Earnings Per Common Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Earnings Per Common Share Calculations

($ in millions, except per share amounts)	2017		2016		2015
	As Restated		As Restated
Earnings per common share (attributable to PPG)
Income from continuing operations, net of tax		$1,369		$543		$1,311
Income from discontinued operations, net of tax	225		330		95
Net income (attributable to PPG)		$1,594		$873		$1,406
Weighted average common shares outstanding	256.1		265.6		271.4
Effect of dilutive securities:
Stock options	0.9		0.8		1.0
Other stock compensation plans	0.8		1.0		1.2
Potentially dilutive common shares	1.7		1.8		2.2
Adjusted weighted average common shares outstanding	257.8		267.4		273.6
Earnings per common share (attributable to PPG):
Income from continuing operations, net of tax		$5.34		$2.05		$4.83
Income from discontinued operations, net of tax	0.88		1.24		0.35
Net income (attributable to PPG)		$6.22		$3.29		$5.18
Earnings per common share - assuming dilution (attributable to PPG)
Income from continuing operations, net of tax		$5.31		$2.04		$4.79
Income from discontinued operations, net of tax	0.87		1.23		0.35
Net income (attributable to PPG)		$6.18		$3.27		$5.14