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NET EARNINGS PER SHARE - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013 6.375 percent Mandatory Convertible Preference Shares, Series A
Basic earnings per share attributable to Weyerhaeuser common shareholders	$ 0.27	$ 0.22	$ 0.89	$ 0.45
Diluted earnings per share attributable to Weyerhaeuser common shareholders	$ 0.27	$ 0.22	$ 0.88	$ 0.45
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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