Acquisitions and Dispositions (Net Sales and Earnings from Discontinued Operations) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain from divestiture of PPG's interest in the Transitions Optical joint venture and sunlens business			$ 1,468
(Loss)/Income from discontinued operations, net of tax	$ 0	$ (7)		$ 1	$ 1,011
Less: Net income attributable to noncontrolling interests	(5)	(6)		(10)	(45)
Net income from discontinued operations (attributable to PPG)	0	(7)		1	978
Transitions Optical Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	0	0		0	247
Income from operations	0	0		0	104
Net gain from divestiture of PPG's interest in the Transitions Optical joint venture and sunlens business	0	0		0	1,468
Income tax (expense) benefit	0	(7)		1	(561)
(Loss)/Income from discontinued operations, net of tax	0	(7)		1	1,011
Less: Net income attributable to noncontrolling interests	0	0		0	(33)
Net income from discontinued operations (attributable to PPG)	$ 0	$ (7)		$ 1	$ 978