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. 30, 2016	Jul. 25, 2015	Jul. 26, 2014
Hedge Underlying Gain Loss [Line Items]
GAINS (LOSSES) ON DERIVATIVE INSTRUMENTS FOR THE YEARS ENDED	$ 175	$ 110	$ (74)
GAINS (LOSSES) RELATED TO HEDGED ITEMS FOR THE YEARS ENDED	(169)	(113)	72
Equity derivatives | Other income (loss), net
Hedge Underlying Gain Loss [Line Items]
GAINS (LOSSES) ON DERIVATIVE INSTRUMENTS FOR THE YEARS ENDED	0	56	(72)
GAINS (LOSSES) RELATED TO HEDGED ITEMS FOR THE YEARS ENDED	0	(56)	72
Interest rate derivatives | Interest expense
Hedge Underlying Gain Loss [Line Items]
GAINS (LOSSES) ON DERIVATIVE INSTRUMENTS FOR THE YEARS ENDED	175	54	(2)
GAINS (LOSSES) RELATED TO HEDGED ITEMS FOR THE YEARS ENDED	$ (169)	$ (57)	$ 0