Condensed Consolidated Statement of Comprehensive Income/(Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income attributable to controlling and noncontrolling interests	$ 339	$ 345	$ 808	$ 1,163
Other comprehensive loss, net of tax:
Defined benefit pension and other postretirement benefits	2	6	11	(1)
Unrealized foreign currency translation adjustments	(353)	(215)	(543)	(276)
Other comprehensive loss, net of tax	(351)	(209)	(532)	(277)
Total comprehensive (loss)/income	(12)	136	276	886
Less: amounts attributable to noncontrolling interests:
Net income	(10)	(1)	(20)	(10)
Unrealized foreign currency translation adjustments	7	2	16	5
Comprehensive (loss)/income attributable to PPG	$ (15)	$ 137	$ 272	$ 881