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Earnings Per Share Attributable To International Paper Company Common Shareholders (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share, Basic and Diluted [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: 
In millions, except per share amounts
2018
 
2017
 
2016
Earnings (loss) from continuing operations attributable to International Paper common shareholders
$
1,667

 
$
2,110

 
$
802

Weighted average common shares outstanding
409.1

 
412.7

 
411.1

Effect of dilutive securities:
 
 
 
 
 
Restricted performance share plan
5.1

 
5.0

 
4.5

Weighted average common shares outstanding  – assuming dilution
414.2

 
417.7

 
415.6

Basic earnings (loss) per share from continuing operations
$
4.07

 
$
5.11

 
$
1.95

Diluted earnings (loss) per share from continuing operations
$
4.02

 
$
5.05

 
$
1.93