Condensed Consolidated Statement of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
Net sales	$ 4,195	$ 4,235	$ 7,879	$ 8,084
Cost of sales, exclusive of depreciation and amortization	2,432	2,450	4,574	4,655
Selling, general and administrative	872	858	1,710	1,708
Depreciation	102	89	191	184
Amortization	33	35	65	70
Research and development, net	106	108	208	215
Interest expense	62	62	118	117
Interest income	(44)	(45)	(87)	(87)
Other charges, net	34	27	0	29
Income before income taxes	598	651	1,100	1,193
Income tax expense	140	149	262	277
Income from continuing operations	458	502	838	916
Income/(loss) from discontinued operations, net of tax	0	35	(2)	30
Net income attributable to the controlling and noncontrolling interests	458	537	836	946
Net income attributable to noncontrolling interests	8	9	13	18
Net income (attributable to PPG)	450	528	823	928
Income from continuing operations, net of tax	450	493	825	898
Income/(loss) from discontinued operations, net of tax	$ 0	$ 35	$ (2)	$ 30
Earnings per common share:
Income from continuing operations, net of tax (in dollars per share)	$ 1.98	$ 2.10	$ 3.63	$ 3.82
Loss from discontinued operations, net of tax (in dollars per share)	0	0.15	(0.01)	0.13
Earnings per common share (attributable to PPG) (in dollars per share)	1.98	2.25	3.62	3.95
Earnings per common share – assuming dilution:
Income from continuing operations, net of tax (in dollars per share)	1.98	2.09	3.61	3.80
Loss from discontinued operations, net of tax (in dollars per share)	0	0.15	(0.01)	0.13
Earnings per common share (attributable to PPG) - assuming dilution (in dollars per share)	$ 1.98	$ 2.24	$ 3.60	$ 3.93