EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended						4 Months Ended		12 Months Ended
	Jan. 30, 2021	Nov. 07, 2020	Aug. 15, 2020	Feb. 01, 2020	Nov. 09, 2019	Aug. 17, 2019	May 23, 2020	May 25, 2019	Jan. 30, 2021	Feb. 01, 2020	Feb. 02, 2019
EARNINGS PER COMMON SHARE
Net earnings numerator (basic)									$ 2,556	$ 1,640	$ 3,076
Net earnings numerator (diluted)									$ 2,556	$ 1,640	$ 3,076
Average number of common shares used in basic calculation	761.0	772.0	777.0	797.0	802.0	800.0	780.0	798.0	773.0	799.0	810.0
Net earnings attributable to The Kroger Co. per basic common share	$ (0.10)	$ 0.81	$ 1.04	$ 0.40	$ 0.32	$ 0.37	$ 1.53	$ 0.96	$ 3.31	$ 2.05	$ 3.80
Dilutive effect of stock options (in shares)									8.0	6.0	8.0
Average number of common shares used in diluted calculation	761.0	780.0	786.0	804.0	807.0	805.0	788.0	805.0	781.0	805.0	818.0
Net earnings attributable to The Kroger Co. per diluted common share	$ (0.10)	$ 0.80	$ 1.03	$ 0.40	$ 0.32	$ 0.37	$ 1.52	$ 0.95	$ 3.27	$ 2.04	$ 3.76
Undistributed and distributed earnings to participating securities									$ 29	$ 19	$ 34
Shares excluded from the earnings per share calculation due to anti-dilutive effect on earnings per share									9.1	18.4	10.1