Rollovers EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover 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] Investment sold, 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] EBP, Accounting Standard Update and Change in Accounting Principle [Table] EBP, Accounting Standard Update and Change in Accounting Principle [Table] Note receivable from participant, account, 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 EBP, Fully Benefit-Responsive Investment Contract [Table] EBP, Fully Benefit-Responsive Investment Contract [Table] 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] Note receivable from participant, account, minimum borrowing, amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount EBP, Fully Benefit-Responsive Investment Contract [Abstract] 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 Money market funds Money Market Funds [Member] Level 1 Fair Value, Inputs, Level 1 [Member] EBP, Reconciliation of Financial Statement to Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Table Text Block] Corporate Debt Corporate Debt Securities [Member] EBP, Investment, Fair Value and NAV [Abstract] Net 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, interest rate EBP, Investment, Interest Rate Investment (in shares) EBP, Investment, Number of Shares EBP, Description of Plan and Accounting Change [Abstract] Receivables: EBP, Receivable [Abstract] EBP, Investment, Fair Value and NAV EBP, Investment, Fair Value and NAV [Table Text Block] Asset-Backed Security Asset-Backed Securities [Member] Stable Value Fund EBP, Stable Value Fund [Text Block] EBP, Stable Value Fund 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] Stable value fund, minimum interest crediting rate EBP, Stable Value Fund, Minimum Interest Crediting Rate EBP, Stable Value Fund, Minimum Interest Crediting Rate 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] Change in the adjustment from contract value to fair value for fully benefit-responsive investment contracts EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Increase (Decrease) from Contract Value to Current Value 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 Dividend election, maximum cash distribution percentage EBP, Dividend Election, Maximum Cash Distribution Percentage EBP, Dividend Election, Maximum Cash Distribution Percentage Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution 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] Plan number EBP, Plan Number EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] Description of the Plan EBP, Description of Plan [Text Block] Employer contribution vesting service 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] Adjustment from contract value to fair value for fully benefit-responsive investment contracts EBP, Reconciliation to Form 5500, Net Asset Available for Benefit, Contract Value to Current Value Adjustment EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] Note receivable from participant, loan default lookback period EBP, Note Receivable from Participant, Account, Loan Default, Lookback Period EBP, Note Receivable from Participant, Account, Loan Default, Lookback Period 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] 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 Risk and Uncertainties EBP, Risk and Uncertainty [Policy Text Block] Document Information [Line Items] Document Information [Line Items] Employer contribution, participant compensation matched, percent 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 Net income per the Form 5500 EBP, Form 5500 Caption, Net Income (Loss) EBP, Fully Benefit-Responsive Investment Contract [Line Items] EBP, Fully Benefit-Responsive Investment Contract [Line Items] EBP, Tax Status [Table] EBP, Tax Status [Table] Net decrease in net assets available for benefits 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] Participant contribution, automatic, deferral rate EBP, Participant Contribution, Automatic, Deferral Rate Dividend income on investment EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment 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, Tax Status [Abstract] EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP 384 EBP 384 [Member] EBP 384 Reconciliation of Financial Statements to Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Text Block] Loans to participants with interest rates ranging from 3.25% to 10.50% and maturity dates through November 2055* EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Investment Valuation EBP, Investment [Policy Text Block] Fair Value, Inputs, Level 1, Level 2, and Level 3 Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Employer additional contribution, change in net asset available for benefit, increase from employer contribution, cash 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, Cash EBP, Accounting Standard Update and Change in Accounting Principle [Line Items] EBP, Accounting Standard Update and Change in Accounting Principle [Line Items] Document Type Document Type Plan Termination EBP, Plan Termination [Text Block] Entity Central Index Key Entity Central Index Key Involuntary cash-out limit EBP, Involuntary Cash-out Limit EBP, Involuntary Cash-out Limit Participant loan, interest rate EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Reconciliation of Financial Statement to Form 5500 [Abstract] Common/collective trusts Common Collective Trust [Member] Net Assets Available for Benefits: EBP, Net Asset Available for Benefit [Abstract] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] Dividend election, maximum reinvestment percentage EBP, Dividend Election, Maximum Reinvestment Percentage EBP, Dividend Election, Maximum Reinvestment Percentage Cash and cash equivalent 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 Note receivable from participant, general loan, borrowing term EBP, Note Receivable From Participant, Account, General Loan, Borrowing Term EBP, Note Receivable From Participant, Account, General Loan, Borrowing Term 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, cost EBP, Investment Acquired, Excluding Plan Interest in Master Trust, Cost Federal 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 Mortgage-Backed Security Collateralized Mortgage Obligations [Member] 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 Note receivable from participant, loan payoff waiting period EBP, Note Receivable from Participant, Account, Loan Payoff Waiting Period EBP, Note Receivable from Participant, Account, Loan Payoff Waiting Period 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 Net Assets Available for Benefits EBP, Net Asset Available for Benefit Total investments EBP, Investment, Excluding Plan Interest in Master Trust, Fair and Contract Value Entity [Domain] Entity [Domain] Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Investments at contract value EBP, Investment, Excluding Plan Interest in Master Trust, Contract Value Forfeited nonvested account EBP, Forfeited Nonvested Account Employer contribution, matching percentage EBP, Employer Contribution, Matching Percentage Total net assets per the Form 5500 EBP, Form 5500 Caption, Net Assets NAV Fair Value Measured at Net Asset Value Per Share [Member] EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] U.S. Government Obligation US Treasury Notes Securities [Member] EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items]