Redemption Frequency (If currently eligible) EBP, Fair Value, Investment, NAV, Redemption Frequency EBP, Fair Value, Investment, NAV, Redemption Frequency Mellon Capital Mid Cap Stock Index Fund Common Collective Trust, Mellon Capital Mid Cap Stock Index Fund [Member] Common Collective Trust, Mellon Capital Mid Cap Stock Index Fund Entity tax identification number Entity Tax Identification Number Employee rollover amount EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Maximum Maximum [Member] Less: Loans Deemed Distributed EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Increase (Decrease) from Deemed Distribution Investment Advisory and Management Fees EBP, Change In Net Asset Available For Benefit, Decrease From Investment Advisory And Management Expense EBP, Change In Net Asset Available For Benefit, Decrease From Investment Advisory And Management Expense Legal Entity [Axis] Legal Entity [Axis] Employer contribution, matching percentage, non-rollover contributions, percentage EBP, Employer Contribution, Participant Compensation Matched, Percentage, Non-Rollover Contributions EBP, Employer Contribution, Participant Compensation Matched, Percentage, Non-Rollover Contributions Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Description of Plan [Table] EBP, Description of Plan [Table] Registered Investment Companies REGISTERED INVESTMENT COMPANIES Mutual Fund [Member] Less: Assets and Activity Related to Loans Deemed Distributed with No Post-Default Payments EBP, Reconciliation to Form 5500, Note Receivable, Deemed Distribution Mellon Capital Aggregate Bond Index Fund Common Collective Trust, Mellon Capital Aggregate Bond Index Fund [Member] Common Collective Trust, Mellon Capital Aggregate Bond Index Fund Pretax deferral rate, annual increase EBP, Participant Contribution, Automatic, Annual Increase Deferral Rate EBP, Participant Contribution, Automatic, Annual Increase Deferral Rate Fair value of disposed shares 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, Fully Benefit-Responsive Investment Contract [Table] EBP, Fully Benefit-Responsive Investment Contract [Table] Self-Directed Brokerage Account EBP, Self-Directed Brokerage Account [Member] Maximum borrowing, amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount FAIR VALUE MEASUREMENTS EBP, Investment, Fair Value and NAV [Text Block] Minimum borrowing, amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Mellon Capital Emerging Markets Stock Index Fund Common Collective Trust, Mellon Capital Emerging Markets Stock Index Fund [Member] Common Collective Trust, Mellon Capital Emerging Markets Stock Index Fund EBP, Fully Benefit-Responsive Investment Contract [Abstract] William Blair Large Cap Growth I Common Collective Trust, William Blair Large Cap Growth I [Member] Common Collective Trust, William Blair Large Cap Growth I Investments at Fair Value Total Assets Reflecting Investments at Fair Value EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Money Market Fund Money Market Funds [Member] Level 1 Fair Value, Inputs, Level 1 [Member] Reconciliation of Financial Statement to Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Table Text Block] INVESTMENT CONTRACTS EBP, Fully Benefit-Responsive Investment Contract [Text Block] Maximum annual contribution percentage EBP, Participant Contribution, Maximum Annual Compensation To Total Compensation, Percentage EBP, Participant Contribution, Maximum Annual Compensation To Total Compensation, Percentage ADJUSTMENT FROM FAIR VALUE TO CONTRACT VALUE EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Fair Value Adjustment to Contract Value EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Fair Value Adjustment to Contract Value EBP, Investment, Fair Value and NAV [Abstract] Total Assets EBP, Asset Statistical Measurement [Axis] Statistical Measurement [Axis] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Distributions to Participants EBP, Payment to Participant [Policy Text Block] Total Liabilities EBP, Liability Amendment Flag Amendment Flag Employer contribution, matching percentage of eligible compensation EBP, Employer Contribution, Matching Percentage, Percentage Of Eligible Compensation EBP, Employer Contribution, Matching Percentage, Percentage Of Eligible Compensation Participants EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution Less: Assets and Activity Related to Loans Deemed Distributed with No Post-Default Payments EBP, Reconciliation to Form 5500, Net Asset Available for Benefit, Deemed Distribution Basis of Accounting EBP, Basis of Accounting [Policy Text Block] U.S. GOVERNMENT SECURITIES US Government Debt Securities [Member] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] Balance Reported on Form 5500 EBP, Form 5500 Caption, Participant Loans JPMorgan Strategic Property Fund Common Collective Trust, JPMorgan Strategic Property Fund [Member] Common Collective Trust, JPMorgan Strategic Property Fund Rate of Interest EBP, Investment, Interest Rate Number of shares held in Plan (in shares) EBP, Investment, Number of Shares EBP, Description of Plan and Accounting Change [Abstract] Maximum loan term, residential loans EBP, Note Receivable From Participant, Account, Residential, Maximum Borrowing Term EBP, Note Receivable From Participant, Account, Residential, Maximum Borrowing Term Schedule of Fair Value EBP, Investment, Fair Value and NAV [Table Text Block] TOTAL - INVESTMENT CONTRACTS AT CONTRACT VALUE Investments At Contract Value [Member] Investments At Contract Value Subtotal Equities Common Stock [Member] Investments [Domain] Investments [Domain] Corporate Stocks CORPORATE STOCKS EBP, Nonemployer, Common Stock [Member] Use of Estimates EBP, Use of Estimate [Policy Text Block] EBP, Related Party and Party-in-Interest [Domain] EBP, Related Party and Party-in-Interest [Domain] SCHEDULE H, LINE 4I - SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] RISK AND UNCERTAINTIES EBP, Risk and Uncertainty [Text Block] Employer EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Number of acquired shares (in shares) EBP, Investment, Purchased, Number of Shares Basis spread on variable rate EBP, Note Receivable From Participant, Account, Basis Spread On Variable Rate EBP, Note Receivable From Participant, Account, Basis Spread On Variable Rate EBP, Related Party and Party-in-Interest [Axis] EBP, Related Party and Party-in-Interest [Axis] 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 Professional Fees EBP, Change In Net Asset Available For Benefit, Decrease From Professional Expense EBP, Change In Net Asset Available For Benefit, Decrease From Professional Expense 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] Mellon Capital Small Cap Stock Index Fund Common Collective Trust, Mellon Capital Small Cap Stock Index Fund [Member] Common Collective Trust, Mellon Capital Small Cap Stock Index Fund Plan number EBP, Plan Number Increase (Decrease) in Net Assets - Schedule H, Part II, Line 2k EBP, Form 5500 Caption, Net Income (Loss) [Abstract] Number of financial institutions EBP, Investment, Number Of Financial Institutions EBP, Investment, Number Of Financial Institutions EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] PLAN DESCRIPTION EBP, Description of Plan [Text Block] MONEY MARKET FUND Money Market Funds, Fair Value [Member] Money Market Funds, Fair Value 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] AEP Stock EBP, Employer, Common Stock [Member] Participant investment increments, percentage EBP, Participant Accounts, Investment Incremental Percentage EBP, Participant Accounts, Investment Incremental Percentage EBP, Schedule of Asset Held for Investment [Abstract] Net Assets - Schedule H, Part I, Line 1l EBP, Form 5500 Caption, Net Assets [Abstract] EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Mellon Capital Stock Index Fund Common Collective Trust, Mellon Capital Stock Index Fund [Member] Common Collective Trust, Mellon Capital Stock Index Fund TOTAL ASSETS AT FAIR VALUE Assets At Fair Value [Member] Assets At Fair Value Mellon Capital International Stock Index Fund Common Collective Trust, Mellon Capital International Stock Index Fund [Member] Common Collective Trust, Mellon Capital International Stock Index Fund Allowance for credit losses EBP, Note Receivable from Participant, Allowance for Credit Loss INVESTMENT INCOME EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Investment, Identifier [Axis] Investment, Identifier [Axis] Total Administrative and Management Fees Administrative and management fees EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense TOTAL NET ASSETS EBP, Asset Held for Investment Document Information [Line Items] Document Information [Line Items] EBP, Risk and Uncertainty [Line Items] EBP, Risk and Uncertainty [Line Items] EBP, Risk and Uncertainty [Table] EBP, Risk and Uncertainty [Table] Sands Capital International Growth CIT Common Collective Trust, Sands Capital International Growth CIT [Member] Common Collective Trust, Sands Capital International Growth CIT EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Level 2 Fair Value, Inputs, Level 2 [Member] Incremental contribution percentage EBP, Participant Contribution, Incremental Contribution Percentage EBP, Participant Contribution, Incremental Contribution Percentage Number of disposed shares (in shares) EBP, Investment, Sold, Number of Shares Common Collective Trust, Conestoga SMID Cap Growth CIT Common Collective Trust, Conestoga SMID Cap Growth CIT [Member] Common Collective Trust, Conestoga SMID Cap Growth CIT MONEY MARKET FUND Money Market Funds, Contract Value [Member] Money Market Funds, Contract Value Reported on 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 INCREASE Per Financial Statements EBP, Change in Net Asset Available for Benefit, Increase (Decrease) RELATED PARTY AND PARTY-IN-INTEREST 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] Pretax deferral rate EBP, Participant Contribution, Automatic, Deferral Rate Participant Loans - Schedule H, Part I, Line 1c(8) EBP, Form 5500 Caption, Participant Loans [Abstract] Dividend income EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment DISTRIBUTIONS TO PARTICIPANTS 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] Common Collective Trust, William Blair SMID Cap Growth CIT Common Collective Trust, William Blair SMID Cap Growth CIT [Member] Common Collective Trust, William Blair SMID Cap Growth CIT Other Fees EBP, Change In Net Asset Available For Benefit, Decrease From Other Expense EBP, Change In Net Asset Available For Benefit, Decrease From Other Expense EBP, Statement of Net Asset Available for Benefit [Abstract] Empower Retirement and BNYM Employee Benefit Plan Trustee And Plan Record Keeper [Member] Employee Benefit Plan Trustee And Plan Record Keeper EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] Pending Trades, Net EBP, Liability for Investment Purchase TOTAL - INVESTMENT CONTRACTS Investment Contracts [Member] 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 002 EBP 002 [Member] EBP 002 Administrative and Management Fees EBP, Expense [Policy Text Block] RECONCILIATION OF FINANCIAL STATEMENTS TO THE FORM 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Text Block] PARTICIPANT LOANS (Interest rates ranging from 4.25% to 10.5%, maturing through May 2048) EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Investment Valuation and Income Recognition / Fair Value Measurements of Assets EBP, Investment [Policy Text Block] 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, Reconciliation of Financial Statement to Form 5500 [Abstract] Subtotal Common/Collective Trusts COMMON / COLLECTIVE TRUSTS Common Collective Trust [Member] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] EBP, Risk and Uncertainty [Abstract] EBP, Subsequent Event [Table] EBP, Subsequent Event [Table] ADMINISTRATIVE AND MANAGEMENT FEES EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Notes Receivable from Participants Balance per Financial Statements EBP, Note Receivable from Participant Mellon Capital Treasury Inflation-Protected Securities Fund Common Collective Trust, Mellon Capital Treasury Inflation-Protected Securities Fund [Member] Common Collective Trust, Mellon Capital Treasury Inflation-Protected Securities Fund Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] ACCOUNTING POLICIES EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name MetWest Total Return Bond Fund Common Collective Trust, MetWest Total Return Bond Fund [Member] Common Collective Trust, MetWest Total Return Bond Fund Acquired fair value EBP, Investment Acquired, Excluding Plan Interest in Master Trust, Cost EBP, Subsequent Event [Abstract] SUBSEQUENT EVENTS EBP, Subsequent Event [Text Block] Cost basis Collateral, Par, or Maturity Value EBP, Investment, Excluding Plan Interest in Master Trust, Cost Employer contribution, matching percentage, non-rollover contributions EBP, Employer Contribution, Matching Percentage, Non-Rollover Contributions EBP, Employer Contribution, Matching Percentage, Non-Rollover Contributions FEDERAL INCOME TAX EBP, Tax Status [Text Block] Maximum borrowing from account balance, percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage EBP, Subsequent Event [Line Items] EBP, Subsequent Event [Line Items] Document Information [Table] Document Information [Table] AEP STOCK AEP Stock [Member] AEP Stock CORPORATE DEBT INSTRUMENTS - PREFERRED Corporate Debt Securities - Preferred [Member] Corporate Debt Securities - Preferred Notes Receivable from Participants EBP, Note Receivable from Participant [Policy Text Block] Total Investment Income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment Redemption Notice Period EBP, Fair Value, Investment, NAV, Redemption, Notice 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] NET ASSETS AVAILABLE FOR BENEFITS NET ASSETS AVAILABLE FOR BENEFITS BEGINNING OF YEAR NET ASSETS AVAILABLE FOR BENEFITS END OF YEAR Balance per Financial Statements EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] SELF DIRECTED BROKERAGE ACCOUNT Self-Directed Brokerage Account [Member] Self-Directed Brokerage Account 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 CORPORATE DEBT INSTRUMENTS - ALL OTHER Corporate Debt Securities - Other [Member] Corporate Debt Securities - Other Employer contribution, matching percentage EBP, Employer Contribution, Matching Percentage Balance Reported on Form 5500 EBP, Form 5500 Caption, Net Assets Other Fair Value Estimated Using Net Asset Value per Share Fair Value Measured at Net Asset Value Per Share [Member] 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] Loan term EBP, Note Receivable From Participant, Account, Borrowing Term EBP, Note Receivable From Participant, Account, Borrowing Term