Share Repurchase Programs (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended							3 Months Ended	12 Months Ended		3 Months Ended
	Jul. 29, 2012	Jul. 31, 2011	Aug. 01, 2010	Jul. 29, 2012 Capital Stock In Treasury [Member]	Jul. 31, 2011 Capital Stock In Treasury [Member]	Aug. 01, 2010 Capital Stock In Treasury [Member]	Jul. 29, 2012 June 2011 Program [Member]	Jul. 31, 2011 June 2011 Program [Member] Capital Stock In Treasury [Member]	Jul. 31, 2011 June 2008 Program [Member]	Aug. 01, 2010 June 2008 Program [Member]	Jul. 27, 2008 June 2008 Program [Member] Capital Stock In Treasury [Member]
Statement [Line Items]
Capital Stock, Shares Authorized	560	560
Capital stock, par value	$ 0.0375	$ 0.0375
Preferred stock, shares authorized	40	40
Authorized amount for shares repurchase								$ 1,000			$ 1,200
Shares repurchased, shares				13	21	14
Shares repurchased, value	(412)	(728)	(472)	(412)	(728)	(472)	(250)		(550)	(250)
Stock Repurchase Program, Remaining Authorized Repurchase Amount							$ 750