Condensed Consolidated Statement of Comprehensive Income/(Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Statement of Comprehensive Income [Abstract]
Net income/(loss) attributable to the controlling and noncontrolling interests	$ 440	$ 458	$ 825	$ 836
Other comprehensive (loss)/income, net of tax:
Defined benefit pension and other postretirement benefits	(5)	(2)	(7)	(7)
Unrealized foreign currency translation adjustments	127	498	121	779
Other comprehensive income, net of tax:	122	496	114	772
Total comprehensive income	562	954	939	1,608
Less: amounts attributable to noncontrolling interests:
Net income	(3)	(8)	(6)	(13)
Unrealized foreign currency translation adjustments	0	(5)	6	(6)
Comprehensive income attributable to PPG	$ 559	$ 941	$ 939	$ 1,589