Changes In Fair Value of Level 3 Financial Assets (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Other than Temporary Impairment Losses, Investments			$ (33)	$ 0
LenovoEMC
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of the period	35	33	35	33
Realized gain (loss) included in other income (expense)	1	1	1	1
Balance, end of the period	36	34	36	34
Auction Rate Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of the period	60	68	60	70
Calls at par value	0	0	0	(1)
Other than Temporary Impairment Losses, Investments	0	0	0	(1)
(Increase) decrease in previously recognized unrealized losses included in other comprehensive income	(1)	0	(1)	0
Balance, end of the period	$ 59	$ 68	$ 59	$ 68