Condensed Consolidated Statement of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Net sales	$ 4,468	$ 4,372	$ 13,467	$ 12,612
Cost of sales, exclusive of depreciation and amortization	2,821	2,733	8,473	7,594
Selling, general and administrative	931	950	2,887	2,796
Depreciation	95	100	296	286
Amortization	40	46	125	126
Research and development, net	110	114	340	323
Interest expense	46	30	114	91
Interest income	(14)	(7)	(34)	(19)
Impairment and other related charges, net	0	21	230	21
Business restructuring, net	36	0	36	(21)
Other income, net	(15)	(56)	(62)	(118)
Income before income taxes	418	441	1,062	1,533
Income tax expense	79	96	252	370
Income from continuing operations	339	345	810	1,163
Loss from discontinued operations, net of tax	0	0	(2)	0
Net income attributable to the controlling and noncontrolling interests	339	345	808	1,163
Net income attributable to noncontrolling interests	10	1	20	10
Net income (attributable to PPG)	329	344	788	1,153
Income from continuing operations, net of tax	329	344	790	1,153
Loss from discontinued operations, net of tax	$ 0	$ 0	$ (2)	$ 0
Income (Loss) from Continuing Operations, Per Basic Share	$ 1.40	$ 1.45	$ 3.34	$ 4.85
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	0	0	(0.01)	0
Earnings per common share (attributable to PPG) (in dollars per share)	1.40	1.45	3.33	4.85
Income (Loss) from Continuing Operations, Per Diluted Share	1.39	1.43	3.33	4.81
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	0	0	(0.01)	0
Earnings per common share (attributable to PPG) - assuming dilution (in dollars per share)	$ 1.39	$ 1.43	$ 3.32	$ 4.81