Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2012

Equity [Abstract]

Change in Total Shareholders' Equity

The following tables present the change in total shareholders’ equity for the nine months ended September 30, 2012 and 2011, respectively:

(Millions)	Total PPG Shareholders’ Equity			Non- controlling Interests			Total
Balance, January 1, 2012	$	3,249		$	197		$	3,446
Net income	714			97			811
Other comprehensive income, net of tax	96			3			99
Cash dividends	(267		)	—			(267		)
Issuance of treasury stock	121			—			121
Purchase of treasury stock	(92		)	—			(92		)
Stock-based compensation activity	40			—			40
Dividends paid on subsidiary common stock to noncontrolling interests	—			(74		)	(74		)
Joint venture formation and consolidation (Note 9)	—			48			48
Balance, September 30, 2012	$	3,861		$	271		$	4,132

(Millions)	Total PPG Shareholders’ Equity			Non- controlling Interests			Total
Balance, January 1, 2011	$	3,638		$	195		$	3,833
Net income	879			94			973
Other comprehensive income, net of tax	(53		)	(8		)	(61		)
Cash dividends	(268		)	—			(268		)
Issuance of treasury stock	95			—			95
Purchase of treasury stock	(633		)	—			(633		)
Stock-based compensation activity	4			—			4
Dividends paid on subsidiary common stock to noncontrolling interests	—			(36		)	(36		)
Other changes in noncontrolling interests	$	—		$	(1	)	$	(1	)
Balance, September 30, 2011	$	3,662		$	244		$	3,906