VOLUNTARY RETIREMENT OFFERING (Details) $ in Millions	4 Months Ended
May 20, 2017 USD ($) employee
VOLUNTARY RETIREMENT OFFERING
Number of approximate associates that accepted Voluntary Retirement Offer \| employee	1,300
VRO charge, before-tax	$ 184
VRO charge, net of tax	117
VRO severance costs and other benefits	165
VRO other non-cash expense	19
VRO lump sum cash payments	$ 149

Number of approximate associates that accepted the Voluntary Retirement Offer.

No definition available.

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Represents the details pertaining to voluntary retirement offering.

No definition available.

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Represents the before-tax charge associated with Voluntary Retirement Offering.

No definition available.

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Amount of lump sum cash payments made during the period for the Voluntary Retirement Offering.

No definition available.

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Represents the net of tax charge associated with Voluntary Retirement Offering.

No definition available.

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Amount of other non-cash expenses resulting from Voluntary Retirement Offering during the period.

No definition available.

Name:	kr_VoluntaryRetirementOfferingOtherNonCashExpense
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Amount of severance and other benefit expenses resulting from Voluntary Retirement Offering.

No definition available.

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Data Type:	xbrli:monetaryItemType
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