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Net Periodic Benefit Cost Schedule of Net Benefit Costs [Table Text Block] Depreciation Depreciation Plan Name [Domain] Plan Name [Domain] Scenario, Unspecified [Domain] Scenario [Domain] Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Legal settlement Legal Fees Concentration Risk Type [Domain] Concentration Risk Type [Domain] Operating Income (Loss) [Abstract] Operating Income (Loss) [Abstract] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Reportable Business Segment Information Segment Reporting [Text Block] Long-term line of credit Long-Term Line of Credit Minimum Minimum [Member] Dividends paid on PPG common stock Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date Commitment Term Through July 2028 Commitment Term Through July 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Restricted Stock Units (RSUs) [Member] Carrying Amount of Goodwill Attributable to Each Reportable Segment Goodwill [Table Text Block] Entity Central Index Key Entity Central Index Key Property, accumulated depreciation Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization Additional paid-in capital Additional Paid in Capital, Common Stock All Adjustments to Compensation All Adjustments to Compensation [Member] Corporate / non-segment unallocated, exclusive of depreciation and amortization Corporate Expenditure This element consists primarily of general corporate overhead and corporate service department costs, primarily in the areas of technical services, human resources and finance, which are used by the operations. It also includes business development costs. 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Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue [Table Text Block] Accrued pensions Liability, Defined Benefit Pension Plan, Noncurrent Name Forgone Recovery, Individual Name Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Statement [Line Items] Statement [Line Items] Total assets Assets Assets Defined Benefit Plan [Table] Defined Benefit Plan [Table] Reserves for environmental contingencies Accrual for Environmental Loss Contingencies Newly Approved Restructuring Actions Newly Approved Restructuring Actions [Member] Newly Approved Restructuring Actions Amortization of prior service credit Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Weighted Average Assumptions Used in Calculating the Fair Value of Stock Option Schedule of Share-Based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] Operating Segments Operating Segments [Member] Stock options granted from the PPG Omnibus Plan, weighted average fair value per share (in usd per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value 1.2175% Notes Due 2030 1.2175% Notes Due 2030 [Member] 1.2175% Notes Due 2030 Reserves for environmental contingencies classified as current liabilities Accrued Environmental Loss Contingencies, Current Stock-Based Compensation Share-Based Payment Arrangement [Text Block] Industrial Coatings Industrial Coatings Industrial Coatings Segment [Member] Industrial Coatings Segment [Member] PEO PEO [Member] Global Architectural Coatings Global Architectural Coatings Segment [Member] Global Architectural Coatings Segment Other liabilities Other Liabilities, Noncurrent Goodwill Beginning Balance Ending Balance Goodwill Retirement Plan Type [Axis] Retirement Plan Type [Axis] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to 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Segment [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Award Timing Disclosures [Line Items] Accumulated Translation Adjustment [Member] Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Earnings per common share (attributable to PPG) - assuming dilution (in dollars per share) Earnings Per Share, Diluted Accumulated Other Comprehensive Income Loss [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Current Reporting Status Entity Current Reporting Status Cash used for financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Loss from discontinued operations, net of tax (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Economic Cash Flow Hedging [Member] Other Other 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