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EARNINGS PER SHARE ATTRIBUTABLE TO INTERNATIONAL PAPER COMPANY COMMON SHAREHOLDERS (Note)
3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Earnings Per Share [Note Text Block]

Basic earnings per share is computed by dividing earnings by the weighted average number of common shares outstanding. Diluted earnings per share is computed assuming that all potentially dilutive securities were converted into common shares. There are no adjustments required to be made to net income for purposes of computing basic and diluted earnings per share. A reconciliation of the amounts included in the computation of basic earnings (loss) per share and diluted earnings (loss) per share is as follows: 
 Three Months Ended
March 31,
In millions, except per share amounts20212020
Earnings (loss) attributable to International Paper Company common shareholders$349 $(141)
Weighted average common shares outstanding392.8 392.6 
Effect of dilutive securities (a)
Restricted performance share plan2.0 — 
Weighted average common shares outstanding – assuming dilution394.8 392.6 
Basic earnings (loss) per share attributable to International Paper Company Common Shareholders$0.89 $(0.36)
Diluted earnings (loss) per share attributable to International Paper Company Common Shareholders$0.88 $(0.36)

(a) Securities are not included in the table in periods when antidilutive