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, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net Sales		$ 21,743	$ 19,495	$ 20,675
Operating Segments [Member] | Industrial Packaging
Segment Reporting Information [Line Items]
Net Sales		14,946	14,142	14,496
Operating Segments [Member] | Global Cellulose Fibers
Segment Reporting Information [Line Items]
Net Sales		2,524	1,090	986
Operating Segments [Member] | Printing Papers
Segment Reporting Information [Line Items]
Net Sales		4,142	4,062	4,082
Corporate and other (c) | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net Sales	[1]	$ 131	$ 201	$ 1,111

[1] Includes $15 million in 2017, $42 million in 2016, and $930 million in 2015 from previously divested businesses.