Taxes on Earnings Taxes on Earnings (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 02, 2020	Jul. 28, 2019	Jul. 29, 2018
Operating Loss Carryforwards	$ 361
Valuation Allowance, Deferred Tax Asset, Change in Amount	(305)	$ 294	$ 13
Deferred Tax Assets, Valuation Allowance	122	427
Undistributed Earnings of Foreign Subsidiaries	18
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	18	17	$ 23
Indefinite Life [Member]
Operating Loss Carryforwards	39
Definite Life [Member]
Operating Loss Carryforwards	322
Gross Amount of Operating Loss Carryforwards with a Full Valuation Allowance [Member]
Operating Loss Carryforwards	134
Other Liabilities [Member]
Income Tax Examination, Penalties and Interest Accrued	4	4
Capital Loss Carryforward [Member]
Tax Credit Carryforward, Amount	$ 382
Earliest Tax Year [Member]
Operating Loss Carryforwards, Expiration Date	Aug. 01, 2021
Latest Tax Year [Member]
Operating Loss Carryforwards, Expiration Date	Jul. 31, 2037
State and Local Jurisdiction [Member]
Deferred Tax Assets, Tax Credit Carryforwards, Other	$ 13	13
Deferred Tax Assets, Valuation Allowance	$ 13	$ 13
State and Local Jurisdiction [Member] | Earliest Tax Year [Member]
Tax Credit Carryforward, Expiration Date	Aug. 01, 2021
State and Local Jurisdiction [Member] | Latest Tax Year [Member]
Tax Credit Carryforward, Expiration Date	Jul. 31, 2031