Taxes on Earnings Taxes on Earnings (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 30, 2017	Jul. 31, 2016	Aug. 02, 2015
Operating Loss Carryforwards	$ 170
Operating Loss Carryforwards, Subject to Expiration	149
Operating Loss Carryforwards, Not Subject to Expiration	21
Operating Loss Carryforwards, Valuation Allowance	137
Valuation Allowance, Deferred Tax Asset, Change in Amount	2	$ (4)
Undistributed Earnings of Foreign Subsidiaries	820
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	43	42	$ 39
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	5	5
Income Tax Examination, Penalties and Interest Expense	4	3	$ 1
Income Tax Examination, Penalties and Interest Accrued	5	6
State and Local Jurisdiction [Member]
Deferred Tax Assets, Tax Credit Carryforwards, Other	1	$ 2
Non-U.S. [Member] | Capital Loss Carryforward [Member]
Tax Credit Carryforward, Amount	$ 323
Earliest Tax Year [Member]
Operating Loss Carryforwards, Expiration Date	Jul. 29, 2018
Earliest Tax Year [Member] | State and Local Jurisdiction [Member]
Tax Credit Carryforward, Expiration Date	Jul. 31, 2021	Jul. 29, 2018
Latest Tax Year [Member]
Operating Loss Carryforwards, Expiration Date	Jul. 31, 2037
Latest Tax Year [Member] | State and Local Jurisdiction [Member]
Tax Credit Carryforward, Expiration Date	Jul. 31, 2029	Jul. 28, 2025