Derivative Instruments (Effect Of Derivative Instruments Not Designated As Hedges On Consolidated Statement Of Operations Summary) (Details) - Derivatives not designated as hedging instruments: - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 23, 2016	Jan. 24, 2015	Jan. 23, 2016	Jan. 24, 2015
Derivative Instruments, Gain (Loss) [Line Items]
GAINS (LOSSES) FOR THE THREE MONTHS ENDED	$ (93)	$ (30)	$ (95)	$ (105)
Foreign currency derivatives | Other income (loss), net
Derivative Instruments, Gain (Loss) [Line Items]
GAINS (LOSSES) FOR THE THREE MONTHS ENDED	(58)	(51)	(54)	(109)
Total return swaps—deferred compensation | Operating expenses
Derivative Instruments, Gain (Loss) [Line Items]
GAINS (LOSSES) FOR THE THREE MONTHS ENDED	(38)	13	(54)	0
Equity derivatives | Other income (loss), net
Derivative Instruments, Gain (Loss) [Line Items]
GAINS (LOSSES) FOR THE THREE MONTHS ENDED	$ 3	$ 8	$ 13	$ 4