SELECTED QUARTERLY FINANCIAL INFORMATION (unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net sales and revenues	$ 1,615	$ 1,569	$ 1,610	$ 1,422	$ 1,516	$ 1,514	$ 1,641	$ 1,283	$ 6,216	$ 5,954	$ 5,068
Operating Income	131	100	127	236	54	160	155	85	594	454	(379)
Earnings (loss) from continuing operations before income taxes	55	29	19	154	(35)	84	12	21	257	82	(774)
Net earnings (loss)	65	157	10	99	171	1,116	14	(18)	331	1,283	(568)
Net earnings (loss) attributable to Weyerhaeuser common shareholders	$ 65	$ 157	$ 10	$ 99	$ 171	$ 1,116	$ 14	$ (20)	$ 331	$ 1,281	$ (545)
Basic net earnings per share attributable to Weyerhaeuser common shareholders	$ 0.12	$ 0.29	$ 0.02	$ 0.18	$ 0.32	$ 3.52	$ 0.07	$ (0.10)	$ 0.62	$ 4.00	$ (2.58)
Diluted net earnings per share atrributable to Weyerhaeuser common shareholders	$ 0.12	$ 0.29	$ 0.02	$ 0.18	$ 0.32	$ 3.50	$ 0.07	$ (0.10)	$ 0.61	$ 3.99	$ (2.58)
Dividends paid per share	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.05	$ 26.46	$ 0.05	$ 0.05	$ 0.60	$ 26.61	$ 0.60
Maximum
Market prices - high/low	$ 18.88	$ 22.57	$ 25.14	$ 25.20	$ 19.00	$ 41.83	$ 53.30	$ 45.32	$ 25.20	$ 53.30
Minimum
Market prices - high/low	$ 15.25	$ 15.55	$ 20.01	$ 19.55	$ 15.23	$ 15.40	$ 35.20	$ 39.25	$ 15.25	$ 15.23