BUSINESS SEGMENTS Reconciliation of Business Segment Information in Consolidated Statement of Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	$ 1,631	$ 1,692	$ 3,359	$ 3,335
Net contribution (charge) to earnings	235	182	467	(104)
Interest expense, net of capitalized interest	(103)	(91)	(188)	(198)
Earnings (loss) before income taxes	132	91	279	(302)
Income taxes	(60)	37	(57)	141
Net earnings (loss)	72	128	222	(161)
Operating Segments
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	1,752	1,823	3,602	3,591
Net contribution (charge) to earnings	253	218	528	462
Intersegment eliminations
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	(121)	(131)	(243)	(256)
Unallocated items
Segment Reporting, Revenue Reconciling Item
Net contribution (charge) to earnings	(18)	(36)	(61)	(566)
Timberlands
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	359	401	740	832
Timberlands | Operating Segments
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	359	401	740	832
Net contribution (charge) to earnings	75	102	180	222
Timberlands | Intersegment eliminations
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	121	131	243	256
Real Estate & ENR
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	65	81	177	199
Real Estate & ENR | Operating Segments
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	65	81	177	199
Net contribution (charge) to earnings	19	35	55	90
Wood Products
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	1,207	1,210	2,442	2,304
Wood Products | Operating Segments
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	1,207	1,210	2,442	2,304
Net contribution (charge) to earnings	$ 159	$ 81	$ 293	$ 150