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Stock-Based Compensation (Additional Information) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grants under the PPG Omnibus Plan 9,800,000   9,800,000  
Stock-based compensation expense $ 17 $ 25 $ 27 $ 40
Total income tax benefit recognized related to the stock-based compensation $ 6 $ 9 $ 10 $ 14
Stock options granted from the PPG Omnibus Plan     775,319 583,172
Stock options granted from the PPG Omnibus Plan, weighted average fair value per share (in usd per share)     $ 17.89 $ 26.98
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     254,750 193,990
RSUs granted, weighted average fair value per share (in usd per share)     $ 91.37 $ 114.02
Award vesting period (in years)     3 years  
Contingently Issuable Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSUs granted     59,645 63,308
RSUs granted, weighted average fair value per share (in usd per share)     $ 95.00 $ 118.12
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