GOODWILL AND OTHER INTANGIBLES Changes in Goodwill Balances (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2021	Dec. 31, 2020
Goodwill [Line Items]
Beginning balance		$ 5,428
Accumulated impairment losses		(2,113)
Goodwill		3,274	$ 3,315
Currency translation and other (a)	[1]	(13)
Goodwill additions/reductions		(28)
Accumulated impairment loss additions / reductions		0
Accumulated impairment losses		(2,113)
Ending balance		5,387
Industrial Packaging
Goodwill [Line Items]
Beginning balance		3,410
Accumulated impairment losses		(296)
Goodwill		3,138	3,114
Currency translation and other (a)	[1]	(5)
Goodwill additions/reductions	[2]	29
Accumulated impairment loss additions / reductions		0
Accumulated impairment losses		(296)
Ending balance		3,434
Global Cellulose Fibers
Goodwill [Line Items]
Beginning balance		52
Accumulated impairment losses		(52)
Goodwill		0	0
Currency translation and other (a)	[1]	0
Goodwill additions/reductions		0
Accumulated impairment loss additions / reductions		0
Accumulated impairment losses		(52)
Ending balance		52
Printing Papers
Goodwill [Line Items]
Beginning balance		1,966
Accumulated impairment losses		(1,765)
Goodwill		136	$ 201
Currency translation and other (a)	[1]	(8)
Goodwill additions/reductions	[3]	(57)
Accumulated impairment loss additions / reductions		0
Accumulated impairment losses		(1,765)
Ending balance		$ 1,901

[1] Represents the effects of foreign currency translations

[2] Reflects the box plant acquisitions in EMEA.

[3] Reflects the Kwidzyn sale