Shareholders' Equity (Stock Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jul. 25, 2015		Jul. 26, 2014
Stockholders' Equity Note [Abstract]
Cumulative Shares Repurchased, Beginning balance (in shares)	4,288		3,868
Repurchase of Common Stock During Period (in shares)	155	[1]	420	[2]
Cumulative Shares Repurchased, Ending balance (in shares)	4,443		4,288
Cumulative Weighted Average Price Per Share Of Stock Repurchased, Value	$ 20.63		$ 20.40
Cumulative weighted average price per share repurchased	27.22		22.71
Cumulative Weighted Average Price Per Share Of Stock Repurchased, Value	$ 20.86		$ 20.63
Cumulative Stock Repurchased and Retired Value	$ 88,445		$ 78,906
Stock Repurchased and Retired During Period, Value	4,234	[1]	9,539	[2]
Cumulative Stock Repurchased and Retired Value	$ 92,679		$ 88,445

[1] Includes stock repurchases of $36 million, which were pending settlement as of July 25, 2015.

[2] Includes stock repurchases of $126 million, which were pending settlement as of July 26, 2014.