Condensed Consolidated Statement of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Income Statement [Abstract]
Net sales	$ 3,684	$ 3,849
Cost of sales, exclusive of depreciation and amortization	2,142	2,205
Selling, general and administrative	838	850
Depreciation	89	95
Amortization	32	35
Research and development, net	102	107
Interest expense	56	55
Interest income	(43)	(42)
Other (income)/charges, net	(34)	2
Income before income taxes	502	542
Income tax expense	122	128
Income from continuing operations	380	414
Loss from discontinued operations, net of tax	(2)	(5)
Net income attributable to the controlling and noncontrolling interests	378	409
Net income attributable to noncontrolling interests	5	9
Net income (attributable to PPG)	373	400
Income from continuing operations, net of tax	375	405
Loss from discontinued operations, net of tax	$ (2)	$ (5)
Earnings per common share:
Income from continuing operations, net of tax (in dollars per share)	$ 1.64	$ 1.72
Loss from discontinued operations, net of tax (in dollars per share)	(0.01)	(0.02)
Earnings per common share (attributable to PPG) (in dollars per share)	1.63	1.70
Earnings per common share – assuming dilution:
Income from continuing operations, net of tax (in dollars per share)	1.64	1.71
Loss from discontinued operations, net of tax (in dollars per share)	(0.01)	(0.02)
Earnings per common share (attributable to PPG) - assuming dilution (in dollars per share)	$ 1.63	$ 1.69