Restructuring Charges (Schedule Of Pre-Tax Charge And Remaining Costs) (Details) (USD $) In Millions, unless otherwise specified	13 Months Ended
	Jul. 29, 2012
Restructuring Cost and Reserve [Line Items]
Total Program	$ 75
Recognized as of end of period	(73)
Remaining Costs to be Recognized	2
Severance Pay And Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Total Program	43
Recognized as of end of period	(41)
Remaining Costs to be Recognized	2
Asset Impairment/Accelerated Depreciation [Member]
Restructuring Cost and Reserve [Line Items]
Total Program	23
Recognized as of end of period	(23)
Remaining Costs to be Recognized	0
Other Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total Program	9
Recognized as of end of period	(9)
Remaining Costs to be Recognized	$ 0