Pension And Postretirement Benefits (Schedule Of Components of Benefit Expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 30, 2022	Jan. 31, 2021	Jan. 30, 2022	Jan. 31, 2021
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 5	$ 4	$ 9	$ 9
Defined Benefit Plan, Interest Cost	11	10	21	20
Expected return on plan assets	(32)	(30)	(62)	(61)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	0	0
Defined Benefit Plan, Actuarial Gain (Loss)	10	30	4	34
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(26)	(46)	(36)	(66)
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	0	0	0	0
Defined Benefit Plan, Interest Cost	1	1	2	2
Expected return on plan assets	0	0	0	0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(1)	(1)	(1)	(2)
Defined Benefit Plan, Actuarial Gain (Loss)	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 0	$ 0	$ 1	$ 0