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Income Taxes (Additional Information) (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
jurisdiction
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Taxes [Line Items]        
Income tax expense $ 259,000,000us-gaap_IncomeTaxExpenseBenefit $ 253,000,000us-gaap_IncomeTaxExpenseBenefit $ 148,000,000us-gaap_IncomeTaxExpenseBenefit  
Income before income taxes of non-US operations 1,416,000,000ppg_IncomeLossFromContinuingOperationsBeforeIncomeTaxes 1,226,000,000ppg_IncomeLossFromContinuingOperationsBeforeIncomeTaxes 828,000,000ppg_IncomeLossFromContinuingOperationsBeforeIncomeTaxes  
Taxes paid, net of refunds 642,000,000us-gaap_IncomeTaxesPaid 319,000,000us-gaap_IncomeTaxesPaid 503,000,000us-gaap_IncomeTaxesPaid  
Net operating loss carryforwards 637,000,000us-gaap_OperatingLossCarryforwards 632,000,000us-gaap_OperatingLossCarryforwards    
Tax effected amount of net operating loss carryforward 189,000,000ppg_OperatingLossCarryforwardsTaxEffectedPortion 182,000,000ppg_OperatingLossCarryforwardsTaxEffectedPortion    
Deferred Tax Assets, Tax Credit Carryforwards, Other 191,000,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther 87,000,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther    
Valuation Allowances and Reserves, Balance 87,000,000us-gaap_ValuationAllowancesAndReservesBalance 74,000,000us-gaap_ValuationAllowancesAndReservesBalance 77,000,000us-gaap_ValuationAllowancesAndReservesBalance 71,000,000us-gaap_ValuationAllowancesAndReservesBalance
Undistributed Earnings of Foreign Subsidiaries 5,000,000,000us-gaap_UndistributedEarningsOfForeignSubsidiaries 3,900,000,000us-gaap_UndistributedEarningsOfForeignSubsidiaries    
Number of companies in the proposed new cooperative agreement 200ppg_NumberOfPpgSubsidiaries      
Number of taxable jurisdictions 60ppg_NumberOfTaxableJurisdictions      
Deferred Tax Liabilities, Undistributed Foreign Earnings 263,000,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings      
Potential U.S. tax cost for repatriation of foreign earnings 200,000,000ppg_IncomeTaxPotentialUSTaxCostForRepatriationOfForeignEarnings 250,000,000ppg_IncomeTaxPotentialUSTaxCostForRepatriationOfForeignEarnings    
Unrecognized tax benefits that would affect the effective tax rate, if recognized 67,000,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate      
Accrued estimated interest and penalties on unrecognized tax benefits 7,000,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 9,000,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 10,000,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued  
Recognized (income) expense for estimated interest and penalties 2,000,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 2,000,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 5,000,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense  
U.S.        
Income Taxes [Line Items]        
Income before income taxes of non-US operations 377,000,000ppg_IncomeLossFromContinuingOperationsBeforeIncomeTaxes
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		 447,000,000ppg_IncomeLossFromContinuingOperationsBeforeIncomeTaxes
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		 220,000,000ppg_IncomeLossFromContinuingOperationsBeforeIncomeTaxes
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		  
Non United States        
Income Taxes [Line Items]        
Income before income taxes of non-US operations 1,040,000,000ppg_IncomeLossFromContinuingOperationsBeforeIncomeTaxes
/ us-gaap_IncomeTaxAuthorityAxis
= ppg_NonUnitedStatesMember		 779,000,000ppg_IncomeLossFromContinuingOperationsBeforeIncomeTaxes
/ us-gaap_IncomeTaxAuthorityAxis
= ppg_NonUnitedStatesMember		 608,000,000ppg_IncomeLossFromContinuingOperationsBeforeIncomeTaxes
/ us-gaap_IncomeTaxAuthorityAxis
= ppg_NonUnitedStatesMember		  
Net Operating Loss, Indefinite Life        
Income Taxes [Line Items]        
Net operating loss carryforwards 419,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= ppg_NetOperatingLossIndefiniteLifeMember		 516,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= ppg_NetOperatingLossIndefiniteLifeMember		    
Net Operating Loss, Expiring Between 2012 And 2026        
Income Taxes [Line Items]        
Net operating loss carryforwards 218,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= ppg_NetOperatingLossExpiringWithin20YearsMember		 116,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= ppg_NetOperatingLossExpiringWithin20YearsMember		    
Undistributed earnings, permanently reinvested [Member]        
Income Taxes [Line Items]        
Undistributed Earnings of Foreign Subsidiaries 4,200,000,000us-gaap_UndistributedEarningsOfForeignSubsidiaries
/ ppg_UndistributedearningspermanentlyreinvestedAxis
= ppg_UndistributedearningspermanentlyreinvestedMember		      
Valuation allowance, expected to reverse next 12 months [Member]        
Income Taxes [Line Items]        
Valuation Allowances and Reserves, Balance 40,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= ppg_Valuationallowanceexpectedtoreversenext12monthsMember		      
Foreign tax benefit, prior year [Member]        
Income Taxes [Line Items]        
Income tax expense 29,000,000us-gaap_IncomeTaxExpenseBenefit
/ ppg_ForeigntaxbenefitprioryearAxis
= ppg_ForeigntaxbenefitprioryearMember		      
Transitions Optical Business        
Income Taxes [Line Items]        
Deferred Tax Liabilities, Undistributed Foreign Earnings $ 247,000,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= ppg_TransitionsOpticalBusinessMember