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EARNINGS PER SHARE ATTRIBUTABLE TO INTERNATIONAL PAPER COMPANY COMMON SHAREHOLDERS (Tables)
 9 Months Ended
Sep. 30, 2020
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 amounts2020201920202019
Earnings (loss) attributable to International Paper Company common shareholders$204 $344 $329 $1,060 
Weighted average common shares outstanding393.1 392.6 392.9 396.3 
Effect of dilutive securities
Restricted performance share plan1.5 2.8 1.6 3.3 
Weighted average common shares outstanding – assuming dilution394.6 395.4 394.5 399.6 
Basic earnings (loss) per share attributable to International Paper Company Common Shareholders$0.52 $0.88 $0.84 $2.67 
Diluted earnings (loss) per share attributable to International Paper Company Common Shareholders$0.52 $0.87 $0.83 $2.65