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MULTI-EMPLOYER PENSION PLANS (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 3 Months Ended 4 Months Ended
Jan. 31, 2015
Feb. 01, 2014
Feb. 02, 2013
Jan. 31, 2015
Feb. 02, 2013
May 24, 2014
MULTI-EMPLOYER PLANS            
Employer contribution to multi-employer plans $ 1,200us-gaap_MultiemployerPlanPeriodContributions $ 1,100us-gaap_MultiemployerPlanPeriodContributions $ 1,100us-gaap_MultiemployerPlanPeriodContributions      
Red zone | Maximum            
MULTI-EMPLOYER PLANS            
Percentage of funded status 65.00%kr_MultiemployerPlansPercentageOfFundedStatus
/ kr_MultiemployerPlanPensionProtectionActZoneAxis
= kr_PensionProtectionsRedZoneMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		          
Yellow zone | Maximum            
MULTI-EMPLOYER PLANS            
Percentage of funded status 80.00%kr_MultiemployerPlansPercentageOfFundedStatus
/ kr_MultiemployerPlanPensionProtectionActZoneAxis
= kr_PensionProtectionsYellowZoneMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		          
Green zone | Minimum            
MULTI-EMPLOYER PLANS            
Percentage of funded status 80.00%kr_MultiemployerPlansPercentageOfFundedStatus
/ kr_MultiemployerPlanPensionProtectionActZoneAxis
= kr_PensionProtectionsGreenZoneMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		          
Multi-employer Pension Plan            
MULTI-EMPLOYER PLANS            
Employer contribution to multi-employer plans 297us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 228us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 492us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		      
Multi-employer Pension Plan | SO CA UFCW Unions & Food Employers Joint Pension Trust Fund            
MULTI-EMPLOYER PLANS            
Employer contribution to multi-employer plans 48us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_SOCAUFCWUnionsAndFoodEmployersJointPensionTrustFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 45us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_SOCAUFCWUnionsAndFoodEmployersJointPensionTrustFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 43us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_SOCAUFCWUnionsAndFoodEmployersJointPensionTrustFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		      
Minimum percentage of total contributions received by pension fund 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_SOCAUFCWUnionsAndFoodEmployersJointPensionTrustFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_SOCAUFCWUnionsAndFoodEmployersJointPensionTrustFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_SOCAUFCWUnionsAndFoodEmployersJointPensionTrustFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_SOCAUFCWUnionsAndFoodEmployersJointPensionTrustFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_SOCAUFCWUnionsAndFoodEmployersJointPensionTrustFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		  
Most significant collective bargaining agreements count 2kr_MultiemployerPlansMostSignificantCollectiveBargainingArrangementNumber
/ us-gaap_MultiemployerPlanNameAxis
= kr_SOCAUFCWUnionsAndFoodEmployersJointPensionTrustFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		          
Multi-employer Pension Plan | Desert States Employers & UFCW Unions Pension Plan            
MULTI-EMPLOYER PLANS            
Employer contribution to multi-employer plans 21us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_DesertStatesEmployersAndUFCWUnionsPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 23us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_DesertStatesEmployersAndUFCWUnionsPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 22us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_DesertStatesEmployersAndUFCWUnionsPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		      
Minimum percentage of total contributions received by pension fund 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_DesertStatesEmployersAndUFCWUnionsPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_DesertStatesEmployersAndUFCWUnionsPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_DesertStatesEmployersAndUFCWUnionsPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_DesertStatesEmployersAndUFCWUnionsPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_DesertStatesEmployersAndUFCWUnionsPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		  
Most significant collective bargaining agreements count 1kr_MultiemployerPlansMostSignificantCollectiveBargainingArrangementNumber
/ us-gaap_MultiemployerPlanNameAxis
= kr_DesertStatesEmployersAndUFCWUnionsPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		          
Multi-employer Pension Plan | Sound Retirement Trust (formerly Retail Clerks Pension Plan)            
MULTI-EMPLOYER PLANS            
Employer contribution to multi-employer plans 15us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_SoundRetirementTrustMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 13us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_SoundRetirementTrustMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 12us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_SoundRetirementTrustMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		      
Minimum percentage of total contributions received by pension fund 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_SoundRetirementTrustMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_SoundRetirementTrustMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_SoundRetirementTrustMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_SoundRetirementTrustMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_SoundRetirementTrustMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		  
Most significant collective bargaining agreements count 2kr_MultiemployerPlansMostSignificantCollectiveBargainingArrangementNumber
/ us-gaap_MultiemployerPlanNameAxis
= kr_SoundRetirementTrustMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		          
Multi-employer Pension Plan | Rocky Mountain UFCW Unions and Employers Pension Plan            
MULTI-EMPLOYER PLANS            
Employer contribution to multi-employer plans 17us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_RockyMountainUFCWUnionsAndEmployersPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 17us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_RockyMountainUFCWUnionsAndEmployersPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 17us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_RockyMountainUFCWUnionsAndEmployersPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		      
Minimum percentage of total contributions received by pension fund 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_RockyMountainUFCWUnionsAndEmployersPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_RockyMountainUFCWUnionsAndEmployersPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_RockyMountainUFCWUnionsAndEmployersPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_RockyMountainUFCWUnionsAndEmployersPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_RockyMountainUFCWUnionsAndEmployersPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		  
Most significant collective bargaining agreements count 1kr_MultiemployerPlansMostSignificantCollectiveBargainingArrangementNumber
/ us-gaap_MultiemployerPlanNameAxis
= kr_RockyMountainUFCWUnionsAndEmployersPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		          
Multi-employer Pension Plan | Oregon Retail Employees Pension Plan            
MULTI-EMPLOYER PLANS            
Employer contribution to multi-employer plans 7us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_OregonRetailEmployeesPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 7us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_OregonRetailEmployeesPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 7us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_OregonRetailEmployeesPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		      
Minimum percentage of total contributions received by pension fund 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_OregonRetailEmployeesPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_OregonRetailEmployeesPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_OregonRetailEmployeesPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_OregonRetailEmployeesPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_OregonRetailEmployeesPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		  
Most significant collective bargaining agreements count 3kr_MultiemployerPlansMostSignificantCollectiveBargainingArrangementNumber
/ us-gaap_MultiemployerPlanNameAxis
= kr_OregonRetailEmployeesPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		          
Multi-employer Pension Plan | Bakery and Confectionary Union & Industry International Pension Fund            
MULTI-EMPLOYER PLANS            
Employer contribution to multi-employer plans 11us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_BakeryAndConfectionaryUnionAndIndustryInternationalPensionFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 12us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_BakeryAndConfectionaryUnionAndIndustryInternationalPensionFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 10us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_BakeryAndConfectionaryUnionAndIndustryInternationalPensionFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		      
Minimum percentage of total contributions received by pension fund 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_BakeryAndConfectionaryUnionAndIndustryInternationalPensionFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_BakeryAndConfectionaryUnionAndIndustryInternationalPensionFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_BakeryAndConfectionaryUnionAndIndustryInternationalPensionFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_BakeryAndConfectionaryUnionAndIndustryInternationalPensionFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_BakeryAndConfectionaryUnionAndIndustryInternationalPensionFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		  
Most significant collective bargaining agreements count 4kr_MultiemployerPlansMostSignificantCollectiveBargainingArrangementNumber
/ us-gaap_MultiemployerPlanNameAxis
= kr_BakeryAndConfectionaryUnionAndIndustryInternationalPensionFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		          
Multi-employer Pension Plan | Washington Meat Industry Pension Trust            
MULTI-EMPLOYER PLANS            
Employer contribution to multi-employer plans 1us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_WashingtonMeatIndustryPensionTrustMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 3us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_WashingtonMeatIndustryPensionTrustMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 3us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_WashingtonMeatIndustryPensionTrustMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		      
Minimum percentage of total contributions received by pension fund 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_WashingtonMeatIndustryPensionTrustMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_WashingtonMeatIndustryPensionTrustMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_WashingtonMeatIndustryPensionTrustMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_WashingtonMeatIndustryPensionTrustMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_WashingtonMeatIndustryPensionTrustMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		  
Multi-employer Pension Plan | Retail Food Employers & UFCW Local 711 Pension            
MULTI-EMPLOYER PLANS            
Employer contribution to multi-employer plans 9us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_RetailFoodEmployersAndUFCWLocal711PensionMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 8us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_RetailFoodEmployersAndUFCWLocal711PensionMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 8us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_RetailFoodEmployersAndUFCWLocal711PensionMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		      
Minimum percentage of total contributions received by pension fund 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_RetailFoodEmployersAndUFCWLocal711PensionMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_RetailFoodEmployersAndUFCWLocal711PensionMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_RetailFoodEmployersAndUFCWLocal711PensionMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_RetailFoodEmployersAndUFCWLocal711PensionMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_RetailFoodEmployersAndUFCWLocal711PensionMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		  
Most significant collective bargaining agreements count 2kr_MultiemployerPlansMostSignificantCollectiveBargainingArrangementNumber
/ us-gaap_MultiemployerPlanNameAxis
= kr_RetailFoodEmployersAndUFCWLocal711PensionMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		          
Multi-employer Pension Plan | Denver Area Meat Cutters and Employers Pension Plan            
MULTI-EMPLOYER PLANS            
Employer contribution to multi-employer plans 8us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_DenverAreaMeatCuttersAndEmployersPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 8us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_DenverAreaMeatCuttersAndEmployersPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 8us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_DenverAreaMeatCuttersAndEmployersPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		      
Minimum percentage of total contributions received by pension fund 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_DenverAreaMeatCuttersAndEmployersPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_DenverAreaMeatCuttersAndEmployersPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_DenverAreaMeatCuttersAndEmployersPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_DenverAreaMeatCuttersAndEmployersPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_DenverAreaMeatCuttersAndEmployersPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		  
Most significant collective bargaining agreements count 1kr_MultiemployerPlansMostSignificantCollectiveBargainingArrangementNumber
/ us-gaap_MultiemployerPlanNameAxis
= kr_DenverAreaMeatCuttersAndEmployersPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		          
Multi-employer Pension Plan | United Food & Commercial Workers Intl Union - Industry Pension Fund            
MULTI-EMPLOYER PLANS            
Employer contribution to multi-employer plans 33us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_UnitedFoodAndCommercialWorkersIntlUnionIndustryPensionFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 33us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_UnitedFoodAndCommercialWorkersIntlUnionIndustryPensionFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 33us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_UnitedFoodAndCommercialWorkersIntlUnionIndustryPensionFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		      
Minimum percentage of total contributions received by pension fund 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_UnitedFoodAndCommercialWorkersIntlUnionIndustryPensionFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_UnitedFoodAndCommercialWorkersIntlUnionIndustryPensionFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_UnitedFoodAndCommercialWorkersIntlUnionIndustryPensionFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_UnitedFoodAndCommercialWorkersIntlUnionIndustryPensionFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_UnitedFoodAndCommercialWorkersIntlUnionIndustryPensionFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		  
Most significant collective bargaining agreements count 2kr_MultiemployerPlansMostSignificantCollectiveBargainingArrangementNumber
/ us-gaap_MultiemployerPlanNameAxis
= kr_UnitedFoodAndCommercialWorkersIntlUnionIndustryPensionFundMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		          
Multi-employer Pension Plan | Western Conference of Teamsters Pension Plan            
MULTI-EMPLOYER PLANS            
Employer contribution to multi-employer plans 30us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_WesternConferenceOfTeamstersPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 31us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_WesternConferenceOfTeamstersPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 30us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_WesternConferenceOfTeamstersPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		      
Most significant collective bargaining agreements count 5kr_MultiemployerPlansMostSignificantCollectiveBargainingArrangementNumber
/ us-gaap_MultiemployerPlanNameAxis
= kr_WesternConferenceOfTeamstersPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		          
Multi-employer Pension Plan | Central States, Southeast & Southwest Areas Pension Plan            
MULTI-EMPLOYER PLANS            
Employer contribution to multi-employer plans 15us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_CentralStatesSoutheastAndSouthwestAreasPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 15us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_CentralStatesSoutheastAndSouthwestAreasPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 12us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_CentralStatesSoutheastAndSouthwestAreasPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		      
Most significant collective bargaining agreements count 2kr_MultiemployerPlansMostSignificantCollectiveBargainingArrangementNumber
/ us-gaap_MultiemployerPlanNameAxis
= kr_CentralStatesSoutheastAndSouthwestAreasPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		          
Multi-employer Pension Plan | UFCW Consolidated Pension Plan            
MULTI-EMPLOYER PLANS            
Charge (after-tax) related to pension plan agreements           56kr_MultiemployerPlansCommitmentAndWithdrawalObligation
/ us-gaap_MultiemployerPlanNameAxis
= kr_UFCWConsolidatedPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember
Additional contributions 75kr_MultiemployerPlanPeriodAdditionalContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_UFCWConsolidatedPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		     75kr_MultiemployerPlanPeriodAdditionalContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_UFCWConsolidatedPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		    
Period of additional contribution 4 years          
Employer contribution to multi-employer plans 70us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_UFCWConsolidatedPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		   275us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_UFCWConsolidatedPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 15us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_UFCWConsolidatedPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 258us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_UFCWConsolidatedPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		  
Minimum percentage of total contributions received by pension fund 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_UFCWConsolidatedPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_UFCWConsolidatedPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_UFCWConsolidatedPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_UFCWConsolidatedPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 5.00%kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
/ us-gaap_MultiemployerPlanNameAxis
= kr_UFCWConsolidatedPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		  
Most significant collective bargaining agreements count 8kr_MultiemployerPlansMostSignificantCollectiveBargainingArrangementNumber
/ us-gaap_MultiemployerPlanNameAxis
= kr_UFCWConsolidatedPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		          
Multi-employer Pension Plan | Other            
MULTI-EMPLOYER PLANS            
Employer contribution to multi-employer plans $ 12us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_OtherMultiEmployerPlansMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 $ 13us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_OtherMultiEmployerPlansMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember		 $ 12us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kr_OtherMultiEmployerPlansMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember