Pension And Postretirement Benefits (Schedule of Change in Benefit Obligation) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 30, 2023	Jul. 31, 2022	Aug. 01, 2021
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement	$ (245)
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Benefit Obligation	1,737	$ 2,186
Defined Benefit Plan, Service Cost	13	16	$ 18
Defined Benefit Plan, Interest Cost	73	49	41
Defined Benefit Plan, Benefit Obligation, Actuarial Loss (Gain)	(108)	(310)
Defined Benefit Plan, Benefits Paid	(104)	(106)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement	(352)	(89)
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change	0	(6)
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation (Gain) Loss	(2)	(3)
Defined Benefit Plan, Benefit Obligation	1,257	1,737	2,186
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Benefit Obligation	172	222
Defined Benefit Plan, Service Cost	0	0	0
Defined Benefit Plan, Interest Cost	7	3	4
Defined Benefit Plan, Benefit Obligation, Actuarial Loss (Gain)	(9)	(36)
Defined Benefit Plan, Benefits Paid	(17)	(17)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement	0	0
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change	0	0
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation (Gain) Loss	0	0
Defined Benefit Plan, Benefit Obligation	$ 153	$ 172	$ 222