Restructuring Charges (Schedule Of Restructuring Activity And Related Reserves) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended								3 Months Ended	12 Months Ended
	Jul. 28, 2013	Jul. 29, 2012	Jul. 31, 2011	Jul. 28, 2013 2013 Initiatives [Member]	Jul. 28, 2013 2013 Initiatives [Member] Severance Pay And Benefits [Member]	Jul. 28, 2013 2013 Initiatives [Member] Asset Impairment Accelerated Depreciation [Member]	Jul. 28, 2013 2013 Initiatives [Member] Pension Plans, Defined Benefit [Member]	Jul. 28, 2013 2013 Initiatives [Member] Other Restructuring [Member]	Jul. 31, 2011 2011 Initiatives [Member]	Jul. 28, 2013 2011 Initiatives [Member]	Jul. 29, 2012 2011 Initiatives [Member]	Jul. 28, 2013 2011 Initiatives [Member] Severance Pay And Benefits [Member]	Jul. 29, 2012 2011 Initiatives [Member] Severance Pay And Benefits [Member]	Jul. 29, 2012 2011 Initiatives [Member] Asset Impairment Accelerated Depreciation [Member]	Jul. 28, 2013 2011 Initiatives [Member] Other Restructuring [Member]	Jul. 29, 2012 2011 Initiatives [Member] Other Restructuring [Member]	Jul. 29, 2012 2011 Initiatives [Member] Contract Termination, Charges Recorded Directly to the Income Statement [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 51	$ 7	$ 60	$ 51					$ 63	$ 0	$ 10			$ 1			$ 3
Restructuring Reserve [Roll Forward]
Accrued Balance at beginning of period										16	39	14	35		2	4
Restructuring and Related Cost, Incurred Cost				142	32	99	3	8		0	6	0	4		0	2
Cash Payments					(15)					(11)	(28)	(10)	(24)		(1)	(4)
Restructuring Reserve, Translation Adjustment										(1)	(1)	(1)	(1)
Accrued Balance at end of period					$ 17				$ 39	$ 4	$ 16	$ 3	$ 14		$ 1	$ 2