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
	Feb. 01, 2015	Jan. 26, 2014	Feb. 01, 2015	Jan. 26, 2014
Derivative Instruments, Gain (Loss) [Line Items]
OCI derivative gain/(loss) at beginning of year	$ (4)	$ 5	$ (4)	$ 8
Reclassification adjustment for (gains) losses included in net earnings, before tax	0	0	1	0
OCI derivative gain/(loss) at end of period	(36)	9	(36)	9
Foreign Exchange Forward Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments gain (loss) recognized in OCI	10	2	13	3
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	0	0	0	(1)
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	(1)	(1)	(1)	(1)
Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments gain (loss) recognized in OCI	(42)	2	(46)	(2)
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	$ 2	$ 2