Shareholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ 4,913	$ 5,069
Net income	$ 506	$ 376	845	730
Other comprehensive income, net of tax	23	(111)	310	(49)
Cash dividends			(205)	(203)
Issuance of treasury stock			49	46
Purchase of treasury stock			(163)	(150)
Stock-based compensation activity			(9)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests			(5)	(10)
Ending balance	5,735	5,433	5,735	5,433
Total PPG Shareholders' Equity [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			4,826	4,983
Net income			835	717
Other comprehensive income, net of tax			297	(47)
Cash dividends			(205)	(203)
Issuance of treasury stock			49	46
Purchase of treasury stock			(163)	(150)
Stock-based compensation activity			(9)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests			0	0
Ending balance	5,630	5,346	5,630	5,346
Non-controlling Interests [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			87	86
Net income			10	13
Other comprehensive income, net of tax			13	(2)
Cash dividends			0	0
Issuance of treasury stock			0	0
Purchase of treasury stock			0	0
Stock-based compensation activity			0
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests			(5)	(10)
Ending balance	$ 105	$ 87	$ 105	$ 87