REVENUE RECOGNITION (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue from External Customer
Revenues	$ 1,910	$ 1,872	$ 5,840	$ 5,373
Timberlands
Revenue from External Customer
Revenues	468	491	1,455	1,446
Timberlands | Delivered logs
Revenue from External Customer
Revenues	429	418	1,338	1,240
Timberlands | Stumpage and pay-as-cut timber
Revenue from External Customer
Revenues	13	23	39	52
Timberlands | Recreational and other lease revenue
Revenue from External Customer
Revenues	15	16	44	45
Timberlands | Other
Revenue from External Customer
Revenues	11	34	34	109
Timberlands | West | Delivered logs
Revenue from External Customer
Revenues	238	221	766	673
Timberlands | South | Delivered logs
Revenue from External Customer
Revenues	157	155	472	451
Timberlands | North | Delivered logs
Revenue from External Customer
Revenues	25	25	70	68
Timberlands | Other | Delivered logs
Revenue from External Customer
Revenues	9	17	30	48
Timberlands | Domestic sales | West | Delivered logs
Revenue from External Customer
Revenues	125	102	398	347
Timberlands | Export sales | West | Delivered logs
Revenue from External Customer
Revenues	113	119	368	326
RE & ENR
Revenue from External Customer
Revenues	96	82	205	181
RE & ENR | Real estate
Revenue from External Customer
Revenues	76	64	148	128
RE & ENR | Energy and natural resources
Revenue from External Customer
Revenues	20	18	57	53
Wood Products
Revenue from External Customer
Revenues	1,346	1,299	4,180	3,746
Wood Products | Structural lumber
Revenue from External Customer
Revenues	581	525	1,831	1,541
Wood Products | Engineered solid section
Revenue from External Customer
Revenues	132	131	400	378
Wood Products | Engineered I-joists
Revenue from External Customer
Revenues	91	93	261	251
Wood Products | Oriented strand board
Revenue from External Customer
Revenues	215	243	724	671
Wood Products | Softwood plywood
Revenue from External Customer
Revenues	53	45	158	136
Wood Products | Medium density fiberboard
Revenue from External Customer
Revenues	48	48	138	146
Wood Products | Complementary building products
Revenue from External Customer
Revenues	152	146	449	417
Wood Products | Other
Revenue from External Customer
Revenues	$ 74	$ 68	$ 219	$ 206