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Earnings Per Share
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Earnings Per 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
2015
 
2014
 
2013
Numerator for earnings per share calculation:
 

 
 

 
 

Income from continuing operations attributable to common stockholders(1)
$
5,202

 
$
4,626

 
$
4,600

Denominator for earnings per share calculation:
 

 
 

 
 

Weighted average shares, basic
1,118

 
1,161

 
1,217

Effect of dilutive securities
8

 
8

 
9

Weighted average shares, diluted
1,126

 
1,169

 
1,226

 
 
 
 
 
 
Earnings per share from continuing operations:
 

 
 

 
 

Basic
$
4.65

 
$
3.98

 
$
3.78

Diluted
$
4.62

 
$
3.96

 
$
3.75



(1)
Comprised of income from continuing operations less amounts allocable to participating securities of $27 million and $19 million for the years ended December 31, 2015 and 2014, respectively.