SEGMENT INFORMATION - Schedule of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Net Sales	$ 2,120	$ 2,259
Cost of Sales	1,675	1,733
Selling, General and Administrative	196	215
Other	28	33
Income (Loss) from Operations	221	278
Capital Expenditures	313	331
Depreciation and Amortization	131	148
Corporate and Other
Segment Reporting Information [Line Items]
Net Sales	121	203
Cost of Sales	113	184
Selling, General and Administrative	41	55
Other	14	1
Income (Loss) from Operations	(47)	(37)
Capital Expenditures	270	232
Depreciation and Amortization	59	62
Americas Paperboard Packaging | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	1,476	1,531
Cost of Sales	1,141	1,135
Selling, General and Administrative	94	99
Other	13	16
Income (Loss) from Operations	228	281
Capital Expenditures	19	62
Depreciation and Amortization	43	57
International Paperboard Packaging | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	523	525
Cost of Sales	421	414
Selling, General and Administrative	61	61
Other	1	16
Income (Loss) from Operations	40	34
Capital Expenditures	24	37
Depreciation and Amortization	$ 29	$ 29