(Information By Industry Segment, Capital Spending) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Capital Spending		$ 480	$ 663	$ 1,137
Subtotal
Segment Reporting Information [Line Items]
Capital Spending		465	650	1,114
Subtotal | Industrial Packaging
Segment Reporting Information [Line Items]
Capital Spending		382	554	951
Subtotal | Global Cellulose Fibers
Segment Reporting Information [Line Items]
Capital Spending		83	96	163
Corporate and other
Segment Reporting Information [Line Items]
Capital Spending	[1]	$ 15	$ 13	$ 23

[1] Includes corporate assets and assets of previously divested businesses of $0 million in 2021, $0 million in 2020 and $4 million in 2019.