Financial Instruments (Schedule Of Changes In Cash Flow Hedges In Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 02, 2020	Jul. 28, 2019	Jul. 29, 2018
Derivative Instruments, Gain (Loss) [Line Items]
OCI before tax accumulated derivative gain (loss) beginning of period	$ (11)	$ (8)	$ (34)
OCI before tax accumulated derivative gain (loss) end of period	(8)	(11)	(8)
Foreign Exchange Forward Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
OCI, before Reclassifications, before Tax, Attributable to Parent	3	(3)	8
Foreign Exchange Forward Contracts [Member] | Cost Of Products Sold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(2)	(4)	5
Foreign Exchange Forward Contracts [Member] | Loss from discontinued operations [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	1	2	(4)
Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
OCI, before Reclassifications, before Tax, Attributable to Parent	0	0	15
Interest Rate Contract [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	$ 1	$ 2	$ 2