Condensed Consolidated Statement of Comprehensive Income/(Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income attributable to controlling and noncontrolling interests	$ 436	$ 339	$ 1,206	$ 808
Other comprehensive (loss)/income, net of tax:
Defined benefit pension and other postretirement benefits	(1)	2	138	11
Unrealized foreign currency translation adjustments	(174)	(353)	199	(543)
Other comprehensive (loss)/income, net of tax	(175)	(351)	337	(532)
Total comprehensive income/(loss)	261	(12)	1,543	276
Less: amounts attributable to noncontrolling interests:
Net income	(10)	(10)	(26)	(20)
Unrealized foreign currency translation adjustments	2	7	1	16
Comprehensive income/(loss) attributable to PPG	$ 253	$ (15)	$ 1,518	$ 272