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Investments (Tables)
9 Months Ended
Sep. 30, 2012
Equity Method Investments and Joint Ventures [Abstract]  
Schedule of Variable Interest Entities
The following table summarizes PPG’s maximum exposure to loss associated with RS Cogen.
 
(Millions)
 
Investment in and advances to RS Cogen
$
19

Take-or-pay obligation under power tolling arrangement through 2022
236

Maximum exposure to loss as of September 30, 2012
$
255