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Reportable Segment Information (Additional Information) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Segment
Mar. 31, 2014
Dec. 31, 2014
Segment Reporting Information [Line Items]      
Number of Operating Segments 11us-gaap_NumberOfOperatingSegments    
Environmental remediation costs $ 4us-gaap_EnvironmentalRemediationExpense $ 2us-gaap_EnvironmentalRemediationExpense  
Pension Settlement Charge, Canadian wind-up     $ 2ppg_PensionSettlementChargeCanadianWindUp
Pittsburgh Glass Works LLC [Member]      
Segment Reporting Information [Line Items]      
PPG percent ownership interest 38.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ppg_PittsburghGlassWorksLLCMember