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, 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
Beginning balance at Dec. 31, 2024	6,962	969	1,272	21,994	(14,342)	(3,108)	6,785	177
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to the controlling and noncontrolling interests	378			373			373	5
Other comprehensive loss, net of tax	276					275	275	1
Cash dividends	(154)			(154)			(154)
Purchase of treasury stock	(385)				(385)		(385)
Issuance of treasury stock	37		29		8		37
Stock-based compensation activity	(4)		(4)				(4)
Dividends paid on subsidiary common stock to noncontrolling interests	(3)							(3)
Reductions in noncontrolling interests	(15)							(15)
Ending balance at Mar. 31, 2025	$ 7,092	$ 969	$ 1,297	$ 22,213	$ (14,719)	$ (2,833)	$ 6,927	$ 165