BUSINESS SEGMENTS - Reconciliation of Business Segment Information in Consolidated Statement of Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	$ 3,144	$ 1,631	$ 5,650	$ 3,359
Net contribution (charge) to earnings	1,430	235	2,379	467
Interest expense, net of capitalized interest	(78)	(103)	(157)	(188)
Earnings before income taxes	1,352	132	2,222	279
Income taxes	(324)	(60)	(513)	(57)
Net earnings	1,028	72	1,709	222
Operating Segments
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	3,280	1,752	5,920	3,602
Net contribution (charge) to earnings	1,514	253	2,528	528
Intersegment eliminations
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	(136)	(121)	(270)	(243)
Unallocated items
Segment Reporting, Revenue Reconciling Item
Net contribution (charge) to earnings	(84)	(18)	(149)	(61)
Timberlands
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	405	359	784	740
Timberlands | Operating Segments
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	405	359	784	740
Net contribution (charge) to earnings	113	75	221	180
Timberlands | Intersegment eliminations
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	136	121	270	243
Real Estate & ENR
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	110	65	216	177
Real Estate & ENR | Operating Segments
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	110	65	216	177
Net contribution (charge) to earnings	63	19	129	55
Wood Products
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	2,629	1,207	4,650	2,442
Wood Products | Operating Segments
Segment Reporting, Revenue Reconciling Item
Sales to unaffiliated customers	2,629	1,207	4,650	2,442
Net contribution (charge) to earnings	$ 1,338	$ 159	$ 2,178	$ 293