Condensed Consolidated Statement of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Net sales	$ 4,644	$ 4,468	$ 13,896	$ 13,467
Cost of sales, exclusive of depreciation and amortization	2,752	2,821	8,214	8,473
Selling, general and administrative	1,047	931	3,108	2,887
Depreciation	102	95	287	296
Amortization	40	40	121	125
Research and development, net	108	110	322	340
Interest expense	64	46	190	114
Interest income	(39)	(14)	(96)	(34)
Impairment and other related charges, net	0	0	0	230
Pension settlement charge	0	0	190	0
Other charges/(income), net	13	21	4	(26)
Income before income taxes	557	418	1,556	1,062
Income tax expense	121	79	350	252
Income from continuing operations	436	339	1,206	810
Loss from discontinued operations, net of tax	0	0	0	(2)
Net income attributable to the controlling and noncontrolling interests	436	339	1,206	808
Net income attributable to noncontrolling interests	10	10	26	20
Net income (attributable to PPG)	426	329	1,180	788
Income from continuing operations, net of tax	426	329	1,180	790
Loss from discontinued operations, net of tax	$ 0	$ 0	$ 0	$ (2)
Income from continuing operations (in dollars per share)	$ 1.80	$ 1.40	$ 5.00	$ 3.34
Loss from discontinued operations (in dollars per share)	0	0	0	(0.01)
Earnings per common share (attributable to PPG) (in dollars per share)	1.80	1.40	5.00	3.33
Income from continuing operations, per diluted share (in dollars per share)	1.79	1.39	4.97	3.33
Loss from discontinued operations, per diluted share (in dollars per share)	0	0	0	(0.01)
Earnings per common share (attributable to PPG) - assuming dilution (in dollars per share)	$ 1.79	$ 1.39	$ 4.97	$ 3.32