Taxes on Earnings Schedule of Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Millions	Jul. 30, 2017	Jul. 31, 2016
Income Tax Disclosure [Abstract]
Deferred Tax Liabilities, Property, Plant and Equipment	$ 355	$ 362
Deferred Tax Liabilities, Goodwill and Intangible Assets	521	541
Deferred Tax Liabilities, Other	20	23
Deferred Tax Liabilities, Gross	896	926
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits	241	266
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions	98	185
Deferred Tax Assets, Operating Loss Carryforwards	36	37
Deferred Tax Assets, Capital Loss Carryforwards	92	88
Deferred Tax Assets, Other	95	113
Deferred Tax Assets, Gross	562	689
Deferred Tax Assets, Valuation Allowance	(120)	(118)
Deferred Tax Assets, Net of Valuation Allowance	442	571
Deferred Tax Liabilities, Net	$ 454	$ 355