Amount of asset impairment charges attributable to the parent entity.

No definition available.

Name:	kr_AssetImpairmentChargesAttributableToParent
Namespace Prefix:	kr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of asset impairment charges attributable to the parent entity, net of tax.

+ References

No definition available.

+ Details

Name:	kr_AssetImpairmentChargesAttributableToParentNetOfTax
Namespace Prefix:	kr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount after tax of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

No definition available.

+ Details

Name:	kr_BusinessCombinationContingentConsiderationArrangementsChangeInAmountNetOfTaxOfContingentConsiderationLiability
Namespace Prefix:	kr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount after tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

+ References

No definition available.

+ Details

Name:	kr_DisposalGroupNotDiscontinuedOperationGainLossOnDisposalNetOfTax
Namespace Prefix:	kr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of unrealized gain (loss) after tax on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

No definition available.

+ Details

Name:	kr_EquitySecuritiesFvNiUnrealizedGainLossNetOfTax
Namespace Prefix:	kr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of non-cash charges related to the write-off of investment, net of tax.

+ References

No definition available.

+ Details

Name:	kr_InvestmentWritedownNetOfTax
Namespace Prefix:	kr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of before tax non-cash charges related to the write-off of investment.

+ References

No definition available.

+ Details

Name:	kr_InvestmentsWritedown
Namespace Prefix:	kr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of the after-tax charge of commitments and withdrawal liabilities associated with the restructuring of pension plan agreements.

+ References

No definition available.

+ Details

Name:	kr_MultiemployerPlansCommitmentAndWithdrawalObligationAfterTax
Namespace Prefix:	kr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of the before-tax charge of commitments and withdrawal liabilities associated with the restructuring of pension plan agreements.

+ References

No definition available.

+ Details

Name:	kr_MultiemployerPlansCommitmentAndWithdrawalObligationBeforeTax
Namespace Prefix:	kr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of planned store closures.

+ References

No definition available.

+ Details

Name:	kr_NumberOfPlannedStoreClosures
Namespace Prefix:	kr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items for quarterly financial information.

+ References

No definition available.

+ Details

Name:	kr_QuarterlyInformationLineItems
Namespace Prefix:	kr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of expenses for special or contractual termination benefits, net of tax.

+ References

No definition available.

+ Details

Name:	kr_SeveranceCostsNetOfTax
Namespace Prefix:	kr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of transformation cost before tax.

+ References

No definition available.

+ Details

Name:	kr_TransformationCostBeforeTax
Namespace Prefix:	kr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of transformation cost after tax incurred during the reporting period.

+ References

No definition available.

+ Details

Name:	kr_TransformationCostNetOfTax
Namespace Prefix:	kr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

+ Details

Name:	us-gaap_AssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e7008-128479

+ Details

Name:	us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230

+ Details

Name:	us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3)(d))
-URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117546-209714

+ Details

Name:	us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

+ Details

Name:	us-gaap_SeveranceCosts1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=kr_TurkeyHillDairyBusinessMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=kr_YouTechnologyBusinessUnitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=kr_LuckysMarketMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupDisposedOfByMeansOtherThanSaleNotDiscontinuedOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

QUARTERLY DATA (UNAUDITED) - NARRATIVE (Details) $ in Millions			3 Months Ended						4 Months Ended		12 Months Ended
	Apr. 26, 2019 USD ($)	Mar. 13, 2019 USD ($)	Jan. 30, 2021 USD ($)	Nov. 07, 2020 USD ($)	Aug. 15, 2020 USD ($)	Feb. 01, 2020 USD ($) store	Nov. 09, 2019 USD ($)	Aug. 17, 2019 USD ($)	May 23, 2020 USD ($)	May 25, 2019 USD ($)	Jan. 30, 2021 USD ($)	Feb. 01, 2020 USD ($) store	Feb. 02, 2019 USD ($)
Quarterly Data
Severance expenses, before tax							$ 80					$ 80
Severance expenses, net of tax							61					61
Revaluation of contingent consideration			$ 80	$ 24	$ 25	$ (51)	4	$ 2	$ 60	$ (24)	$ 189	$ (69)	$ 33
Revaluation of contingent consideration, net of tax			61	17	19	(36)	3	2	44	(18)
Transformation cost before tax			11	33	29	52			38
Transformation cost net of tax			8	24	21	$ 37			28
Number of planned store closures \| store						35						35
Gain on sale of businesses										176		$ 176	1,782
Gain on investments			153	162	368	$ (9)	106	(45)	422	106	$ 1,105	157	228
Mark to market gain (loss) on Ocado securities, net of tax			116	$ 115	$ 278	(6)	81	(36)	$ 312	80
Asset Impairment Charges			0			0							0
Turkey Hill Dairy Business \| Disposed by Sale
Quarterly Data
Gain on sale of businesses	$ 106									106
Gain on sale of business, net of tax	$ 80									80
You Technology business unit \| Disposed by Sale
Quarterly Data
Gain on sale of businesses		$ 70								70
Gain on sale of business, net of tax		$ 52								52
Lucky's Market \| Disposal Group, Disposed of by Means Other than Sale
Quarterly Data
Asset Impairment Charges							238
Impairment charges attributable to The Kroger Co.							131					305
Impairment charges attributable to The Kroger Co., net of tax							100					225
Non-cash charges, before tax						174
Non-cash charges, net of tax						125
Pension Benefits
Quarterly Data
Charge (before-tax) related to pension plan agreements			989			4	45	27		59		135	155
Charge (after-tax) related to pension plan agreements			$ 754			$ 3	$ 35	$ 22		$ 44		$ 104	$ 121