Taxes on Earnings Schedule Of Provision Of Income Taxes On Earnings Of Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 29, 2018	Jul. 30, 2017	Jul. 31, 2016
Income Tax Disclosure [Abstract]
Current Federal Tax Expense (Benefit)	$ 84	$ 238	$ 235
Current State and Local Tax Expense (Benefit)	13	39	34
Current Foreign Tax Expense (Benefit)	47	36	47
Current Income Tax Expense (Benefit)	144	313	316
Deferred Federal Income Tax Expense (Benefit)	(122)	77	(17)
Deferred State and Local Income Tax Expense (Benefit)	(2)	2	0
Deferred Foreign Income Tax Expense (Benefit)	(9)	14	(13)
Deferred Income Tax Expense (Benefit)	(133)	93	(30)
Income Tax Expense (Benefit)	$ 11	$ 406	$ 286