Derivative Instruments (Effect Of Derivative Instruments Designated As Fair Value Hedges And Underlying Hedged Items On Consolidated Statements Of Operations) (Details) (Derivatives Designated as Fair Value Hedging Instruments, USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 26, 2014	Jul. 27, 2013	Jul. 28, 2012
Hedge Underlying Gain Loss [Line Items]
GAINS (LOSSES) ON DERIVATIVE INSTRUMENTS FOR THE YEARS ENDED	$ (74)	$ (233)	$ 74
GAINS (LOSSES) RELATED TO HEDGED ITEMS FOR THE YEARS ENDED	72	233	(76)
Equity derivatives | Other income (loss), net
Hedge Underlying Gain Loss [Line Items]
GAINS (LOSSES) ON DERIVATIVE INSTRUMENTS FOR THE YEARS ENDED	(72)	(155)	(4)
GAINS (LOSSES) RELATED TO HEDGED ITEMS FOR THE YEARS ENDED	72	155	4
Interest rate derivatives | Interest expense
Hedge Underlying Gain Loss [Line Items]
GAINS (LOSSES) ON DERIVATIVE INSTRUMENTS FOR THE YEARS ENDED	(2)	(78)	78
GAINS (LOSSES) RELATED TO HEDGED ITEMS FOR THE YEARS ENDED	$ 0	$ 78	$ (80)