BUSINESS SEGMENTS - Reconciliation of Business Segment Information in Consolidated Statement of Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	$ 2,110	$ 1,671	$ 5,469	$ 5,006
Net contribution (charge) to earnings	503	193	970	89
Interest expense, net of capitalized interest	(111)	(91)	(299)	(289)
Earnings (loss) before income taxes	392	102	671	(200)
Income taxes	(109)	(3)	(166)	138
Net earnings (loss)	283	99	505	(62)
Operating Segments
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	2,217	1,796	5,819	5,387
Net contribution (charge) to earnings	572	247	1,100	709
Intersegment eliminations
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	(107)	(125)	(350)	(381)
Unallocated items
Segment Reporting, Revenue Reconciling Item
Net contribution (charge) to earnings	(69)	(54)	(130)	(620)
Timberlands
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	345	398	1,085	1,230
Timberlands | Operating Segments
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	345	398	1,085	1,230
Net contribution (charge) to earnings	(11)	72	169	294
Timberlands | Intersegment eliminations
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	107	125	350	381
Real Estate & ENR
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	69	69	246	268
Real Estate & ENR | Operating Segments
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	69	69	246	268
Net contribution (charge) to earnings	17	32	72	122
Wood Products
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	1,696	1,204	4,138	3,508
Wood Products | Operating Segments
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	1,696	1,204	4,138	3,508
Net contribution (charge) to earnings	$ 566	$ 143	$ 859	$ 293