Condensed Consolidated Statement of Comprehensive Income/(Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income attributable to the controlling and noncontrolling interests	$ 458	$ 537	$ 836	$ 946
Other comprehensive income/(loss), net of tax:
Defined benefit pension and other postretirement benefits	(2)	20	(7)	20
Unrealized foreign currency translation adjustments	498	(434)	779	(448)
Other comprehensive income/(loss), net of tax	496	(414)	772	(428)
Total comprehensive income	954	123	1,608	518
Less: amounts attributable to noncontrolling interests:
Net income	(8)	(9)	(13)	(18)
Unrealized foreign currency translation adjustments	(5)	2	(6)	4
Comprehensive income attributable to PPG	$ 941	$ 116	$ 1,589	$ 504