SELECTED QUARTERLY FINANCIAL INFORMATION (unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net sales and revenues	$ 2,000	$ 1,772	$ 1,793	$ 1,494	$ 1,615	$ 1,569	$ 1,610	$ 1,422	$ 7,059	$ 6,216	$ 5,954
Operating income	256	202	176	101	131	100	127	236	735	594	454
Earnings from continuing operations before income taxes	182	130	101	26	55	29	19	154	439	257	82
Net earnings	142	117	84	41	65	157	10	99	384	331	1,283
Net earnings attributable to Weyerhaeuser common shareholders	$ 143	$ 117	$ 84	$ 41	$ 65	$ 157	$ 10	$ 99	$ 385	$ 331	$ 1,281
Basic net earnings per share attributable to Weyerhaeuser common shareholders	$ 0.26	$ 0.22	$ 0.16	$ 0.08	$ 0.12	$ 0.29	$ 0.02	$ 0.18	$ 0.71	$ 0.62	$ 4.00
Diluted net earnings per share attributable to Weyerhaeuser common shareholders	$ 0.26	$ 0.22	$ 0.16	$ 0.08	$ 0.12	$ 0.29	$ 0.02	$ 0.18	$ 0.71	$ 0.61	$ 3.99
Dividends paid per share	$ 0.17	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.62	$ 0.60	$ 26.61
Maximum
Market prices - high/low	$ 28.52	$ 27.15	$ 22.36	$ 22.28	$ 18.88	$ 22.57	$ 25.14	$ 25.20	$ 28.52	$ 25.20
Minimum
Market prices - high/low	$ 24.99	$ 22.16	$ 18.69	$ 18.78	$ 15.25	$ 15.55	$ 20.01	$ 19.55	$ 18.69	$ 15.25