Taxes on Earnings Taxes on Earnings (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 28, 2019	Jul. 29, 2018	Jul. 30, 2017
Operating Loss Carryforwards	$ 438
Operating Loss Carryforwards, Subject to Expiration	390
Operating Loss Carryforwards, Valuation Allowance	165
Operating Loss Carryforwards, Not Subject to Expiration	48
Valuation Allowance, Deferred Tax Asset, Change in Amount	294	$ 13	$ 2
Deferred Tax Assets, Valuation Allowance	427	133
Undistributed Earnings of Foreign Subsidiaries	156
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	17	23	19
Income Tax Examination, Penalties and Interest Expense	(1)	1	$ 4
Other Liabilities [Member]
Income Tax Examination, Penalties and Interest Accrued	4	5
Capital Loss Carryforward [Member]
Tax Credit Carryforward, Amount	1,096
Operating Loss Carryforwards, Valuation Allowance	$ 1,060
Earliest Tax Year [Member]
Operating Loss Carryforwards, Expiration Date	Aug. 03, 2020
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	23
Deferred Tax Assets, Valuation Allowance	$ 13	$ 15
State and Local Jurisdiction [Member] | Earliest Tax Year [Member]
Tax Credit Carryforward, Expiration Date	Jul. 31, 2021	Jul. 31, 2021
State and Local Jurisdiction [Member] | Latest Tax Year [Member]
Tax Credit Carryforward, Expiration Date	Jul. 31, 2031	Jul. 31, 2031