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Stock-Based Compensation (Additional Information) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grants under the PPG Omnibus Plan 7,700,000   7,700,000  
Stock-based compensation expense $ 8 $ 16 $ 24 $ 26
Total income tax benefit recognized related to the stock-based compensation $ 2 $ 5 $ 8 $ 9
Stock options granted from the PPG Omnibus Plan     590,058 719,969
Stock options granted from the PPG Omnibus Plan, weighted average fair value per share (in usd per share)     $ 21.15 $ 17.89
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     215,105 242,525
RSUs granted, weighted average fair value per share (in usd per share)     $ 97.48 $ 91.37
Award vesting period (in years)     3 years  
Stock Compensation Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSUs granted     57,817 57,910
RSUs granted, weighted average fair value per share (in usd per share)     $ 110.20 $ 95.00
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 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options exercisable period     36 months