FINANCIAL INFORMATION BY BUSINESS SEGMENT AND GEOGRAPHIC AREA (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)
Segment Reporting [Line Items]
NET SALES	$ 806	$ 794	$ 1,561	$ 1,615
Cost of products sold and other	642	581	1,282	1,217
Maintenance outages	41	66	58	93
Economic downtime		0		3
Selling and administrative expenses, excluding Corporate Special Items	65	72	137	145
Depreciation, amortization and cost of timber harvested	43	45	84	85
Other Nonrecurring (Income) Expense	(1)	0	(1)	2
Operating Income (Loss)	14	30	(1)	74
Interest expense, net	11	10	20	19
Foreign exchange gain on intercompany note	(1)		(20)	0
Assets	2,875	2,763	2,875	2,763	$ 2,763
Payments to Acquire Productive Assets	$ 110	114
Number of Reportable Segments	3
Other Nonrecurring (Income) Expense, Net	$ 3	0	4	2
Net income (loss)	(11)	15	(14)	42
Income Tax Expense (Benefit)	12	5	9	11
Europe Segment [Member]
Segment Reporting [Line Items]
NET SALES	192	181	380	371
Latin America Segment [Member]
Segment Reporting [Line Items]
NET SALES	203	194	380	387
North America Segment [Member]
Segment Reporting [Line Items]
NET SALES	411	419	801	857
Operating Segments
Segment Reporting [Line Items]
NET SALES	806	794	1,561	1,615
Revenue from Contracts with Customers, including Intersegment Sales	827	807	1,594	1,634
Operating Segments | Europe Segment [Member]
Segment Reporting [Line Items]
NET SALES	192	181	380	371
Cost of products sold and other	191	168	402	347
Maintenance outages	3	28	3	40
Economic downtime		0		0
Selling and administrative expenses, excluding Corporate Special Items	11	15	24	30
Depreciation, amortization and cost of timber harvested	7	8	15	16
Other Nonrecurring (Income) Expense	0	0	0	0
Operating Income (Loss)	(20)	(38)	(64)	(62)
Assets	482	500	482	500
Payments to Acquire Productive Assets	8	22
Revenue from Contracts with Customers, including Intersegment Sales	197	181	387	371
Operating Segments | Latin America Segment [Member]
Segment Reporting [Line Items]
NET SALES	203	194	380	387
Cost of products sold and other	151	125	277	253
Maintenance outages	21	20	24	21
Economic downtime		0		0
Selling and administrative expenses, excluding Corporate Special Items	22	23	45	44
Depreciation, amortization and cost of timber harvested	24	23	45	41
Other Nonrecurring (Income) Expense	(1)	(1)	(1)	0
Operating Income (Loss)	(16)	2	(12)	28
Assets	1,279	1,231	1,279	1,231
Payments to Acquire Productive Assets	49	62
Revenue from Contracts with Customers, including Intersegment Sales	219	207	406	406
Operating Segments | North America Segment [Member]
Segment Reporting [Line Items]
NET SALES	411	419	801	857
Cost of products sold and other	300	288	603	617
Maintenance outages	17	18	31	32
Economic downtime		0		3
Selling and administrative expenses, excluding Corporate Special Items	32	34	68	71
Depreciation, amortization and cost of timber harvested	12	14	24	28
Other Nonrecurring (Income) Expense	0	1	0	2
Operating Income (Loss)	50	66	75	108
Assets	973	884	973	884
Payments to Acquire Productive Assets	53	30
Revenue from Contracts with Customers, including Intersegment Sales	411	419	801	857
Segment Reconciling Items
Segment Reporting [Line Items]
Other Nonrecurring (Income) Expense	(1)	0	(1)	2
Interest expense, net	11	10	20	19
Segment Reconciling Items | Georgetown Mill Offtake Termination
Segment Reporting [Line Items]
Other Nonrecurring (Income) Expense	0	1	0	2
Segment Reconciling Items | Brazil Environmental Reserve Adjustment
Segment Reporting [Line Items]
Other Nonrecurring (Income) Expense	(1)	0	(1)	1
Segment Reconciling Items | Brazil Foreign Value-Added Tax Refund
Segment Reporting [Line Items]
Other Nonrecurring (Income) Expense	0	(1)	0	(1)
Intersegment Eliminations [Member]
Segment Reporting [Line Items]
NET SALES	(21)	(13)	(33)	(19)
Intersegment Eliminations [Member] | Europe Segment [Member]
Segment Reporting [Line Items]
NET SALES	(5)	0	(7)	0
Intersegment Eliminations [Member] | Latin America Segment [Member]
Segment Reporting [Line Items]
NET SALES	(16)	(13)	(26)	(19)
Intersegment Eliminations [Member] | North America Segment [Member]
Segment Reporting [Line Items]
NET SALES	0	0	0	0
Segment Reporting, Reconciling Item, Corporate Nonsegment
Segment Reporting [Line Items]
Other Nonrecurring (Income) Expense	4	0	5	0
Assets	141	148	141	148
Segment Reporting, Reconciling Item, Corporate Nonsegment | Strategic Professional and Legal Fees
Segment Reporting [Line Items]
Other Nonrecurring (Income) Expense	4	0	4	0
Segment Reporting, Reconciling Item, Corporate Nonsegment | Other Charges
Segment Reporting [Line Items]
Other Nonrecurring (Income) Expense	$ 0	$ 0	$ 1	$ 0