BUSINESS SEGMENTS - Reconciliation of Business Segment Information in Consolidated Statement of Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting, Revenue Reconciling Item
Net sales to unaffiliated customers	$ 1,717	$ 1,681	$ 5,364	$ 5,416
Total sales	1,717	1,681	5,364	5,416
Net contribution (charge) to earnings	110	82	440	556
Costs of sales	1,513	1,431	4,500	4,407
Gross margin	204	250	864	1,009
Selling expenses	23	22	69	66
General and administrative expenses	107	122	340	358
Other segment items	(36)	24	15	29
Intersegment eliminations
Segment Reporting, Revenue Reconciling Item
Total sales	(150)	(136)	(458)	(416)
Unallocated items
Segment Reporting, Revenue Reconciling Item
Net sales to unaffiliated customers	0	0	0	0
Total sales	(150)	(136)	(458)	(416)
Net contribution (charge) to earnings	(20)	(53)	(194)	(183)
Costs of sales	(162)	(142)	(433)	(410)
Gross margin	12	6	(25)	(6)
Selling expenses	0	0	1	1
General and administrative expenses	36	51	129	146
Other segment items	(4)	8	39	30
Timberlands
Segment Reporting, Revenue Reconciling Item
Total sales	386	357	1,141	1,153
Timberlands | Operating Segments
Segment Reporting, Revenue Reconciling Item
Net sales to unaffiliated customers	386	357	1,141	1,153
Total sales	536	493	1,599	1,569
Net contribution (charge) to earnings	80	57	270	218
Costs of sales	429	410	1,254	1,275
Gross margin	107	83	345	294
Selling expenses	0	1	1	1
General and administrative expenses	25	24	73	74
Other segment items	2	1	1	1
Timberlands | Intersegment eliminations
Segment Reporting, Revenue Reconciling Item
Total sales	150	136	458	416
Real Estate & ENR
Segment Reporting, Revenue Reconciling Item
Total sales	103	89	351	305
Real Estate & ENR | Operating Segments
Segment Reporting, Revenue Reconciling Item
Net sales to unaffiliated customers	103	89	351	305
Total sales	103	89	351	305
Net contribution (charge) to earnings	69	51	231	170
Costs of sales	28	31	104	118
Gross margin	75	58	247	187
Selling expenses	0	0	0	0
General and administrative expenses	7	6	20	20
Other segment items	(1)	1	(4)	(3)
Real Estate & ENR | Intersegment eliminations
Segment Reporting, Revenue Reconciling Item
Total sales	0	0	0	0
Wood Products
Segment Reporting, Revenue Reconciling Item
Total sales	1,228	1,235	3,872	3,958
Wood Products | Operating Segments
Segment Reporting, Revenue Reconciling Item
Net sales to unaffiliated customers	1,228	1,235	3,872	3,958
Total sales	1,228	1,235	3,872	3,958
Net contribution (charge) to earnings	(19)	27	133	351
Costs of sales	1,218	1,132	3,575	3,424
Gross margin	10	103	297	534
Selling expenses	23	21	67	64
General and administrative expenses	39	41	118	118
Other segment items	(33)	14	(21)	1
Wood Products | Intersegment eliminations
Segment Reporting, Revenue Reconciling Item
Total sales	$ 0	$ 0	$ 0	$ 0