(Depreciation, Amortization And Cost of Timber Harvested) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Depreciation and Amortization	$ 1,287	$ 1,306	$ 1,328
Operating Segments [Member] | Industrial Packaging
Segment Reporting Information [Line Items]
Depreciation and Amortization	826	794	803
Operating Segments [Member] | Global Cellulose Fibers
Segment Reporting Information [Line Items]
Depreciation and Amortization	271	263	262
Operating Segments [Member] | Printing Papers
Segment Reporting Information [Line Items]
Depreciation and Amortization	186	244	258
Corporate and other
Segment Reporting Information [Line Items]
Depreciation and Amortization	$ 4	$ 5	$ 5