Changes In Fair Value of Level 3 Financial Assets (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
LenovoEMC
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of the period	$ 33		$ 33
Realized gain (loss) included in other income (expense)	1		1
Balance, end of the period	34		34
Auction Rate Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of the period	68	79	70	75
Calls at par value	0	0	1	0
Other than Temporary Impairment Losses, Investments	0	(2)	1	2
(Increase) decrease in previously recognized unrealized losses included in other comprehensive income	0	(3)	0	1
Balance, end of the period	$ 68	$ 74	$ 68	$ 74