REVENUE RECOGNITION - Revenue by Major Products (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue from External Customer
Net sales	$ 2,506	$ 1,728
Timberlands
Revenue from External Customer
Net sales	379	381
Timberlands | Delivered logs
Revenue from External Customer
Net sales	348	344
Timberlands | Stumpage and pay-as-cut timber
Revenue from External Customer
Net sales	6	5
Timberlands | Recreational and other lease revenue
Revenue from External Customer
Net sales	16	15
Timberlands | Other
Revenue from External Customer
Net sales	9	17
Timberlands | West | Delivered logs
Revenue from External Customer
Net sales	201	177
Timberlands | South | Delivered logs
Revenue from External Customer
Net sales	131	150
Timberlands | North | Delivered logs
Revenue from External Customer
Net sales	16	17
Timberlands | Domestic grade sales | West | Delivered logs
Revenue from External Customer
Net sales	79	87
Timberlands | Export grade sales | West | Delivered logs
Revenue from External Customer
Net sales	122	90
Real Estate & ENR
Revenue from External Customer
Net sales	106	112
Real Estate & ENR | Real Estate
Revenue from External Customer
Net sales	84	95
Real Estate & ENR | Energy and natural resources
Revenue from External Customer
Net sales	22	17
Wood Products
Revenue from External Customer
Net sales	2,021	1,235
Wood Products | Structural lumber
Revenue from External Customer
Net sales	990	508
Wood Products | Oriented strand board
Revenue from External Customer
Net sales	438	190
Wood Products | Engineered solid section
Revenue from External Customer
Net sales	142	127
Wood Products | Engineered I-joists
Revenue from External Customer
Net sales	83	78
Wood Products | Softwood plywood
Revenue from External Customer
Net sales	56	39
Wood Products | Medium density fiberboard
Revenue from External Customer
Net sales	48	44
Wood Products | Complementary building products
Revenue from External Customer
Net sales	171	153
Wood Products | Other
Revenue from External Customer
Net sales	$ 93	$ 96