Borrowings (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($)
Long-term Debt [Member]
Schedule of Held-to-maturity Securities [Line Items]
Euro-denominated borrowings hedging a portion of PPG's net investment in European operations	$ 250
Notes 1.900 Percent Due 2016 [Member]
Schedule of Held-to-maturity Securities [Line Items]
Euro-denominated borrowings hedging a portion of PPG's net investment in European operations	$ 250
Stated interest rate	1.90%