Financial Instruments (Schedule Of Changes In Cash Flow Hedges In Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified				12 Months Ended
	Jul. 28, 2013	Jul. 29, 2012	Jul. 31, 2011	Jul. 28, 2013 Foreign Exchange Forward Contracts [Member]	Jul. 29, 2012 Foreign Exchange Forward Contracts [Member]	Jul. 28, 2013 Foreign Exchange Forward Contracts [Member] Cost Of Products Sold [Member]	Jul. 29, 2012 Foreign Exchange Forward Contracts [Member] Cost Of Products Sold [Member]	Jul. 28, 2013 Foreign Exchange Forward Contracts [Member] Other Expenses/Income [Member]	Jul. 29, 2012 Foreign Exchange Forward Contracts [Member] Other Expenses/Income [Member]	Jul. 28, 2013 Interest Rate Contract [Member]	Jul. 29, 2012 Interest Rate Contract [Member]	Jul. 28, 2013 Interest Rate Contract [Member] Interest Expense [Member]	Jul. 29, 2012 Interest Rate Contract [Member] Interest Expense [Member]	Jul. 28, 2013 Currency Swap [Member]	Jul. 29, 2012 Currency Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
OCI derivative gain/(loss) at beginning of year	$ 8	$ (16)	$ (31)
Derivative instruments gain (loss) recognized in OCI				0	13					19	2			1	0
Derivative instrument (gain) loss reclassified						1	(1)	(1)	(2)			4	3
OCI derivative gain/(loss) at end of year	$ 8	$ (16)	$ (31)