REVENUE RECOGNITION - Revenue by Major Products (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue from External Customer
Net sales	$ 2,345	$ 2,110	$ 7,995	$ 5,469
Timberlands
Revenue from External Customer
Net sales	423	345	1,207	1,085
Timberlands | Delivered logs
Revenue from External Customer
Net sales	392	317	1,116	992
Timberlands | Stumpage and pay-as-cut timber
Revenue from External Customer
Net sales	9	5	22	15
Timberlands | Recreational and other lease revenue
Revenue from External Customer
Net sales	16	16	48	47
Timberlands | Other
Revenue from External Customer
Net sales	6	7	21	31
Timberlands | West | Delivered logs
Revenue from External Customer
Net sales	226	163	649	519
Timberlands | South | Delivered logs
Revenue from External Customer
Net sales	153	141	429	436
Timberlands | North | Delivered logs
Revenue from External Customer
Net sales	13	13	38	37
Timberlands | Domestic grade sales | West | Delivered logs
Revenue from External Customer
Net sales	76	80	235	238
Timberlands | Export grade sales | West | Delivered logs
Revenue from External Customer
Net sales	150	83	414	281
Real Estate & ENR
Revenue from External Customer
Net sales	69	69	285	246
Real Estate & ENR | Real Estate
Revenue from External Customer
Net sales	45	49	212	192
Real Estate & ENR | Energy and natural resources
Revenue from External Customer
Net sales	24	20	73	54
Wood Products
Revenue from External Customer
Net sales	1,853	1,696	6,503	4,138
Wood Products | Structural lumber
Revenue from External Customer
Net sales	681	819	3,020	1,865
Wood Products | Oriented strand board
Revenue from External Customer
Net sales	470	290	1,513	659
Wood Products | Engineered solid section
Revenue from External Customer
Net sales	183	135	491	373
Wood Products | Engineered I-joists
Revenue from External Customer
Net sales	128	83	315	231
Wood Products | Softwood plywood
Revenue from External Customer
Net sales	45	55	170	128
Wood Products | Medium density fiberboard
Revenue from External Customer
Net sales	52	47	143	124
Wood Products | Complementary building products
Revenue from External Customer
Net sales	211	183	595	505
Wood Products | Other
Revenue from External Customer
Net sales	$ 83	$ 84	$ 256	$ 253