Derivative Instruments (Effect Of Derivative Instruments Designated As Fair Value Hedges And Underlying Hedged Items On Consolidated Statements Of Operations) (Detail) (Derivatives Designated As Fair Value Hedging Instruments, USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 27, 2013	Jul. 28, 2012	Jul. 30, 2011
Hedge Underlying Gain Loss [Line Items]
Gains (losses) on derivative instruments	$ (233)	$ 74	$ 74
Gains (losses) related to hedged items	233	(76)	(77)
Equity Derivatives | Other income (loss), net
Hedge Underlying Gain Loss [Line Items]
Gains (losses) on derivative instruments	(155)	(4)	0
Gains (losses) related to hedged items	155	4	0
Interest Rate Derivatives | Interest Expense
Hedge Underlying Gain Loss [Line Items]
Gains (losses) on derivative instruments	(78)	78	74
Gains (losses) related to hedged items	$ 78	$ (80)	$ (77)