Taxes on Earnings Schedule Of Provision Of Income Taxes On Earnings Of Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 30, 2017	Jul. 31, 2016	Aug. 02, 2015
Income Tax Disclosure [Abstract]
Current Federal Tax Expense (Benefit)	$ 238	$ 235	$ 246
Current State and Local Tax Expense (Benefit)	39	34	31
Current Foreign Tax Expense (Benefit)	36	47	55
Current Income Tax Expense (Benefit)	313	316	332
Deferred Federal Income Tax Expense (Benefit)	77	(17)	(47)
Deferred State and Local Income Tax Expense (Benefit)	2	0	1
Deferred Foreign Income Tax Expense (Benefit)	14	(13)	(3)
Deferred Income Tax Expense (Benefit)	93	(30)	(49)
Income Tax Expense (Benefit)	$ 406	$ 286	$ 283