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Fair Value Measurements (Fair Value Measurement Of Assets And Liabilities) (Details) - Measured On Recurring Basis [Member] - USD ($)
$ in Millions
Aug. 02, 2020
Jul. 28, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets at fair value $ 15 $ 85
Total liabilities at fair value 103 105
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets at fair value 6 6
Total liabilities at fair value 97 98
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets at fair value 7 3
Total liabilities at fair value 6 7
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets at fair value 2 76
Foreign Exchange Forward Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets at fair value [1] 1 1
Derivatives liabilities at fair value [1] 2 4
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] 1 1
Derivatives liabilities at fair value [1] 2 4
Commodity Derivative Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets at fair value [2] 7 3
Derivatives liabilities at fair value [2] 9 6
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] 3 2
Derivatives liabilities at fair value [2] 5 3
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] 2 1
Derivatives liabilities at fair value [2] 4 3
Commodity Derivative Contracts [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets at fair value [2] 2 0
Deferred Compensation Derivative Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets at fair value [3] 4 1
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] 4 1
Deferred Compensation Investment [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments at fair value [4] 3 4
Deferred Compensation Investment [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments at fair value [4] 3 4
Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments at fair value [5] 0 76
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments at fair value [5] 0 76
Deferred Compensation Obligation [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation obligation [4] 92 95
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 [4] $ 92 $ 95
[1] Based on observable market transactions of spot currency rates and forward rates.
[2] Level 1 and 2 are based on quoted futures exchanges and on observable prices of futures and options transactions in the marketplace. Level 3 is based on unobservable inputs in which there is little or no market data, which requires management’s own assumptions within an internally developed model.
[3] Based on LIBOR and equity index swap rates.
[4] Based on the fair value of the participants’ investments.
[5] Primarily represented investments in equity securities that were not readily marketable and were accounted for under the fair value option. The investments were funded by Acre. Fair value was 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, were used in distributing fair value among various equity holders according to rights and preferences. We entered into an agreement to sell our interest in Acre on April 26, 2020, and completed the sale on May 8, 2020. See Note 16 for additional information.