REVENUE RECOGNITION Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Net sales	$ 6,767	$ 4,734	$ 12,668	$ 9,353
Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	6,779	4,673	12,674	9,211
Corporate & Intersegment
Disaggregation of Revenue [Line Items]
Net sales	(12)	61	(6)	142
United States
Disaggregation of Revenue [Line Items]
Net sales	4,259	4,154	8,382	8,150
United States | Corporate & Intersegment
Disaggregation of Revenue [Line Items]
Net sales	(12)	61	(6)	142
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Net sales	2,312	345	3,885	713
Europe, Middle East and Africa | Corporate & Intersegment
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	9	50	21	98
Pacific Rim and Asia | Corporate & Intersegment
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	187	185	380	392
Americas, other than U.S. | Corporate & Intersegment
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Packaging Solutions North America | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	3,860	3,628	7,562	7,114
Packaging Solutions North America | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	3,664	3,424	7,162	6,689
Packaging Solutions North America | Europe, Middle East and Africa | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Packaging Solutions North America | Pacific Rim and Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	9	19	20	33
Packaging Solutions North America | Americas, other than U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	187	185	380	392
Packaging Solutions EMEA | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	2,291	328	3,841	676
Packaging Solutions EMEA | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Packaging Solutions EMEA | Europe, Middle East and Africa | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	2,291	328	3,841	676
Packaging Solutions EMEA | Pacific Rim and Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Packaging Solutions EMEA | Americas, other than U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Global Cellulose Fibers | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	628	717	1,271	1,421
Global Cellulose Fibers | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	607	669	1,226	1,319
Global Cellulose Fibers | Europe, Middle East and Africa | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	21	17	44	37
Global Cellulose Fibers | Pacific Rim and Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	0	31	1	65
Global Cellulose Fibers | Americas, other than U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	$ 0	$ 0	$ 0	$ 0