Financial Information By Industry Segment And Geographic Area (Information By Industry Segment, External Sales By Major Product) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net Sales		$ 23,306	$ 21,743	$ 19,495
Operating Segments [Member] | Industrial Packaging
Segment Reporting Information [Line Items]
Net Sales		15,828	14,946	14,142
Operating Segments [Member] | Global Cellulose Fibers
Segment Reporting Information [Line Items]
Net Sales		2,810	2,524	1,090
Operating Segments [Member] | Printing Papers
Segment Reporting Information [Line Items]
Net Sales		4,359	4,142	4,062
Corporate and other | Corporate and Other
Segment Reporting Information [Line Items]
Net Sales	[1]	$ 309	$ 131	$ 201

[1] Includes $0 million in 2018, $15 million in 2017, and $42 million in 2016, from previously divested businesses.