Subsequent Events	3 Months Ended
Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Business Restructuring On April 23, 2018, the Company approved a business restructuring plan which includes actions to reduce its global cost structure. The program is in response to the impacts of a customer assortment change in our U.S. architectural coatings business during the first quarter 2018 and sustained, elevated raw material inflation. The program aims to further right-size employee headcount and production capacity in certain businesses based on current product demand, as well as reductions in various global functional and administrative costs. A pretax restructuring charge of $80 million to $85 million, based on current exchange rates, will be recorded in PPG's second quarter 2018 financial results, of which about $75 million to $80 million represents employee severance and other cash costs. The remainder of the charge represents the write-down of certain assets and other non-cash costs. In addition, other cash costs of up to $35 million to $40 million will be incurred, consisting of incremental restructuring-related cash costs for certain items that are required to be expensed on an as-incurred basis of approximately $15 million and approximately $20 million to $25 million for items which are expected to be capitalized. The Company also expects approximately $15 million of incremental non-cash accelerated depreciation expense for certain assets due to their reduced expected asset life as a result of this program. Substantially all restructuring actions are expected to be complete by the end of the second quarter 2019 and will result in the net reduction of approximately 1,100 positions. Environmental Remediation Charges Environmental remediation of the NJ Chrome sites and our legacy glass and chemical sites is ongoing. Information impacting the Company's estimates of future remediation costs at these sites that became available after March 31, 2018, led to a conclusion that the existing reserves for the NJ Chrome and legacy glass and chemical sites should be increased by $26 million and $8 million, respectively. Because this information concerning existing environmental remediation reserves became available prior to the issuance of the Company's condensed consolidated financial statements for the quarter ended March 31, 2018, applicable U.S. GAAP requires that these increases in the environmental remediation reserves be treated as a subsequent event that is recorded as of March 31, 2018. See Note 17, "Commitments and Contingencies" for additional information concerning our environmental remediation reserves.

Subsequent Events

Business Restructuring

On April 23, 2018, the Company approved a business restructuring plan which includes actions to reduce its global cost structure. The program is in response to the impacts of a customer assortment change in our U.S. architectural coatings business during the first quarter 2018 and sustained, elevated raw material inflation. The program aims to further right-size employee headcount and production capacity in certain businesses based on current product demand, as well as reductions in various global functional and administrative costs. A pretax restructuring charge of $80 million to $85 million, based on current exchange rates, will be recorded in PPG's second quarter 2018 financial results, of which about $75 million to $80 million represents employee severance and other cash costs. The remainder of the charge represents the write-down of certain assets and other non-cash costs. In addition, other cash costs of up to $35 million to $40 million will be incurred, consisting of incremental restructuring-related cash costs for certain items that are required to be expensed on an as-incurred basis of approximately $15 million and approximately $20 million to $25 million for items which are expected to be capitalized. The Company also expects approximately $15 million of incremental non-cash accelerated depreciation expense for certain assets due to their reduced expected asset life as a result of this program. Substantially all restructuring actions are expected to be complete by the end of the second quarter 2019 and will result in the net reduction of approximately 1,100 positions.

Environmental Remediation Charges

Environmental remediation of the NJ Chrome sites and our legacy glass and chemical sites is ongoing. Information impacting the Company's estimates of future remediation costs at these sites that became available after March 31, 2018, led to a conclusion that the existing reserves for the NJ Chrome and legacy glass and chemical sites should be increased by $26 million and $8 million, respectively. Because this information concerning existing environmental remediation reserves became available prior to the issuance of the Company's condensed consolidated financial statements for the quarter ended March 31, 2018, applicable U.S. GAAP requires that these increases in the environmental remediation reserves be treated as a subsequent event that is recorded as of March 31, 2018. See Note 17, "Commitments and Contingencies" for additional information concerning our environmental remediation reserves.