Consolidated Statement of Shareholders' Equity - 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, 2021	$ 6,411	$ 969	$ 1,081	$ 20,372	$ (13,386)	$ (2,750)	$ 6,286	$ 125
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to the controlling and noncontrolling interests	1,054			1,026			1,026	28
Other comprehensive loss, net of tax	(73)					(60)	(60)	(13)
Cash dividends	(570)			(570)			(570)
Purchase of treasury stock	(150)				(150)		(150)
Issuance of treasury stock	47		36		11		47
Stock-based compensation activity	10		10				10
Dividends paid on subsidiary common stock to noncontrolling interests	(13)							(13)
Acquisition of noncontrolling interests	(10)							(10)
Ending 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	1,309			1,270			1,270	39
Other comprehensive loss, net of tax	572					571	571	1
Cash dividends	(598)			(598)			(598)
Purchase of treasury stock	(100)				(100)		(100)
Issuance of treasury stock	83		58		25		83
Stock-based compensation activity	14		14				14
Dividends paid on subsidiary common stock to noncontrolling interests	(21)							(21)
Acquisition of noncontrolling interests	55							55
Ending 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	1,149			1,116			1,116	33
Other comprehensive loss, net of tax	(880)					(869)	(869)	(11)
Cash dividends	(622)			(622)			(622)
Purchase of treasury stock	(759)				(759)		(759)
Issuance of treasury stock	67		50		17		67
Stock-based compensation activity	20		20				20
Dividends paid on subsidiary common stock to noncontrolling interests	(25)							(25)
Acquisition of noncontrolling interests	(11)							(11)
Ending balance at Dec. 31, 2024	$ 6,962	$ 969	$ 1,272	$ 21,994	$ (14,342)	$ (3,108)	$ 6,785	$ 177