COMPANY-SPONSORED BENEFIT PLANS - DEFINED CONTRIBUTION PLAN INFORMATION (Details) - USD ($) $ in Millions	12 Months Ended
Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
COMPANY- SPONSORED BENEFIT PLANS
Contribution to employee 401(k) retirement savings accounts	$ 215	$ 196	$ 177

The amount of contributions to employee 401(k) retirement savings accounts made by the employer.

No definition available.

Name:	kr_DefinedContributionPlanContributionsByEmployer
Namespace Prefix:	kr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration