REVENUE RECOGNITION Revenue by Major Products (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue from External Customer
Net sales	$ 1,692	$ 2,065	$ 3,335	$ 3,930
Timberlands
Revenue from External Customer
Net sales	401	476	832	966
Timberlands | Delivered logs
Revenue from External Customer
Net sales	367	440	760	888
Timberlands | Stumpage and pay-as-cut timber
Revenue from External Customer
Net sales	10	11	19	26
Timberlands | Recreational and other lease revenue
Revenue from External Customer
Net sales	15	14	30	28
Timberlands | Other
Revenue from External Customer
Net sales	9	11	23	24
Timberlands | West | Delivered logs
Revenue from External Customer
Net sales	194	262	399	528
Timberlands | South | Delivered logs
Revenue from External Customer
Net sales	156	158	315	315
Timberlands | North | Delivered logs
Revenue from External Customer
Net sales	17	20	46	45
Timberlands | Domestic grade sales | West | Delivered logs
Revenue from External Customer
Net sales	104	136	205	273
Timberlands | Export grade sales | West | Delivered logs
Revenue from External Customer
Net sales	90	126	194	255
Real Estate & ENR
Revenue from External Customer
Net sales	81	58	199	109
Real Estate & ENR | Real Estate
Revenue from External Customer
Net sales	59	38	155	72
Real Estate & ENR | Energy and natural resources
Revenue from External Customer
Net sales	22	20	44	37
Wood Products
Revenue from External Customer
Net sales	1,210	1,531	2,304	2,855
Wood Products | Structural lumber
Revenue from External Customer
Net sales	495	681	939	1,250
Wood Products | Oriented strand board
Revenue from External Customer
Net sales	156	277	316	509
Wood Products | Engineered solid section
Revenue from External Customer
Net sales	134	139	250	268
Wood Products | Engineered I-joists
Revenue from External Customer
Net sales	86	92	156	170
Wood Products | Softwood plywood
Revenue from External Customer
Net sales	44	55	88	105
Wood Products | Medium density fiberboard
Revenue from External Customer
Net sales	45	47	83	90
Wood Products | Complementary building products
Revenue from External Customer
Net sales	167	160	304	297
Wood Products | Other
Revenue from External Customer
Net sales	$ 83	$ 80	$ 168	$ 166