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BACKGROUND AND SUMMARY OF BUSINESS	12 Months Ended
BACKGROUND AND SUMMARY OF BUSINESS	Dec. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BACKGROUND AND SUMMARY OF BUSINESS	BACKGROUND AND SUMMARY OF BUSINESS BACKGROUND Sylvamo Corporation (NYSE: SLVM) is the world’s paper company with mills in Europe, Latin America and North America. Our vision is to be the employer, supplier and investment of choice. We transform renewable resources into papers that people depend on for education, communication and entertainment. The Company operates on a calendar year-end. Acquisition of Nymölla On January 2, 2023, the Company completed the previously announced acquisition of Stora Enso’s uncoated freesheet paper mill in Nymölla, Sweden, for €157 million (approximately $167 million) after post-close working capital adjustments. Sylvamo accounted for the acquisition under ASC 805, “Business Combinations” and the Nymölla mill’s results of operations are included in Sylvamo’s consolidated financial statements from the date of acquisition.