Taxes on Earnings (Schedule Of Provision For Income Taxes On Earnings From Continuing Operations) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 28, 2013	Jul. 29, 2012	Jul. 31, 2011
Current Federal Tax Expense (Benefit)	$ 268	$ 221	$ 218
Current State and Local Tax Expense (Benefit)	24	29	29
Current Foreign Tax Expense (Benefit)	47	43	64
Current Income Tax Expense (Benefit)	339	293	311
Deferred Federal Income Tax Expense (Benefit)	(58)	31	44
Deferred State and Local Income Tax Expense (Benefit)	(6)	2	(2)
Deferred Foreign Income Tax Expense (Benefit)	0	(1)	(2)
Deferred Income Tax Expense (Benefit)	(64)	32	40
Income Tax Expense (Benefit)	275	325	351
Income (Loss) from Continuing Operations before Income Taxes, Domestic	815	918	941
Income (Loss) from Continuing Operations before Income Taxes, Foreign	140	131	159
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	$ 955	$ 1,049	$ 1,100