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DEBT OBLIGATIONS (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 12 Months Ended
Jun. 30, 2014
Jan. 31, 2015
Feb. 01, 2014
Debt      
Total debt   $ 11,085us-gaap_LongTermDebt $ 10,780us-gaap_LongTermDebt
Less current portion   (1,844)us-gaap_LongTermDebtCurrent (1,616)us-gaap_LongTermDebtCurrent
Total long-term debt   9,241us-gaap_LongTermDebtNoncurrent 9,164us-gaap_LongTermDebtNoncurrent
Unsecured revolving credit facility      
Debt      
Maximum borrowing capacity 2,750us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember		    
Maximum borrowing capacity prior to amended and restated credit agreement 2,000kr_LineOfCreditFacilityMaximumBorrowingCapacityPriorToAmendedAndRestatedCreditAgreement
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember		    
Additional borrowing capacity 750kr_LineOfCreditFacilityAdditionalBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember		    
Unsecured revolving credit facility | Maximum      
Debt      
Leverage ratio (as a percent) 3.50kr_DebtInstrumentCovenantLeverageRatio
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Unsecured revolving credit facility | Minimum      
Debt      
Fixed charge coverage ratio (as a percent) 1.70kr_DebtInstrumentCovenantFixedChargeCoverageRatio
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Unsecured revolving credit facility | LIBOR plus a market rate spread, based on the Company's Leverage Ratio      
Debt      
Debt instrument variable basis rate LIBOR plus a market rate spread, based on the Company's Leverage Ratio    
Unsecured revolving credit facility | Federal Funds Rate      
Debt      
Debt instrument variable basis rate Federal Funds Rate    
Interest rate margin (as a percent) 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
/ us-gaap_VariableRateAxis
= kr_DebtInstrumentVariableRateBaseFederalFundsMember		    
Unsecured revolving credit facility | Bank of America prime rate      
Debt      
Debt instrument variable basis rate Bank of America prime rate    
Unsecured revolving credit facility | One-month LIBOR plus 1.0 percent plus a market rate spread based on the Company's Leverage Ratio      
Debt      
Debt instrument variable basis rate one-month LIBOR plus 1.0%, plus a market rate spread based on the Company's Leverage Ratio    
Interest rate margin (as a percent) 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
/ us-gaap_VariableRateAxis
= kr_DebtInstrumentVariableRateBaseOneMonthLIBORMember		    
Commercial paper due through February 2015      
Debt      
Total debt   1,275us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_CommercialPaperMember		 1,250us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_CommercialPaperMember
Interest rate, minimum range (as a percent)   0.27%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_CommercialPaperMember		 0.27%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_CommercialPaperMember
Interest rate, maximum range (as a percent)   0.37%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_CommercialPaperMember		 0.37%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_CommercialPaperMember
Senior notes due through 2043      
Debt      
Total debt   9,283us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember		 9,083us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
Interest rate, minimum range (as a percent)   0.76%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember		 0.76%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
Interest rate, maximum range (as a percent)   8.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember		 8.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
Senior notes 2.95% due 2021      
Debt      
New issue of senior notes   500us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= kr_SeniorNotesDue2021At2.95PercentMember		  
Interest rate (as a percent)   2.95%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= kr_SeniorNotesDue2021At2.95PercentMember		  
Senior notes 4.95%      
Debt      
Interest rate (as a percent)   4.95%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= kr_SeniorNotesAt4.95PercentMember		  
Repayment of debt   300us-gaap_RepaymentsOfDebt
/ us-gaap_LongtermDebtTypeAxis
= kr_SeniorNotesAt4.95PercentMember		  
Senior notes 3.85% due 2023      
Debt      
New issue of senior notes     600us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= kr_SeniorNotesDue2023At3.85PercentMember
Interest rate (as a percent)     3.85%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= kr_SeniorNotesDue2023At3.85PercentMember
Senior notes 5.15% due 2043      
Debt      
New issue of senior notes     400us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= kr_SeniorNotesDue2043At5.15PercentMember
Interest rate (as a percent)     5.15%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= kr_SeniorNotesDue2043At5.15PercentMember
Senior notes due in 2016 | Three-month LIBOR      
Debt      
Debt instrument variable basis rate     3-month London Inter-Bank Offering Rate
Interest rate margin (as a percent)     0.53%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= kr_SeniorNotesDue2016Member
/ us-gaap_VariableRateAxis
= kr_ThreeMonthLondonInterbankOfferedRateLIBORMember
New issue of senior notes     500us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= kr_SeniorNotesDue2016Member
/ us-gaap_VariableRateAxis
= kr_ThreeMonthLondonInterbankOfferedRateLIBORMember
Senior notes 1.20% due 2016      
Debt      
New issue of senior notes     300us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= kr_SeniorNotesDue2016At1.20PercentMember
Interest rate (as a percent)     1.20%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= kr_SeniorNotesDue2016At1.20PercentMember
Senior notes 2.30% due 2019      
Debt      
New issue of senior notes     500us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= kr_SeniorNotesDue2019At2.30PercentMember
Interest rate (as a percent)     2.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= kr_SeniorNotesDue2019At2.30PercentMember
Senior notes 3.30% due 2021      
Debt      
New issue of senior notes     700us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= kr_SeniorNotesDue2021At3.30PercentMember
Interest rate (as a percent)     3.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= kr_SeniorNotesDue2021At3.30PercentMember
Senior notes 4.00% due 2024      
Debt      
New issue of senior notes     500us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= kr_SeniorNotesDue2024At4.00PercentMember
Interest rate (as a percent)     4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= kr_SeniorNotesDue2024At4.00PercentMember
Senior notes 5.00%      
Debt      
Interest rate (as a percent)     5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= kr_SeniorNotesAt5.00PercentMember
Repayment of debt     400us-gaap_RepaymentsOfDebt
/ us-gaap_LongtermDebtTypeAxis
= kr_SeniorNotesAt5.00PercentMember
Senior notes 7.50%      
Debt      
Interest rate (as a percent)     7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= kr_SeniorNotesAt7.50PercentMember
Repayment of debt     600us-gaap_RepaymentsOfDebt
/ us-gaap_LongtermDebtTypeAxis
= kr_SeniorNotesAt7.50PercentMember
Mortgages due in varying amounts through 2027      
Debt      
Total debt   73us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		 64us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Interest rate, minimum range (as a percent)   5.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Interest rate, maximum range (as a percent)   12.75%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		 12.75%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Other      
Debt      
Total debt   $ 454us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= kr_OtherDebtMember		 $ 383us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= kr_OtherDebtMember