Pension And Postretirement Benefits (Schedule of Change In Fair Value Of Pension Assets) (Details) - Pension Plan, Defined Benefit [Member] - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2016	Aug. 02, 2015
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets	$ 2,316	$ 2,364
Defined Benefit Plan, Actual Return on Plan Assets	54	143
Defined Benefit Plan, Contributions by Employer	2	5
Defined Benefit Plan, Benefits Paid, from Plan Assets	(106)	(141)
Defined Benefit Plan, Settlements, Plan Assets	(160)	0
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	5	(55)
Defined Benefit Plan, Fair Value of Plan Assets	$ 2,111	$ 2,316