| Document and Entity Information | Apr. 30, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Apr. 30, 2021 |
| Entity Registrant Name | WEYERHAEUSER COMPANY |
| Entity Central Index Key | 0000106535 |
| Entity Emerging Growth Company | false |
| Entity File Number | 1-4825 |
| Entity Incorporation State Country Code | WA |
| Entity Tax Identification Number | 91-0470860 |
| Entity Address Address Line1 | 220 Occidental Avenue South |
| Entity Address City Or Town | Seattle |
| Entity Address State Or Province | WA |
| Entity Address Postal Zip Code | 98104-7800 |
| City Area Code | (206) |
| Local Phone Number | 539-3000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of each class | Common Stock, par value $1.25 per share |
| Trading Symbol | WY |
| Name of each exchange on which registered | NYSE |
