Supplementary Financial Statement Information (Plants, Properties And Equipment By Major Classification) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Gross cost	$ 33,561	$ 33,814
Less: Accumulated depreciation	20,494	20,549
Plants, properties and equipment, net	13,067	13,265
Pulp, paper and packaging facilities
Property, Plant and Equipment [Line Items]
Gross cost	32,329	32,523
Other properties and equipment
Property, Plant and Equipment [Line Items]
Gross cost	$ 1,232	$ 1,291