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Commitments and Contingent Liabilities (Accretion Of Future Funding Obligation) (Detail) (Pittsburgh Corning Corporation, Asbestos Issue, USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Pittsburgh Corning Corporation | Asbestos Issue
  
Accretion For Liability Settlement [Line Items]  
Accretion of asbestos liability 2013 $ 14ppg_AccretionOfInterestOnLitigationSettlementsYearOne
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_AsbestosIssueMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ppg_PittsburghCorningCorporationMember
Accretion of asbestos liability 2014 15ppg_AccretionOfInterestOnLitigationSettlementsYearTwo
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_AsbestosIssueMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ppg_PittsburghCorningCorporationMember
Accretion of asbestos liability 2015-2023 52ppg_AccretionOfInterestOnLitigationSettlementsThereafter
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_AsbestosIssueMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ppg_PittsburghCorningCorporationMember
Accretion of asbestos liability $ 81ppg_AccretionOfInterestOnLitigationSettlements
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_AsbestosIssueMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ppg_PittsburghCorningCorporationMember