(Business Special Items By Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Business special items, net	$ 307	$ 205	$ 425
Industrial Packaging | Operating Segments [Member]
Segment Reporting Information [Line Items]
Business special items, net	78	184	372
Global Cellulose Fibers | Operating Segments [Member]
Segment Reporting Information [Line Items]
Business special items, net	68	11	51
Printing Papers | Operating Segments [Member]
Segment Reporting Information [Line Items]
Business special items, net	$ 161	$ 10	$ 2