GOODWILL AND OTHER INTANGIBLES Changes in Goodwill Balances (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Goodwill [Line Items]
Goodwill, Gross		$ 7,429	$ 3,462
Goodwill, Impaired, Accumulated Impairment Loss		(187)	(424)	$ (237)
Goodwill		7,242	3,038
Goodwill additions/reductions (a)	[1],[2]	4,048
Goodwill, Translation and Measurement Period Adjustments	[3]	156
Goodwill, Gross Write-Offs				$ (237)
Packaging Solutions North America
Goodwill [Line Items]
Goodwill, Gross		3,433	3,334
Goodwill, Impaired, Accumulated Impairment Loss		(59)	(296)
Goodwill		3,374	3,038
Goodwill additions/reductions (a)	[1],[2]	336
Goodwill, Translation and Measurement Period Adjustments	[3]	0
Global Cellulose Fibers
Goodwill [Line Items]
Goodwill, Gross		52	52
Goodwill, Impaired, Accumulated Impairment Loss		(52)	(52)
Goodwill		0	0
Goodwill additions/reductions (a)	[1],[2]	0
Goodwill, Translation and Measurement Period Adjustments	[3]	0
Packaging Solutions EMEA
Goodwill [Line Items]
Goodwill, Gross		3,944	76
Goodwill, Impaired, Accumulated Impairment Loss		(76)	(76)
Goodwill		3,868	$ 0
Goodwill additions/reductions (a)	[1],[2]	3,712
Goodwill, Translation and Measurement Period Adjustments	[3]	$ 156

[1] Includes write-offs of previously impaired goodwill of $237 million and accumulated impairment losses of $(237) million. 

[2] Reflects the acquisition of DS Smith. See Note 8 for further details.

[3] Represents the effects of foreign currency translations and reclassifications.