Entity Tax Identification Number Entity Tax Identification Number Maximum Maximum [Member] Legal Entity [Axis] Legal Entity [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Description of Plan [Table] EBP, Description of Plan [Table] Mutual funds Mutual Fund [Member] Cash Equivalents EBP, Cash Equivalents [Policy Text Block] EBP, Cash Equivalents Investment sold, excluding plan interest in master trust, selling price EBP, Investment Sold, Excluding Plan Interest in Master Trust, Selling Price EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] Note receivable from participant, highest outstanding balance, lookback period EBP, Note Receivable from Participant, Account, Highest Outstanding Balance, Lookback Period EBP, Note Receivable from Participant, Account, Highest Outstanding Balance, Lookback Period Total deductions EBP, Change in Net Asset Available for Benefit, Decrease Note receivable from participant, account, maximum borrowing, amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Fair Value Measurement EBP, Investment, Fair Value and NAV [Text Block] EBP 385 EBP 385 [Member] EBP 385 Note receivable from participant, account, minimum borrowing amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Accrued expenses EBP, Accrued Expense Employer contribution, annual employer additional contribution, percentage EBP, Employer Contribution, Annual Employer Additional Contribution, Percentage EBP, Employer Contribution, Annual Employer Additional Contribution, Percentage Investments at fair value EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Level 1 Fair Value, Inputs, Level 1 [Member] EBP, Investment, Fair Value and NAV [Abstract] Total assets EBP, Asset Assets: EBP, Asset [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] Additions: EBP, Change in Net Asset Available for Benefit, Increase [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Benefit Payments EBP, Payment to Participant [Policy Text Block] Amendment Flag Amendment Flag Employee EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution Basis of Accounting EBP, Basis of Accounting [Policy Text Block] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] Investment, number of shares (in shares) EBP, Investment, Number of Shares EBP, Description of Plan and Accounting Change [Abstract] Schedule of Financial Assets Reported at Fair Value on a Recurring Basis EBP, Investment, Fair Value and NAV [Table Text Block] Investments [Domain] Investments [Domain] Vested account balance, minimum for loan EBP, Vested Account Balance, Minimum For Loan EBP, Vested Account Balance, Minimum For Loan Use of Estimates EBP, Use of Estimate [Policy Text Block] Form 5500, Schedule H, Part IV, Line 4i - Schedule of Assets (Held at End of Year) EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] Employer EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Minimum Minimum [Member] Investment Type [Axis] Investment Type [Axis] Interest income on notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Liabilities: Liabilities [Abstract] Net appreciation in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment Interest and dividend income EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] EBP, Plan Number EBP, Plan Number EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] Description of Plan EBP, Description of Plan [Text Block] Vesting period EBP, Employer Contribution Vesting Service Period EBP, Employer Contribution Vesting Service Period EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] Participant contribution, maximum contribution to eligible compensation, percentage EBP, Participant Contribution, Maximum Contribution to Eligible Compensation, Percentage EBP, Participant Contribution, Maximum Contribution to Eligible Compensation, Percentage PPG Industries, Inc. common stock EBP, Employer, Common Stock [Member] EBP, Schedule of Asset Held for Investment [Abstract] EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Total additions EBP, Change in Net Asset Available for Benefit, Increase Investment, Identifier [Axis] Investment, Identifier [Axis] Administration expenses EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Total EBP, Asset Held for Investment Administrative expenses paid by parent Employee Benefit Plan Administrative Expense Paid By Employer Employee Benefit Plan Administrative Expense Paid By Employer Risk and Uncertainties EBP, Risk and Uncertainty [Policy Text Block] Document Information [Line Items] Document Information [Line Items] Employer contribution, participant compensation matched, percentage EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Level 2 Fair Value, Inputs, Level 2 [Member] Note receivable from participant, account, primary residence, borrowing term EBP, Note Receivable From Participant, Account, Primary Residence, Borrowing Term EBP, Note Receivable From Participant, Account, Primary Residence, Borrowing Term EBP, Tax Status [Table] EBP, Tax Status [Table] Net decrease in net assets available for benefits EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Related-Party Transactions EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Note receivable from participant, general loan, borrowing term EBP, Note Receivable From Participant, Account, General Purpose, Borrowing Term EBP, Note Receivable From Participant, Account, General Purpose, Borrowing Term Participant contribution, automatic, deferral rate EBP, Participant Contribution, Automatic, Deferral Rate Withdrawals EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Current Value EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] EBP, Tax Status [Abstract] Loans to participants EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Investment Valuation EBP, Investment [Policy Text Block] Change in net asset available for benefit, additional employer contribution EBP, Change In Net Asset Available for Benefit, Increase From Additional Employer Contribution, Cash EBP, Change in Net Asset Available for Benefit, Increase From Additional Employer Contribution Document Type Document Type Plan Termination EBP, Plan Termination [Text Block] Entity Central Index Key Entity Central Index Key Participant loan, interest rate EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] Cash equivalents Cash and Cash Equivalents [Member] Deductions: EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Notes receivable from participants EBP, Note Receivable from Participant Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Summary of Significant Accounting Policies and Related Matters EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name Investment acquired, excluding plan interest in master trust, cost EBP, Investment Acquired, Excluding Plan Interest in Master Trust, Cost Income Tax Status EBP, Tax Status [Text Block] Note receivable from participant, account, maximum borrowing, to total account, percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Document Information [Table] Document Information [Table] Notes Receivable from Participants EBP, Note Receivable from Participant [Policy Text Block] Total net investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Level 3 Fair Value, Inputs, Level 3 [Member] Note receivable from participant, outstanding loans, maximum EBP, Note Receivable from Participant, Account, Outstanding Loans, Maximum EBP, Note Receivable from Participant, Account, Outstanding Loans, Maximum Net Assets Available for Benefits Beginning of year End of year EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Employer contribution, matching percentage EBP, Employer Contribution, Matching Percentage EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items]