Taxes on Earnings Schedule of Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Millions	Jul. 28, 2019	Jul. 29, 2018
Income Tax Disclosure [Abstract]
Deferred Tax Liabilities, Property, Plant and Equipment	$ 336	$ 342
Deferred Tax Liabilities, Goodwill and Intangible Assets	877	868
Deferred Tax Liabilities, Other	16	35
Deferred Tax Liabilities, Gross	1,229	1,245
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits	157	144
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions	46	24
Deferred Tax Assets, Operating Loss Carryforwards	43	65
Deferred Tax Assets, Capital Loss Carryforwards	287	88
Deferred Tax Asset, Parent's Basis in Discontinued Operation	116	0
Deferred Tax Assets, Other	82	92
Deferred Tax Assets, Gross	731	413
Deferred Tax Assets, Valuation Allowance	(427)	(133)
Deferred Tax Assets, Net of Valuation Allowance	304	280
Deferred Tax Liabilities, Net	$ 925	$ 965