Pension And Postretirement Benefits (Schedule Of Components of Benefit Expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 31, 2016	Feb. 01, 2015	Jan. 31, 2016	Feb. 01, 2015
Defined Benefit Plan Disclosure [Line Items]
Recognized net actuarial loss	$ (7)		$ 121
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	7	$ 7	14	$ 14
Defined Benefit Plan, Interest Cost	25	26	50	53
Expected return on plan assets	(36)	(43)	(75)	(87)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	0	0
Recognized net actuarial loss	(24)	0	112	0
Defined Benefit Plan, Net Periodic Benefit Cost	(28)	(10)	101	(20)
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	1	1	1	1
Defined Benefit Plan, Interest Cost	4	4	8	8
Expected return on plan assets	0	0	0	0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(1)	(1)	(1)	(1)
Recognized net actuarial loss	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	$ 4	$ 4	$ 8	$ 8