INDUSTRY SEGMENT INFORMATION Operating Profit by Industry Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating profit	$ 473	$ 701	$ 1,413	$ 1,930
Earnings (loss) before income taxes and equity earnings	282	452	527	1,204
Interest expense, net	112	123	345	378
Noncontrolling interests adjustment	0	2	0	4
Corporate expenses, net	(20)	21	9	45
Corporate net special items	108	48	195	48
Business net special items	2	46	368	224
Non-operating pension expense (income)	(11)	9	(31)	27
Industrial Packaging
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating profit	469	535	1,388	1,471
Global Cellulose Fibers
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating profit	(59)	4	(123)	39
Printing Papers
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating profit	$ 63	$ 162	$ 148	$ 420