Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income attributable to the controlling and noncontrolling interests	$ 506	$ 376	$ 845	$ 730
Other comprehensive income (loss), net of tax:
Defined benefit pension and other postretirement benefits, net	(55)	24	(34)	43
Unrealized foreign currency translation adjustments	82	(135)	361	(84)
Derivative financial instruments, net	(4)	0	(17)	(8)
Other comprehensive income (loss), net of tax	23	(111)	310	(49)
Total comprehensive income	529	265	1,155	681
Less: amounts attributable to noncontrolling interests:
Net income	(5)	(6)	(10)	(13)
Unrealized foreign currency translation adjustments	(6)	5	(13)	2
Comprehensive income attributable to PPG	$ 518	$ 264	$ 1,132	$ 670