Commitments and Contingent Liabilities (Tables)
 9 Months Ended
Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]  
Litigation Settlements Disclosure
The following table outlines the impact on PPG's financial statements for the nine months ended September 30, 2016 including the change in fair value of the PPG stock contributed to the Trust and the equity forward instrument and the increase in the net present value of the payments made to the trust.
 
Consolidated Balance Sheet
 
 
 
 
 
Asbestos Settlement 
Liability
 
Equity Forward (Asset) Liability
 
Pre-tax
Charge (Income)
 
Cash Outflow
($ in millions)
Current
 
Long-term
 
 
 
Balances as of December 31, 2015
$
796

 
252

 
(223
)
 
—

 
 
2016 Activity
 
 
 
 
 
 
 
 
 
Change in fair value:
 
 
 
 
 
 
 
 
 
PPG stock
34

 
—

 
—

 
34

 
—

Equity forward instrument
—

 
—

 
(35
)
 
(35
)
 
—

Accretion of asbestos liability
—

 
6

 
—

 
6

 
—

Settlement of equity forward instrument with counterparty
—

 
—

 
(49
)
 
—

 
(49
)
Contribution of PCE shares and relinquishment of PC investment
(15
)
 
—

 
—

 
—

 
—

Contribution of 2,777,778 shares of PPG stock to the PC Trust
(308
)
 
—

 
308

 
—

 
—

Contribution of cash to the PC Trust
(506
)
 
(258
)
 
—

 
—

 
(764
)
Reclassifications
(1
)
 
—

 
(1
)
 
—

 
—

Balance as of and Activity for the nine months ended September 30, 2016
$
—

 
$
—

 
$
—

 
$
5

 
$
(813
)
Other Commitments [Line Items]  
Environmental Liabilities [Table Text Block]
As of September 30, 2016 and December 31, 2015, PPG had reserves for environmental contingencies associated with PPG’s former chromium manufacturing plant in Jersey City, N.J. and associated sites (“New Jersey Chrome”) and for other environmental contingencies, including National Priority List sites and legacy glass and chemical manufacturing sites. These reserves are reported as "Accounts payable and accrued liabilities" and "Other liabilities" in the accompanying condensed consolidated balance sheet.
Environmental Reserves
($ in millions)
September 30, 2016
 
December 31, 2015
New Jersey Chrome
$
112

 
$
133

Other
97

 
100

Total
$
209

 
$
233

Current portion
$
57

 
$
51
Environmental Costs [Table Text Block]
Pre-tax charges against income for environmental remediation costs are included in "Other charges" in the accompanying condensed consolidated statement of income. The pre-tax charges and cash outlays related to such environmental remediation for the three and nine months ended September 30, 2016 and 2015 were as follows:
 
Three Months Ended
September 30
 
Nine Months Ended
September 30
($ in millions)
2016
 
2015
 
2016
 
2015
Environmental remediation pre-tax charges
$
3

 
$
3

 
11

 
9

Cash outlays for environmental remediation activities
$
12

 
$
18

 
35

 
84