COMPANY-SPONSORED BENEFIT PLANS - LEVEL 3 RECONCILIATION (Details) - Recurring - USD ($) $ in Millions	12 Months Ended
Feb. 03, 2018	Jan. 28, 2017
Roll-forward of assets measured at fair value using Level 3 inputs
Fair value of plan assets at beginning of fiscal year	$ 3,138
Fair value of plan assets at end of fiscal year	2,943	$ 3,138
Significant Unobservable Inputs (Level 3)
Roll-forward of assets measured at fair value using Level 3 inputs
Fair value of plan assets at beginning of fiscal year	132
Fair value of plan assets at end of fiscal year	124	132
Hedge Funds
Roll-forward of assets measured at fair value using Level 3 inputs
Fair value of plan assets at beginning of fiscal year	1,101
Fair value of plan assets at end of fiscal year	601	1,101
Hedge Funds \| Significant Unobservable Inputs (Level 3)
Roll-forward of assets measured at fair value using Level 3 inputs
Fair value of plan assets at beginning of fiscal year	67	61
Contributions into Fund	13	10
Realized gains	1	1
Unrealized gains (losses)	5	(1)
Distributions	(30)	(4)
Fair value of plan assets at end of fiscal year	56	67
Real Estate
Roll-forward of assets measured at fair value using Level 3 inputs
Fair value of plan assets at beginning of fiscal year	87
Fair value of plan assets at end of fiscal year	90	87
Real Estate \| Significant Unobservable Inputs (Level 3)
Roll-forward of assets measured at fair value using Level 3 inputs
Fair value of plan assets at beginning of fiscal year	65	79
Contributions into Fund	11	9
Realized gains	3	12
Unrealized gains (losses)	8	(2)
Distributions	(19)	(32)
Other		(1)
Fair value of plan assets at end of fiscal year	$ 68	$ 65

This element represents the distributions on plan assets of defined benefit plans for the period.

No definition available.

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

- Definition

Changes in the fair value of plan assets as a result of other items not defined in the taxonomy.

+ References

No definition available.

+ Details

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

- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold.

+ References

+ Details

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

- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held.

+ References

+ Details

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

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)(ii)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)(iv)(01)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

+ Details

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

- Definition

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_HedgeFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_RealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: