Condensed Consolidated Statement of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Income Statement [Abstract]
Net sales	$ 4,495	$ 4,195	$ 8,425	$ 7,879
Cost of sales, exclusive of depreciation and amortization	2,687	2,432	4,962	4,574
Selling, general and administrative	931	872	1,816	1,710
Depreciation	108	102	213	191
Amortization	26	33	53	65
Research and development, net	107	106	220	208
Interest expense	71	62	132	118
Interest income	(42)	(44)	(79)	(87)
Other charges, net	38	34	22	0
Income before income taxes	569	598	1,086	1,100
Income tax expense	127	140	259	262
Income from continuing operations	442	458	827	838
Loss from discontinued operations, net of tax	(2)	0	(2)	(2)
Net income/(loss) attributable to the controlling and noncontrolling interests	440	458	825	836
Net income attributable to noncontrolling interests	3	8	6	13
Net income (attributable to PPG)	437	450	819	823
Income from continuing operations, net of tax	439	450	821	825
Loss from discontinued operations, net of tax	$ (2)	$ 0	$ (2)	$ (2)
Earnings per common share:
Income from continuing operations, net of tax (in dollars per share)	$ 1.97	$ 1.98	$ 3.68	$ 3.63
Loss from discontinued operations, net of tax (in dollars per share)	(0.01)	0	(0.01)	(0.01)
Earnings per common share (attributable to PPG) (in dollars per share)	1.96	1.98	3.67	3.62
Earnings per common share – assuming dilution:
Income from continuing operations, net of tax (in dollars per share)	1.96	1.98	3.66	3.61
Loss from discontinued operations, net of tax (in dollars per share)	(0.01)	0	(0.01)	(0.01)
Earnings per common share (attributable to PPG) - assuming dilution (in dollars per share)	$ 1.95	$ 1.98	$ 3.65	$ 3.60