Consolidated Statement of Shareholders' Equity (USD $) In Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income/(Loss)	Total PPG	Non-controlling Interests
Beginning balance at Dec. 31, 2011	$ 3,446	$ 484	$ 783	$ 9,288	$ (5,506)	$ (1,800)	$ 3,249	$ 197
Net income attributable to the controlling and noncontrolling interests	1,064			941			941	123
Other comprehensive income, net of tax	139					134	134	5
Cash dividends	(358)			(358)			(358)
Purchase of treasury stock	(92)				(92)		(92)
Issuance of treasury stock	137		35		102		137
Stock-based compensation activity	55		55				55
Dividends paid on subsidiary common stock to noncontrolling interests	(111)							(111)
Joint venture formation and consolidation	42		(3)				(3)	45
Ending balance at Dec. 31, 2012	4,322	484	870	9,871	(5,496)	(1,666)	4,063	259
Net income attributable to the controlling and noncontrolling interests	3,353			3,231			3,231	122
Other comprehensive income, net of tax	399					406	406	(7)
Cash dividends	(345)			(345)			(345)
Purchase of treasury stock	(1,000)				(1,000)		(1,000)
Issuance of treasury stock	80		25		55		80
Stock-based compensation activity	58		58				58
Separation and merger tender offer	(1,561)				(1,561)		(1,561)
Dividends paid on subsidiary common stock to noncontrolling interests	(90)							(90)
Joint venture formation and consolidation	(18)							(18)
Ending balance at Dec. 31, 2013	5,198	484	953	12,757	(8,002)	(1,260)	4,932	266
Net income attributable to the controlling and noncontrolling interests	2,159			2,102			2,102	57
Other comprehensive income, net of tax	(862)					(856)	(856)	(6)
Cash dividends	(361)			(361)			(361)
Purchase of treasury stock	(750)				(750)		(750)
Issuance of treasury stock	77		39		38		77
Stock-based compensation activity	64		64				64
Dividends paid on subsidiary common stock to noncontrolling interests	(50)							(50)
Reductions in noncontrolling interests	(210)		(28)				(28)	(182)
Ending balance at Dec. 31, 2014	$ 5,265	$ 484	$ 1,028	$ 14,498	$ (8,714)	$ (2,116)	$ 5,180	$ 85