ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - ITEMS RECLASSIFIED OUT OF AOCI (Details) - USD ($) $ in Millions	4 Months Ended
	May 24, 2025	May 25, 2024
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Tax expense	$ 235	$ 235
Net earnings attributable to The Kroger Co.	866	947
Total reclassifications, net of tax	1
Cash flow hedging activity
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Tax expense	(1)	(1)
Total reclassifications, net of tax	2	2
Pension and postretirement defined benefit plan
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Amortization of amounts included in net periodic pension cost	(1)	(2)
Total reclassifications, net of tax	(1)	(2)
Reclassification out of AOCI | Cash flow hedging activity
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Amortization of gains and losses on cash flow hedging activities	3	3
Tax expense	(1)	(1)
Net earnings attributable to The Kroger Co.	$ (2)	$ (2)