BUSINESS SEGMENT INFORMATION, EXTERNAL SALES BY MAJOR PRODUCT (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	$ 6,767	$ 4,734	$ 12,668	$ 9,353
Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	6,779	4,673	12,674	9,211
Operating Segments | Packaging Solutions North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	3,860	3,628	7,562	7,114
Operating Segments | Packaging Solutions EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	2,291	328	3,841	676
Operating Segments | Global Cellulose Fibers
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	628	717	1,271	1,421
Operating Segments | External Customers | Packaging Solutions North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	3,803	3,603	7,471	7,063
Operating Segments | External Customers | Packaging Solutions EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	2,291	328	3,841	676
Operating Segments | External Customers | Global Cellulose Fibers
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	624	715	1,261	1,419
Other | External Customers | Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	$ 49	$ 88	$ 95	$ 195