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	Noncontrolling Interests
Beginning balance at Dec. 31, 2019	$ 5,403	$ 969	$ 950	$ 18,906	$ (13,191)	$ (2,350)	$ 5,284	$ 119
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to the controlling and noncontrolling interests	1,074			1,059			1,059	15
Other comprehensive loss, net of tax	(249)					(249)	(249)
Cash dividends	(496)			(496)			(496)
Issuance of treasury stock	78		45		33		78
Stock-based compensation activity	13		13				13
Dividends paid on subsidiary common stock to noncontrolling interests	(4)							(4)
Reductions in noncontrolling interests	(4)							(4)
Ending balance at Dec. 31, 2020	5,815	969	1,008	19,469	(13,158)	(2,599)	5,689	126
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to the controlling and noncontrolling interests	1,460			1,439			1,439	21
Other comprehensive loss, net of tax	(156)					(151)	(151)	(5)
Cash dividends	(536)			(536)			(536)
Purchase of treasury stock	(250)				(250)		(250)
Issuance of treasury stock	70		48		22		70
Stock-based compensation activity	25		25				25
Dividends paid on subsidiary common stock to noncontrolling interests	(6)							(6)
Reductions in noncontrolling interests	(11)							(11)
Ending 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)
Reductions in noncontrolling interests	(10)							(10)
Other	3	0	3	0	0	0	3	0
Ending balance at Dec. 31, 2022	$ 6,709	$ 969	$ 1,130	$ 20,828	$ (13,525)	$ (2,810)	$ 6,592	$ 117