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
	May 03, 2015	Apr. 27, 2014	May 03, 2015	Apr. 27, 2014
Derivative Instruments, Gain (Loss) [Line Items]
OCI derivative gain/(loss) at beginning of year	$ (36)	$ 9	$ (4)	$ 8
Reclassification adjustment for (gains) losses included in net earnings, before tax	(1)	1	0	1
OCI derivative gain/(loss) at end of period	(25)	5	(25)	5
Foreign Exchange Forward Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments gain (loss) recognized in OCI	(9)	(1)	4	2
Foreign Exchange Forward Contracts [Member] | Cost Of Products Sold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification adjustment for (gains) losses included in net earnings, before tax	(2)	(1)	(2)	(2)
Foreign Exchange Forward Contracts [Member] | Other Expenses Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification adjustment for (gains) losses included in net earnings, before tax	0	1	(1)	0
Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments gain (loss) recognized in OCI	21	(4)	(25)	(6)
Interest Rate Contract [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification adjustment for (gains) losses included in net earnings, before tax	$ 1	$ 1	$ 3	$ 3