REVENUE RECOGNITION - Revenue by Major Products (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue from External Customer
Net sales	$ 2,110	$ 1,671	$ 5,469	$ 5,006
Timberlands
Revenue from External Customer
Net sales	345	398	1,085	1,230
Timberlands | Delivered logs
Revenue from External Customer
Net sales	317	364	992	1,124
Timberlands | Stumpage and pay-as-cut timber
Revenue from External Customer
Net sales	5	10	15	29
Timberlands | Recreational and other lease revenue
Revenue from External Customer
Net sales	16	15	47	45
Timberlands | Other
Revenue from External Customer
Net sales	7	9	31	32
Timberlands | West | Delivered logs
Revenue from External Customer
Net sales	163	172	519	571
Timberlands | South | Delivered logs
Revenue from External Customer
Net sales	141	168	436	483
Timberlands | North | Delivered logs
Revenue from External Customer
Net sales	13	24	37	70
Timberlands | Domestic grade sales | West | Delivered logs
Revenue from External Customer
Net sales	80	86	238	291
Timberlands | Export grade sales | West | Delivered logs
Revenue from External Customer
Net sales	83	86	281	280
Real Estate & ENR
Revenue from External Customer
Net sales	69	69	246	268
Real Estate & ENR | Real Estate
Revenue from External Customer
Net sales	49	45	192	200
Real Estate & ENR | Energy and natural resources
Revenue from External Customer
Net sales	20	24	54	68
Wood Products
Revenue from External Customer
Net sales	1,696	1,204	4,138	3,508
Wood Products | Structural lumber
Revenue from External Customer
Net sales	819	487	1,865	1,426
Wood Products | Oriented strand board
Revenue from External Customer
Net sales	290	159	659	475
Wood Products | Engineered solid section
Revenue from External Customer
Net sales	135	138	373	388
Wood Products | Engineered I-joists
Revenue from External Customer
Net sales	83	90	231	246
Wood Products | Softwood plywood
Revenue from External Customer
Net sales	55	42	128	130
Wood Products | Medium density fiberboard
Revenue from External Customer
Net sales	47	44	124	127
Wood Products | Complementary building products
Revenue from External Customer
Net sales	183	162	505	466
Wood Products | Other
Revenue from External Customer
Net sales	$ 84	$ 82	$ 253	$ 250