Shareholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ 5,069	$ 5,265
Net income	$ 376	$ 342	730	669
Other comprehensive income, net of tax	(111)	(23)	(49)	(221)
Cash dividends			(203)	(189)
Issuance of treasury stock			46	65
Purchase of treasury stock			(150)	(351)
Stock-based compensation activity				23
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests			(10)	(5)
Ending balance	5,433	5,256	5,433	5,256
Total PPG Shareholders' Equity [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			4,983	5,180
Net income			717	659
Other comprehensive income, net of tax			(47)	(216)
Cash dividends			(203)	(189)
Issuance of treasury stock			46	65
Purchase of treasury stock			(150)	(351)
Stock-based compensation activity				23
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests			0	0
Ending balance	5,346	5,171	5,346	5,171
Non-controlling Interests [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			86	85
Net income			13	10
Other comprehensive income, net of tax			(2)	(5)
Cash dividends			0	0
Issuance of treasury stock			0	0
Purchase of treasury stock			0	0
Stock-based compensation activity				0
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests			(10)	(5)
Ending balance	$ 87	$ 85	$ 87	$ 85