Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Oct. 27, 2013	Jul. 28, 2013
Derivatives, Fair Value [Line Items]
Entity Wide Revenue, Major Customer, Percentage Of Net Sales		19.00%
Margin Deposit Assets	$ 6	$ 7
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	(1)
Cash Flow Hedge Ineffectiveness is Immaterial	The ineffective portion and amount excluded from effectiveness testing were not material.
Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Contracts Mature Within, Months	18 months
Currency Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative, Lower Remaining Maturity Range	1 month
Derivative, Higher Remaining Maturity Range	33 months
Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	47	129
Commodity Derivative Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	100	105
Maximum Length of Contract Maturity	18 months
Deferred Compensation Derivative Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	49	50
Maximum Length of Contract Maturity	12 months
Derivatives Not Designated As Hedges [Member] | Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	951	895
Fair Value Hedging [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		200
Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	250	250
Cash Flow Hedging [Member] | Commodity Derivative Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 0	$ 0