BENEFIT PLANS - MULTI EMPLOYER PENSION PLAN OBLIGATIONS (Details) - Multi-employer Pension Plan $ in Millions	4 Months Ended
May 20, 2017 USD ($) item
Multiemployer Plans
Charge (before-tax) related to pension plan agreements	$ 199
Charge (after-tax) related to pension plan agreements	$ 126
Number of multi-employer pension plans withdrawn \| item	2
Multi-employer pension plan liability payout period	20 years

Represents the after-tax charge of commitments associated with the restructuring of pension plan agreements.

No definition available.

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

- Definition

Represents the before-tax charge of commitments associated with the restructuring of pension plan agreements.

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No definition available.

+ Details

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

- Definition

Represents the period in which the multi-employer pension plan withdrawal liability will be repaid.

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No definition available.

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Name:	kr_MultiemployerPlansLiabilityPaymentPeriod
Namespace Prefix:	kr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of multi-employer pension plans withdrawn during the period.

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No definition available.

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Data Type:	xbrli:integerItemType
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Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Details

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Namespace Prefix:
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Period Type: