Financial Instruments (Schedule Of Changes In Cash Flow Hedges In Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified							3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended				6 Months Ended
	Jan. 26, 2014	Oct. 27, 2013	Jul. 28, 2013	Jan. 27, 2013	Oct. 28, 2012	Jul. 29, 2012	Jan. 26, 2014 Foreign Exchange Forward Contracts [Member]	Jan. 27, 2013 Foreign Exchange Forward Contracts [Member]	Jan. 26, 2014 Foreign Exchange Forward Contracts [Member]	Jan. 27, 2013 Foreign Exchange Forward Contracts [Member]	Jan. 26, 2014 Foreign Exchange Forward Contracts [Member] Cost Of Products Sold [Member]	Jan. 27, 2013 Foreign Exchange Forward Contracts [Member] Cost Of Products Sold [Member]	Jan. 26, 2014 Foreign Exchange Forward Contracts [Member] Cost Of Products Sold [Member]	Jan. 27, 2013 Foreign Exchange Forward Contracts [Member] Cost Of Products Sold [Member]	Jan. 26, 2014 Foreign Exchange Forward Contracts [Member] Other Expenses/Income [Member]	Jan. 27, 2013 Foreign Exchange Forward Contracts [Member] Other Expenses/Income [Member]	Jan. 26, 2014 Foreign Exchange Forward Contracts [Member] Other Expenses/Income [Member]	Jan. 27, 2013 Foreign Exchange Forward Contracts [Member] Other Expenses/Income [Member]	Jan. 26, 2014 Interest Rate Contract [Member]	Jan. 27, 2013 Interest Rate Contract [Member]	Jan. 26, 2014 Interest Rate Contract [Member] Interest Expense [Member]	Jan. 27, 2013 Interest Rate Contract [Member] Interest Expense [Member]	Jan. 26, 2014 Interest Rate Contract [Member] Interest Expense [Member]	Jan. 27, 2013 Interest Rate Contract [Member] Interest Expense [Member]	Jan. 26, 2014 Currency Swap [Member]	Jan. 27, 2013 Currency Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
OCI derivative gain/(loss) at beginning of year	$ 9	$ 5	$ 8	$ (11)	$ (16)	$ (16)
Derivative instruments gain (loss) recognized in OCI							2	(1)	3	(1)									2	5					(2)	5
Derivative instrument (gain) loss reclassified											0	0	(1)	(1)	(1)	0	(1)	0			1	1	2	2
OCI derivative gain/(loss) at end of period	$ 9	$ 5	$ 8	$ (11)	$ (16)	$ (16)