Pension And Postretirement Benefits (Schedule of Change In Fair Value Of Pension Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 30, 2023	Jul. 31, 2022
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Plan Assets, Amount	$ 1,763
Defined Benefit Plan, Plan Assets, Amount	1,316	$ 1,763
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Plan Assets, Amount	1,763	2,220
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(1)	(272)
Defined Benefit Plan, Plan Assets, Contributions by Employer	1	0
Defined Benefit Plan, Plan Assets, Benefits Paid	(91)	(92)
Defined Benefit Plan, Plan Assets, Payment for Settlement	(352)	(89)
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	(4)	(4)
Defined Benefit Plan, Plan Assets, Amount	$ 1,316	$ 1,763