REVENUE RECOGNITION Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 5,643	$ 5,621
North American Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,376	3,369
EMEA Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	339	362
Brazilian Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	57	62
European Coated Paperboard
Disaggregation of Revenue [Line Items]
Net sales	91	92
Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	689	677
North American Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	496	458
Brazilian Papers
Disaggregation of Revenue [Line Items]
Net sales	215	229
European Papers
Disaggregation of Revenue [Line Items]
Net sales	309	319
Indian Papers
Disaggregation of Revenue [Line Items]
Net sales	53	52
United States
Disaggregation of Revenue [Line Items]
Net sales	4,264	4,145
EMEA
Disaggregation of Revenue [Line Items]
Net sales	837	858
Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	119	171
Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	423	447
Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,832	3,827
Industrial Packaging | North American Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,376	3,369
Industrial Packaging | EMEA Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	339	362
Industrial Packaging | Brazilian Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	57	62
Industrial Packaging | European Coated Paperboard
Disaggregation of Revenue [Line Items]
Net sales	91	92
Industrial Packaging | United States
Disaggregation of Revenue [Line Items]
Net sales	3,146	3,102
Industrial Packaging | EMEA
Disaggregation of Revenue [Line Items]
Net sales	428	452
Industrial Packaging | Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	18	34
Industrial Packaging | Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	240	239
Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	689	677
Global Cellulose Fibers | Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	689	677
Global Cellulose Fibers | United States
Disaggregation of Revenue [Line Items]
Net sales	570	545
Global Cellulose Fibers | EMEA
Disaggregation of Revenue [Line Items]
Net sales	81	75
Global Cellulose Fibers | Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	38	57
Global Cellulose Fibers | Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	0	0
Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	1,065	1,053
Printing Papers | North American Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	496	458
Printing Papers | Brazilian Papers
Disaggregation of Revenue [Line Items]
Net sales	215	229
Printing Papers | European Papers
Disaggregation of Revenue [Line Items]
Net sales	309	319
Printing Papers | Indian Papers
Disaggregation of Revenue [Line Items]
Net sales	53	52
Printing Papers | United States
Disaggregation of Revenue [Line Items]
Net sales	488	440
Printing Papers | EMEA
Disaggregation of Revenue [Line Items]
Net sales	330	336
Printing Papers | Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	59	64
Printing Papers | Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	188	213
Operating Segments [Member] | Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,832	3,827
Operating Segments [Member] | Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	689	677
Operating Segments [Member] | Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	1,065	1,053
Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Net sales	57	64
Intersegment Eliminations [Member] | United States
Disaggregation of Revenue [Line Items]
Net sales	60	58
Intersegment Eliminations [Member] | EMEA
Disaggregation of Revenue [Line Items]
Net sales	(2)	(5)
Intersegment Eliminations [Member] | Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	4	16
Intersegment Eliminations [Member] | Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	(5)	(5)
Geography Eliminations [Member] | Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,832	3,827
Geography Eliminations [Member] | Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	689	677
Geography Eliminations [Member] | Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	1,065	1,053
Subsegments Consolidation Items [Domain]
Disaggregation of Revenue [Line Items]
Net sales	(39)	(63)
Subsegments Consolidation Items [Domain] | Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	(31)	(58)
Subsegments Consolidation Items [Domain] | Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	$ (8)	$ (5)