Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income attributable to the controlling and noncontrolling interests	$ 1,460	$ 1,074	$ 1,269
Defined benefit pension and other postretirement benefit adjustments	174	(213)	(156)
Unrealized foreign currency translation adjustments	(330)	(36)	106
Derivative financial instruments			(1)
Other comprehensive loss, net of tax	(156)	(249)	(51)
Total comprehensive income	1,304	825	1,218
Less: amounts attributable to noncontrolling interests:
Net income	(21)	(15)	(26)
Unrealized foreign currency translation adjustments	5		1
Comprehensive income attributable to PPG	$ 1,288	$ 810	$ 1,193