(Depreciation, Amortization And Cost of Timber Harvested) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Depreciation and Amortization		$ 1,306	$ 1,328	$ 1,343
Operating Segments [Member] | Industrial Packaging
Segment Reporting Information [Line Items]
Depreciation and Amortization		794	803	815
Operating Segments [Member] | Global Cellulose Fibers
Segment Reporting Information [Line Items]
Depreciation and Amortization		263	262	264
Operating Segments [Member] | Printing Papers
Segment Reporting Information [Line Items]
Depreciation and Amortization		244	258	254
Corporate and other
Segment Reporting Information [Line Items]
Depreciation and Amortization	[1]	$ 5	$ 5	$ 10

[1] Includes $1 million in 2017 from previously divested businesses.