Shareholders' Equity (Stock Repurchase Program) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Jul. 26, 2014		Jul. 27, 2013
Stockholders' Equity Note [Abstract]
Cumulative Shares Repurchased, Beginning balance (in shares)	3,868		3,740
Repurchase of Common Stock During Period (in shares)	420	[1]	128	[1]
Cumulative Shares Repurchased, Ending balance (in shares)	4,288		3,868
Cumulative Weighted-Average Price per Share, Beginning balance, dollars per share	$ 20.40		$ 20.36
Repurchase of common stock under the stock repurchase program, Weighted-Average Price per Share, dollars per share	$ 22.71		$ 21.63
Cumulative Weighted-Average Price per Share, Ending balance, dollars per share	$ 20.63		$ 20.40
Cumulative Amount Repurchased, Beginning balance	$ 78,906		$ 76,133
Stock Repurchased and Retired During Period, Shares	9,539	[1]	2,773	[1]
Cumulative Amount Repurchased, Ending balance	$ 88,445		$ 78,906

[1] Includes stock repurchases of $126 million, which were pending settlement as of July 26, 2014. There were no stock repurchases pending settlement as of July 27, 2013.