INDUSTRY SEGMENT INFORMATION Sales 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 Information [Line Items]
Net sales	$ 5,123	$ 5,568	$ 15,341	$ 16,878
Consolidation, Eliminations
Segment Reporting Information [Line Items]
Net sales	48	53	150	164
Industrial Packaging
Segment Reporting Information [Line Items]
Net sales	3,768	3,820	11,220	11,516
Global Cellulose Fibers
Segment Reporting Information [Line Items]
Net sales	564	624	1,737	1,974
Printing Papers
Segment Reporting Information [Line Items]
Net sales	$ 743	$ 1,071	$ 2,234	$ 3,224