Financial Instruments, Hedging Activities and Fair Value Measurements (Additional Information) (Detail) € in Millions, $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2015 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) shares	Dec. 31, 2016 EUR (€)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 EUR (€)	Jun. 30, 2016 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Realization of Unamortized Interest Rate Swap Gain	$ 4
Forward Contract Indexed to Issuer's Equity, Indexed Shares | shares			2,777,778
Forward Contract Indexed To Issuers Equity Shares Principal Amount			$ 60
Interest Paid by PPG to Counter Party		$ 10
Forward Contract Indexed To Issuers Equity Fair Value	223				$ 223		$ 258
Foreign Currency Contracts, Liability, Fair Value Disclosure	44		13		44
Realization of Unamortized Forward Starting Swap Losses	93
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Assets, Fair Value, Net	(41)		(65)		(41)
Notional Amount of Nonderivative Instruments				€ 300	300
Fair Value of Debt Instrument Designated as a Hedge of Net Investment in Foreign Operations	$ 2,000		2,900		2,000
Derivative, Cash Received on Hedge			19		49
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)			482		$ 349
Net Investment Hedging
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Nonderivative Instruments | €				€ 2,800		€ 1,900
Designated as Hedging Instrument [Member] | Foreign Currency Contracts | Cash Flow Hedging | Settlement Date 15 March 2018
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivative Instruments Designated as Net Investment Hedges			$ 560