FAIR VALUE MEASUREMENTS OF FINANCIAL INSTRUMENTS - Recurring Fair Value Measurements (Details) - Fair value, measurements, recurring - USD ($) $ in Millions	Jan. 29, 2022	Jul. 31, 2021
Level 1 | Other long-term assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Mutual funds	$ 1	$ 2
Level 1 | Fuel derivatives | Prepaid expenses and other current assets | Designated as hedging instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Swap assets	0	0
Level 1 | Foreign currency derivatives | Prepaid expenses and other current assets | Designated as hedging instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Swap assets	0
Level 1 | Foreign currency derivatives | Accrued expenses and other current liabilities | Designated as hedging instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Swap liabilities		0
Level 1 | Interest rate swaps | Accrued expenses and other current liabilities | Designated as hedging instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Swap liabilities	0	0
Level 1 | Interest rate swaps | Other long-term liabilities | Designated as hedging instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Swap liabilities	0	0
Level 2 | Other long-term assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Mutual funds	0	0
Level 2 | Fuel derivatives | Prepaid expenses and other current assets | Designated as hedging instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Swap assets	2	1
Level 2 | Foreign currency derivatives | Prepaid expenses and other current assets | Designated as hedging instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Swap assets	1
Level 2 | Foreign currency derivatives | Accrued expenses and other current liabilities | Designated as hedging instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Swap liabilities		1
Level 2 | Interest rate swaps | Accrued expenses and other current liabilities | Designated as hedging instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Swap liabilities	24	33
Level 2 | Interest rate swaps | Other long-term liabilities | Designated as hedging instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Swap liabilities	15	42
Level 3 | Other long-term assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Mutual funds	0	0
Level 3 | Fuel derivatives | Prepaid expenses and other current assets | Designated as hedging instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Swap assets	0	0
Level 3 | Foreign currency derivatives | Prepaid expenses and other current assets | Designated as hedging instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Swap assets	0
Level 3 | Foreign currency derivatives | Accrued expenses and other current liabilities | Designated as hedging instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Swap liabilities		0
Level 3 | Interest rate swaps | Accrued expenses and other current liabilities | Designated as hedging instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Swap liabilities	0	0
Level 3 | Interest rate swaps | Other long-term liabilities | Designated as hedging instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Swap liabilities	$ 0	$ 0