Condensed Consolidated Statement of Comprehensive Income/(Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income attributable to controlling and noncontrolling interests	$ 537	$ 497	$ 946	$ 770
Other comprehensive (loss)/income, net of tax:
Defined benefit pension and other postretirement benefits	20	0	20	139
Unrealized foreign currency translation adjustments	(434)	109	(448)	373
Other comprehensive (loss)/income, net of tax	(414)	109	(428)	512
Total comprehensive income	123	606	518	1,282
Less: amounts attributable to noncontrolling interests:
Net income	(9)	(7)	(18)	(16)
Unrealized foreign currency translation adjustments	2	0	4	(1)
Comprehensive income attributable to PPG	$ 116	$ 599	$ 504	$ 1,265