BUSINESS SEGMENTS - Sales and Contribution (Charge) to Earnings (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers	$ 1,636	$ 1,910	$ 2,065	$ 1,865	$ 1,823	$ 1,872	$ 1,808	$ 1,693	$ 7,476	$ 7,196	$ 6,365
Contribution (charge) to earnings from continuing operations									1,182	1,109	1,892
Timberlands
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers									1,915	1,942	1,805
Wood Products
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers									5,255	4,974	4,334
Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers											6,365
Intersegment sales									0	0	0
Contribution (charge) to earnings from continuing operations									1,182	1,109	935
Operating segments | RE & ENR
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers									306	280	226
Operating segments | Continuing operations | Timberlands
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers									1,915	1,942	1,805
Intersegment sales									802	762	840
Contribution (charge) to earnings from continuing operations									583	532	499
Operating segments | Continuing operations | RE & ENR
Segment Reporting, Revenue Reconciling Item [Line Items]
Intersegment sales									1	1	1
Contribution (charge) to earnings from continuing operations									127	146	55
Operating segments | Continuing operations | Wood Products
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers									5,255	4,974	4,334
Intersegment sales									0	0	68
Contribution (charge) to earnings from continuing operations									838	569	512
Intersegment eliminations | Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Intersegment sales									(803)	(763)	(909)
Unallocated Items | Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers									0	0	0
Contribution (charge) to earnings from continuing operations									$ (366)	$ (138)	$ (131)