Financial Instruments, Hedging Activities and Fair Value Measurements (Additional Information) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Shares of PPG stock that are to be contributed to the asbestos settlement trust	2,777,778
Forward Contract Indexed To Issuers Equity Fair Value			$ 258,000,000
Fair value of foreign currency forward contracts designated as cash flow hedges, net asset	$ 7,000,000	$ 13,000,000
Notional amount	560,000,000
Fair value of nine U.S. dollar to euro cross currency swap contracts	77,000,000	65,000,000
Fair Value of Debt Instrument Designated as a Hedge of Net Investment in Foreign Operations	3,000,000,000	2,900,000,000
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	438,000,000	482,000,000
Capital Lease Obligations	18,000,000	18,000,000
Short-term Debt	67,000,000	99,000,000
Long-term Debt	4,336,000,000	4,299,000,000
Long-lived assets fair value amount	4,520,000,000	4,502,000,000
Significant Fair Value Adjustments on Other Assets (Liabilities) Carried at Fair Value		0
Settlement Date 15 March 2018
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional amount	560,000,000
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	$ 2,800,000,000	$ 2,800,000,000