(Plants, Properties And Equipment By Major Classification) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Gross cost	$ 33,595	$ 33,516
Less: Accumulated depreciation	21,378	20,512
Plants, properties and equipment, net	12,217	13,004
Pulp, paper and packaging facilities
Property, Plant and Equipment [Line Items]
Gross cost	32,439	32,292
Other properties and equipment
Property, Plant and Equipment [Line Items]
Gross cost	$ 1,156	$ 1,224