Subsequent Events (Details) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Sep. 30, 2012 Nicira [Member]
Subsequent Event [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 102,166,000	$ 189,138,000	$ 102,166,000	$ 204,088,000	$ 1,050,000,000
Business Acquisition, Cost of Acquired Entity, Other Noncash Consideration					$ 210,000,000