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FAIR VALUE MEASUREMENTS OF FINANCIAL INSTRUMENTS - Recurring Fair Value Measurements (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Jul. 31, 2021	Aug. 01, 2020
Prepaid expenses and other current assets | Level 1 | Fuel derivatives | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives designated as hedging instruments	$ 0
Prepaid expenses and other current assets | Level 2 | Fuel derivatives | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives designated as hedging instruments	1
Prepaid expenses and other current assets | Level 3 | Fuel derivatives | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives designated as hedging instruments	0
Other long-term assets | Level 1
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Mutual funds	2	$ 2
Other long-term assets | Level 2
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Mutual funds	0	0
Other long-term assets | Level 3
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Mutual funds	0	0
Accrued expenses and other current liabilities | Level 1 | Foreign currency derivatives | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Liabilities	0
Accrued expenses and other current liabilities | Level 1 | Interest rate swaps | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Liabilities	0	0
Accrued expenses and other current liabilities | Level 2 | Foreign currency derivatives | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Liabilities	1
Accrued expenses and other current liabilities | Level 2 | Interest rate swaps | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Liabilities	33	47
Accrued expenses and other current liabilities | Level 3 | Foreign currency derivatives | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Liabilities	0
Accrued expenses and other current liabilities | Level 3 | Interest rate swaps | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Liabilities	0	0
Other long-term liabilities | Level 1 | Interest rate swaps | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Liabilities	0	0
Other long-term liabilities | Level 2 | Interest rate swaps | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Liabilities	42	92
Other long-term liabilities | Level 3 | Interest rate swaps | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Liabilities	$ 0	$ 0

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

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-Publisher FASB
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+ References

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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