Financial Instruments, Hedging Activities and Fair Value Measurements (Additional Information) (Details) $ in Millions, € in Billions	9 Months Ended	12 Months Ended
	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 EUR (€)	Jun. 30, 2016 USD ($) shares
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Shares of PPG stock that are to be contributed to the asbestos settlement trust | shares				2,777,778
Forward Contract Indexed To Issuers Equity Fair Value				$ 258
Foreign Currency Contracts, Liability, Fair Value Disclosure	$ 10
Fair value of foreign currency forward contracts designated as cash flow hedges, net asset		$ 13
Notional amount	560
Fair value of nine U.S. dollar to euro cross currency swap contracts	8	65
Fair Value of Debt Instrument Designated as a Hedge of Net Investment in Foreign Operations	3,300	2,900
Accumulated pretax unrealized translation gains (losses) in AOCI, related to both the euro-denominated borrowings and the cross currency swaps that have been designated as hedges of net investments	63	482
Capital Lease Obligations	16	18
Short-term Debt	22	99
Long-term Debt	4,667	4,299
Long-lived assets fair value amount	4,885	$ 4,502
Settlement Date 15 March 2018
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional amount	560
Net Investment Hedging [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Euro-denominated borrowings hedging a portion of PPG's net investment in European operations	$ 2,800		€ 2.8