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Stock-Based Compensation (Additional Information) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock-based compensation expense | $ 12 | $ 17
Total income tax benefit recognized related to the stock-based compensation | $ 2 | $ 4
Stock options granted from the PPG Omnibus Plan | 426,939 | 410,001
Stock options granted from the PPG Omnibus Plan, weighted average fair value per share (in usd per share) | $ 43.83 | $ 38.55
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 | 207,370 | 248,949
RSUs granted, weighted average fair value per share (in usd per share) | $ 137.83 | $ 124.44
Award vesting period (in years) | 3 years |
Stock Compensation Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
RSUs granted | 51,543 | 52,389
RSUs granted, weighted average fair value per share (in usd per share) | $ 142.65 | $ 129.03
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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