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Financial Instruments (Schedule Of The Fair Value Of Derivative Instruments) (Details) - USD ($)
$ in Millions
Jan. 28, 2018
Jul. 30, 2017
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset $ 20 $ 10
Derivative Liability, Fair Value, Gross Liability 8 44
Derivatives Designated As Hedges [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 11 3
Derivative Liability, Fair Value, Gross Liability 0 23
Derivatives Designated As Hedges [Member] | Foreign Exchange Forward Contracts [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 1 3
Derivatives Designated As Hedges [Member] | Foreign Exchange Forward Contracts [Member] | Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 0 1
Derivatives Designated As Hedges [Member] | Interest Rate Contract [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 10 0
Derivatives Designated As Hedges [Member] | Interest Rate Contract [Member] | Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 0 22
Derivatives Not Designated As Hedges [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 9 7
Derivative Liability, Fair Value, Gross Liability 8 21
Derivatives Not Designated As Hedges [Member] | Foreign Exchange Forward Contracts [Member] | Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 6 19
Derivatives Not Designated As Hedges [Member] | Foreign Exchange Forward Contracts [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 0 1
Derivatives Not Designated As Hedges [Member] | Commodity Derivative Contracts [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 5 5
Derivatives Not Designated As Hedges [Member] | Commodity Derivative Contracts [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 1
Derivatives Not Designated As Hedges [Member] | Commodity Derivative Contracts [Member] | Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 2 1
Derivatives Not Designated As Hedges [Member] | Deferred Compensation Derivative Contracts [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 3 1
Derivatives Not Designated As Hedges [Member] | Treasury Lock [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset $ 1 $ 0