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Stock-Based Compensation (Additional Information) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grants under the PPG Omnibus Plan 7,200,000   7,200,000  
Stock-based compensation expense $ 10 $ 9 $ 19 $ 18
Total income tax benefit recognized related to the stock-based compensation $ 2 $ 2 $ 4 $ 4
Stock options granted from the PPG Omnibus Plan     588,870 532,705
Stock options granted from the PPG Omnibus Plan, weighted average fair value per share (in usd per share)     $ 22.50 $ 25.27
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     208,602 230,363
RSUs granted, weighted average fair value per share (in usd per share)     $ 104.46 $ 107.73
Award vesting period (in years)     3 years  
Stock Compensation Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSUs granted     51,850 52,450
RSUs granted, weighted average fair value per share (in usd per share)     $ 109.74 $ 115.64
Executive Officer Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Period for recognizing compensation costs (in years)     3 years  
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options exercisable period     36 months