Pension And Postretirement Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 30, 2011	Oct. 31, 2010
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 14	$ 14
Interest cost	31	30
Expected return on plan assets	(45)	(44)
Recognized net actuarial loss	18	18
Net periodic benefit expense	18	18
Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Interest cost	4	4
Expected return on plan assets
Recognized net actuarial loss	2	2
Net periodic benefit expense	7	7
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution to pension plans	55
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution to pension plans	4
Expected contribution to pension plans remaining in fiscal year 2012	$ 10