| Document and Entity Information | Feb. 17, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Entity Registrant Name | Owens Corning |
| Document Period End Date | Feb. 17, 2021 |
| 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 |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Security Exchange Name | NYSE |
| Trading Symbol | OC |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001370946 |
| Amendment Flag | false |
