Employee Benefit Plans (Summary of Share-Based Awards available for Grant) (Details) In Millions, unless otherwise specified	12 Months Ended
	Jul. 26, 2014	Jul. 27, 2013	Jul. 28, 2012
Employee Stock Benefit Plans [Abstract]
Balance at beginning of fiscal year	228	218	255
Restricted stock, stock units, and other share-based awards granted	(98)	(102)	(95)
Share-based awards canceled/forfeited/expired	36	115	64
Additional shares reserved	135	0	0
Shares withheld for taxes and not issued	6	0	0
Other	3	(3)	(6)
Balance at end of fiscal year	310	228	218