SUBSEQUENT EVENTS (Details)	Apr. 22, 2022 right $ / shares shares	May 02, 2022	Mar. 31, 2022 $ / shares	Dec. 31, 2021 $ / shares
Subsequent Event [Line Items]
Common stock, par value (in dollars per share)			$ 1	$ 1
Subsequent Event | Rights Agreement
Subsequent Event [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%
Subsequent Event | Series A Preferred Stock
Subsequent Event [Line Items]
Class of right, number of securities called by each right (in shares) | shares	0.001
Subsequent Event | Series A Preferred Stock | Rights Agreement
Subsequent Event [Line Items]
Preferred share purchase right for each share of sylvamo common stock | right	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%