Condensed Consolidated Statement of Comprehensive Income/(Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Net income attributable to controlling and noncontrolling interests	$ 378	$ 409
Other comprehensive income/(loss), net of tax:
Defined benefit pension and other postretirement benefits	(5)	0
Unrealized foreign currency translation adjustments	281	(14)
Other comprehensive income/(loss), net of tax	276	(14)
Total comprehensive income	654	395
Less: amounts attributable to noncontrolling interests:
Net income	(5)	(9)
Unrealized foreign currency translation adjustments	(1)	2
Comprehensive income attributable to PPG	$ 648	$ 388