Pension And Postretirement Benefits (Schedule of Change In Fair Value Of Pension Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2022	Aug. 01, 2021
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Plan Assets, Amount	$ 2,220
Defined Benefit Plan, Plan Assets, Amount	1,763	$ 2,220
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Plan Assets, Amount	2,220	2,120
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(272)	276
Defined Benefit Plan, Plan Assets, Contributions by Employer	0	2
Defined Benefit Plan, Plan Assets, Benefits Paid	(92)	(138)
Defined Benefit Plan, Plan Assets, Payment for Settlement	(89)	(53)
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	(4)	13
Defined Benefit Plan, Plan Assets, Amount	$ 1,763	$ 2,220