Financial Instruments (Schedule Of Changes In Cash Flow Hedges In Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified							3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended				9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Apr. 27, 2014	Jan. 26, 2014	Jul. 28, 2013	Apr. 28, 2013	Jan. 27, 2013	Jul. 29, 2012	Apr. 27, 2014 Foreign Exchange Forward Contracts [Member]	Apr. 28, 2013 Foreign Exchange Forward Contracts [Member]	Apr. 27, 2014 Foreign Exchange Forward Contracts [Member]	Apr. 28, 2013 Foreign Exchange Forward Contracts [Member]	Apr. 27, 2014 Foreign Exchange Forward Contracts [Member] Cost Of Products Sold [Member]	Apr. 28, 2013 Foreign Exchange Forward Contracts [Member] Cost Of Products Sold [Member]	Apr. 27, 2014 Foreign Exchange Forward Contracts [Member] Cost Of Products Sold [Member]	Apr. 28, 2013 Foreign Exchange Forward Contracts [Member] Cost Of Products Sold [Member]	Apr. 27, 2014 Foreign Exchange Forward Contracts [Member] Other Expenses/Income [Member]	Apr. 28, 2013 Foreign Exchange Forward Contracts [Member] Other Expenses/Income [Member]	Apr. 27, 2014 Interest Rate Contract [Member]	Apr. 28, 2013 Interest Rate Contract [Member]	Apr. 27, 2014 Interest Rate Contract [Member]	Apr. 28, 2013 Interest Rate Contract [Member]	Apr. 27, 2014 Interest Rate Contract [Member] Interest Expense [Member]	Apr. 28, 2013 Interest Rate Contract [Member] Interest Expense [Member]	Apr. 27, 2014 Interest Rate Contract [Member] Interest Expense [Member]	Apr. 28, 2013 Interest Rate Contract [Member] Interest Expense [Member]	Apr. 27, 2014 Currency Swap [Member]	Apr. 28, 2013 Currency Swap [Member]	Apr. 27, 2014 Currency Swap [Member]	Apr. 28, 2013 Currency Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
OCI derivative gain/(loss) at beginning of year	$ 5	$ 9	$ 8	$ (16)	$ (11)	$ (16)
Derivative instruments gain (loss) recognized in OCI							(1)	0	2	(1)							(4)	(6)	0	1					0	1	(6)	(1)
Derivative instrument (gain) loss reclassified											(1)	(1)	(2)	(2)	1	0					1	1	3	3
OCI derivative gain/(loss) at end of period	$ 5	$ 9	$ 8	$ (16)	$ (11)	$ (16)