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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Reconciliation of basic and diluted earnings per common share
Earnings Per Share
 
The following is a reconciliation of basic and diluted earnings per share from continuing operations for the respective years:
 
In millions, except per share amounts
2014
 
2013
 
2012
Numerator for earnings per share calculation:
 

 
 

 
 

Income from continuing operations attributable to common stockholders(1)
$
4,626

 
$
4,600

 
$
3,871

Denominator for earnings per share calculation:
 

 
 

 
 

Weighted average shares, basic
1,161

 
1,217

 
1,271

Effect of dilutive securities
8

 
9

 
9

Weighted average shares, diluted
1,169

 
1,226

 
1,280

 
 
 
 
 
 
Earnings per share from continuing operations:
 

 
 

 
 

Basic
$
3.98

 
$
3.78

 
$
3.05

Diluted
$
3.96

 
$
3.75

 
$
3.02



(1)
Comprised of income from continuing operations less amounts allocable to participating securities of $19 million for the year ended December 31, 2014.