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EARNINGS PER COMMON SHARE (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 4 Months Ended 12 Months Ended
Jan. 31, 2015
Nov. 08, 2014
Aug. 16, 2014
Feb. 01, 2014
Nov. 09, 2013
Aug. 17, 2013
May 24, 2014
May 25, 2013
Jan. 31, 2015
Feb. 01, 2014
Feb. 02, 2013
EARNINGS PER COMMON SHARE                      
Net earnings attributable to The Kroger Co. per basic common share                 $ 1,711kr_NetIncomeLossAttributableToParentNetOfIncomeAllocatedToParticipatingSecuritiesBasic $ 1,507kr_NetIncomeLossAttributableToParentNetOfIncomeAllocatedToParticipatingSecuritiesBasic $ 1,485kr_NetIncomeLossAttributableToParentNetOfIncomeAllocatedToParticipatingSecuritiesBasic
Average number of common shares used in basic calculation 486us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 486us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 485us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 511us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 515us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 515us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 501us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 514us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 490us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 514us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 533us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Net earnings attributable to The Kroger Co. per basic common share $ 1.06us-gaap_EarningsPerShareBasic $ 0.74us-gaap_EarningsPerShareBasic $ 0.71us-gaap_EarningsPerShareBasic $ 0.82us-gaap_EarningsPerShareBasic $ 0.58us-gaap_EarningsPerShareBasic $ 0.61us-gaap_EarningsPerShareBasic $ 0.99us-gaap_EarningsPerShareBasic $ 0.93us-gaap_EarningsPerShareBasic $ 3.49us-gaap_EarningsPerShareBasic $ 2.93us-gaap_EarningsPerShareBasic $ 2.78us-gaap_EarningsPerShareBasic
Dilutive effect of stock options (in shares)                 7us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 6us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 4us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Net earnings attributable to The Kroger Co. per diluted common share                 1,711kr_NetIncomeLossAttributableToParentNetOfIncomeAllocatedToParticipatingSecuritiesDiluted 1,507kr_NetIncomeLossAttributableToParentNetOfIncomeAllocatedToParticipatingSecuritiesDiluted 1,485kr_NetIncomeLossAttributableToParentNetOfIncomeAllocatedToParticipatingSecuritiesDiluted
Average number of common shares used in diluted calculation 493us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 492us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 491us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 517us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 521us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 521us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 507us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 520us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 497us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 520us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 537us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net earnings attributable to The Kroger Co. per diluted common share $ 1.04us-gaap_EarningsPerShareDiluted $ 0.73us-gaap_EarningsPerShareDiluted $ 0.70us-gaap_EarningsPerShareDiluted $ 0.81us-gaap_EarningsPerShareDiluted $ 0.57us-gaap_EarningsPerShareDiluted $ 0.60us-gaap_EarningsPerShareDiluted $ 0.98us-gaap_EarningsPerShareDiluted $ 0.92us-gaap_EarningsPerShareDiluted $ 3.44us-gaap_EarningsPerShareDiluted $ 2.90us-gaap_EarningsPerShareDiluted $ 2.77us-gaap_EarningsPerShareDiluted
Undistributed and distributed earnings to participating securities                 $ 17kr_UndistributedAndDistributedEarningsToParticipatingSecurities $ 12kr_UndistributedAndDistributedEarningsToParticipatingSecurities $ 12kr_UndistributedAndDistributedEarningsToParticipatingSecurities
Shares excluded from the earnings per share calculation due to anti-dilutive effect on earnings per share                 2.3us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 2.3us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 12.2us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount