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Fair Value Measurements (Fair Value Measurement Of Assets And Liabilities) (Details) - USD ($)
$ in Millions
Jan. 29, 2017
Jul. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets at fair value $ 52 $ 38
Total liabilities at fair value 151 179
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets at fair value 4 2
Total liabilities at fair value 133 123
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets at fair value 5 11
Total liabilities at fair value 18 56
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets at fair value 43 25
Measured On Recurring Basis [Member] | Foreign Exchange Forward Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets at fair value [1] 0 1
Derivative liabilities at fair value [1] 3 11
Measured On Recurring Basis [Member] | Foreign Exchange Forward Contracts [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets at fair value [1] 0 1
Derivative liabilities at fair value [1] 3 11
Measured On Recurring Basis [Member] | Commodity Derivative Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets at fair value [2] 5 3
Derivative liabilities at fair value [2] 3 4
Measured On Recurring Basis [Member] | Commodity Derivative Contracts [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets at fair value [2] 4 2
Derivative liabilities at fair value [2] 3 4
Measured On Recurring Basis [Member] | Commodity Derivative Contracts [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets at fair value [2] 1 1
Measured On Recurring Basis [Member] | Deferred Compensation Derivative Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets at fair value [3] 1 1
Derivative liabilities at fair value [3] 0 1
Measured On Recurring Basis [Member] | Deferred Compensation Derivative Contracts [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets at fair value [3] 1 1
Derivative liabilities at fair value [3] 0 1
Measured On Recurring Basis [Member] | Investments Fair Value Accounting [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments at fair value [4] 46 33
Measured On Recurring Basis [Member] | Investments Fair Value Accounting [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments at fair value [4] 3 8
Measured On Recurring Basis [Member] | Investments Fair Value Accounting [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments at fair value [4] 43 25
Measured On Recurring Basis [Member] | Interest Rate Contract [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities at fair value [5] 15 44
Measured On Recurring Basis [Member] | Interest Rate Contract [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities at fair value [5] 15 44
Measured On Recurring Basis [Member] | Deferred Compensation Obligation [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation obligation [6] 130 119
Measured On Recurring Basis [Member] | Deferred Compensation Obligation [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation obligation [6] $ 130 $ 119
[1] Based on observable market transactions of spot currency rates and forward rates.
[2] Based on quoted futures exchanges and on observable prices of futures and options transactions in the marketplace.
[3] Based on LIBOR and equity index swap rates.
[4] Primarily represents investments in equity securities that are not readily marketable and are accounted for under the fair value option. The investments were funded by Acre. See Note 10 for additional information. Fair value is based on analyzing recent transactions and transactions of comparable companies, and the discounted cash flow method. In addition, allocation methods, including the option pricing method, are used in distributing fair value among various equity holders according to rights and preferences. Changes in the fair value of investments were not material through January 29, 2017.
[5] Based on LIBOR swap rates.
[6] Based on the fair value of the participants’ investments.