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Investments	3 Months Ended
Investments	Mar. 31, 2013
Equity Method Investments and Joint Ventures [Abstract]
Investments	Investments Until January 28, 2013, PPG had a 50 percent ownership interest in RS Cogen, L.L.C., which toll produced electricity and steam that were primarily sold to PPG's former Lake Charles, La. commodity chemicals facility and its joint venture partner under take-or-pay contracts with terms that extended to 2022. PPG’s purchases of electricity and steam from the joint venture for the years ended December 31, 2012, 2011 and 2010 were $25 million, $23 million and $23 million, respectively. During the first quarter 2013, PPG's ownership interest in RS Cogen, L.L.C. and its future purchase obligations under the take-or-pay commitments were transferred with the assets of the commodity chemicals business in the Transaction. Refer to Note 5 for additional information related to this transaction.

The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group.

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