Condensed Consolidated Statement of Income (Calculation) (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]
Income from continuing operations, net of tax	$ 439	$ 450	$ 821	$ 825
Loss from discontinued operations, net of tax	(2)	0	(2)	(2)
Net income (attributable to PPG)	$ 437	$ 450	$ 819	$ 823