RELATED PARTY TRANSACTIONS - Summary of Components of Net Transfers From (To) Parent (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Related Party Transaction [Line Items]
Net transfers to Parent	$ (487)	$ (22)	$ (479)	$ (190)
Affiliated Entity | International Paper
Related Party Transaction [Line Items]
Net transfers to Parent	(487)	(22)	(479)	(190)
Affiliated Entity | General financing activities | International Paper
Related Party Transaction [Line Items]
Net transfers to Parent	(522)	(63)	(601)	(310)
Affiliated Entity | Corporate allocations | International Paper
Related Party Transaction [Line Items]
Net transfers to Parent	32	37	112	109
Affiliated Entity | Stock-based compensation | International Paper
Related Party Transaction [Line Items]
Net transfers to Parent	$ 3	$ 4	$ 10	$ 11