EQUITY - Narrative (Details) - $ / shares	Apr. 22, 2022	Sep. 30, 2022	May 02, 2022	Dec. 31, 2021
Class of Warrant or Right [Line Items]
Common stock, par value (in dollars per share)		$ 1		$ 1
Rights Agreement
Class of Warrant or Right [Line Items]
Common stock, par value (in dollars per share)	$ 1.00
Ownership percentage threshold of existing shareholders to be grandfathered in	10.00%
Class of right, exercisable price multiplier	2
Percentage of the company's consolidated assets or earnings power merged or sold that would trigger preferred share purchase rights			50.00%
Series A Preferred Stock
Class of Warrant or Right [Line Items]
Class of right, number of securities called by each right (in shares)	0.001
Series A Preferred Stock | Rights Agreement
Class of Warrant or Right [Line Items]
Preferred share purchase right for each share of sylvamo common stock	$ 1
Preferred stock, par value (in dollars per share)	1.00
Class of right, exercise price of rights (in dollars per share)	$ 190.00
Ownership threshold at which preferred share rights become exercisable	10.00%
Ownership threshold at which preferred share rights become exercisable, passive investors	20.00%