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Earnings Per Common Share
 12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Earnings Per Common Share
Earnings Per Common Share
The earnings per common share calculations for the three years ended December 31, 2012, are as follows:
(Millions, except per share amounts)
2012
 
2011
 
2010
Earnings per common share (attributable to PPG)
 
Net income (attributable to PPG)
$
941

 
$
1,095

 
$
769

 
Weighted average common shares outstanding
153.4

 
157.3

 
164.5

 
Earnings per common share (attributable to PPG):
 
Net income (attributable to PPG)
$
6.13

 
$
6.96

 
$
4.67

Earnings per common share - assuming dilution (attributable to PPG)
 
Net income (attributable to PPG)
$
941

 
$
1,095

 
$
769

 
Weighted average common shares outstanding
153.4

 
157.3

 
164.5

 
Effect of dilutive securities:
 

 
 

 
 

 
Stock options
0.8

 
1.1

 
0.8

 
Other stock compensation plans
0.9

 
0.9

 
0.6

 
Potentially dilutive common shares
1.7

 
2.0

 
1.4

 
Adjusted weighted average common shares outstanding
155.1

 
159.3

 
165.9

Earnings per common share - assuming dilution (attributable to PPG)
 
Net income (attributable to PPG)
$
6.06

 
$
6.87

 
$
4.63


There were no outstanding stock options excluded in 2012 and 0.6 million and 1.2 million outstanding stock options excluded in 2011 and 2010, respectively, from the computation of diluted earnings per common share due to their anti-dilutive effect.