oculus
Business Acquisition [Line Items]
Shares to be issued	23,071,377
Potential contingent liabilities, number of shares	3,460,706
Restricted Stock Units (RSUs) | WhatsApp
Business Acquisition [Line Items]
Shares to be issued		45,966,445