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EARNINGS PER SHARE ATTRIBUTABLE TO INTERNATIONAL PAPER COMPANY COMMON SHAREHOLDERS (Tables)
 9 Months Ended
Sep. 30, 2019
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 from continuing operations, and diluted earnings (loss) per share from continuing operations is as follows: 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
In millions, except per share amounts
2019
 
2018
 
2019
 
2018
Earnings (loss) from continuing operations attributable to International Paper Company common shareholders
$
344

 
$
562

 
$
1,060

 
$
1,351

Weighted average common shares outstanding
392.6

 
407.4

 
396.3

 
411.4

Effect of dilutive securities
 
 
 
 
 
 
 
Restricted performance share plan
2.8

 
4.0

 
3.3

 
4.9

Weighted average common shares outstanding – assuming dilution
395.4

 
411.4

 
399.6

 
416.3

Basic earnings (loss) per share from continuing operations
$
0.88

 
$
1.38

 
$
2.67

 
$
3.28

Diluted earnings (loss) per share from continuing operations
$
0.87

 
$
1.37

 
$
2.65

 
$
3.25