Earnings Per Common Share (Tables)

9 Months Ended

Sep. 30, 2012

Earnings Per Share [Abstract]

Earnings Per Common Share Calculations

The following table presents the earnings per common share calculations for the three and nine months ended September 30, 2012 and 2011.

	Three Months Ended September 30				Nine Months Ended September 30
(Millions, except per share amounts)	2012		2011		2012		2011
Earnings per common share (attributable to PPG)
Net income (attributable to PPG)	$	339	$	311	$	714	$	879
Weighted average common shares outstanding	153.7		156.8		153.2		158.5
Earnings per common share (attributable to PPG)	$	2.21	$	1.98	$	4.66	$	5.55
Earnings per common share - assuming dilution (attributable to PPG)
Net income (attributable to PPG)	$	339	$	311	$	714	$	879
Weighted average common shares outstanding	153.7		156.8		153.2		158.5
Effect of dilutive securities:
Stock options	0.9		1.0		0.8		1.2
Other stock compensation plans	0.9		0.8		0.8		0.8
Potentially dilutive common shares	1.8		1.8		1.6		2.0
Adjusted weighted average common shares outstanding	155.5		158.6		154.8		160.5
Earnings per common share - assuming dilution (attributable to PPG)	$	2.18	$	1.96	$	4.61	$	5.48