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EARNINGS PER COMMON SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 4 Months Ended 12 Months Ended
Jan. 28, 2017
Nov. 05, 2016
Aug. 13, 2016
Jan. 30, 2016
Nov. 07, 2015
Aug. 15, 2015
May 21, 2016
May 23, 2015
Jan. 28, 2017
Jan. 30, 2016
Jan. 31, 2015
EARNINGS PER COMMON SHARE                      
Net earnings attributable to The Kroger Co. per basic common share                 $ 1,959 $ 2,021 $ 1,711
Average number of common shares used in basic calculation 929.0 940.0 943.0 966.0 965.0 963.0 954.0 969.0 942.0 966.0 981.0
Net earnings attributable to The Kroger Co. per basic common share $ 0.54 $ 0.41 $ 0.40 $ 0.57 $ 0.44 $ 0.44 $ 0.72 $ 0.63 $ 2.08 $ 2.09 $ 1.74
Dilutive effect of stock options (in shares)                 16.0 14.0 12.0
Net earnings attributable to The Kroger Co. per diluted common share                 $ 1,959 $ 2,021 $ 1,711
Average number of common shares used in diluted calculation 943.0 953.0 959.0 980.0 979.0 977.0 966.0 983.0 958.0 980.0 993.0
Net earnings attributable to The Kroger Co. per diluted common share $ 0.53 $ 0.41 $ 0.40 $ 0.57 $ 0.43 $ 0.44 $ 0.71 $ 0.62 $ 2.05 $ 2.06 $ 1.72
Undistributed and distributed earnings to participating securities                 $ 16 $ 18 $ 17
Shares excluded from the earnings per share calculation due to anti-dilutive effect on earnings per share                 7.1 1.9 4.6