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NET EARNINGS PER SHARE - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Basic earnings per share attributable to Weyerhaeuser common shareholders	$ 0.48	$ 0.35	$ 0.79	$ 0.62
Diluted earnings per share attributable to Weyerhaeuser common shareholders	$ 0.47	$ 0.35	$ 0.79	$ 0.61
6.375 percent Mandatory Convertible Preference Shares, Series A
New shares issued		13.8
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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