Taxes on Earnings Schedule Of Provision Of Income Taxes On Earnings Of Continuing Operations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Aug. 03, 2014	Jul. 28, 2013	Jul. 29, 2012
Income Tax Disclosure [Abstract]
Current Federal Tax Expense (Benefit)	$ 252	$ 268	$ 221
Current State and Local Tax Expense (Benefit)	30	24	29
Current Foreign Tax Expense (Benefit)	42	47	43
Current Income Tax Expense (Benefit)	324	339	293
Deferred Federal Income Tax Expense (Benefit)	32	(58)	31
Deferred State and Local Income Tax Expense (Benefit)	2	(6)	2
Deferred Foreign Income Tax Expense (Benefit)	(11)	0	(1)
Deferred Income Tax Expense (Benefit)	23	(64)	32
Income Tax Expense (Benefit)	347	275	325
Income (Loss) from Continuing Operations before Income Taxes, Domestic	995	815	918
Income (Loss) from Continuing Operations before Income Taxes, Foreign	78	140	131
Earnings before taxes	$ 1,073	$ 955	$ 1,049