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Borrowings and Lines of Credit (Additional Information) (Detail) (USD $)
12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Jul. 30, 2012
Extinguishment of Debt [Line Items]          
Aggregate maturities of long-term debt, in 2013 $ 366,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths        
Aggregate maturities of long-term debt, in 2014 253,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo        
Aggregate maturities of long-term debt, in 2015 608,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree        
Aggregate maturities of long-term debt, in 2016 127,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour        
Aggregate maturities of long-term debt, in 2017 303,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive        
Repayments of debt 1,489,000,000us-gaap_RepaymentsOfDebt 605,000,000us-gaap_RepaymentsOfDebt 71,000,000us-gaap_RepaymentsOfDebt    
Hypothetical rate on the credit agreement 0.57%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd        
Unused capacity, commitment fee percentage 0.10%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage 0.10%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage      
Ratio of Indebtedness to Net Capital 0.38us-gaap_RatioOfIndebtednessToNetCapital1        
Derivative, Cash Paid on Settlement of Hedge         121,000,000ppg_DerivativeCashPaidOnSettlementOfHedge
Effective interest rates 3.90%us-gaap_DebtInstrumentInterestRateEffectivePercentage 4.10%us-gaap_DebtInstrumentInterestRateEffectivePercentage      
Repayments of assumed debt 314,000,000us-gaap_RepaymentsOfAssumedDebt 0us-gaap_RepaymentsOfAssumedDebt 119,000,000us-gaap_RepaymentsOfAssumedDebt    
Interest paid, net of amount capitalized 218,000,000us-gaap_InterestPaid 201,000,000us-gaap_InterestPaid 219,000,000us-gaap_InterestPaid    
Agreement with a counterparty to repurchase Company stock 3,813,191us-gaap_StockRepurchasedDuringPeriodShares 5,745,529us-gaap_StockRepurchasedDuringPeriodShares 1,000,000us-gaap_StockRepurchasedDuringPeriodShares    
Rental expenses for operating leases 284,000,000us-gaap_LeaseAndRentalExpense 256,000,000us-gaap_LeaseAndRentalExpense 209,000,000us-gaap_LeaseAndRentalExpense    
Outstanding letters of credit and surety bonds 120,000,000ppg_LettersOfCreditSuretyBondsAndOtherArrangements 110,000,000ppg_LettersOfCreditSuretyBondsAndOtherArrangements      
Guarantees outstanding 25,000,000us-gaap_GuarantyAssets 51,000,000us-gaap_GuarantyAssets      
Notes 6.875 Percent Due 2017          
Extinguishment of Debt [Line Items]          
Debt instrument, interest rate, stated percentage 6.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ppg_Notes6875PercentDue2017Member
       
Notes 2.70 Percent Due 2022          
Extinguishment of Debt [Line Items]          
Debt instrument, interest rate, stated percentage 2.70%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ppg_Notes270PercentDue2022Member
       
Guarantee of Indebtedness of Others          
Extinguishment of Debt [Line Items]          
Related parties, carrying value 1,000,000us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_GuaranteeOfIndebtednessOfOthersMember
1,000,000us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_GuaranteeOfIndebtednessOfOthersMember
     
Related parties, fair value 2,000,000us-gaap_GuaranteesFairValueDisclosure
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_GuaranteeOfIndebtednessOfOthersMember
3,000,000us-gaap_GuaranteesFairValueDisclosure
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_GuaranteeOfIndebtednessOfOthersMember
     
International Operations          
Extinguishment of Debt [Line Items]          
Line of Credit Facility, Current Borrowing Capacity 723,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_StatementBusinessSegmentsAxis
= ppg_InternationalOperationsMember
       
Line of Credit Facility, Amount Outstanding 160,000,000us-gaap_LineOfCredit
/ us-gaap_StatementBusinessSegmentsAxis
= ppg_InternationalOperationsMember
       
Commodity Chemicals Segment          
Extinguishment of Debt [Line Items]          
Rental expenses for operating leases 1,000,000us-gaap_LeaseAndRentalExpense
/ us-gaap_StatementBusinessSegmentsAxis
= ppg_CommodityChemicalsSegmentMember
10,000,000us-gaap_LeaseAndRentalExpense
/ us-gaap_StatementBusinessSegmentsAxis
= ppg_CommodityChemicalsSegmentMember
25,000,000us-gaap_LeaseAndRentalExpense
/ us-gaap_StatementBusinessSegmentsAxis
= ppg_CommodityChemicalsSegmentMember
   
Notes Five Point Seven Five Percent Due Twenty Thirteen [Member]          
Extinguishment of Debt [Line Items]          
Repayments of debt       600,000,000us-gaap_RepaymentsOfDebt
/ us-gaap_DebtInstrumentAxis
= ppg_NotesFivePointSevenFivePercentDueTwentyThirteenMember
 
Credit Agreement          
Extinguishment of Debt [Line Items]          
Debt instrument, term 5 years 5 years      
Revolving Credit Facility | Credit Agreement          
Extinguishment of Debt [Line Items]          
Revolving credit facility outstanding 1,500,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= ppg_CreditAgreementMember
       
Line of credit facility, additional borrowing capacity available to lender conditions 300,000,000ppg_LineOfCreditFacilityAdditionalBorrowingCapacityAvailableToLenderConditions
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= ppg_CreditAgreementMember
       
Minimum          
Extinguishment of Debt [Line Items]          
Unused capacity, commitment fee percentage   0.08%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Debt Instrument, Periodic Payment $ 10,000,000us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
       
Maximum          
Extinguishment of Debt [Line Items]          
Unused capacity, commitment fee percentage   0.225%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Maximum | Revolving Credit Facility | Credit Agreement          
Extinguishment of Debt [Line Items]          
Total indebtedness to total capitalization ratio requirement 60.00%ppg_DebtInstrumentTotalIndebtednessToTotalCapitalizationRatioRequirement
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= ppg_CreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember