Employee Benefit Plans (Summary of Share-Based Awards available for Grant) (Details) - shares shares in Millions	12 Months Ended
	Jul. 30, 2016	Jul. 25, 2015	Jul. 26, 2014
Employee Stock Benefit Plans [Abstract]
Balance at beginning of fiscal year	276	310	228
Restricted stock, stock units, and other share-based awards granted	(96)	(101)	(98)
Share-based awards canceled/forfeited/expired	30	40	36
Additional shares reserved	0	0	135
Shares withheld for taxes and not issued	30	27	6
Other	2	0	3
Balance at end of fiscal year	242	276	310