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Stock-Based Compensation (Additional Information) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grants under the PPG Omnibus Plan 4,600,000   4,600,000  
Stock-based compensation expense $ 12 $ 18 $ 18 $ 35
Total income tax benefit recognized related to the stock-based compensation $ 3 $ 4 $ 4 $ 8
Stock options granted from the PPG Omnibus Plan     487,277 527,464
Stock options granted from the PPG Omnibus Plan, weighted average fair value per share (in usd per share)     $ 36.52 $ 29.27
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     211,914 185,084
RSUs granted, weighted average fair value per share (in usd per share)     $ 142.17 $ 132.63
Award vesting period (in years)     3 years  
Stock Compensation Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSUs granted     57,134 55,540
RSUs granted, weighted average fair value per share (in usd per share)     $ 151.87 $ 136.60
Minimum [Member] | 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 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options exercisable period     36 months  
Maximum [Member] | 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%