Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	May. 01, 2016	Aug. 02, 2015
Derivatives, Fair Value [Line Items]
Entity Wide Revenue, Major Customer, Percentage Of Net Sales		20.00%
Margin Deposit Assets	$ 1	$ 12
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ 17
Cash Flow Hedge Ineffectiveness is Immaterial	The ineffective portion and amount excluded from effectiveness testing were not material.
Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Contracts Mature Within, Months	18 months
Commodity Derivative Contracts [Member]
Derivatives, Fair Value [Line Items]
Maximum Length of Contract Maturity	18 months
Deferred Compensation Derivative Contracts [Member]
Derivatives, Fair Value [Line Items]
Maximum Length of Contract Maturity	12 months
Derivatives Designated As Hedges [Member] | Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 71	53
Derivatives Designated As Hedges [Member] | Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	300	300
Derivatives Designated As Hedges [Member] | Commodity Derivative Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	0	0
Derivatives Not Designated As Hedges [Member] | Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	464	480
Derivatives Not Designated As Hedges [Member] | Commodity Derivative Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	93	95
Derivatives Not Designated As Hedges [Member] | Deferred Compensation Derivative Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 42	$ 49