Earnings Per Common Share (Tables)

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Earnings Per Common Share Calculations

		December 31
($ in millions, except per share amounts)		2015		2014		2013
Earnings per common share (attributable to PPG)
	Income from continuing operations, net of tax	$	1,405	$	1,133	$	950
	Income from discontinued operations, net of tax	$	1	$	969	$	2,281
	Net income (attributable to PPG)	$	1,406	$	2,102	$	3,231
	Weighted average common shares outstanding	271.4		276.6		286.8
	Effect of dilutive securities:
	Stock options	1.0		1.4		1.6
	Other stock compensation plans	1.2		1.6		1.8
	Potentially dilutive common shares	2.2		3.0		3.4
	Adjusted weighted average common shares outstanding	273.6		279.6		290.2
	Earnings per common share (attributable to PPG):
	Income from continuing operations, net of tax	$	5.18	$	4.10	$	3.31
	Income from discontinued operations, net of tax	$	—	$	3.50	$	7.96
	Net income (attributable to PPG)	$	5.18	$	7.60	$	11.27
Earnings per common share - assuming dilution (attributable to PPG)
	Income from continuing operations, net of tax	$	5.14	$	4.05	$	3.27
	Income from discontinued operations, net of tax	$	—	$	3.47	$	7.86
	Net income (attributable to PPG)	$	5.14	$	7.52	$	11.13