Revenue Recognition Disaggregaton of Revenue Table (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Net sales	[1]	$ 20,580	$ 22,376	$ 23,306
Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Net sales	[1]	192	208	212
Corporate and other
Disaggregation of Revenue [Line Items]
Net sales		(124)	(160)	(246)
North American Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales		13,318	13,509	14,187
EMEA Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales		1,317	1,335	1,355
Brazilian Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales		148	235	232
European Coated Paperboard
Disaggregation of Revenue [Line Items]
Net sales		366	365	359
Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales		2,319	2,551	2,819
North American Printing Papers
Disaggregation of Revenue [Line Items]
Net sales		1,436	1,956	1,956
Brazilian Papers
Disaggregation of Revenue [Line Items]
Net sales		632	967	978
European Papers
Disaggregation of Revenue [Line Items]
Net sales		976	1,250	1,252
Indian Papers
Disaggregation of Revenue [Line Items]
Net sales			160	202
Industrial Packaging | Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Net sales		15,033	15,326	15,900
Industrial Packaging | Reportable Geographical Components [Member]
Disaggregation of Revenue [Line Items]
Net sales	[1]	15,033	15,326	15,900
Industrial Packaging | Corporate and other
Disaggregation of Revenue [Line Items]
Net sales		(116)	(118)	(233)
Industrial Packaging | North American Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales		13,318	13,509	14,187
Industrial Packaging | EMEA Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales		1,317	1,335	1,355
Industrial Packaging | Brazilian Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales		148	235	232
Industrial Packaging | European Coated Paperboard
Disaggregation of Revenue [Line Items]
Net sales		366	365	359
Global Cellulose Fibers | Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Net sales		2,319	2,551	2,819
Global Cellulose Fibers | Reportable Geographical Components [Member]
Disaggregation of Revenue [Line Items]
Net sales	[1]	2,319	2,551	2,819
Global Cellulose Fibers | Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales		2,319	2,551	2,819
Printing Papers | Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Net sales		3,036	4,291	4,375
Printing Papers | Reportable Geographical Components [Member]
Disaggregation of Revenue [Line Items]
Net sales	[1]	3,036	4,291	4,375
Printing Papers | Corporate and other
Disaggregation of Revenue [Line Items]
Net sales		(8)	(42)	(13)
Printing Papers | North American Printing Papers
Disaggregation of Revenue [Line Items]
Net sales		1,436	1,956	1,956
Printing Papers | Brazilian Papers
Disaggregation of Revenue [Line Items]
Net sales		632	967	978
Printing Papers | European Papers
Disaggregation of Revenue [Line Items]
Net sales		976	1,250	1,252
Printing Papers | Indian Papers
Disaggregation of Revenue [Line Items]
Net sales			160	202
United States
Disaggregation of Revenue [Line Items]
Net sales	[1]	16,147	16,948	17,609
United States | Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Net sales	[1]	192	220	203
United States | Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	[1]	12,537	12,668	13,167
United States | Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	[1]	1,993	2,148	2,336
United States | Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	[1]	1,425	1,912	1,903
EMEA
Disaggregation of Revenue [Line Items]
Net sales	[1]	2,920	3,258	3,321
EMEA | Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Net sales	[1]	(15)	(11)	(17)
EMEA | Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	[1]	1,675	1,692	1,704
EMEA | Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	[1]	235	254	304
EMEA | Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	[1]	1,025	1,323	1,330
Pacific Rim and Asia
Disaggregation of Revenue [Line Items]
Net sales	[1]	202	415	605
Pacific Rim and Asia | Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Net sales	[1]	28	12	39
Pacific Rim and Asia | Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	[1]	57	65	142
Pacific Rim and Asia | Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	[1]	91	149	179
Pacific Rim and Asia | Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	[1]	26	189	245
Americas, other than U.S.
Disaggregation of Revenue [Line Items]
Net sales	[1]	1,311	1,755	1,771
Americas, other than U.S. | Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Net sales	[1]	(13)	(13)	(13)
Americas, other than U.S. | Industrial Packaging
Disaggregation of Revenue [Line Items]
Net sales	[1]	764	901	887
Americas, other than U.S. | Global Cellulose Fibers
Disaggregation of Revenue [Line Items]
Net sales	[1]	0	0	0
Americas, other than U.S. | Printing Papers
Disaggregation of Revenue [Line Items]
Net sales	[1]	$ 560	$ 867	$ 897

[1] Net sales are attributed to countries based on the location of the reportable segment making the sale.