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Cover Page - USD ($)	12 Months Ended
Cover Page - USD ($)	Dec. 31, 2025	Feb. 13, 2026	Jun. 30, 2025
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2025
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-40718
Entity Registrant Name	SYLVAMO CORPORATION
Entity Incorporation, State or 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
Entity Central Index Key	0001856485
Amendment Flag	false
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2025
Auditor Firm ID	34
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 2,008,755,141
Entity Common Stock, Shares Outstanding		39,508,287
Documents Incorporated by Reference [Text Block]	Documents incorporated by reference: Portions of the registrant’s proxy statement filed within 120 days of the close of the registrant’s fiscal year in connection with the registrant’s 2026 annual meeting of shareholders are incorporated by reference into Part III of this Form 10-K.
Document Financial Statement Error Correction [Flag]	false
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $1.00 per share
Trading Symbol	SLVM
Security Exchange Name	NYSE
Preferred Stock
Document Information [Line Items]
Title of 12(b) Security	Preferred Stock Purchase Rights
Trading Symbol	SLVM
Security Exchange Name	NYSE