Condensed Consolidated Statement of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Income Statement [Abstract]
Net sales	$ 4,082	$ 4,032	$ 11,961	$ 12,116
Cost of sales, exclusive of depreciation and amortization	2,426	2,381	7,000	7,036
Selling, general and administrative	824	848	2,534	2,556
Depreciation	106	89	297	273
Amortization	32	30	97	100
Research and development, net	106	102	314	317
Interest expense	65	67	183	184
Interest income	(42)	(48)	(129)	(135)
Other charges/(income), net	9	(15)	9	14
Income before income taxes	556	578	1,656	1,771
Income tax expense	118	128	380	405
Income from continuing operations	438	450	1,276	1,366
Income from discontinued operations, net of tax	9	24	7	54
Net income/(loss) attributable to the controlling and noncontrolling interests	447	474	1,283	1,420
Net loss/(income) attributable to noncontrolling interests	(6)	6	7	24
Net income (attributable to PPG)	453	468	1,276	1,396
Income from continuing operations, net of tax	444	444	1,269	1,342
Income from discontinued operations, net of tax	$ 9	$ 24	$ 7	$ 54
Earnings per common share:
Income from continuing operations, net of tax (in dollars per share)	$ 1.97	$ 1.91	$ 5.59	$ 5.73
Loss from discontinued operations, net of tax (in dollars per share)	0.04	0.10	0.03	0.23
Earnings per common share (attributable to PPG) (in dollars per share)	2.01	2.01	5.62	5.96
Earnings per common share – assuming dilution:
Income from continuing operations, net of tax (in dollars per share)	1.96	1.90	5.57	5.70
Loss from discontinued operations, net of tax (in dollars per share)	0.04	0.10	0.03	0.23
Earnings per common share (attributable to PPG) - assuming dilution (in dollars per share)	$ 2.00	$ 2.00	$ 5.60	$ 5.93