Employee Benefit Plans (Summary Of Restricted Stock And Stock Unit Activity) (Detail) (Restricted Stock, USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended	12 Months Ended
	Jan. 25, 2014	Jul. 27, 2013
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested balance at beginning period (in shares)	143,000,000	128,000,000
Granted and assumed	58,000,000	72,000,000
Vested	(38,000,000)	(46,000,000)
Canceled/forfeited	(7,000,000)	(11,000,000)
Unvested balance at ending period (in shares)	156,000,000	143,000,000
Beginning balance, weighted-average grant date fair value per share	$ 18.80	$ 19.46
Granted and assumed, weighed-average grant date fair value per share	$ 20.83	$ 18.52
Vested, weighted-average grant date fair value per share	$ 19.50	$ 20.17
Canceled/forfeited, weighted-average grant date fair value per share	$ 18.46	$ 18.91
Ending balance, weighted-average grant date fair value per share	$ 19.41	$ 18.80
Vested, aggregated fair market value	$ 903	$ 932