Taxes On Earnings (Schedule Of Deferred Tax Liabilities And Assets) (Details) (USD $) In Millions, unless otherwise specified	Jul. 29, 2012	Jul. 31, 2011
Income Tax Expense (Benefit) [Abstract]
Depreciation	$ 279	$ 253
Amortization	474	474
Other	20	14
Deferred tax liabilities	773	741
Benefits and compensation	311	307
Pension benefits	194	93
Tax loss carryforwards	69	84
Capital loss carryforwards	117	122
Other	79	83
Gross deferred tax assets	770	689
Deferred tax asset valuation allowance	(142)	(156)
Net deferred tax assets	628	533
Net deferred tax liability	$ 145	$ 208