Condensed Consolidated Statement of Shareholders' Equity (Unaudited) Statement - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss	Total PPG	Non-controlling Interests
Beginning balance at Dec. 31, 2022	$ 6,709	$ 969	$ 1,130	$ 20,828	$ (13,525)	$ (2,810)	$ 6,592	$ 117
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to the controlling and noncontrolling interests	273			264			264	9
Other comprehensive loss, net of tax	403					402	402	1
Cash dividends	(146)			(146)			(146)
Issuance of treasury stock	31		21		10		31
Stock-based compensation activity	(1)		(1)				(1)
Dividends paid on subsidiary common stock to noncontrolling interests	(1)							(1)
Reductions in noncontrolling interests	(15)							(15)
Ending balance at Mar. 31, 2023	7,253	969	1,150	20,946	(13,515)	(2,408)	7,142	111
Beginning balance at Dec. 31, 2023	8,023	969	1,202	21,500	(13,600)	(2,239)	7,832	191
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to the controlling and noncontrolling interests	409			400			400	9
Other comprehensive loss, net of tax	(14)					(12)	(12)	(2)
Cash dividends	(153)			(153)			(153)
Purchase of treasury stock	(152)				(152)		(152)
Issuance of treasury stock	37		31		6		37
Stock-based compensation activity	(11)		(11)				(11)
Dividends paid on subsidiary common stock to noncontrolling interests	(2)							2
Reductions in noncontrolling interests	(11)							(11)
Ending balance at Mar. 31, 2024	$ 8,126	$ 969	$ 1,222	$ 21,747	$ (13,746)	$ (2,251)	$ 7,941	$ 185