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Financial Instruments, Excluding Derivative Financial Instruments	6 Months Ended
	Jun. 30, 2013
Financial Instruments Excluding Derivative Financial Instruments Disclosure [Abstract]
Financial Instruments, Excluding Derivative Financial Instruments	Financial Instruments, Excluding Derivative Financial Instruments Included in PPG’s financial instrument portfolio are cash and cash equivalents, short-term investments, cash held in escrow, marketable equity securities, company-owned life insurance and short and long-term debt instruments. The fair values of these financial instruments approximated their carrying values at June 30, 2013 and December 31, 2012, in the aggregate, except for long-term debt. Long-term debt (excluding capital lease obligations) had carrying and fair values totaling $3,327 million and $3,693 million, respectively, as of June 30, 2013. Long-term debt (excluding capital lease obligations) had carrying and fair values totaling $3,939 million and $4,484 million, respectively, as of December 31, 2012. The fair values of the debt instruments were based on discounted cash flows and interest rates then currently available to the Company for instruments of the same remaining maturities. The fair value of debt is measured using level 2 inputs.