Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income attributable to the controlling and noncontrolling interests	$ 354	$ 327
Other comprehensive income, net of tax:
Defined benefit pension and other postretirement benefits	19	68
Unrealized foreign currency translation adjustments	45	(272)
Derivative financial instruments, net	(8)	6
Other comprehensive income (loss), net of tax	56	(198)
Total comprehensive income	410	129
Less: amounts attributable to noncontrolling interests:
Net income	(7)	(5)
Unrealized foreign currency translation adjustments	3	5
Comprehensive income attributable to PPG	$ 406	$ 129