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NET EARNINGS PER SHARE - Additional Information (Details) (USD $) In Thousands, 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
Basic earnings per share attributable to Weyerhaeuser common shareholders	$ 0.32us-gaap_EarningsPerShareBasic	$ 2.17us-gaap_EarningsPerShareBasic	$ 0.48us-gaap_EarningsPerShareBasic	$ 0.31us-gaap_EarningsPerShareBasic	$ 0.07us-gaap_EarningsPerShareBasic	$ 0.27us-gaap_EarningsPerShareBasic	$ 0.35us-gaap_EarningsPerShareBasic	$ 0.26us-gaap_EarningsPerShareBasic	$ 3.20us-gaap_EarningsPerShareBasic	$ 0.95us-gaap_EarningsPerShareBasic	$ 0.71us-gaap_EarningsPerShareBasic
Diluted earnings per share attributable to Weyerhaeuser common shareholders	$ 0.31us-gaap_EarningsPerShareDiluted	$ 2.15us-gaap_EarningsPerShareDiluted	$ 0.47us-gaap_EarningsPerShareDiluted	$ 0.31us-gaap_EarningsPerShareDiluted	$ 0.07us-gaap_EarningsPerShareDiluted	$ 0.27us-gaap_EarningsPerShareDiluted	$ 0.35us-gaap_EarningsPerShareDiluted	$ 0.26us-gaap_EarningsPerShareDiluted	$ 3.18us-gaap_EarningsPerShareDiluted	$ 0.95us-gaap_EarningsPerShareDiluted	$ 0.71us-gaap_EarningsPerShareDiluted
New shares issued									0	33,350	0
6.375 percent Mandatory Convertible Preference Shares, Series A
New shares issued							13,800
New shares issued, date							Jun. 24, 2013

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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