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=63488584&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. 28, 2017 USD ($)	Nov. 05, 2016 USD ($)	Aug. 13, 2016 USD ($)	Jan. 30, 2016 USD ($)	Nov. 07, 2015 USD ($)	Aug. 15, 2015 USD ($)	May 21, 2016 USD ($)	May 23, 2015 USD ($)	Jan. 28, 2017 USD ($) segment	Jan. 30, 2016 USD ($) segment	Jan. 31, 2015 USD ($) segment
Segments
Company's retail operations (as a percent)									98.00%
Number of segments \| segment									1	1	1
Total Sales and other revenue	$ 27,611	$ 26,557	$ 26,565	$ 26,165	$ 25,075	$ 25,539	$ 34,604	$ 33,051	$ 115,337	$ 109,830	$ 108,465
Percentage of total sales									100.00%	100.00%	100.00%
Non Perishable
Segments
Total Sales and other revenue									$ 60,220	$ 57,187	$ 54,392
Percentage of total sales									52.20%	52.10%	50.10%
Perishable
Segments
Total Sales and other revenue									$ 27,666	$ 25,726	$ 24,178
Percentage of total sales									24.00%	23.40%	22.30%
Fuel
Segments
Total Sales and other revenue									$ 13,979	$ 14,802	$ 18,850
Percentage of total sales									12.10%	13.50%	17.40%
Pharmacy
Segments
Total Sales and other revenue									$ 10,432	$ 9,778	$ 9,032
Percentage of total sales									9.00%	8.90%	8.30%
Other
Segments
Total Sales and other revenue									$ 3,040	$ 2,337	$ 2,013
Percentage of total sales									2.70%	2.10%	1.90%