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Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Earnings Per Common Share Calculations
Earnings per common share calculated for the years ended December 31, 2014, 2013 and 2012 are as follows:
($ in millions, except per share amounts)
2014
 
2013
 
2012
Earnings per common share (attributable to PPG)
 
Income from continuing operations, net of tax
$
1,133

 
$
950

 
$
663

 
Income from discontinued operations, net of tax
$
969

 
$
2,281

 
$
278

 
Net income (attributable to PPG)
$
2,102

 
$
3,231

 
$
941

 
Weighted average common shares outstanding
138.3

 
143.4

 
153.4

 
Earnings per common share (attributable to PPG):
 
Income from continuing operations, net of tax
$
8.19

 
$
6.62

 
$
4.32

 
Income from discontinued operations, net of tax
$
7.01

 
$
15.91

 
$
1.81

 
Net income (attributable to PPG)
$
15.20

 
$
22.53

 
$
6.13

Earnings per common share - assuming dilution (attributable to PPG)
 
Income from continuing operations, net of tax
$
1,133

 
$
950

 
$
663

 
Income from discontinued operations, net of tax
$
969

 
$
2,281

 
$
278

 
Net income (attributable to PPG)
$
2,102

 
$
3,231

 
$
941

 
Weighted average common shares outstanding
138.3

 
143.4

 
153.4

 
Effect of dilutive securities:
 

 
 

 
 

 
Stock options
0.7

 
0.8

 
0.8

 
Other stock compensation plans
0.8

 
0.9

 
0.9

 
Potentially dilutive common shares
1.5

 
1.7

 
1.7

 
Adjusted weighted average common shares outstanding
139.8

 
145.1

 
155.1

Earnings per common share - assuming dilution (attributable to PPG)
 
Income from continuing operations, net of tax
$
8.10

 
$
6.55

 
$
4.27

 
Income from discontinued operations, net of tax
$
6.93

 
$
15.72

 
$
1.79

 
Net income (attributable to PPG)
$
15.03

 
$
22.27

 
$
6.06