REVENUE RECOGNITION Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 5,568	$ 5,901	$ 16,878	$ 17,355
North American Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,368	3,653	10,158	10,604
EMEA Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	324	311	994	1,017
Brazilian Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	61	57	176	175
European Coated Paperboard
Disaggregation of Revenue [Line Items]
Net sales	92	87	275	265
Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	624	714	1,974	2,083
North American Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	492	492	1,474	1,443
Brazilian Papers
Disaggregation of Revenue [Line Items]
Net sales	247	255	702	706
European Papers
Disaggregation of Revenue [Line Items]
Net sales	299	311	929	932
Indian Papers
Disaggregation of Revenue [Line Items]
Net sales	38	47	144	150
United States
Disaggregation of Revenue [Line Items]
Net sales	4,257	4,530	12,809	13,114
EMEA
Disaggregation of Revenue [Line Items]
Net sales	791	797	2,448	2,472
Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	97	143	337	470
Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	423	431	1,284	1,299
Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,820	4,034	11,516	11,883
Industrial Packaging | North American Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,368	3,653	10,158	10,604
Industrial Packaging | EMEA Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	324	311	994	1,017
Industrial Packaging | Brazilian Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	61	57	176	175
Industrial Packaging | European Coated Paperboard
Disaggregation of Revenue [Line Items]
Net sales	92	87	275	265
Industrial Packaging | United States
Disaggregation of Revenue [Line Items]
Net sales	3,180	3,394	9,531	9,832
Industrial Packaging | EMEA
Disaggregation of Revenue [Line Items]
Net sales	415	396	1,263	1,275
Industrial Packaging | Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	20	40	50	110
Industrial Packaging | Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	205	204	672	666
Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	624	714	1,974	2,083
Global Cellulose Fibers | Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	624	714	1,974	2,083
Global Cellulose Fibers | United States
Disaggregation of Revenue [Line Items]
Net sales	535	602	1,656	1,720
Global Cellulose Fibers | EMEA
Disaggregation of Revenue [Line Items]
Net sales	62	77	207	222
Global Cellulose Fibers | Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	27	35	111	140
Global Cellulose Fibers | Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	1
Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	1,071	1,102	3,224	3,215
Printing Papers | North American Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	492	492	1,474	1,443
Printing Papers | Brazilian Papers
Disaggregation of Revenue [Line Items]
Net sales	247	255	702	706
Printing Papers | European Papers
Disaggregation of Revenue [Line Items]
Net sales	299	311	929	932
Printing Papers | Indian Papers
Disaggregation of Revenue [Line Items]
Net sales	38	47	144	150
Printing Papers | United States
Disaggregation of Revenue [Line Items]
Net sales	486	482	1,448	1,399
Printing Papers | EMEA
Disaggregation of Revenue [Line Items]
Net sales	315	328	986	988
Printing Papers | Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	47	62	167	185
Printing Papers | Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	223	230	623	643
Operating Segments [Member] | Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,820	4,034	11,516	11,883
Operating Segments [Member] | Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	624	714	1,974	2,083
Operating Segments [Member] | Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	1,071	1,102	3,224	3,215
Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Net sales	53	51	164	174
Intersegment Eliminations [Member] | United States
Disaggregation of Revenue [Line Items]
Net sales	56	52	174	163
Intersegment Eliminations [Member] | EMEA
Disaggregation of Revenue [Line Items]
Net sales	(1)	(4)	(8)	(13)
Intersegment Eliminations [Member] | Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	3	6	9	35
Intersegment Eliminations [Member] | Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	(5)	(3)	(11)	(11)
Geography Eliminations [Member] | Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,820	4,034	11,516	11,883
Geography Eliminations [Member] | Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	624	714	1,974	2,083
Geography Eliminations [Member] | Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	1,071	1,102	3,224	3,215
Subsegments Consolidation Items [Domain]
Disaggregation of Revenue [Line Items]
Net sales	(30)	(77)	(112)	(194)
Subsegments Consolidation Items [Domain] | Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	(25)	(74)	(87)	(178)
Subsegments Consolidation Items [Domain] | Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	$ (5)	$ (3)	$ (25)	$ (16)