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Borrowings and Lines of Credit (Short-term Debt Outstanding) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Short-term Debt [Line Items]    
Total $ 115us-gaap_ShortTermBorrowings $ 30us-gaap_ShortTermBorrowings
Other Short-Term Borrowings    
Short-term Debt [Line Items]    
Other Short-term Borrowings $ 115us-gaap_OtherShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= ppg_OtherShortTermBorrowingsMember		 $ 30us-gaap_OtherShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= ppg_OtherShortTermBorrowingsMember
Various, weighted average 3.55% as of Dec. 31, 2013 and 2.27% as of December 31, 2012 2.52%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= ppg_OtherShortTermBorrowingsMember		 3.55%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= ppg_OtherShortTermBorrowingsMember