REVENUE RECOGNITION Revenue by Major Products (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue from External Customer
Net sales	$ 1,631	$ 1,692	$ 3,359	$ 3,335
Timberlands
Revenue from External Customer
Net sales	359	401	740	832
Timberlands | Delivered logs
Revenue from External Customer
Net sales	331	367	675	760
Timberlands | Stumpage and pay-as-cut timber
Revenue from External Customer
Net sales	5	10	10	19
Timberlands | Recreational and other lease revenue
Revenue from External Customer
Net sales	16	15	31	30
Timberlands | Other
Revenue from External Customer
Net sales	7	9	24	23
Timberlands | West | Delivered logs
Revenue from External Customer
Net sales	179	194	356	399
Timberlands | South | Delivered logs
Revenue from External Customer
Net sales	145	156	295	315
Timberlands | North | Delivered logs
Revenue from External Customer
Net sales	7	17	24	46
Timberlands | Domestic grade sales | West | Delivered logs
Revenue from External Customer
Net sales	71	104	158	205
Timberlands | Export grade sales | West | Delivered logs
Revenue from External Customer
Net sales	108	90	198	194
Real Estate & ENR
Revenue from External Customer
Net sales	65	81	177	199
Real Estate & ENR | Real Estate
Revenue from External Customer
Net sales	48	59	143	155
Real Estate & ENR | Energy and natural resources
Revenue from External Customer
Net sales	17	22	34	44
Wood Products
Revenue from External Customer
Net sales	1,207	1,210	2,442	2,304
Wood Products | Structural lumber
Revenue from External Customer
Net sales	538	495	1,046	939
Wood Products | Oriented strand board
Revenue from External Customer
Net sales	179	156	369	316
Wood Products | Engineered solid section
Revenue from External Customer
Net sales	111	134	238	250
Wood Products | Engineered I-joists
Revenue from External Customer
Net sales	70	86	148	156
Wood Products | Softwood plywood
Revenue from External Customer
Net sales	34	44	73	88
Wood Products | Medium density fiberboard
Revenue from External Customer
Net sales	33	45	77	83
Wood Products | Complementary building products
Revenue from External Customer
Net sales	169	167	322	304
Wood Products | Other
Revenue from External Customer
Net sales	$ 73	$ 83	$ 169	$ 168