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 - SEGMENTS (Details) $ in Millions	3 Months Ended						4 Months Ended		12 Months Ended
ACCOUNTING POLICIES - SEGMENTS (Details) $ in Millions	Feb. 03, 2018 USD ($)	Nov. 04, 2017 USD ($)	Aug. 12, 2017 USD ($)	Jan. 28, 2017 USD ($)	Nov. 05, 2016 USD ($)	Aug. 13, 2016 USD ($)	May 20, 2017 USD ($)	May 21, 2016 USD ($)	Feb. 03, 2018 USD ($) segment	Jan. 28, 2017 USD ($) segment	Jan. 30, 2016 USD ($) segment
Segments
Company's retail operations (as a percent)									97.00%
Number of segments \| segment									1	1	1
Total Sales and other revenue	$ 31,031	$ 27,749	$ 27,597	$ 27,611	$ 26,557	$ 26,565	$ 36,285	$ 34,604	$ 122,662	$ 115,337	$ 109,830
Percentage of total sales									100.00%	100.00%	100.00%
Non Perishable
Segments
Total Sales and other revenue									$ 62,378	$ 60,220	$ 57,187
Percentage of total sales									50.90%	52.20%	52.10%
Perishable
Segments
Total Sales and other revenue									$ 29,145	$ 27,666	$ 25,726
Percentage of total sales									23.80%	24.00%	23.40%
Fuel
Segments
Total Sales and other revenue									$ 16,246	$ 13,979	$ 14,802
Percentage of total sales									13.20%	12.10%	13.50%
Pharmacy
Segments
Total Sales and other revenue									$ 10,752	$ 10,432	$ 9,778
Percentage of total sales									8.80%	9.00%	8.90%
Other
Segments
Total Sales and other revenue									$ 4,141	$ 3,040	$ 2,337
Percentage of total sales									3.30%	2.70%	2.10%