EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	4 Months Ended
	May 22, 2021	May 23, 2020
EARNINGS PER COMMON SHARE
Net earnings numerator (basic)	$ 139	$ 1,197
Net earnings numerator (diluted)	$ 139	$ 1,197
Average number of common shares used in basic calculation	752	780
Net earnings attributable to The Kroger Co. per basic common share	$ 0.18	$ 1.53
Dilutive effect of stock options (in shares)	8	8
Average number of common shares used in diluted calculation	760	788
Net earnings attributable to The Kroger Co. per diluted common share	$ 0.18	$ 1.52
Undistributed and distributed earnings to participating securities	$ 1	$ 15
Shares excluded from the earnings per share calculation due to anti-dilutive effect on earnings per share	8	11