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	12 Months Ended
	Jul. 25, 2015	Jul. 26, 2014	Jul. 27, 2013
Hedge Underlying Gain Loss [Line Items]
GAINS (LOSSES) ON DERIVATIVE INSTRUMENTS FOR THE YEARS ENDED	$ 110	$ (74)	$ (233)
GAINS (LOSSES) RELATED TO HEDGED ITEMS FOR THE YEARS ENDED	(113)	72	233
Equity derivatives | Other income (loss), net
Hedge Underlying Gain Loss [Line Items]
GAINS (LOSSES) ON DERIVATIVE INSTRUMENTS FOR THE YEARS ENDED	56	(72)	(155)
GAINS (LOSSES) RELATED TO HEDGED ITEMS FOR THE YEARS ENDED	(56)	72	155
Interest rate derivatives | Interest expense
Hedge Underlying Gain Loss [Line Items]
GAINS (LOSSES) ON DERIVATIVE INSTRUMENTS FOR THE YEARS ENDED	54	(2)	(78)
GAINS (LOSSES) RELATED TO HEDGED ITEMS FOR THE YEARS ENDED	$ (57)	$ 0	$ 78