Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income attributable to the controlling and noncontrolling interests	$ 1,309	$ 1,054	$ 1,460
Defined benefit pension and other postretirement benefit adjustments	63	206	174
Unrealized foreign currency translation adjustments	509	(279)	(330)
Other comprehensive income/(loss), net of tax	572	(73)	(156)
Total comprehensive income	1,881	981	1,304
Less: amounts attributable to noncontrolling interests:
Net income	(39)	(28)	(21)
Unrealized foreign currency translation adjustments	(1)	13	5
Comprehensive income attributable to PPG	$ 1,841	$ 966	$ 1,288