Discontinued Operations (Net sales and earnings from discontinued operations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from operations					$ 0
Net gain from separation and merger of commodity chemicals business		1,468
Income from discontinued operations, net of tax	(7)		47	1,011	2,295
Less: Net income attributable to non-controlling interests, discontinued operations	6		30	45	65
Net income from discontinued operations (attributable to PPG)	(7)		23	978	2,242
Commodity Chemicals Segment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales					108
Net gain from separation and merger of commodity chemicals business					2,192
Income tax expense					(1)
Income from discontinued operations, net of tax					2,191
Less: Net income attributable to non-controlling interests, discontinued operations					0
Net income from discontinued operations (attributable to PPG)					2,191
Transitions Optical Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	0		212	247	443
Income from operations	0		67	104	144
Net gain from separation and merger of commodity chemicals business	0		0	1,468	0
Income tax expense	(7)		(20)	(561)	(40)
Income from discontinued operations, net of tax	(7)		47	1,011	104
Less: Net income attributable to non-controlling interests, discontinued operations	0		(24)	(33)	(53)
Net income from discontinued operations (attributable to PPG)	$ (7)		$ 23	$ 978	$ 51