REVENUE RECOGNITION - Revenue by Major Products (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue from External Customer
Net sales	$ 3,144	$ 1,631	$ 5,650	$ 3,359
Timberlands
Revenue from External Customer
Net sales	405	359	784	740
Timberlands | Delivered logs
Revenue from External Customer
Net sales	376	331	724	675
Timberlands | Stumpage and pay-as-cut timber
Revenue from External Customer
Net sales	7	5	13	10
Timberlands | Recreational and other lease revenue
Revenue from External Customer
Net sales	16	16	32	31
Timberlands | Other
Revenue from External Customer
Net sales	6	7	15	24
Timberlands | West | Delivered logs
Revenue from External Customer
Net sales	222	179	423	356
Timberlands | South | Delivered logs
Revenue from External Customer
Net sales	145	145	276	295
Timberlands | North | Delivered logs
Revenue from External Customer
Net sales	9	7	25	24
Timberlands | Domestic grade sales | West | Delivered logs
Revenue from External Customer
Net sales	80	71	159	158
Timberlands | Export grade sales | West | Delivered logs
Revenue from External Customer
Net sales	142	108	264	198
Real Estate & ENR
Revenue from External Customer
Net sales	110	65	216	177
Real Estate & ENR | Real Estate
Revenue from External Customer
Net sales	83	48	167	143
Real Estate & ENR | Energy and natural resources
Revenue from External Customer
Net sales	27	17	49	34
Wood Products
Revenue from External Customer
Net sales	2,629	1,207	4,650	2,442
Wood Products | Structural lumber
Revenue from External Customer
Net sales	1,349	538	2,339	1,046
Wood Products | Oriented strand board
Revenue from External Customer
Net sales	605	179	1,043	369
Wood Products | Engineered solid section
Revenue from External Customer
Net sales	166	111	308	238
Wood Products | Engineered I-joists
Revenue from External Customer
Net sales	104	70	187	148
Wood Products | Softwood plywood
Revenue from External Customer
Net sales	69	34	125	73
Wood Products | Medium density fiberboard
Revenue from External Customer
Net sales	43	33	91	77
Wood Products | Complementary building products
Revenue from External Customer
Net sales	213	169	384	322
Wood Products | Other
Revenue from External Customer
Net sales	$ 80	$ 73	$ 173	$ 169