Condensed Consolidated Statement of Comprehensive Income/(Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income attributable to controlling and noncontrolling interests	$ 497	$ 446	$ 770	$ 469
Other comprehensive income/(loss), net of tax:
Defined benefit pension and other postretirement benefits	0	13	139	9
Unrealized foreign currency translation adjustments	109	(227)	373	(190)
Other comprehensive income/(loss), net of tax	109	(214)	512	(181)
Total comprehensive income	606	232	1,282	288
Less: amounts attributable to noncontrolling interests:
Net income	(7)	(5)	(16)	(10)
Unrealized foreign currency translation adjustments	0	6	(1)	9
Comprehensive income attributable to PPG	$ 599	$ 233	$ 1,265	$ 287