Taxes on Earnings Taxes on Earnings (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 29, 2018	Jul. 30, 2017	Jul. 31, 2016	Jul. 28, 2019
TCJA of 2017, Incomplete Accounting, Change in Tax Rate, Deferred Tax Liability, Provisional Income Tax Expense (Benefit)	$ (179)
Transition Tax For Accumulated Foreign Earnings, Provisional Income Tax Expense	53
Operating Loss Carryforwards	671
Operating Loss Carryforwards, Subject to Expiration	634
Operating Loss Carryforwards, Not Subject to Expiration	37
Operating Loss Carryforwards, Valuation Allowance	213
Valuation Allowance, Deferred Tax Asset, Change in Amount	13	$ 2	$ (4)
Deferred Tax Assets, Valuation Allowance	133	120
Undistributed Earnings of Foreign Subsidiaries	956
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	26	43	42
Income Tax Examination, Penalties and Interest Expense		4	$ 3
Scenario, Forecast [Member]
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions				$ 7
Accounts Receivable [Member]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		5
Other Liabilities [Member]
Income Tax Examination, Penalties and Interest Accrued	5	5
Capital Loss Carryforward [Member]
Tax Credit Carryforward, Amount	318
Operating Loss Carryforwards, Valuation Allowance	$ 300
Earliest Tax Year [Member]
Operating Loss Carryforwards, Expiration Date	Jul. 29, 2019
Latest Tax Year [Member]
Operating Loss Carryforwards, Expiration Date	Jul. 31, 2037
State and Local Jurisdiction [Member]
Deferred Tax Assets, Tax Credit Carryforwards, Other	$ 23	$ 1
Deferred Tax Assets, Valuation Allowance	$ 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, 2029
Tax Cut and Jobs Act 2017 [Member]
Undistributed Earnings of Foreign Subsidiaries	$ 897