Shareholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 5,069	$ 5,265
Net income	354	327
Other comprehensive income, net of tax	56	(198)
Cash dividends	(96)	(91)
Issuance of treasury stock	34	58
Purchase of treasury stock	(150)	(200)
Stock-based compensation activity	(16)	2
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	(3)	(5)
Ending balance	5,248	5,158
Total PPG Shareholders' Equity [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	4,983	5,180
Net income	347	322
Other comprehensive income, net of tax	59	(193)
Cash dividends	(96)	(91)
Issuance of treasury stock	34	58
Purchase of treasury stock	(150)	(200)
Stock-based compensation activity	(16)	2
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	0	0
Ending balance	5,161	5,078
Non-controlling Interests [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	86	85
Net income	7	5
Other comprehensive income, net of tax	(3)	(5)
Cash dividends	0	0
Issuance of treasury stock	0	0
Purchase of treasury stock	0	0
Stock-based compensation activity	0	0
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	(3)	(5)
Ending balance	$ 87	$ 80