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EARNINGS PER SHARE ATTRIBUTABLE TO INTERNATIONAL PAPER COMPANY COMMON SHAREHOLDERS (Tables)
 9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] 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
September 30,		Nine Months Ended
September 30,
In millions, except per share amounts2021202020212020
Earnings (loss) attributable to International Paper Company common shareholders$864 $204 $1,645 $329 
Weighted average common shares outstanding388.8 393.1 391.0 392.9 
Effect of dilutive securities
Restricted performance share plan3.8 1.5 4.3 1.6 
Weighted average common shares outstanding – assuming dilution392.6 394.6 395.3 394.5 
Basic earnings (loss) per share attributable to International Paper Company Common Shareholders$2.22 $0.52 $4.21 $0.84 
Diluted earnings (loss) per share attributable to International Paper Company Common Shareholders$2.20 $0.52 $4.16 $0.83