Financial Instruments (Schedule Of Changes In Cash Flow Hedges In Other Comprehensive Income) (Details) (USD $) In Millions				12 Months Ended
	Jul. 31, 2011	Aug. 01, 2010	Aug. 02, 2009	Jul. 31, 2011 Foreign Exchange Contracts [Member]	Aug. 01, 2010 Foreign Exchange Contracts [Member]	Jul. 31, 2011 Foreign Exchange Contracts [Member] Other Expenses/Income [Member]	Aug. 01, 2010 Foreign Exchange Contracts [Member] Other Expenses/Income [Member]	Jul. 31, 2011 Foreign Exchange Contracts [Member] Cost of Products Sold [Member]	Aug. 01, 2010 Foreign Exchange Contracts [Member] Cost of Products Sold [Member]	Jul. 31, 2011 Foreign Exchange Contracts [Member] Interest Expense [Member]	Aug. 01, 2010 Foreign Exchange Contracts [Member] Interest Expense [Member]	Jul. 31, 2011 Cross-currency Swap Contracts [Member]	Aug. 01, 2010 Cross-currency Swap Contracts [Member]	Jul. 31, 2011 Interest Rate Swaps [Member]	Aug. 01, 2010 Interest Rate Swaps [Member]	Jul. 31, 2011 Commodity Derivative Contracts [Member]	Aug. 01, 2010 Commodity Derivative Contracts [Member]
OCI derivative gain/(loss) at beginning of year	$ (31)	$ (28)	$ (31)
Derivative instruments gain (loss) recognized in OCI				(12)	(5)								4		(14)		1
Derivative instrument gain (loss) reclassified						2	(1)	4	17	3	1
OCI derivative gain/(loss) at end of year	$ (31)	$ (28)	$ (31)