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Fair Value Measurements (Tables)
 6 Months Ended
Jan. 31, 2021
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 31, 2021, and August 2, 2020, consistent with the fair value hierarchy:
 Fair Value
as of
January 31,
2021		Fair Value Measurements at
January 31, 2021 Using
Fair Value Hierarchy		Fair Value
as of
August 2,
2020		Fair Value Measurements at
August 2, 2020 Using
Fair Value Hierarchy
 Level 1Level 2Level 3Level 1Level 2Level 3
Assets
Foreign exchange forward contracts(1)
$— $— $— $— $1 $— $1 $— 
Commodity derivative contracts(2)
17 9 8 — 7 3 2 2 
Deferred compensation derivative contracts(3)
3 — 3 — 4 — 4 — 
Deferred compensation investments(4)
3 3 — — 3 3 — — 
Total assets at fair value$23 $12 $11 $— $15 $6 $7 $2 

 Fair Value
as of
January 31,
2021		Fair Value Measurements at
January 31, 2021 Using
Fair Value Hierarchy		Fair Value
as of
August 2,
2020		Fair Value Measurements at
August 2, 2020 Using
Fair Value Hierarchy
 Level 1Level 2Level 3Level 1Level 2Level 3
Liabilities
Foreign exchange forward contracts(1)
$4 $— $4 $— $2 $— $2 $— 
Commodity derivative contracts(2)
2 — 1 1 9 5 4 — 
Deferred compensation obligation(4)
108 108 — — 92 92 — — 
Total liabilities at fair value$114 $108 $5 $1 $103 $97 $6 $— 
___________________________________ 
(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.
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 and liabilities for the six-month periods ended January 31, 2021, and January 26, 2020:
Six Months Ended
 January 31,
2021
January 26, 2020(1)
Fair value at beginning of year$2 $76 
Gains (losses)— — 
Settlements(3)— 
Fair value at end of quarter$(1)$76 
___________________________________
(1)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 Venture Partners, L.P. (Acre), a limited partnership in which we were the sole limited partner. 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.