Financial Instruments (Schedule Of Changes In Cash Flow Hedges In Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified					3 Months Ended
	Oct. 28, 2012	Jul. 29, 2012	Oct. 30, 2011	Jul. 31, 2011	Oct. 28, 2012 Foreign Exchange Forward Contracts [Member]	Oct. 30, 2011 Foreign Exchange Forward Contracts [Member]	Oct. 28, 2012 Foreign Exchange Forward Contracts [Member] Cost Of Products Sold [Member]	Oct. 30, 2011 Foreign Exchange Forward Contracts [Member] Cost Of Products Sold [Member]	Oct. 28, 2012 Foreign Exchange Forward Contracts [Member] Other Expenses/Income [Member]	Oct. 30, 2011 Foreign Exchange Forward Contracts [Member] Other Expenses/Income [Member]	Oct. 28, 2012 Cross Currency Interest Rate Contract [Member]	Oct. 30, 2011 Cross Currency Interest Rate Contract [Member]	Oct. 28, 2012 Interest Rate Swap [Member] Interest Expense [Member]	Oct. 30, 2011 Interest Rate Swap [Member] Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
OCI derivative gain/(loss) at beginning of year	$ (16)	$ (16)	$ (22)	$ (31)
Derivative instruments gain (loss) recognized in OCI					0	7					0	(1)
Derivative instrument gain (loss) reclassified							(1)	1	0	1			1	1
OCI derivative gain/(loss) at end of year	$ (16)	$ (16)	$ (22)	$ (31)