REVENUE RECOGNITION Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 5,123	$ 5,568	$ 15,341	$ 16,878
North American Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,351	3,368	9,947	10,158
EMEA Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	306	324	953	994
Brazilian Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	52	61	148	176
European Coated Paperboard
Disaggregation of Revenue [Line Items]
Net sales	90	92	266	275
Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	564	624	1,737	1,974
North American Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	362	492	1,073	1,474
Brazilian Papers
Disaggregation of Revenue [Line Items]
Net sales	150	247	434	702
European Papers
Disaggregation of Revenue [Line Items]
Net sales	232	299	728	929
Indian Papers
Disaggregation of Revenue [Line Items]
Net sales	0	38	0	144
United States
Disaggregation of Revenue [Line Items]
Net sales	4,054	4,257	12,086	12,809
EMEA
Disaggregation of Revenue [Line Items]
Net sales	694	791	2,142	2,448
Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	57	97	138	337
Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	318	423	975	1,284
Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,768	3,820	11,220	11,516
Industrial Packaging | North American Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,351	3,368	9,947	10,158
Industrial Packaging | EMEA Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	306	324	953	994
Industrial Packaging | Brazilian Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	52	61	148	176
Industrial Packaging | European Coated Paperboard
Disaggregation of Revenue [Line Items]
Net sales	90	92	266	275
Industrial Packaging | United States
Disaggregation of Revenue [Line Items]
Net sales	3,169	3,180	9,364	9,531
Industrial Packaging | EMEA
Disaggregation of Revenue [Line Items]
Net sales	394	415	1,213	1,263
Industrial Packaging | Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	15	20	43	50
Industrial Packaging | Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	190	205	600	672
Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	564	624	1,737	1,974
Global Cellulose Fibers | Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	564	624	1,737	1,974
Global Cellulose Fibers | United States
Disaggregation of Revenue [Line Items]
Net sales	479	535	1,507	1,656
Global Cellulose Fibers | EMEA
Disaggregation of Revenue [Line Items]
Net sales	59	62	175	207
Global Cellulose Fibers | Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	26	27	55	111
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	743	1,071	2,234	3,224
Printing Papers | North American Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	362	492	1,073	1,474
Printing Papers | Brazilian Papers
Disaggregation of Revenue [Line Items]
Net sales	150	247	434	702
Printing Papers | European Papers
Disaggregation of Revenue [Line Items]
Net sales	232	299	728	929
Printing Papers | Indian Papers
Disaggregation of Revenue [Line Items]
Net sales	0	38	0	144
Printing Papers | United States
Disaggregation of Revenue [Line Items]
Net sales	362	486	1,069	1,448
Printing Papers | EMEA
Disaggregation of Revenue [Line Items]
Net sales	244	315	765	986
Printing Papers | Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	6	47	20	167
Printing Papers | Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	131	223	380	623
Operating Segments [Member] | Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,768	3,820	11,220	11,516
Operating Segments [Member] | Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	564	624	1,737	1,974
Operating Segments [Member] | Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	743	1,071	2,234	3,224
Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Net sales	(32)	(30)	(95)	(112)
Intersegment Eliminations [Member] | Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	(31)	(25)	(94)	(87)
Intersegment Eliminations [Member] | Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	(1)	(5)	(1)	(25)
Geography Eliminations [Member] | Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	3,768	3,820	11,220	11,516
Geography Eliminations [Member] | Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	564	624	1,737	1,974
Geography Eliminations [Member] | Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	743	1,071	2,234	3,224
Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Net sales	48	53	150	164
Consolidation, Eliminations | United States
Disaggregation of Revenue [Line Items]
Net sales	44	56	146	174
Consolidation, Eliminations | EMEA
Disaggregation of Revenue [Line Items]
Net sales	(3)	(1)	(11)	(8)
Consolidation, Eliminations | Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	10	3	20	9
Consolidation, Eliminations | Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	$ (3)	$ (5)	$ (5)	$ (11)