Acquisitions and Dispositions (Net Sales and Earnings from Discontinued Operations) (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended			9 Months Ended
	Sep. 30, 2014	Jul. 31, 2014	Sep. 30, 2015	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2015	Sep. 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	$ (6)		$ 1	$ 1,005
Net income from discontinued operations (attributable to PPG)			0	(6)		1	972
Flat Glass Manufacturing Facility [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	$ 22
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			0	(6)		1	(567)
(Loss)/Income from discontinued operations, net of tax			0	(6)		1	1,005
Less: Net income attributable to noncontrolling interests			0	0		0	(33)
Net income from discontinued operations (attributable to PPG)			$ 0	$ (6)		$ 1	$ 972
Pittsburgh Glass Works LLC [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Equity Method Investment, Dividends or Distributions		$ 38
Income (Loss) from Equity Method Investments		$ 94