Earnings Per Common Share (Tables)

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Earnings Per Common Share Calculations

	December 31
($ in millions, except per share amounts)	2016		2015		2014
Earnings per common share (attributable to PPG)
Income from continuing operations, net of tax	$	564	$	1,338	$	1,085
Income from discontinued operations, net of tax	$	313	$	68	$	1,017
Net income (attributable to PPG)	$	877	$	1,406	$	2,102
Weighted average common shares outstanding	265.6		271.4		276.6
Effect of dilutive securities:
Stock options	0.8		1.0		1.4
Other stock compensation plans	1.0		1.2		1.6
Potentially dilutive common shares	1.8		2.2		3.0
Adjusted weighted average common shares outstanding	267.4		273.6		279.6
Earnings per common share (attributable to PPG):
Income from continuing operations, net of tax	$	2.12	$	4.93	$	3.92
Income from discontinued operations, net of tax	$	1.18	$	0.25	$	3.68
Net income (attributable to PPG)	$	3.30	$	5.18	$	7.60
Earnings per common share - assuming dilution (attributable to PPG)
Income from continuing operations, net of tax	$	2.11	$	4.89	$	3.88
Income from discontinued operations, net of tax	$	1.17	$	0.25	$	3.64
Net income (attributable to PPG)	$	3.28	$	5.14	$	7.52