Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net (loss) income attributable to the controlling and noncontrolling interests	$ (179)	$ 439	$ 551	$ 1,109
Other comprehensive income (loss), net of tax:
Defined benefit pension and other postretirement benefits, net	348	35	391	109
Unrealized foreign currency translation adjustments	(147)	(300)	(231)	(599)
Derivative financial instruments, net	8	2	0	6
Other comprehensive income (loss), net of tax	209	(263)	160	(484)
Total comprehensive income	30	176	711	625
Less: amounts attributable to noncontrolling interests:
Net income	(5)	(6)	(18)	(17)
Unrealized foreign currency translation adjustments	(1)	3	1	8
Comprehensive income attributable to PPG	$ 24	$ 173	$ 694	$ 616