Stock-Based Compensation (Additional Information) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 8	$ 9	$ 42	$ 27
Total income tax benefit recognized related to the stock-based compensation	$ 2	$ 2	$ 9	$ 6
Stock options granted from the PPG Omnibus Plan			410,001	487,277
Stock options granted from the PPG Omnibus Plan, weighted average fair value per share (in usd per share)			$ 38.55	$ 36.52
Maximum term of the outstanding stock options for the PPG Omnibus Plan and the PPG Stock Plan for certain employees			10 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted			289,573	223,729
RSUs granted, weighted average fair value per share (in usd per share)			$ 125.79	$ 141.50
Award vesting period (in years)			3 years
Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted			52,389	57,134
RSUs granted, weighted average fair value per share (in usd per share)			$ 129.03	$ 151.87
Minimum | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Target Award			0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable period			36 months
Maximum | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Target Award			200.00%