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Earnings Per Share Attributable To International Paper Company Common Shareholders (Tables)
 12 Months Ended
Dec. 31, 2017
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
2017
 
2016
 
2015
Earnings (loss) from continuing operations attributable to International Paper common shareholders
$
2,110

 
$
802

 
$
853

Weighted average common shares outstanding
412.7

 
411.1

 
417.4

Effect of dilutive securities:
 
 
 
 
 
Restricted performance share plan
5.0

 
4.5

 
3.2

Weighted average common shares outstanding  – assuming dilution
417.7

 
415.6

 
420.6

Basic earnings (loss) per share from continuing operations
$
5.11

 
$
1.95

 
$
2.05

Diluted earnings (loss) per share from continuing operations
$
5.05

 
$
1.93

 
$
2.03