EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	4 Months Ended
	May 21, 2022	May 22, 2021
EARNINGS PER COMMON SHARE
Net earnings numerator (basic)	$ 657	$ 139
Net earnings numerator (diluted)	$ 657	$ 139
Average number of common shares used in basic calculation	722	752
Net earnings attributable to The Kroger Co. per basic common share	$ 0.91	$ 0.18
Dilutive effect of stock options (in shares)	11	8
Average number of common shares used in diluted calculation	733	760
Net earnings attributable to The Kroger Co. per diluted common share	$ 0.90	$ 0.18
Undistributed and distributed earnings to participating securities	$ 7	$ 1
Shares excluded from the earnings per share calculation due to anti-dilutive effect on earnings per share	1	8