SIGNIFICANT ACCOUNTING POLICIES - Changes in Insurance Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
Jul. 31, 2021	Aug. 01, 2020	Aug. 03, 2019
Self Insurance Reserve Rollforward Abstract [Roll Forward]
Beginning balance	$ 101	$ 89	$ 25
Assumed liabilities from the Supervalu acquisition	0	0	55
Expense	48	44	43
Claim payments	(48)	(36)	(33)
Reclassifications	2	4	(1)
Ending balance	$ 103	$ 101	$ 89

Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_SelfInsuranceReserve
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant