Financial Instruments, Hedging Activities and Fair Value Measurements (Additional Information) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 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
Fair value of foreign currency forward contracts designated as cash flow hedges, net asset	$ 11	$ 13
Notional amount	560
Fair value of nine U.S. dollar to euro cross currency swap contracts	42	65
Fair Value of Debt Instrument Designated as a Hedge of Net Investment in Foreign Operations	3,200	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	187	482
Capital Lease Obligations	16	18
Short-term Debt	44	99
Long-term Debt	4,557	4,299
Long-lived assets fair value amount	4,746	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	$ 2,800