REVENUE RECOGNITION Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 5,667	$ 5,833	$ 11,310	$ 11,454
North American Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,414	3,582	6,790	6,951
EMEA Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	331	344	670	706
Brazilian Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	58	56	115	118
European Coated Paperboard
Disaggregation of Revenue [Line Items]
Net sales	92	86	183	178
Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	661	692	1,350	1,369
North American Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	486	493	982	951
Brazilian Papers
Disaggregation of Revenue [Line Items]
Net sales	240	222	455	451
European Papers
Disaggregation of Revenue [Line Items]
Net sales	321	302	630	621
Indian Papers
Disaggregation of Revenue [Line Items]
Net sales	53	51	106	103
United States
Disaggregation of Revenue [Line Items]
Net sales	4,288	4,439	8,552	8,584
EMEA
Disaggregation of Revenue [Line Items]
Net sales	820	817	1,657	1,675
Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	121	156	240	327
Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	438	421	861	868
Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,864	4,022	7,696	7,849
Industrial Packaging | North American Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,414	3,582	6,790	6,951
Industrial Packaging | EMEA Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	331	344	670	706
Industrial Packaging | Brazilian Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	58	56	115	118
Industrial Packaging | European Coated Paperboard
Disaggregation of Revenue [Line Items]
Net sales	92	86	183	178
Industrial Packaging | United States
Disaggregation of Revenue [Line Items]
Net sales	3,205	3,336	6,351	6,438
Industrial Packaging | EMEA
Disaggregation of Revenue [Line Items]
Net sales	420	427	848	879
Industrial Packaging | Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	12	36	30	70
Industrial Packaging | Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	227	223	467	462
Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	661	692	1,350	1,369
Global Cellulose Fibers | Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	661	692	1,350	1,369
Global Cellulose Fibers | United States
Disaggregation of Revenue [Line Items]
Net sales	551	573	1,121	1,118
Global Cellulose Fibers | EMEA
Disaggregation of Revenue [Line Items]
Net sales	64	70	145	145
Global Cellulose Fibers | Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	46	48	84	105
Global Cellulose Fibers | Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	0	1	0	1
Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	1,088	1,060	2,153	2,113
Printing Papers | North American Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	486	493	982	951
Printing Papers | Brazilian Papers
Disaggregation of Revenue [Line Items]
Net sales	240	222	455	451
Printing Papers | European Papers
Disaggregation of Revenue [Line Items]
Net sales	321	302	630	621
Printing Papers | Indian Papers
Disaggregation of Revenue [Line Items]
Net sales	53	51	106	103
Printing Papers | United States
Disaggregation of Revenue [Line Items]
Net sales	474	477	962	917
Printing Papers | EMEA
Disaggregation of Revenue [Line Items]
Net sales	341	324	671	660
Printing Papers | Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	61	59	120	123
Printing Papers | Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	212	200	400	413
Operating Segments [Member] | Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,864	4,022	7,696	7,849
Operating Segments [Member] | Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	661	692	1,350	1,369
Operating Segments [Member] | Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	1,088	1,060	2,153	2,113
Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Net sales	54	59	111	123
Intersegment Eliminations [Member] | United States
Disaggregation of Revenue [Line Items]
Net sales	58	53	118	111
Intersegment Eliminations [Member] | EMEA
Disaggregation of Revenue [Line Items]
Net sales	(5)	(4)	(7)	(9)
Intersegment Eliminations [Member] | Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	2	13	6	29
Intersegment Eliminations [Member] | Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	(1)	(3)	(6)	(8)
Geography Eliminations [Member] | Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,864	4,022	7,696	7,849
Geography Eliminations [Member] | Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	661	692	1,350	1,369
Geography Eliminations [Member] | Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	1,088	1,060	2,153	2,113
Subsegments Consolidation Items [Domain]
Disaggregation of Revenue [Line Items]
Net sales	(43)	(54)	(82)	(117)
Subsegments Consolidation Items [Domain] | Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	(31)	(46)	(62)	(104)
Subsegments Consolidation Items [Domain] | Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	$ (12)	$ (8)	$ (20)	$ (13)