REVENUE RECOGNITION (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue from External Customer [Line Items]
Sales to unaffiliated customers	$ 2,065	$ 1,808	$ 3,930	$ 3,501
Timberlands
Revenue from External Customer [Line Items]
Sales to unaffiliated customers	482	469	987	955
Timberlands | Delivered logs
Revenue from External Customer [Line Items]
Sales to unaffiliated customers	447	402	909	822
Timberlands | Stumpage and pay-as-cut timber
Revenue from External Customer [Line Items]
Sales to unaffiliated customers	11	17	26	29
Timberlands | Recreational and other lease revenue
Revenue from External Customer [Line Items]
Sales to unaffiliated customers	15	15	29	29
Timberlands | Other
Revenue from External Customer [Line Items]
Sales to unaffiliated customers	9	35	23	75
Timberlands | West | Delivered logs
Revenue from External Customer [Line Items]
Sales to unaffiliated customers	262	227	528	452
Timberlands | South | Delivered logs
Revenue from External Customer [Line Items]
Sales to unaffiliated customers	158	148	315	296
Timberlands | North | Delivered logs
Revenue from External Customer [Line Items]
Sales to unaffiliated customers	20	16	45	43
Timberlands | Other | Delivered logs
Revenue from External Customer [Line Items]
Sales to unaffiliated customers	7	11	21	31
Timberlands | Domestic sales | West | Delivered logs
Revenue from External Customer [Line Items]
Sales to unaffiliated customers	136	126	273	245
Timberlands | Export sales | West | Delivered logs
Revenue from External Customer [Line Items]
Sales to unaffiliated customers	126	101	255	207
RE & ENR
Revenue from External Customer [Line Items]
Sales to unaffiliated customers	58	46	109	99
RE & ENR | Real estate
Revenue from External Customer [Line Items]
Sales to unaffiliated customers	38	27	72	64
RE & ENR | Energy and natural resources
Revenue from External Customer [Line Items]
Sales to unaffiliated customers	20	19	37	35
Wood Products
Revenue from External Customer [Line Items]
Sales to unaffiliated customers	1,525	1,293	2,834	2,447
Wood Products | Structural lumber
Revenue from External Customer [Line Items]
Sales to unaffiliated customers	681	538	1,250	1,016
Wood Products | Engineered solid section
Revenue from External Customer [Line Items]
Sales to unaffiliated customers	139	130	268	247
Wood Products | Engineered I-joists
Revenue from External Customer [Line Items]
Sales to unaffiliated customers	92	85	170	158
Wood Products | Oriented strand board
Revenue from External Customer [Line Items]
Sales to unaffiliated customers	277	225	509	428
Wood Products | Softwood plywood
Revenue from External Customer [Line Items]
Sales to unaffiliated customers	55	47	105	91
Wood Products | Medium density fiberboard
Revenue from External Customer [Line Items]
Sales to unaffiliated customers	47	51	90	98
Wood Products | Complementary building products
Revenue from External Customer [Line Items]
Sales to unaffiliated customers	160	149	297	271
Wood Products | Other
Revenue from External Customer [Line Items]
Sales to unaffiliated customers	$ 74	$ 68	$ 145	$ 138