Pension And Postretirement Benefits (Schedule Of Components of Benefit Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Nov. 02, 2014	Oct. 27, 2013
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 7	$ 11
Interest cost	27	29
Expected return on plan assets	(44)	(45)
Recognized net actuarial loss	21	19
Net periodic benefit expense	11	14
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1
Interest cost	4	4
Expected return on plan assets	0	0
Recognized net actuarial loss	3	3
Net periodic benefit expense	$ 7	$ 8