REVENUE RECOGNITION Revenue by Major Products (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue from External Customer
Net sales	$ 1,548	$ 1,671	$ 1,692	$ 1,643	$ 1,636	$ 1,910	$ 2,065	$ 1,865	$ 6,554	$ 7,476	$ 7,196
Timberlands
Revenue from External Customer
Net sales									1,618	1,873	1,893
Timberlands | Delivered logs
Revenue from External Customer
Net sales									1,472	1,711	1,649
Timberlands | Stumpage and pay-as-cut timber
Revenue from External Customer
Net sales									42	59	73
Timberlands | Recreational and other lease revenue
Revenue from External Customer
Net sales									61	59	59
Timberlands | Other
Revenue from External Customer
Net sales									43	44	112
Timberlands | West | Delivered logs
Revenue from External Customer
Net sales									740	987	915
Timberlands | South | Delivered logs
Revenue from External Customer
Net sales									640	625	616
Timberlands | North | Delivered logs
Revenue from External Customer
Net sales									92	99	95
Timberlands | Other | Delivered logs
Revenue from External Customer
Net sales									0	0	23
Timberlands | Domestic grade sales | West | Delivered logs
Revenue from External Customer
Net sales									375	503	473
Timberlands | Export grade sales | West | Delivered logs
Revenue from External Customer
Net sales									365	484	442
RE & ENR
Revenue from External Customer
Net sales									313	306	280
RE & ENR | Real Estate
Revenue from External Customer
Net sales									225	229	208
RE & ENR | Energy and natural resources
Revenue from External Customer
Net sales									88	77	72
Wood Products
Revenue from External Customer
Net sales									4,623	5,297	5,023
Wood Products | Structural lumber
Revenue from External Customer
Net sales									1,892	2,258	2,058
Wood Products | Oriented strand board
Revenue from External Customer
Net sales									632	891	904
Wood Products | Engineered solid section
Revenue from External Customer
Net sales									510	521	500
Wood Products | Engineered I-joists
Revenue from External Customer
Net sales									323	336	336
Wood Products | Softwood plywood
Revenue from External Customer
Net sales									161	200	176
Wood Products | Medium density fiberboard
Revenue from External Customer
Net sales									166	177	183
Wood Products | Complementary building products
Revenue from External Customer
Net sales									602	584	541
Wood Products | Other
Revenue from External Customer
Net sales									$ 337	$ 330	$ 325