| Document and Entity Information | Oct. 30, 2024 |
| Cover [Abstract] | |
| Entity Registrant Name | Sylvamo Corp |
| Amendment Flag | false |
| Entity Central Index Key | 0001856485 |
| Document Type | 8-K |
| Document Period End Date | Oct. 30, 2024 |
| Entity File Number | 001-40718 |
| Entity Incorporation State Country Code | DE |
| Entity Tax Identification Number | 86-2596371 |
| Entity Address, Address Line One | 6077 Primacy Parkway |
| Entity Address, City or Town | Memphis |
| Entity Address, State or Province | TN |
| Entity Address, Postal Zip Code | 38119 |
| City Area Code | (901) |
| Local Phone Number | 519-8000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $1 per share par value |
| Trading Symbol | SLVM |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
