Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income attributable to the controlling and noncontrolling interests	$ 1,149	$ 1,309	$ 1,054
Defined benefit pension and other postretirement benefit adjustments	36	63	206
Unrealized foreign currency translation adjustments	(916)	509	(279)
Other comprehensive (loss)/income, net of tax	(880)	572	(73)
Total comprehensive income	269	1,881	981
Less: amounts attributable to noncontrolling interests:
Net income	(33)	(39)	(28)
Unrealized foreign currency translation adjustments	11	(1)	13
Comprehensive income attributable to PPG	$ 247	$ 1,841	$ 966