Condensed Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net income attributable to the controlling and noncontrolling interests	$ 2,445	$ 51
Other comprehensive income, net of tax:
Pension and other postretirement benefits	181	8
Unrealized currency translation adjustment	(131)	137
Net change – derivatives	5	6
Other comprehensive income, net of tax	55	151
Total comprehensive income	2,500	202
Less: amounts attributable to noncontrolling interests:
Net income	(35)	(38)
Unrealized currency translation adjustment	3	(4)
Comprehensive income attributable to PPG	$ 2,468	$ 160