Accumulated Other Comprehensive Loss, Net of Tax (Detail) (USD $)	3 Months Ended			3 Months Ended		3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Mar. 31, 2013 Accumulated Translation Adjustment	Dec. 31, 2012 Accumulated Translation Adjustment	Mar. 31, 2013 Accumulated Net Unrealized Investment Gain (Loss)	Dec. 31, 2012 Accumulated Net Unrealized Investment Gain (Loss)	Mar. 31, 2013 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Dec. 31, 2012 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Mar. 31, 2013 Accumulated Defined Benefit Plans Adjustment	Dec. 31, 2012 Accumulated Defined Benefit Plans Adjustment	Mar. 31, 2013 Non-controlling Interest in VMware	Dec. 31, 2012 Non-controlling Interest in VMware
Accumulated other comprehensive income (loss) [Line Items]
Taxes (benefits) related to unrealized net gains (losses) in accumulated other comprehensive income	$ 76,060,000	$ 190,910,000				$ 36,000,000	$ 36,600,000	$ (66,900,000)	$ (67,200,000)	$ (87,300,000)	$ (87,300,000)
Accumulated other comprehensive loss, net	(241,971,000)		(208,273,000)	(39,991,000)	(8,786,000)	60,443,000	63,485,000	(108,153,000)	(108,645,000)	(153,172,000)	(153,172,000)	(1,098,000)	(1,155,000)
Other comprehensive income before reclassifications	(24,563,000)			(31,205,000)		719,000		5,866,000		0		57,000
Net losses (gains) reclassified from accumulated other comprehensive income	(9,135,000)			0		(3,761,000)		(5,374,000)		0		0
Net current period other comprehensive income	$ (33,698,000)			$ (31,205,000)		$ (3,042,000)		$ 492,000		$ 0		$ 57,000