Taxes On Earnings (Schedule Of Provision For Income Taxes On Earnings ) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 29, 2012	Jul. 31, 2011	Aug. 01, 2010
Income Tax Expense (Benefit) [Abstract]
Currently payable, Federal	$ 213	$ 215	$ 253
Currently payable, State	29	27	46
Current payable, Non-U.S.	55	78	45
Currently payable	297	320	344
Deferred, Federal	37	47	38
Deferred, State	2	(2)	1
Deferred, Non-U.S.	6	1	15
Deferred tax expense	45	46	54
Taxes on earnings	342	366	398
Earnings before income taxes, United States	922	944	1,051
Earnings before income taxes, Non-U.S.	184	224	191
Earnings before taxes	$ 1,106	$ 1,168	$ 1,242