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	Aug. 01, 2021	Aug. 02, 2020
Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract]
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation	$ 156	$ 1,783
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation	154	1,763
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets	$ 0	$ 1,527