Changes In Fair Value of Level 3 Financial Assets (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
LenovoEMC
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of the period	$ 35	$ 33
Realized gain (loss) included in other income (expense)	0	0
Balance, end of the period	35	33
Auction Rate Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of the period	60	70
Calls at par value	0	(1)
Other than Temporary Impairment Losses, Investments	0	(1)
(Increase) decrease in previously recognized unrealized losses included in other comprehensive income	(1)	0
Balance, end of the period	$ 59	$ 68