Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income attributable to the controlling and noncontrolling interests	$ 376	$ 342	$ 730	$ 669
Other comprehensive income (loss), net of tax:
Defined benefit pension and other postretirement benefits, net	24	6	43	74
Unrealized foreign currency translation adjustments	(135)	(27)	(84)	(299)
Derivative financial instruments, net	0	(2)	(8)	4
Other comprehensive loss, net of tax	(111)	(23)	(49)	(221)
Total comprehensive income	265	319	681	448
Less: amounts attributable to noncontrolling interests:
Net income	(6)	(5)	(13)	(10)
Unrealized foreign currency translation adjustments	5	0	2	5
Comprehensive income attributable to PPG	$ 264	$ 314	$ 670	$ 443