BUSINESS SEGMENTS - Reconciliation of Business Segment Information in Consolidated Statement of Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	$ 2,345	$ 2,110	$ 7,995	$ 5,469
Net contribution (charge) to earnings	645	503	3,024	970
Interest expense, net of capitalized interest	(79)	(111)	(236)	(299)
Earnings before income taxes	566	392	2,788	671
Income taxes	(84)	(109)	(597)	(166)
Net earnings	482	283	2,191	505
Operating Segments
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	2,474	2,217	8,394	5,819
Net contribution (charge) to earnings	695	572	3,223	1,100
Intersegment eliminations
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	(129)	(107)	(399)	(350)
Unallocated items
Segment Reporting, Revenue Reconciling Item
Net contribution (charge) to earnings	(50)	(69)	(199)	(130)
Timberlands
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	423	345	1,207	1,085
Timberlands | Operating Segments
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	423	345	1,207	1,085
Net contribution (charge) to earnings	133	(11)	354	169
Timberlands | Intersegment eliminations
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	129	107	399	350
Real Estate & ENR
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	69	69	285	246
Real Estate & ENR | Operating Segments
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	69	69	285	246
Net contribution (charge) to earnings	45	17	174	72
Wood Products
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	1,853	1,696	6,503	4,138
Wood Products | Operating Segments
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	1,853	1,696	6,503	4,138
Net contribution (charge) to earnings	$ 517	$ 566	$ 2,695	$ 859