Pension And Postretirement Benefits (Schedule Of Components of Benefit Expense) (Details) - USD ($) $ in Millions	3 Months Ended
	Nov. 01, 2015	Nov. 02, 2014
Defined Benefit Plan Disclosure [Line Items]
Recognized net actuarial loss	$ 128
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	7	$ 7
Defined Benefit Plan, Interest Cost	25	27
Expected return on plan assets	(39)	(44)
Recognized net actuarial loss	136	0
Defined Benefit Plan, Net Periodic Benefit Cost	129	(10)
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	4	4
Expected return on plan assets	0	0
Recognized net actuarial loss	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	$ 4	$ 4