Pension And Postretirement Benefits (Schedule of Change In Fair Value Of Pension Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 01, 2021	Aug. 02, 2020
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Plan Assets, Amount	$ 2,120
Defined Benefit Plan, Plan Assets, Amount	2,220	$ 2,120
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Plan Assets, Amount	2,120	2,153
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	276	230
Defined Benefit Plan, Plan Assets, Contributions by Employer	(2)	(2)
Defined Benefit Plan, Plan Assets, Benefits Paid	(138)	(135)
Defined Benefit Plan, Plan Assets, Payment for Settlement	(53)	(41)
Defined Benefit Plan, Plan Assets, Divestiture	0	(86)
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	13	(3)
Defined Benefit Plan, Plan Assets, Amount	$ 2,220	$ 2,120