(Operating Profit By Industry Segment) (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Earnings (loss) from continuing operations before income taxes and equity earnings		$ 123	$ 282	$ 261	$ (16)	$ 400	$ 452	$ 334	$ 418	$ 650	$ 1,604	$ 1,781
Interest expense, net										444	491	536
Noncontrolling interests adjustment (a)	[1]									0	3	(10)
Nonoperating Income (Expense)										(7)
Corporate expenses, net											54	67
Corporate net special items										274	104	9
Business net special items										490	307	205
Non-operating pension (income) expense		$ (10)	$ (11)	$ (14)	$ (6)	$ (9)	$ (9)	$ (8)	$ (10)	(41)	36	494
Operating Segments [Member]
Segment Reporting Information [Line Items]
Business Segment Operating Profit										1,810	2,599	3,082
Operating Segments [Member] | Industrial Packaging
Segment Reporting Information [Line Items]
Business Segment Operating Profit										1,819	2,076	2,277
Business net special items										475	78	184
Operating Segments [Member] | Global Cellulose Fibers
Segment Reporting Information [Line Items]
Business Segment Operating Profit										(237)	(6)	262
Business net special items										5	68	11
Operating Segments [Member] | Printing Papers
Segment Reporting Information [Line Items]
Business Segment Operating Profit										228	529	543
Business net special items										$ 10	$ 161	$ 10

[1] Operating profits for industry segments include each segment’s percentage share of the profits of subsidiaries included in that segment that are less than wholly-owned. The pre-tax noncontrolling interests for these subsidiaries is added here to present consolidated earnings from continuing operations before income taxes and equity earnings.