(Sales By Industry Segment) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Segment Reporting Information [Line Items]
NET SALES	$ 5,239	$ 5,123	$ 4,866	$ 5,352	$ 5,498	$ 5,568	$ 5,667	$ 5,643	$ 20,580	[1]	$ 22,376	[1]	$ 23,306	[1]
Operating Segments [Member] | Industrial Packaging
Segment Reporting Information [Line Items]
NET SALES									15,033		15,326		15,900
Operating Segments [Member] | Global Cellulose Fibers
Segment Reporting Information [Line Items]
NET SALES									2,319		2,551		2,819
Operating Segments [Member] | Printing Papers
Segment Reporting Information [Line Items]
NET SALES									3,036		4,291		4,375
Corporate & Intersegment
Segment Reporting Information [Line Items]
NET SALES									$ 192		$ 208		$ 212

[1] Net sales are attributed to countries based on the location of the seller.