BACKGROUND AND SUMMARY OF BUSINESS	12 Months Ended
BACKGROUND AND SUMMARY OF BUSINESS	Dec. 31, 2023
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. On December 3, 2020, International Paper Company (“International Paper“ or “Former Parent”) announced that its Board of Directors had approved a plan to spin-off its Printing Papers segment along with certain mixed-use coated paperboard and pulp businesses in Europe, Latin America, and North America (collectively referred to herein as the “Company,” “we,” “us,” or “our”), and separate into two distinct publicly-traded companies. On October 1, 2021, we settled the net parent investment and the spin-off was completed by a pro rata distribution to International Paper’s shareholders of approximately 80.1% of our common stock, with International Paper retaining a 19.9% ownership interest. As a result of the spin-off, Sylvamo Corporation became an independent public company. On September 12, 2022, International Paper sold its remaining shares of Sylvamo common stock. Therefore, International Paper is no longer a related party. Prior to the spin-off, we historically operated as part of International Paper and not as a standalone company. These consolidated and combined financial statements reflect the combined historical financial position, results of operations and cash flows of the Company as historically managed within International Paper for the periods prior to the completion of the spin-off and reflect our consolidated financial position, results of operations and cash flows for the period after the completion of the spin-off. The consolidated and combined financial statements have been prepared in United States (“U.S.”) dollars and in conformity with accounting principles generally accepted in the United States (‘‘U.S. GAAP’’). The consolidated and combined financial statements may not be indicative of the Company’s future performance and do not necessarily reflect what the results of operations, financial position and cash flows would have been had it operated as an independent company during all periods presented. For the periods prior to the spin-off, the consolidated and combined statements of operations also include expense allocations for certain functions provided by International Paper, including, but not limited to general corporate expenses related to finance, legal, information technology, human resources, communications, insurance and stock-based compensation. These expenses have been allocated to the Company on the basis of direct usage when identifiable, with the remainder principally allocated on the basis of percent of capital employed, headcount or other measures. During the year ended 2021 the Company was allocated approximately $119 million of such general corporate expenses related to continuing operations, which were included within “Cost of products sold” and “Selling and administrative expenses” in the consolidated and combined statements of operations. Management considers the basis on which the expenses have been allocated to reasonably reflect the utilization of services provided to or the benefit received by the Company during the periods presented. The allocations may not, however, reflect the expenses the Company would have incurred if the Company had been an independent company for all periods presented. Actual costs that may have been incurred if the Company had been an independent company during this period would depend on several factors, including the organizational structure, whether functions were outsourced or performed by employees, and strategic decisions made in areas such as information technology and infrastructure. The Company is unable to determine what such costs would have been had the Company been independent during these periods prior to the spin-off. In addition, certain of the Company’s Europe locations participated in International Paper’s centralized cash pooling arrangement. Amounts due from the cash pool were generally settled on a daily basis with the aggregate net activity between the Company and International Paper reflected in the consolidated and combined statements of cash flows as “Cash pool arrangements with Parent” within investing activities. Our participation in International Paper’s centralized cash pooling arrangements was terminated prior to September 30, 2021. International Paper utilized a centralized approach to cash management and financing its operations. This arrangement is not reflective of the manner in which the Company would have been able to finance its operations had it been independent from International Paper for the periods prior to the completion of the spin-off. The consolidated and combined financial statements for the periods prior to the completion of the spin-off include certain assets and liabilities that were historically held at the International Paper corporate level but were specifically identifiable or otherwise attributable to the Company. International Paper’s third-party debt and the related interest expense have not been allocated to the Company for any of the periods presented as the Company was not the legal obligor of such debt. During the third quarter of 2021, we entered into a series of financing transactions under which we incurred $1.5 billion of debt in conjunction with our spin-off from International Paper, consisting of two term loan facilities, the 7% senior notes due 2029 (the “2029 Senior Notes) and borrowings from our cash flow-based revolving credit facility. The proceeds of the debt were used primarily to fund a $1.5 billion special payment to International Paper as part of the spin-off. The Company operates on a calendar year-end. All intracompany transactions have been eliminated. Divestiture of Russian Operations During the second quarter of 2022, management committed to a plan to sell the Company’s Russian operations, which were previously part of the Europe business segment. As a result, all historical operating results of the Russian operations are presented as “Discontinued operations, net of taxes” in the consolidated and combined statement of operations and the notes to the consolidated and combined financial statements. In October 2022, the Company completed the sale of its Russian operations to Pulp Invest Limited Liability Company, a company incorporated in the Russian Federation. See Note 8 Divestiture and Impairment of Business for further details. 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. 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. See Note 7 Acquisitions for further details.