Shareholders' Equity (Stock Repurchase Program) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Jul. 27, 2013	Jul. 28, 2012
Shareholders' Equity [Abstract]
Cumulative Shares Repurchased, Beginning balance, shares	3,740	3,478
Repurchase of Common Stock During Period, (Shares)	128	262
Cumulative Shares Repurchased, Ending balance, shares	3,868	3,740
Cumulative Weighted-Average Price per Share, Beginning balance, dollars per share	$ 20.36	$ 20.64
Repurchase of common stock under the stock repurchase program, Weighted-Average Price per Share, dollars per share	$ 21.63	$ 16.64
Cumulative Weighted-Average Price per Share, Ending balance, dollars per share	$ 20.40	$ 20.36
Cumulative Amount Repurchased, Beginning balance	$ 76,133	$ 71,773
Stock Repurchased and Retired During Period, Shares	2,773	4,360
Cumulative Amount Repurchased, Ending balance	$ 78,906	$ 76,133