Taxes on Earnings Schedule Of Provision Of Income Taxes On Earnings Of Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 28, 2019	Jul. 29, 2018	Jul. 30, 2017
Income Tax Disclosure [Abstract]
Current Federal Tax Expense (Benefit)	$ 104	$ 93	$ 241
Current State and Local Tax Expense (Benefit)	19	26	39
Current Foreign Tax Expense (Benefit)	5	11	2
Current Income Tax Expense (Benefit)	128	130	282
Deferred Federal Income Tax Expense (Benefit)	19	(26)	97
Deferred State and Local Income Tax Expense (Benefit)	7	14	2
Deferred Foreign Income Tax Expense (Benefit)	(3)	(12)	11
Deferred Income Tax Expense (Benefit)	23	(24)	110
Income Tax Expense (Benefit)	$ 151	$ 106	$ 392