SELECTED QUARTERLY FINANCIAL INFORMATION (unaudited) - Key Quarterly Financial Data for the Last Two Years (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net sales	$ 1,596	$ 1,709	$ 1,655	$ 1,405	$ 1,266	$ 1,355	$ 1,345	$ 1,280	$ 6,365	$ 5,246	$ 5,489
Operating income from continuing operations	185	274	258	153	142	166	200	150	870	658	987
Earnings from continuing operations before income taxes	87	184	161	72	64	88	124	77	504	353	687
Net earnings	551	227	168	81	70	191	144	101	1,027	506	1,826
Net earnings attributable to Weyerhaeuser common shareholders	$ 551	$ 227	$ 157	$ 70	$ 59	$ 180	$ 133	$ 90	$ 1,005	$ 462	$ 1,782
Basic net earnings per share attributable to Weyerhaeuser common shareholders	$ 0.74	$ 0.30	$ 0.21	$ 0.11	$ 0.11	$ 0.35	$ 0.26	$ 0.17	$ 1.40	$ 0.89	$ 3.20
Diluted net earnings per share attributable to Weyerhaeuser common shareholders	0.73	0.30	0.21	0.11	0.11	0.35	0.26	0.17	1.39	0.89	3.18
Dividends paid per share	0.31	0.31	0.31	0.31	0.31	0.31	0.29	0.29	1.24	1.20	$ 1.02
Maximum
Market prices - high/low	33.28	33.17	32.56	31.38	32.72	32.34	33.19	37.04	33.28	37.04
Minimum
Market prices - high/low	$ 28.58	$ 29.52	$ 26.55	$ 22.06	$ 26.73	$ 26.76	$ 31.06	$ 32.74	$ 22.06	$ 26.73