BENEFIT PLANS - Defined Benefit Pension Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 29, 2023	Jul. 30, 2022	Jul. 31, 2021
Changes in Plan Assets
Fair value of plan assets at beginning of year	$ 1,716
Fair value of plan assets at end of year	1,559	$ 1,716
Pension Benefits
Changes in Benefit Obligation
Benefit obligation at beginning of year	1,706	2,093
Actuarial gain	(121)	(322)
Benefits paid	(103)	(103)
Interest cost	63	38	$ 37
Settlements paid	0	0
Benefit obligation at end of year	1,545	1,706	2,093
Changes in Plan Assets
Fair value of plan assets at beginning of year	1,716	2,118
Actual return on plan assets	(55)	(300)
Benefits paid	(103)	(103)
Settlements paid	0	0
Employer contributions	1	1
Fair value of plan assets at end of year	1,559	1,716	2,118
Funded (unfunded) status at end of year	14	10
Pension Benefits | SUPERVALU INC. Retirement Plan
Changes in Benefit Obligation
Benefit obligation at beginning of year	1,698
Benefit obligation at end of year	1,539	1,698
Changes in Plan Assets
Fair value of plan assets at beginning of year	1,716
Fair value of plan assets at end of year	1,559	1,716
Funded (unfunded) status at end of year	20	18
Pension Benefits | Other Pension Plan
Changes in Benefit Obligation
Benefit obligation at beginning of year	8
Benefit obligation at end of year	6	8
Changes in Plan Assets
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
Funded (unfunded) status at end of year	(6)	(8)
Other Postretirement Benefits
Changes in Benefit Obligation
Benefit obligation at beginning of year	12	18
Actuarial gain	(1)	(4)
Benefits paid	0	(1)
Interest cost	0	0	0
Settlements paid	0	(1)
Benefit obligation at end of year	11	12	18
Changes in Plan Assets
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Benefits paid	(1)	(1)
Settlements paid	0	(1)
Employer contributions	1	2
Fair value of plan assets at end of year	0	0	$ 0
Funded (unfunded) status at end of year	$ (11)	$ (12)