Condensed Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Jun. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income attributable to the controlling and noncontrolling interests	$ 255	$ 364	$ 3,071	$ 811
Other comprehensive income, net of tax:
Pension and other postretirement benefits	0	13	198	71
Foreign currency translation	172	85	(18)	38
Unrealized losses on marketable securities	(1)	0	0	0
Derivative financial instruments	2	(4)	9	(10)
Other comprehensive income, net of tax	173	94	189	99
Total comprehensive income	428	458	3,260	910
Less: amounts attributable to noncontrolling interests:
Net income	(29)	(25)	(94)	(97)
Foreign currency translation	(3)	(5)	8	(3)
Comprehensive income attributable to PPG	$ 396	$ 428	$ 3,174	$ 810