REVENUE RECOGNITION Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 4,866	$ 5,667	$ 10,218	$ 11,310
North American Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,241	3,414	6,596	6,790
EMEA Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	297	331	647	670
Brazilian Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	42	58	96	115
European Coated Paperboard
Disaggregation of Revenue [Line Items]
Net sales	84	92	176	183
Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	605	661	1,173	1,350
North American Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	265	486	711	982
Brazilian Papers
Disaggregation of Revenue [Line Items]
Net sales	108	240	284	455
European Papers
Disaggregation of Revenue [Line Items]
Net sales	209	321	496	630
Indian Papers
Disaggregation of Revenue [Line Items]
Net sales	0	53	0	106
United States
Disaggregation of Revenue [Line Items]
Net sales	3,906	4,288	8,032	8,552
EMEA
Disaggregation of Revenue [Line Items]
Net sales	652	820	1,448	1,657
Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	40	121	81	240
Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	268	438	657	861
Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,633	3,864	7,452	7,696
Industrial Packaging | North American Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,241	3,414	6,596	6,790
Industrial Packaging | EMEA Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	297	331	647	670
Industrial Packaging | Brazilian Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	42	58	96	115
Industrial Packaging | European Coated Paperboard
Disaggregation of Revenue [Line Items]
Net sales	84	92	176	183
Industrial Packaging | United States
Disaggregation of Revenue [Line Items]
Net sales	3,065	3,205	6,195	6,351
Industrial Packaging | EMEA
Disaggregation of Revenue [Line Items]
Net sales	379	420	819	848
Industrial Packaging | Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	16	12	28	30
Industrial Packaging | Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	173	227	410	467
Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	605	661	1,173	1,350
Global Cellulose Fibers | Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	605	661	1,173	1,350
Global Cellulose Fibers | United States
Disaggregation of Revenue [Line Items]
Net sales	534	551	1,028	1,121
Global Cellulose Fibers | EMEA
Disaggregation of Revenue [Line Items]
Net sales	60	64	116	145
Global Cellulose Fibers | Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	11	46	29	84
Global Cellulose Fibers | Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	583	1,088	1,491	2,153
Printing Papers | North American Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	265	486	711	982
Printing Papers | Brazilian Papers
Disaggregation of Revenue [Line Items]
Net sales	108	240	284	455
Printing Papers | European Papers
Disaggregation of Revenue [Line Items]
Net sales	209	321	496	630
Printing Papers | Indian Papers
Disaggregation of Revenue [Line Items]
Net sales	0	53	0	106
Printing Papers | United States
Disaggregation of Revenue [Line Items]
Net sales	263	474	707	962
Printing Papers | EMEA
Disaggregation of Revenue [Line Items]
Net sales	219	341	521	671
Printing Papers | Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	6	61	14	120
Printing Papers | Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	95	212	249	400
Operating Segments [Member] | Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,633	3,864	7,452	7,696
Operating Segments [Member] | Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	605	661	1,173	1,350
Operating Segments [Member] | Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	583	1,088	1,491	2,153
Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Net sales	(30)	(43)	(63)	(82)
Intersegment Eliminations [Member] | Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	(31)	(31)	(63)	(62)
Intersegment Eliminations [Member] | Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	1	(12)	0	(20)
Geography Eliminations [Member] | Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,633	3,864	7,452	7,696
Geography Eliminations [Member] | Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	605	661	1,173	1,350
Geography Eliminations [Member] | Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	583	1,088	1,491	2,153
Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Net sales	45	54	102	111
Consolidation, Eliminations | United States
Disaggregation of Revenue [Line Items]
Net sales	44	58	102	118
Consolidation, Eliminations | EMEA
Disaggregation of Revenue [Line Items]
Net sales	(6)	(5)	(8)	(7)
Consolidation, Eliminations | Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	7	2	10	6
Consolidation, Eliminations | Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	$ 0	$ (1)	$ (2)	$ (6)