Condensed Consolidated Statement of Comprehensive Income/(Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income attributable to controlling and noncontrolling interests	$ 409	$ 273
Other comprehensive (loss)/income, net of tax:
Defined benefit pension and other postretirement benefits	0	139
Unrealized foreign currency translation adjustments	(14)	264
Other comprehensive (loss)/income, net of tax	(14)	403
Total comprehensive income	395	676
Less: amounts attributable to noncontrolling interests:
Net income	(9)	(9)
Unrealized foreign currency translation adjustments	2	(1)
Comprehensive income attributable to PPG	$ 388	$ 666