Accumulated Other Comprehensive Loss, Net of Tax (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended			9 Months Ended		9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 Accumulated Translation Adjustment	Dec. 31, 2012 Accumulated Translation Adjustment	Sep. 30, 2013 Accumulated Net Unrealized Investment Gain (Loss)	Dec. 31, 2012 Accumulated Net Unrealized Investment Gain (Loss)	Sep. 30, 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]	Sep. 30, 2013 Accumulated Defined Benefit Plans Adjustment	Dec. 31, 2012 Accumulated Defined Benefit Plans Adjustment	Sep. 30, 2013 Non-controlling Interest in VMware	Dec. 31, 2012 Non-controlling Interest in VMware
Accumulated other comprehensive income (loss) [Line Items]
Provision for income tax	$ 181	$ 185	$ 474	$ 590				$ 17	$ 37	$ (67)	$ (67)	$ (87)	$ (87)
Accumulated other comprehensive loss, net	(291)		(291)		(208)	(53)	(9)	27	64	(112)	(109)	(153)	(153)	0	(1)
Other comprehensive income (loss) before reclassifications			(67)			(44)		(30)		6		0		1
Net losses (gains) reclassified from accumulated other comprehensive income			(16)			0		(7)		(9)		0		0
Net current period other comprehensive income (loss)			$ (83)			$ (44)		$ (37)		$ (3)		$ 0		$ 1