Shareowners' Equity (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended			37 Months Ended	12 Months Ended
	Aug. 03, 2014	Jul. 28, 2013	Jul. 29, 2012	Aug. 03, 2014 June 2011 Program [Member]	Aug. 03, 2014 Treasury Stock [Member]	Jul. 28, 2013 Treasury Stock [Member]	Jul. 29, 2012 Treasury Stock [Member]	Aug. 03, 2014 Treasury Stock [Member] Shares Repurchased To Offset The Impact Of Dilution [Member]	Jul. 28, 2013 Treasury Stock [Member] Shares Repurchased To Offset The Impact Of Dilution [Member]	Jul. 29, 2012 Treasury Stock [Member] Shares Repurchased To Offset The Impact Of Dilution [Member]
Statement [Line Items]
Common Stock, Shares Authorized	560	560
Common Stock, Par or Stated Value Per Share	$ 0.0375	$ 0.0375
Preferred Stock, Shares Authorized	40	40
Treasury stock retired, shares		219				219
Authorized amount for shares repurchase				$ 1,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount				750
Treasury stock purchased, shares					2	4	13	2	4	13
Shares repurchased, value	$ 76	$ 153	$ 412	$ 250	$ 76	$ 153	$ 412