Stock-Based Compensation (Additional Information) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 23	$ 11
Total income tax benefit recognized related to the stock-based compensation	$ 5	$ 2
Stock options granted from the PPG Omnibus Plan	541,313	426,939
Stock options granted from the PPG Omnibus Plan, weighted average fair value per share (in usd per share)	$ 32.93	$ 43.83
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	254,278	207,370
RSUs granted, weighted average fair value per share (in usd per share)	$ 111.50	$ 137.83
Award vesting period (in years)	3 years
Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted	76,925	51,543
RSUs granted, weighted average fair value per share (in usd per share)	$ 114.39	$ 142.65
Award vesting period (in years)	3 years
Performance Share Payout	100.00%
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%

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Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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