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Fair Value Measurements (Tables)
 6 Months Ended
Jan. 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 January 26, 2020, and July 28, 2019, consistent with the fair value hierarchy:
 Fair Value
as of
January 26,
2020		Fair Value Measurements at
January 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)
$1  $—  $1  $—  $1  $—  $1  $—  
Commodity derivative contracts(2)
8  5  —  3  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)
73  —  —  73  76  —  —  76  
Total assets at fair value$86  $8  $2  $76  $85  $6  $3  $76  

 Fair Value
as of
January 26,
2020		Fair Value Measurements at
January 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)
$1  $—  $1  $—  $4  $—  $4  $—  
Commodity derivative contracts(2)
5  2  3  —  6  3  3  —  
Deferred compensation obligation(4)
107  107  —  —  95  95  —  —  
Total liabilities at fair value$113  $109  $4  $—  $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. See Note 14 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.
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 six-month periods ended January 26, 2020, and January 27, 2019:
Six Months Ended
 January 26, 2020January 27, 2019
Fair value at beginning of year$76  $77  
Gains (losses)—  (7) 
Fair value at end of quarter$76  $70