Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income attributable to the controlling and noncontrolling interests	$ 1,592	$ 1,149	$ 1,309
Defined benefit pension and other postretirement benefit adjustments	(17)	36	63
Unrealized foreign currency translation adjustments	950	(916)	509
Other comprehensive income/(loss), net of tax	933	(880)	572
Total comprehensive income	2,525	269	1,881
Less: amounts attributable to noncontrolling interests:
Net income	(16)	(33)	(39)
Unrealized foreign currency translation adjustments	(1)	11	(1)
Comprehensive income attributable to PPG	$ 2,508	$ 247	$ 1,841