REVENUE RECOGNITION Revenue by Major Products (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue from External Customer
Net sales	$ 1,728	$ 1,643
Timberlands
Revenue from External Customer
Net sales	381	431
Timberlands | Delivered logs
Revenue from External Customer
Net sales	344	393
Timberlands | Stumpage and pay-as-cut timber
Revenue from External Customer
Net sales	5	9
Timberlands | Recreational and other lease revenue
Revenue from External Customer
Net sales	15	15
Timberlands | Other
Revenue from External Customer
Net sales	17	14
Timberlands | West | Delivered logs
Revenue from External Customer
Net sales	177	205
Timberlands | South | Delivered logs
Revenue from External Customer
Net sales	150	159
Timberlands | North | Delivered logs
Revenue from External Customer
Net sales	17	29
Timberlands | Domestic grade sales | West | Delivered logs
Revenue from External Customer
Net sales	87	101
Timberlands | Export grade sales | West | Delivered logs
Revenue from External Customer
Net sales	90	104
Real Estate & ENR
Revenue from External Customer
Net sales	112	118
Real Estate & ENR | Real Estate
Revenue from External Customer
Net sales	95	96
Real Estate & ENR | Energy and natural resources
Revenue from External Customer
Net sales	17	22
Wood Products
Revenue from External Customer
Net sales	1,235	1,094
Wood Products | Structural lumber
Revenue from External Customer
Net sales	508	444
Wood Products | Oriented strand board
Revenue from External Customer
Net sales	190	160
Wood Products | Engineered solid section
Revenue from External Customer
Net sales	127	116
Wood Products | Engineered I-joists
Revenue from External Customer
Net sales	78	70
Wood Products | Softwood plywood
Revenue from External Customer
Net sales	39	44
Wood Products | Medium density fiberboard
Revenue from External Customer
Net sales	44	38
Wood Products | Complementary building products
Revenue from External Customer
Net sales	153	137
Wood Products | Other
Revenue from External Customer
Net sales	$ 96	$ 85