Financial Information By Industry Segment And Geographic Area (Information By Industry Segment, Capital Spending) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Capital Spending		$ 1,572	$ 1,280	$ 1,241
Subtotal
Segment Reporting Information [Line Items]
Capital Spending		1,547	1,259	1,221
Subtotal | Industrial Packaging
Segment Reporting Information [Line Items]
Capital Spending		1,061	836	832
Subtotal | Global Cellulose Fibers
Segment Reporting Information [Line Items]
Capital Spending		183	188	174
Subtotal | Printing Papers
Segment Reporting Information [Line Items]
Capital Spending		303	235	215
Corporate and other
Segment Reporting Information [Line Items]
Capital Spending	[1]	$ 25	$ 21	$ 20

[1] Includes corporate assets and assets of previously divested businesses of $0 million in 2018, $0 million in 2017 and $1 million in 2016.