Borrowings (Details) € in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2016 EUR (€)	Jun. 30, 2015 USD ($)	Jun. 30, 2015 EUR (€)	Jun. 30, 2015 EUR (€)
Schedule of Held-to-maturity Securities [Line Items]
Euro-denominated borrowings hedging a portion of PPG's net investment in European operations				€ 300
Repayments of Debt | $	$ 252		$ 338
Debt Instrument, Face Amount			1,260		€ 1,200
Proceeds from Notes Payable | $			1,240
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
Proceeds from Notes Payable | $			$ 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%	1.90%
Seven-year Fixed Rate Euro Bank Loan Due 2022 [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Instrument, Face Amount					€ 600
Stated interest rate			0.875%		0.875%
Twelve-year Fixed Rate Euro Bank Loan Due 2027 [Member] [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Instrument, Face Amount					€ 600
Stated interest rate			1.40%		1.40%
Net Investment Hedging [Member]
Schedule of Held-to-maturity Securities [Line Items]
Repayments of Debt | $			$ 336