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Financial Instruments (Schedule Of The Fair Value Of Derivative Instruments) (Details) - USD ($)
$ in Millions
May. 01, 2016
Aug. 02, 2015
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 38 $ 54
Liability Derivatives 49 20
Derivatives Designated As Hedges [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 0 3
Liability Derivatives 33 8
Derivatives Designated As Hedges [Member] | Foreign Exchange Forward Contracts [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 0 3
Derivatives Designated As Hedges [Member] | Foreign Exchange Forward Contracts [Member] | Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Liability Derivatives 3 0
Derivatives Designated As Hedges [Member] | Interest Rate Contract [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Liability Derivatives 30 8
Derivatives Not Designated As Hedges [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 38 51
Liability Derivatives 16 12
Derivatives Not Designated As Hedges [Member] | Commodity Derivative Contracts [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 6 1
Derivatives Not Designated As Hedges [Member] | Commodity Derivative Contracts [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 1 0
Derivatives Not Designated As Hedges [Member] | Commodity Derivative Contracts [Member] | Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Liability Derivatives 2 10
Derivatives Not Designated As Hedges [Member] | Currency Swap [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 30 18
Derivatives Not Designated As Hedges [Member] | Currency Swap [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 0 22
Derivatives Not Designated As Hedges [Member] | Deferred Compensation Derivative Contracts [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 0 1
Derivatives Not Designated As Hedges [Member] | Deferred Compensation Derivative Contracts [Member] | Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Liability Derivatives 1 0
Derivatives Not Designated As Hedges [Member] | Foreign Exchange Forward Contracts [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 1 9
Derivatives Not Designated As Hedges [Member] | Foreign Exchange Forward Contracts [Member] | Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Liability Derivatives $ 13 $ 2