This element represents the percentage of sales and EBITDA for its only reportable segment to total sales.

No definition available.

Name:	kr_CompanyRetailOperationPercentOfSales
Namespace Prefix:	kr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents the percentage of sales for this product to the total during the reporting period.

+ References

No definition available.

+ Details

Name:	kr_PercentageOfTotalSales
Namespace Prefix:	kr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

Name:	us-gaap_SalesRevenueGoodsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_ProductOrServiceAxis=kr_NonPerishableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=kr_PerishableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=us-gaap_FuelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=kr_PharmacyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=kr_OtherProductMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

ACCOUNTING POLICIES - REVENUE BY PRODUCT TYPE (Details) $ in Millions	3 Months Ended						4 Months Ended		12 Months Ended
	Jan. 30, 2016 USD ($)	Nov. 07, 2015 USD ($)	Aug. 15, 2015 USD ($)	Jan. 31, 2015 USD ($)	Nov. 08, 2014 USD ($)	Aug. 16, 2014 USD ($)	May. 23, 2015 USD ($)	May. 24, 2014 USD ($)	Jan. 30, 2016 USD ($) segment	Jan. 31, 2015 USD ($) segment	Feb. 01, 2014 USD ($) segment
Segments
Company's retail operations (as a percent)									99.00%
Number of segments \| segment									1	1	1
Total Sales and other revenue	$ 26,165	$ 25,075	$ 25,539	$ 25,207	$ 24,987	$ 25,310	$ 33,051	$ 32,961	$ 109,830	$ 108,465	$ 98,375
Percentage of total sales									100.00%	100.00%	100.00%
Non Perishable
Segments
Total Sales and other revenue									$ 57,187	$ 54,392	$ 49,229
Percentage of total sales									52.10%	50.10%	50.00%
Perishable
Segments
Total Sales and other revenue									$ 25,726	$ 24,178	$ 20,625
Percentage of total sales									23.40%	22.30%	21.00%
Fuel
Segments
Total Sales and other revenue									$ 14,802	$ 18,850	$ 18,962
Percentage of total sales									13.50%	17.40%	19.30%
Pharmacy
Segments
Total Sales and other revenue									$ 9,778	$ 9,032	$ 8,073
Percentage of total sales									8.90%	8.30%	8.20%
Other
Segments
Total Sales and other revenue									$ 2,337	$ 2,013	$ 1,486
Percentage of total sales									2.10%	1.90%	1.50%