Pension And Postretirement Benefits (Schedule of Change In Fair Value Of Pension Assets) (Details) (Pension Plan, Defined Benefit [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Aug. 03, 2014	Jul. 28, 2013
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 2,275	$ 2,118
Defined Benefit Plan, Actual Return on Plan Assets	276	246
Defined Benefit Plan, Contributions by Employer	46	87
Defined Benefit Plan, Benefits Paid, from Plan Assets	(179)	(161)
Defined Benefit Plan, Settlements, Plan Assets	(43)	0
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	(11)	(15)
Defined Benefit Plan, Fair Value of Plan Assets	$ 2,364	$ 2,275