Acquisitions and Dispositions (Pro Forma Information) (Details) (Consorcio Comex, S.A. de C.V. [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2014
Consorcio Comex, S.A. de C.V. [Member]
Business Acquisition [Line Items]
Revenue reported for the last annual period of a business to be acquired.	$ 3,810

Revenue reported for the last annual period of a business to be acquired.

No definition available.

Name:	ppg_Revenuereportedforthelastannualperiodofabusinesstobeacquired.
Namespace Prefix:	ppg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration