Condensed Consolidated Statement of Comprehensive Income/(Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income attributable to controlling and noncontrolling interests	$ 446	$ 433	$ 469	$ 818
Other comprehensive (loss)/income, net of tax:
Defined benefit pension and other postretirement benefits	13	(2)	9	(7)
Unrealized foreign currency translation adjustments	(227)	67	(190)	(61)
Other comprehensive (loss)/income, net of tax	(214)	65	(181)	(68)
Total comprehensive income	232	498	288	750
Less: amounts attributable to noncontrolling interests:
Net income	(5)	(2)	(10)	(9)
Unrealized foreign currency translation adjustments	6	1	9	3
Comprehensive income attributable to PPG	$ 233	$ 497	$ 287	$ 744