Taxes on Earnings Taxes on Earnings (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Aug. 03, 2014	Jul. 28, 2013	Jul. 29, 2012
Operating Loss Carryforwards	$ 190
Operating Loss Carryforwards, Valuation Allowance	147
Valuation Allowance, Deferred Tax Asset, Change in Amount	3	6
Deferred Tax Assets, Tax Credit Carryforwards, Foreign		7
Undistributed Earnings of Foreign Subsidiaries	740
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	23	23	18
Unrecognized Tax Benefits, Possible Change	27
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	28
Unrecognized Tax Benefits Income Tax Penalties And Interest Due	2	2
Income Tax Examination, Penalties and Interest Accrued	3	2
State and Local Jurisdiction [Member]
Deferred Tax Assets, Tax Credit Carryforwards, Other	9	10
Non-U.S. [Member] | Capital Loss Carryforward [Member]
Tax Credit Carryforward, Amount	418
Minimum [Member]
Operating Loss Carryforwards, Expiration Date	Aug. 02, 2015
Effective Income Tax Rate At Statutory Tax Rate	15.00%
Minimum [Member] | State and Local Jurisdiction [Member]
Tax Credit Carryforward, Expiration Date	Jul. 29, 2018	Aug. 04, 2014
Maximum [Member]
Operating Loss Carryforwards, Expiration Date	Jul. 31, 2033
Effective Income Tax Rate At Statutory Tax Rate	35.00%
Maximum [Member] | State and Local Jurisdiction [Member]
Tax Credit Carryforward, Expiration Date	Jul. 28, 2024	Jul. 31, 2022
Maximum [Member] | Non-U.S. [Member]
Tax Credit Carryforward, Expiration Date		Jul. 30, 2023
Tax Loss Carryforwards Expiring 2015 to 2033 [Member]
Operating Loss Carryforwards	145
Tax Loss Carryfowards Indefinitely [Member]
Operating Loss Carryforwards	$ 45