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Working Capital Detail (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Disclosure Components Of Working Capital Detail [Abstract]    
Trade - net $ 2,366us-gaap_AccountsReceivableNetCurrent $ 2,449us-gaap_AccountsReceivableNetCurrent
Equity affiliates 10ppg_ReceivablesFromAffiliates 10ppg_ReceivablesFromAffiliates
Other - net 439us-gaap_AccountsAndOtherReceivablesNetCurrent 277us-gaap_AccountsAndOtherReceivablesNetCurrent
Receivables 2,815us-gaap_ReceivablesNetCurrent 2,736us-gaap_ReceivablesNetCurrent
Finished products 1,169us-gaap_InventoryFinishedGoods 1,156us-gaap_InventoryFinishedGoods
Work in process 157us-gaap_InventoryWorkInProcess 160us-gaap_InventoryWorkInProcess
Raw materials 439us-gaap_InventoryRawMaterials 440us-gaap_InventoryRawMaterials
Supplies 60us-gaap_OtherInventorySupplies 68us-gaap_OtherInventorySupplies
Total inventory at LIFO 1,825us-gaap_InventoryNet 1,824us-gaap_InventoryNet
Trade 1,919us-gaap_AccountsPayableTradeCurrent 1,790us-gaap_AccountsPayableTradeCurrent
Accrued payroll 497us-gaap_AccruedSalariesCurrent 506us-gaap_AccruedSalariesCurrent
Customer rebates 264ppg_RebatesPayableCurrent 225ppg_RebatesPayableCurrent
Other postretirement and pension benefits 94us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities 93us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities
Income taxes 62us-gaap_AccruedIncomeTaxesCurrent 80us-gaap_AccruedIncomeTaxesCurrent
Other 712us-gaap_OtherAccountsPayableAndAccruedLiabilities 571us-gaap_OtherAccountsPayableAndAccruedLiabilities
Accounts payable and accrued liabilities $ 3,548us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent $ 3,265us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent