Stock-Based Compensation (Additional Information) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants under the PPG Omnibus Plan	6,400,000
Total stock-based compensation cost	$ 18	$ 15
Total income tax benefit recognized related to the stock-based compensation	$ 6	$ 5
Maximum term of the outstanding stock options for the PPG Omnibus Plan and the PPG Stock Plan for certain employees	10 years
Options exercisable period, minimum	6 months
Options exercisable period, maximum	48 months
Stock options granted from the PPG Omnibus Plan	357,781	497,711,000,000
Stock options granted from the PPG Omnibus Plan, weighted average fair value per share	$ 43.05	$ 27,370,000.00
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vest period (in years)	3 years
RSUs granted	116,989	152,875,000,000
Executive Officer Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vest period (in years)	3 years