INVESTMENT IN VARIABLE INTEREST ENTITY (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended
Feb. 28, 2010
INVESTMENT IN VARIABLE INTEREST ENTITY
Investment in the remaining interest of a variable interest entity	$ 86

This element represents the purchase amount for the remaining interest in a consolidated VIE, which the entity recorded as an equity transaction.

No definition available.

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