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Fair Value Measurements (Tables)
 9 Months Ended
Apr. 26, 2020
Fair Value Disclosures [Abstract]  
Fair Value, Assets And Liabilities Measured on Recurring Basis [Table Text Block]
The following table presents our financial assets and liabilities that are measured at fair value on a recurring basis as of April 26, 2020, and July 28, 2019, consistent with the fair value hierarchy:
 Fair Value
as of
April 26,
2020		Fair Value Measurements at
April 26, 2020 Using
Fair Value Hierarchy		Fair Value
as of
July 28,
2019		Fair Value Measurements at
July 28, 2019 Using
Fair Value Hierarchy
 Level 1Level 2Level 3Level 1Level 2Level 3
Assets
Foreign exchange forward contracts(1)
$7  $—  $7  $—  $1  $—  $1  $—  
Commodity derivative contracts(2)
3  1  1  1  3  2  1  —  
Deferred compensation derivative contracts(3)
1  —  1  —  1  —  1  —  
Deferred compensation investments(4)
3  3  —  —  4  4  —  —  
Fair value option investments(5)
29  —  —  29  76  —  —  76  
Total assets at fair value$43  $4  $9  $30  $85  $6  $3  $76  

 Fair Value
as of
April 26,
2020		Fair Value Measurements at
April 26, 2020 Using
Fair Value Hierarchy		Fair Value
as of
July 28,
2019		Fair Value Measurements at
July 28, 2019 Using
Fair Value Hierarchy
 Level 1Level 2Level 3Level 1Level 2Level 3
Liabilities
Foreign exchange forward contracts(1)
$—  $—  $—  $—  $4  $—  $4  $—  
Commodity derivative contracts(2)
26  16  10  —  6  3  3  —  
Deferred compensation obligation(4)
86  86  —  —  95  95  —  —  
Total liabilities at fair value$112  $102  $10  $—  $105  $98  $7  $—  
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(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 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. Prior to April 26, 2020, 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. As a result of the pending sale, we adjusted the fair value based on the proceeds and reclassified the assets to assets held for sale on the Consolidated Balance Sheet. See Note 14 for additional information.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
The following table summarizes the changes in fair value of Level 3 assets for the nine-month periods ended April 26, 2020, and April 28, 2019:
Nine Months Ended
 April 26,
2020		April 28,
2019
Fair value at beginning of year$76  $77  
Gains (losses)(46) 1  
Purchases1  —  
Settlements(1) —  
Fair value at end of quarter$30  $78