| Cover | Jul. 21, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Amendment Description | On July 22, 2020, The Kroger Co. filed a Current Report on Form 8-K with the Securities and Exchange Commission to report the Company’s issuance of a press release announcing that the Company had reached a tentative agreement with UFCW local unions. This Amendment to the 8-K corrects the inadvertent omission of the words “to exceed” in the first sentence described below. |
| Document Period End Date | Jul. 21, 2020 |
| Entity File Number | 1-303 |
| Entity Registrant Name | Kroger Co. |
| Entity Central Index Key | 0000056873 |
| Entity Tax Identification Number | 31-0345740 |
| Entity Incorporation, State or Country Code | OH |
| Entity Address, Address Line One | 1014 Vine Street |
| Entity Address, City or Town | Cincinnati |
| Entity Address, State or Province | OH |
| Entity Address, Postal Zip Code | 45202 |
| City Area Code | 513 |
| Local Phone Number | 762-4000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock $1 par value |
| Trading Symbol | KR |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
