Condensed Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Other Comprehensive Income [Abstract]
Net income attributable to the controlling and noncontrolling interests	$ 1,301	$ 2,445
Other comprehensive income, net of tax:
Defined benefit pension and other postretirement benefits	11	181
Unrealized foreign currency translation adjustment	17	(131)
Net change – derivative financial instruments	3	5
Other comprehensive income, net of tax	31	55
Total comprehensive income	1,332	2,500
Less: amounts attributable to noncontrolling interests:
Net income	(39)	(35)
Unrealized foreign currency translation adjustment	(1)	3
Comprehensive income attributable to PPG	$ 1,292	$ 2,468