Related Party Transactions (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		0 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Jun. 30, 2012 EMC [Member]	Jun. 30, 2011 EMC [Member]	Jun. 30, 2012 EMC [Member]	Jun. 30, 2011 EMC [Member]	Dec. 31, 2011 EMC [Member]	Jun. 30, 2012 Cost Reimbursement from Related Party Pursuant to Support Agreement [Member] EMC [Member]	Jun. 30, 2011 Cost Reimbursement from Related Party Pursuant to Support Agreement [Member] EMC [Member]	Jun. 30, 2012 Cost Reimbursement from Related Party Pursuant to Support Agreement [Member] EMC [Member]	Jun. 30, 2011 Cost Reimbursement from Related Party Pursuant to Support Agreement [Member] EMC [Member]	Jun. 30, 2012 Product Sold Pursuant To Reseller Arrangement [Member] EMC [Member]	Jun. 30, 2011 Product Sold Pursuant To Reseller Arrangement [Member] EMC [Member]	Jun. 30, 2012 Product Sold Pursuant To Reseller Arrangement [Member] EMC [Member]	Jun. 30, 2011 Product Sold Pursuant To Reseller Arrangement [Member] EMC [Member]	Jun. 30, 2012 Professional Service [Member] EMC [Member]	Jun. 30, 2011 Professional Service [Member] EMC [Member]	Jun. 30, 2012 Professional Service [Member] EMC [Member]	Jun. 30, 2011 Professional Service [Member] EMC [Member]	Jun. 30, 2012 Server And Desktop Products And Services [Member] EMC [Member]	Jun. 30, 2011 Server And Desktop Products And Services [Member] EMC [Member]	Jun. 30, 2012 Server And Desktop Products And Services [Member] EMC [Member]	Jun. 30, 2011 Server And Desktop Products And Services [Member] EMC [Member]	Jun. 30, 2012 Storage Systems And Software [Member] EMC [Member]	Jun. 30, 2011 Storage Systems And Software [Member] EMC [Member]	Jun. 30, 2012 Storage Systems And Software [Member] EMC [Member]	Jun. 30, 2011 Storage Systems And Software [Member] EMC [Member]	Apr. 30, 2010 Ionix [Member] EMC [Member]	Jun. 30, 2011 Ionix [Member] EMC [Member]
Payment of Income Tax to Related Party						$ 0	$ 0	$ 0	$ 0
Related Party Transaction, Amounts of Transaction											16,400,000	12,200,000	30,900,000	12,200,000
Cash consideration for acquisition of software product technology	0	7,973,000	0	20,463,000																											175,000,000
Contingent obligations paid																																12,500,000
Revenue from related party transaction															45,600,000	14,200,000	80,600,000	34,200,000	23,600,000	16,400,000	42,300,000	30,800,000	2,100,000	500,000	3,800,000	1,000,000
Unearned revenue	2,942,390,000		2,942,390,000		2,708,418,000										107,600,000		107,600,000		6,700,000		6,700,000		22,700,000		22,700,000
Cost of purchase																											5,900,000	7,500,000	23,900,000	13,300,000
Related Party Transaction, Expenses from Transactions with Related Party						21,200,000	18,000,000	49,000,000	42,700,000
Interest expense with EMC, net						1,200,000	1,000,000	2,400,000	1,900,000
Due from (to) EMC, Net, Current						61,654,000		61,654,000		73,799,000
Due from EMC, Current						88,600,000		88,600,000
Due to EMC, Current						$ 26,900,000		$ 26,900,000
Related Party Transaction Other Than Tax Obligation Due To Or From Related Cash Settlement Period			60 days