Pension And Postretirement Benefits (Schedule of Change in Benefit Obligation) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2022	Aug. 01, 2021	Aug. 02, 2020
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Benefit Obligation	$ 2,186	$ 2,366
Defined Benefit Plan, Service Cost	16	18	$ 19
Defined Benefit Plan, Interest Cost	49	41	65
Defined Benefit Plan, Benefit Obligation, Actuarial Loss (Gain)	(310)	(43)
Defined Benefit Plan, Benefits Paid	(106)	(152)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement	(89)	(53)
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change	(6)	(2)
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation (Gain) Loss	(3)	11
Defined Benefit Plan, Benefit Obligation	1,737	2,186	2,366
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Benefit Obligation	222	244
Defined Benefit Plan, Service Cost	0	0	1
Defined Benefit Plan, Interest Cost	3	4	6
Defined Benefit Plan, Benefit Obligation, Actuarial Loss (Gain)	(36)	(6)
Defined Benefit Plan, Benefits Paid	(17)	(20)
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	$ 172	$ 222	$ 244