Shareholders' Equity (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 5,198	$ 4,322
Net income	1,301	2,445
Other comprehensive income, net of tax	31	55
Cash dividends	(85)	(84)
Issuance of treasury stock	46	44
Purchase of treasury stock	(200)	(140)
Stock-based compensation activity	7	(2)
Dividends paid on subsidiary common stock to noncontrolling interests	(40)	(18)
Joint venture formation and consolidation (Note 9)		(1,562)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	(169)	(19)
Ending balance	6,089	5,041
Total PPG Shareholders' Equity [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	4,932	4,063
Net income	1,262	2,410
Other comprehensive income, net of tax	30	58
Cash dividends	(85)	(84)
Issuance of treasury stock	46	44
Purchase of treasury stock	(200)	(140)
Stock-based compensation activity	7	(2)
Joint venture formation and consolidation (Note 9)		(1,562)
Ending balance	5,992	4,787
Non-controlling Interests [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	266	259
Net income	39	35
Other comprehensive income, net of tax	1	(3)
Dividends paid on subsidiary common stock to noncontrolling interests	(40)	(18)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	(169)	(19)
Ending balance	$ 97	$ 254