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EARNINGS PER COMMON SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Nov. 07, 2020
Nov. 09, 2019
Nov. 07, 2020
Nov. 09, 2019
EARNINGS PER COMMON SHARE        
Net earnings numerator (basic) $ 625 $ 260 $ 2,631 $ 1,317
Net earnings numerator (diluted) $ 625 $ 260 $ 2,631 $ 1,317
Average number of common shares used in basic calculation 772 802 777 800
Net earnings attributable to The Kroger Co. per basic common share $ 0.81 $ 0.32 $ 3.39 $ 1.65
Dilutive effect of stock options (in shares) 8 5 8 5
Average number of common shares used in diluted calculation 780 807 785 805
Net earnings attributable to The Kroger Co. per diluted common share $ 0.80 $ 0.32 $ 3.35 $ 1.64
Undistributed and distributed earnings to participating securities $ 6 $ 3 $ 31 $ 15
Shares excluded from the earnings per share calculation due to anti-dilutive effect on earnings per share 8 18 9 24