Condensed Consolidated Statement of Comprehensive Income/(Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income attributable to controlling and noncontrolling interests	$ 474	$ 436	$ 1,420	$ 1,206
Other comprehensive (loss)/income, net of tax:
Defined benefit pension and other postretirement benefits	(3)	(1)	17	138
Unrealized foreign currency translation adjustments	(113)	(174)	(561)	199
Other comprehensive (loss)/income, net of tax	(116)	(175)	(544)	337
Total comprehensive income	358	261	876	1,543
Less: amounts attributable to noncontrolling interests:
Net income	(6)	(10)	(24)	(26)
Unrealized foreign currency translation adjustments	(1)	2	3	1
Comprehensive income attributable to PPG	$ 351	$ 253	$ 855	$ 1,518