BUSINESS SEGMENTS - Reconciliation of Business Segment Information in Consolidated Statement of Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	$ 2,506	$ 1,728
Net contribution (charge) to earnings	949	232
Interest expense, net of capitalized interest	(79)	(85)
Earnings before income taxes	870	147
Income taxes	(189)	3
Net earnings	681	150
Operating Segments
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	2,640	1,850
Net contribution (charge) to earnings	1,014	275
Intersegment eliminations
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	(134)	(122)
Unallocated items
Segment Reporting, Revenue Reconciling Item
Net contribution (charge) to earnings	(65)	(43)
Timberlands
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	379	381
Timberlands | Operating Segments
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	379	381
Net contribution (charge) to earnings	108	105
Timberlands | Intersegment eliminations
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	134	122
Real Estate & ENR
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	106	112
Real Estate & ENR | Operating Segments
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	106	112
Net contribution (charge) to earnings	66	36
Wood Products
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	2,021	1,235
Wood Products | Operating Segments
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	2,021	1,235
Net contribution (charge) to earnings	$ 840	$ 134