Taxes on Earnings Schedule of Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Millions	Jul. 29, 2018	Jul. 30, 2017
Income Tax Disclosure [Abstract]
Deferred Tax Liabilities, Property, Plant and Equipment	$ 342	$ 355
Deferred Tax Liabilities, Goodwill and Intangible Assets	868	521
Deferred Tax Liabilities, Other	35	20
Deferred Tax Liabilities, Gross	1,245	896
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits	144	241
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions	24	98
Deferred Tax Assets, Operating Loss Carryforwards	65	36
Deferred Tax Assets, Capital Loss Carryforwards	88	92
Deferred Tax Assets, Other	92	95
Deferred Tax Assets, Gross	413	562
Deferred Tax Assets, Valuation Allowance	(133)	(120)
Deferred Tax Assets, Net of Valuation Allowance	280	442
Deferred Tax Liabilities, Net	$ 965	$ 454