Restructuring Charges (Schedule Of Restructuring Activity And Related Reserves) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			12 Months Ended
	Oct. 28, 2012	Oct. 30, 2011	Jul. 31, 2011	Jul. 29, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 22	$ 2
2013 Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	20
Restructuring and Related Cost, Incurred Cost	43
Accrued Balance at end of period	20
2013 Initiatives [Member] | Severance Pay And Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	20
Accrued Balance at end of period	20
2013 Initiatives [Member] | Asset Impairment/Accelerated Depreciation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	21
2013 Initiatives [Member] | Contract Termination, Charges Recorded Directly to the Income Statement [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2
2011 Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Accrued Balance at beginning of period	16
Restructuring charges		2	63	10
Cash Payments	(3)
Accrued Balance at end of period	13			16
2011 Initiatives [Member] | Severance Pay And Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Accrued Balance at beginning of period	14
Cash Payments	(3)
Accrued Balance at end of period	11
2011 Initiatives [Member] | Other Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Accrued Balance at end of period	$ 2			$ 2