Pension And Postretirement Benefits (Schedule Of Components of Benefit Expense) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2021	Nov. 01, 2020
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actuarial Gain (Loss)	$ (6)	$ 4
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	4	5
Defined Benefit Plan, Interest Cost	10	10
Expected return on plan assets	(30)	(31)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0
Defined Benefit Plan, Actuarial Gain (Loss)	(6)	4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(10)	(20)
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	0	0
Defined Benefit Plan, Interest Cost	1	1
Expected return on plan assets	0	0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	(1)
Defined Benefit Plan, Actuarial Gain (Loss)	0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 1	$ 0