Pension And Postretirement Benefits (Schedule Of Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets) (Details) (Pension Plan, Defined Benefit [Member], USD $) In Millions, unless otherwise specified	Aug. 03, 2014	Jul. 28, 2013
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit Obligation	$ 269	$ 1,817
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation	257	1,791
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets	$ 92	$ 1,625