EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	4 Months Ended
	May 26, 2018	May 20, 2017
EARNINGS PER COMMON SHARE
Net earnings numerator	$ 2,005	$ 301
Average number of common shares used in basic calculation	839	914
Net earnings attributable to The Kroger Co. per basic common share	$ 2.39	$ 0.33
Dilutive effect of stock options (in shares)	7	11
Average number of common shares used in diluted calculation	846	925
Net earnings attributable to The Kroger Co. per diluted common share	$ 2.37	$ 0.32
Undistributed and distributed earnings to participating securities	$ 21	$ 2
Shares excluded from the earnings per share calculation due to anti-dilutive effect on earnings per share	17	9