SELECTED QUARTERLY FINANCIAL INFORMATION (unaudited) - Key Quarterly Financial Data for the Last Two Years (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net sales	$ 1,788	$ 1,915	$ 1,964	$ 1,736	$ 1,768	$ 1,857	$ 1,874	$ 1,755	$ 7,403	$ 7,254	$ 5,989
Operating income (loss)	294	318	400	308	(155)	243	293	253	1,320	634	618
Earnings (loss) from continuing operations before income taxes	214	237	328	234	(252)	170	221	181	1,013	320	322
Net earnings	177	1,164	291	194	54	167	198	144	1,826	563	384
Net earnings attributable to Weyerhaeuser common shareholders	166	1,153	280	183	43	157	196	144	1,782	540	385
Basic net earnings per share attributable to Weyerhaeuser common shareholders	$ 0.32	$ 2.17	$ 0.48	$ 0.31	$ 0.07	$ 0.27	$ 0.35	$ 0.26	$ 3.20	$ 0.95	$ 0.71
Diluted net earnings per share attributable to Weyerhaeuser common shareholders	$ 0.31	$ 2.15	$ 0.47	$ 0.31	$ 0.07	$ 0.27	$ 0.35	$ 0.26	$ 3.18	$ 0.95	$ 0.71
Dividends paid per share	$ 0.29	$ 0.29	$ 0.22	$ 0.22	$ 0.22	$ 0.22	$ 0.20	$ 0.17	$ 1.02	$ 0.81	$ 0.62
Net gain on divestiture									972	0	0
Maximum
Market prices - high/low	$ 36.88	$ 34.60	$ 33.26	$ 31.59	$ 32.00	$ 29.86	$ 33.24	$ 31.74	$ 36.88	$ 33.24
Minimum
Market prices - high/low	$ 31.61	$ 31.09	$ 27.48	$ 28.63	$ 28.01	$ 26.64	$ 26.38	$ 28.36	$ 27.48	$ 15.25
Real Estate Divestiture
Net gain on divestiture		972							972
Unallocated Items | Coyote Springs Property | Fair Value, Inputs, Level 2 and 3
Non-cash impairment charge					$ 356