| Document and Entity Information Document | Jul. 24, 2019 |
| Cover page. | |
| Document Type | 8-K |
| Document Period End Date | Jul. 24, 2019 |
| Entity Registrant Name | Owens Corning |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 1-33100 |
| Entity Tax Identification Number | 43-2109021 |
| Entity Address, Address Line One | One Owens Corning Parkway |
| Entity Address, City or Town | Toledo |
| Entity Address, State or Province | OH |
| Entity Address, Postal Zip Code | 43659 |
| City Area Code | 419 |
| Local Phone Number | 248-8000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001370946 |
| Amendment Flag | false |
