Acquisitions and Dispositions (Additional Information) (Details) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2015 USD ($) employees distribution_center sites	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Sep. 30, 2015 USD ($) employees distribution_center sites	Sep. 30, 2014 USD ($)
Business Acquisition [Line Items]
Business acquisitions, net of cash balances acquired					$ 248	$ 114
Net sales reported by PPG from business acquired	$ 200				630
Proceed from separation of business				$ 1,735
After-tax proceeds from divestiture of business				1,500
Net gain from divestiture of PPG's interest in the Transitions Optical joint venture and sunlens business				1,468
Net gain from separation and merger of commodity chemicals business after tax				946
Tax expense on the sale				522
Discontinued operations tax on disposal - deferred portion				262
Discontinued operations, transactions costs incurred in divestiture				$ 55
Term of dye supply agreement				5 years
Sunlens Optical Business [Member]
Business Acquisition [Line Items]
Ownership percentage				100.00%
Transitions Optical Business [Member]
Business Acquisition [Line Items]
Ownership percentage				51.00%
Net gain from divestiture of PPG's interest in the Transitions Optical joint venture and sunlens business	$ 0		$ 0		$ 0	1,468
Comex [Member]
Business Acquisition [Line Items]
Business acquisitions, net of cash balances acquired		$ 1,950
Consideration transferred		69
Number of concessionaires	700				700
Number of stores	3,900				3,900
Number of employees | employees	3,900				3,900
Manufacturing facilities | sites	8				8
Number of distribution centers | distribution_center	6				6
Reduction to goodwill					$ 13
Weighted average useful life of identifiable intangible assets					24 years
Revenue reported for the last annual period of a business to be acquired.			$ 4,138			$ 12,227
Comex acquisition [Member]
Business Acquisition [Line Items]
Repayment of acquired debt		$ 280
Consorcio Latinoamericano [Member]
Business Acquisition [Line Items]
Number of stores	57				57
Company-owned stores	87				87
REVOCOAT [Member]
Business Acquisition [Line Items]
Number of research and development centers	1				1
Number of employees | employees	500				500
Manufacturing facilities | sites	8				8
Other Acquisitions [Member]
Business Acquisition [Line Items]
Cash Acquired from Acquisition					$ 130
Business acquisitions, net of cash balances acquired					$ 274