OTHER COMPREHENSIVE INCOME
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Pollution Control Bonds
Long-term Pollution Control Bond
Cross Default Provisions Maximum Third Party Obligation Amount
Cross Default Provisions Maximum Third Party Obligation Amount
Non-exchange traded commodity contracts containing cross-default provisions
Regulatory Asset for Under-Recovered Fuel Costs
Regulatory Assets, Current
Cost
Investment Owned, at Cost
AEP Transmission Holdco [Member]
AEP Transmission Holdco [Member]
AEP Transmission Holdco.
Alternative and Other [Member]
Alternative and Other [Member]
Alternative and Other [Member]
COVID-19
COVID-19 [Member]
COVID-19
Disallowance Item [Domain]
Disallowance Item [Domain]
[Domain] for Disallowance Item [Axis]
Statistical Measurement [Domain]
Statistical Measurement [Domain]
Unrealized Gain on Securities
Unrealized Gain on Securities
Common Stock Dividends
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders
AOCI Gain (Loss) Net of Tax
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax
Financing Activities (Textuals)
Financing Activities Textuals [Abstract]
Financing Activities.
Preferred Stock [Member]
Preferred Stock [Member]
Security Exchange Name
Security Exchange Name
Other Revenues [Member]
Other Revenues [Member]
Other Revenues.
Maximum Future Payments for Letters of Credit Uncommitted Facilities
Maximum Future Payments for Letters of Credit Uncommitted Facilities [Table Text Block]
[Table Text Block] for aep_MaximumFuturePaymentsForLettersOfCreditUncommittedFacilitiesTextBlock [Table]
364-Day Term Loan
Other Short-term Borrowings
Issuance of Long-term Debt
Proceeds from Issuance of Long-term Debt
TOTAL CURRENT LIABILITIES
Liabilities, Current
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassifications from Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Member]
Prepayments and Other Current Assets
Prepaid Expense and Other Assets, Current
Proceeds on Sale of Receivables to AEP Credit
Proceeds on Sale of Receivables to AEP Credit [Text Block]
Proceeds on sale of receivables to AEP Credit.
Fair Value Significant Unobservable Input Price Per Unit
Fair Value Significant Unobservable Input Price Per Unit
Price per unit of significant unobservable inputs, such as but not limited to fair value for financial transmission rights agreements and energy contracts.
Requested Recovery Amount of Previously Authorized Deferral
Requested Recovery Amount of Previously Authorized Deferral
Requested recovery amount of previously authorized deferral for Rockport Plant Unit Power Agreement expenses and related carrying charges.
Accounting Policies [Abstract]
Accounting Policies [Abstract]
Subsidiaries [Member]
Subsidiaries [Member]
Forward Equity Contract Payment Rate
Forward Equity Contract Payment Rate
Forward Equity Contract Payment Rate
Transfers out of Level 3
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3
Advances from Affiliates
Due to Related Parties, Current
Operating Lease, Payments
Operating Lease, Payments
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues [Text Block]
Accounts receivable and accrued unbilled revenues under the sale of receivables agreement.
Comprehensive Income
Comprehensive Income (Loss) Note [Text Block]
Wholesale and Competitive [Member]
Wholesale and Competitive [Member]
Revenues related to wholesale and competitive sales.
Equity Units [Axis]
Equity Units [Axis]
AEP Equity Units. Corporate units issued by AEP that settle in AEP stock.
Other Temporary Investments
Short-term Investments [Abstract]
AEPTCo Parent [Member]
AEPTCo Parent [Member]
AEPTCo Parent [Member]
Alternative [Member]
Alternative [Member]
Alternative [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Percentage of an Asset Acquired
Percentage of an Asset Acquired
Percentage of an asset acquired when AEP does not purchase the entire asset.
Approved Annual Revenue Increase
Approved Annual Revenue Increase
Amount of approved annual revenue increase.
Capital Investments [Member]
Capital Investments [Member]
Capital Investments [Member]
Regulatory Liabilities and Deferred Investment Tax Credits
Regulatory Liability, Noncurrent
TOTAL EXPENSES
Operating Expenses
Common Stock, Par or Stated Value Per Share
Common Stock, Par or Stated Value Per Share
Deferred Credits and Other Noncurrent Liabilities
Other Liabilities, Noncurrent
Principal Payments for Finance Leases Obligations
Finance Lease, Principal Payments
Direct Borrowing [Member]
Direct Borrowing [Member]
Direct Borrowing and Loans from and to Parent
Retail [Member]
Retail [Member]
Employees Participating in Voluntary Retirement Incentive Program
Employees Participating in Voluntary Retirement Incentive Program
Total number of employees participating in the voluntary retirement incentive program.
Residential [Member]
Residential [Member]
Retail revenues from the residential class.
Accrued Unbilled Revenues
Unbilled Receivables, Current
Proceeds from Investment Sales
Proceeds from Sale of Available-for-sale Securities
Commodity Hedges [Member]
Commodity [Member]
Accrued Reimbursement of Spent Nuclear Fuel Costs
Accrued Reimbursement of Spent Nuclear Fuel Costs
Accrued reimbursement of spent nuclear fuel costs at Cook nuclear plant. The Department of Energy has an obligation to I&M over the storage of spent nuclear waste.
DIR Revenue Amount above 2019 Authorized Limit
DIR Revenue Amount above 2019 Authorized Limit
Amount proposed by audit report that 2019 DIR revenue exceeded its authorized limit by.
Asset Retirement Obligation - Louisiana [Member]
Asset Retirement Obligation - Louisiana [Member]
Asset Retirement Obligation - Louisiana [Member]
June 2022 [Member]
June 2022 [Member]
June 2022
Statement [Line Items]
Statement [Line Items]
Renewable Energy Credits
Renewable Energy Credits
Amount of renewable energy credits removed from the materials and supplies line item and split out separately on the face of the balance sheet due to materiality.
Cash Collateral Received Netted Against Risk Management Assets
Securities Received as Collateral
Requested Recovery of Dolet Hills Power Station
Requested Recovery of Dolet Hills Power Station
The amount requested for recovery of Dolet Hills Power Station.
Asset Retirement Obligations (ARO) Liability for Nuclear Decommissioning of the Cook Plant
Decommissioning Liability, Noncurrent
Statement [Table]
Statement [Table]
Cash Collateral Paid Netted Against Risk Management Liabilities
Obligation to Return Securities Received as Collateral
Interest Cost
Defined Benefit Plan, Interest Cost
Statistical Measurement [Axis]
Statistical Measurement [Axis]
Tax Reform Excess ADIT Reversal
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent
FTRs [Member]
Financial Trasnsmission Rights [Member]
Risk management commodity contracts whose primary underlying risk is tied financial transmission rights.
Weighted Average [Member]
Weighted Average [Member]
Other Operation Expense [Member]
Other Operation Expense [Member]
Other operation expense.
Balance Sheet Information
Segment Reporting Information, Additional Information [Abstract]
Paid-in Captial
Members' Capital
Entity Small Business
Entity Small Business
Spent Nuclear Fuel Obligation
Spent Nuclear Fuel Obligation, Noncurrent
Comprehensive Income [Abstract]
Comprehensive Income [Abstract]
Maximum Minimum Average Interest Rates for Funds Borrowed from Loaned to Nonutility Money Pool
Maximum Minimum Average Interest Rates for Funds Borrowed from Loaned to Nonutility Money Pool [Text Block]
Tabular disclosure of the maximum and minimum weighted-average interest rate, calculated on a daily basis and the average interest rates of funds borrowed from or loaned to a Nonutility Money Pool during the period.The Nonutility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain nonutility subsidiaries.
Cook Plant Study Costs [Member]
Cook Plant Study Costs [Member]
Cook Plant Study Costs.
Amortization of Excess ADIT Not Subject to Normalization Requirements Policy
Unprotected Excess ADIT Amortization Policy [Policy Text Block]
Text Block for Unprotected Excess ADIT Amortization Policy.
Impact of 2019 Depreciation Rates on 2020
Impact of 2019 Depreciation Rates on 2020
Staff recommended 2019 depreciation rates should be implemented effective January 2020. This amount represents the total impact on 2020.
Financing Activities
Debt Disclosure [Text Block]
Fair Value Hierarchy and NAV [Domain]
Fair Value Hierarchy and NAV [Domain]
Ash Pond [Member]
Ash Pond [Member]
Ash Pond
Amendment Flag
Amendment Flag
Finite-Lived Intangible Assets, Major Class Name [Domain]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Income Taxes (Textuals) [Abstract]
Income Taxes (Textuals) [Abstract]
Income Taxes.
Due Date
Debt Instrument, Maturity Date 1
Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.).
Total Mezzanine Equity
Total Mezzanine Equity
Total mezzanine equity balance.
Customers without Power
Customers without Power
Total number of customers without power due to a storm.
Deferred Fuel Over/Under-Recovery, Net
Fuel Over Under Recovery Net
The net change during the reporting period in the value of the asset (liability) created by an (over) under recovery of fuel costs. An over recovery represents the excess of fuel revenues billed to customers over fuel costs incurred and an under recovery represents excess fuel costs incurred over fuel revenues billed to customers.
Percent of Voluntary Retirement Incentive Program Expense related to AEP Service Corporation
Percent of Voluntary Retirement Incentive Program Expense Related to AEP Service Corporation
This represents the percentage of total expense related to AEP Service Corporation in the voluntary Retirement Incentive Program.
Make Whole Premium on Extinguishment of Long-term Debt
Make Whole Premium on Extinguishment of Long-term Debt
The cash outflow for a make whole premium on long-term debt extinguished early.
Employee Benefits and Pension Assets
Employee Benefits and Pension Assets
Element represents the noncurrent asset recognized on the balance sheet that is associated with employee benefit and pension assets including, but not limited to, defined benefit pension plans, other postretirement defined benefit plans, deferred incentive compensation and other postemployment benefits.
Spent Nuclear Fuel and Decommissioning Trusts [Member]
Spent Nuclear Fuel and Decommissioning Trusts [Member]
Spent Nuclear Fuel and Decommissioning Trusts.
Loans to Parent
Loans to Parent
Loans to Parent at period end. Parent represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries.
Major Types of Trading Securities and Assets [Domain]
Financial Instruments [Domain]
Financial Instruments [Domain]
Excess ADIT and Excess Federal Income Taxes to Transmission Customers [Member]
Excess ADIT and Excess Federal Income Taxes to Transmission Customers [Member]
Excess ADIT and Excess Federal Income Taxes to Transmission Customers [Member]
Book Values and Fair Values of Long-term Debt
Fair Value, by Balance Sheet Grouping [Table Text Block]
Expected Return on Plan Assets
Defined Benefit Plan, Expected Return (Loss) on Plan Assets
Gain (Loss) on Fair Value Hedging Instruments
Derivative, Gain (Loss) on Derivative, Net
Fair Value Measurement [Domain]
Fair Value Measurement [Domain]
Intervenor Recommended Return on Common Equity
Intervenor Recommended Return on Common Equity
Intervenor recommended return on common equity.
Derivatives and Hedging
Derivatives, Policy [Policy Text Block]
Construction Expenditures Included in Noncurrent Liabilities as of September 30,
Capital Expenditures Incurred but Not yet Paid
Unrealized Loss on Securities
Unrealized Loss on Securities
Contract with Customer, Duration [Axis]
Contract with Customer, Duration [Axis]
Changes in the Fair Value of Net Trading Derivatives and other investments
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Cash, Cash Equivalents and Restricted Cash
Cash, Cash Equivalents and Restricted Cash [Abstract]
Cash, Cash Equivalents and Restricted Cash [Abstract]
Cumulative Fair Value Hedging Adjustment in the Carrying Amount of the Hedged Asset (Liability)
Cumulative Fair Value Hedging Adjustment in the Carrying Amount of the Hedged Asset (Liability)
Cumulative Fair Value Hedging Adjustment in the Carrying Amount of the Hedged Asset (Liability)
Recovery of Ohio Capacity Costs, Net
Deferral Of Ohio Capacity Costs
The increase (decrease) during the reporting period in amounts for the net under recovery of capacity deferrals related to the differential between $189/MW-day capacity cost and RPM (reliability pricing model) pricing.
Tax Cuts and Jobs Act, Change in Tax Rate, Deferred Tax Asset, Income Tax Expense
Tax Cuts and Jobs Act, Change in Tax Rate, Deferred Tax Asset, Income Tax Expense
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Impact of Cash Flow Hedges on Balance Sheet [Text Block]
Tabular disclosure of the impact of cash flow hedges on the balance sheet.
Property, Plant and Equipment, Type [Axis]
Long-Lived Tangible Asset [Axis]
Production and Investment Tax Credits
Effective Income Tax Rate Reconciliation production and investment tax credits
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations due to production and investment tax credits.
Allowance for Uncollectible Accounts
Accounts Receivable, Allowance for Credit Loss, Current
Revenue from Contracts with Customers [Abstract]
Revenue from Contracts with Customers [Abstract]
Revenue from Contracts with Customers [Abstract]
State and Local Jurisdiction [Member]
State and Local Jurisdiction [Member]
Financing Activities
Net Cash Provided by (Used in) Financing Activities [Abstract]
Accounts Receivable and Accrued Unbilled Revenues
Accounts and Financing Receivables, Held-for-Sale
Depreciation and Amortization
Utilities Operating Expense, Depreciation and Amortization
Exchange [Domain]
Exchange [Domain]
Deferred Charges and Other Noncurrent Assets
Other Assets, Noncurrent
Additional Settlement Liability if Cross Default Provision is Triggered
Assets Needed for Immediate Settlement, Aggregate Fair Value
Cash and Cash Equivalents
Cash and Cash Equivalents, Fair Value Disclosure
TOTAL ASSETS
Total Assets
Assets
Noncontrolling Interest assumed with Sempra Renewable LLC and Santa Rita East Acquisition
Noncash or Part Noncash Acquisition, Other Assets Acquired
Noncash or Part Noncash Acquisition, Investments Acquired
Amortization of Prior Service Cost (Credit)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)
Regulated Status [Axis]
Regulated Status [Axis]
Regulated Status Axis
Subsequent Event Type [Axis]
Subsequent Event Type [Axis]
Antidilutive Securities [Axis]
Antidilutive Securities [Axis]
Stockholders Equity ASU 2016-13 Adoption
Stockholders Equity ASU 2016-13 Adoption
This element represents movements included in the statement of changes in stockholders' equity which are specifically related to the adoption of ASU 2016-13.
Reclassification out of Accumulated Other Comprehensive Income [Axis]
Reclassification out of Accumulated Other Comprehensive Income [Axis]
Acquisitions and Dispositions
Mergers, Acquisitions and Dispositions Disclosures [Text Block]
Accounts Receivable and Accrued Unbilled Revenues
Receivables Held-for-sale [Abstract]
Money Pool Participant by Company Type [Domain]
Money Pool Participant by Company Type [Domain]
Money Pool Participant by Company Type.
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Changes In Accumulated Other Comprehensive Income by Component [Abstract]
TOTAL LIABILITIES
Liabilities
Public Utilities, Approved Equity Capital Structure, Percentage
Public Utilities, Approved Equity Capital Structure, Percentage
Senior Unsecured Notes Two [Member]
Senior Unsecured Notes Two [Member]
A senior note is a bond that takes priority over other debt securities sold by the issuer. In the event the issuer goes bankrupt, senior debt holders receive priority for [must receive] repayment [prior] relative to junior and unsecured (general) creditors.
Fair Value Measurements 1 (Textuals)
Fair Value Measurements 1 (Textuals) [Abstract]
Fair value measurements textuals abstract for assets and liabilities measured on a recurring basis.
Retirement Plan Type [Axis]
Retirement Plan Type [Axis]
All Other [Member]
Other Segments [Member]
Other Segments [Member]
Fair Values of Long-term Debt
Book Values And Fair Values Of Long Term Debt Policy [Text Block]
Policy for determining fair value of long-term debt.
Maximum and Minimum Interest Rates for Funds Either Borrowed from or Loaned to Utility Money Pool
Maximum And Minimum Interest Rates For Funds Either Borrowed From Or Loaned To Utility Money Pool [Text Block]
Tabular disclosure of the maximum and minimum weighted-average interest rate, calculated on a daily basis, of funds either borrowed from or loaned to a Utility Money Pool during the period. The Utility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain utility subsidiaries.
Organization and Summary of Significant Accounting Policies (Textuals)
Organization and Summary of Significant Accounting Policies Textuals [Abstract]
Organization and Summary of Significant Accounting Policies.
Level 1 [Member]
Fair Value, Inputs, Level 1 [Member]
Disallowance Item [Axis]
Disallowance Item [Axis]
Disallowance Item [Axis]
Dolet Hills Lignite Company Unbilled Fixed Costs
Dolet Hills Lignite Company Unbilled Fixed Costs
Dolet Hills Lignite Company unbilled fixed costs that will be billed to SWEPCo prior to closure.
Regulated Operations [Abstract]
Regulated Operations [Abstract]
Fuel, Materials and Supplies
Increase (Decrease) in Inventories
Weighted Average Interest Rate
Debt, Weighted Average Interest Rate
Amount of 2019 Investments [Member]
Amount of 2019 Investments [Member]
Amount of 2019 Investments [Member]
Dolet Hills Power Station Accelerated Depreciation [Member]
Dolet Hills Power Station Accelerated Depreciation [Member]
Dolet Hills Power Station Accelerated Depreciation [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Property Taxes
Amortization of Deferred Property Taxes
Jurisdiction [Domain]
Jurisdiction [Domain]
Jurisdiction
Deferral of Incremental Nuclear Refueling Outage Expenses, Net
Deferral of Incremental Nuclear Refueling Outage Expenses, Net
The net cash inflow or outflow due to Cook Unit 1 & 2 refueling outage levelization.
Redemption of Noncontrolling Interest in Trent & Desert Sky Windfarms
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests
Miscellaneous
Other Receivables
Common Stock, Shares, Outstanding
Common Stock, Shares, Outstanding
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Abstract]
Minimum Interest Rate for Funds Loaned
Minimum Interest Rate for Funds Loaned
The minimum weighted-average interest rate of funds outstanding at that time, calculated on a daily basis, loaned during the period.
Transmission
Public Utilities, Property, Plant and Equipment, Transmission
AEP Texas Interim Transmission and Distribution Rates [Member]
AEP Texas Interim Transmission and Distribution Rates [Member]
AEP Texas Interim Transmission and Distribution Rates
After 10 years
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value
Other
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent
Adjusted Cost of Domestic Equity Securities
Adjusted Cost Of Equity Securities
Adjusted cost of equity securities within the nuclear trusts
Common Stock, Shares Authorized
Common Stock, Shares Authorized
Weighted Average Dilutive Effect of Shares
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements
Total Property, Plant and Equipment
Total Property, Plant and Equipment
Property, Plant and Equipment, Gross
AEP Texas Inc. [Member]
AEP Texas Inc. [Member]
AEP Texas Inc.
Impairment Charge Total
Impairment Charge Total
Total impairment charge recorded as part of agreement.
Reportable Segment Information
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Guarantor Obligations by Nature [Axis]
Guarantor Obligations, Nature [Axis]
Income Statement [Abstract]
Income Statement [Abstract]
Accumulated Other Comprehensive Income [Member]
AOCI Attributable to Parent [Member]
Contractual Maturities, Fair Value of Debt Securities in Nuclear Trusts
Investments Classified by Contractual Maturity Date [Table Text Block]
Commitments Guarantees and Contingencies [Abstract]
Commitments Guarantees and Contingencies [Abstract]
Change in Short-term Debt, Net
Proceeds from (Repayments of) Short-term Debt, Maturing in Three Months or Less
2019 DIR Audit [Member]
2019 Ohio DIR Audit [Member]
2019 Ohio DIR Audit
Book Values and Fair Values of Long - term Debt
Long-term Debt, Other Disclosures [Abstract]
Revenue Textuals [Abstract]
Revenue Textuals [Abstract]
Revenue Textuals Abstract.
Schedule of Segment Reporting Information, by Segment [Table]
Schedule of Segment Reporting Information, by Segment [Table]
Maximum Potential Lease Payments, AEPRO Barge and Boat Leases
Maximum Potential Lease Payments, AEPRO Barge and Boat Leases
Future potential lease obligations under guaranteed AEPRO boat and barge leases.
Other Long Term Debt Two [Member]
OtherLongTermDebtTwo [Member]
Other Long Term Debt Two [Member]
Prepaid Pension and OPEB Assets [Member]
Prepaid Pension and OPEB assets [Member]
Prepaid Pension and OPEB assets
Power [Member]
Power Contract Member [Member]
Nominal energy measure used to calculate payments on a derivative instrument.
Servicing Contracts [Member]
Servicing Contracts [Member]
Remaining Recovery Period
Remaining Recovery Period, Plant Depreciation
The remaining amortization period for recovery of the plant depreciation.
Consolidated Entities [Axis]
Consolidated Entities [Axis]
Amounts Attributable to AEP Common Shareholders
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
Gross Unrealized Losses
Investment Owned, Unrecognized Unrealized Depreciation
Scenario [Domain]
Scenario [Domain]
Acquisitions of Assets
Payments to Acquire Property, Plant, and Equipment
Provision for Refund
Provision for Refund
Provision for Refund
Consolidation Items [Domain]
Consolidation Items [Domain]
Voluntary Retirement Incentive Program Expense
Voluntary Retirement Incentive Program Expense
This represents the categories of expense related to the voluntary Retirement Incentive Program.
Generation And Marketing [Member]
Generation And Marketing [Member]
Generation And Marketing [Member]
Notional Volume Of Derivative Instruments
Notional Volume Of Derivative Instruments [Abstract]
Notional Volume Of Derivative Instruments Abstract.
Minimum Lease Payments, Sale Leaseback Transactions, within Two Years
Minimum Lease Payments, Sale Leaseback Transactions, within Two Years
Advances to Affiliates
Due from Related Parties, Current
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment [Abstract]
Maturity Year [Domain]
Maturity Year [Domain]
Maturity of Net Fair Value of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities
Maturity Of Net Fair Value Of Risk Management Contracts Prior To Cash Collateral Assets Or Liabilities
Maturity of the net fair value of risk management contracts prior to cash collateral, assets or liabilities.
Staff Recommended Annual Rate Increase
Staff Recommended Annual Rate Increase
The staff's recommended annual rate increase.
Affiliated Long Term Debt Noncurrent
Long-term Debt - Affiliated
Affiliated Long Term Debt Noncurrent
Sum of the affiliated carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.
Equity Earnings (Loss) of Unconsolidated Subsidiaries
Income (Loss) from Equity Method Investments
Maximum Borrowings from Money Pool
Maximum Borrowings from Money Pool
Maximum Borrowings from a Money Pool at anytime during the period. The Money Pool represents a centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries.
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest
Gross Realized Gains on Investment Sales
Gross Realized Gains on Investment Sales On Short Term Investment
Gross Realized Gains on Investment Sales On Short Term Investment.
Maximum Future Payments for Letters of Credit Issued Under the Uncommitted Facility
Maximum Future Payments for Letters of Credit Issued Under the Uncommitted Facility
Maximum future payments for Letters of Credit issued under the uncommitted facility.
Reclassification out of Accumulated Other Comprehensive Income [Domain]
Reclassification out of Accumulated Other Comprehensive Income [Domain]
Notes Payable, Other Payables [Member]
Notes Payable, Other Payables [Member]
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect
Beginning Balance
Ending Balance
TOTAL MEMBER'S EQUITY
Members' Equity
Accrued Interest
Increase (Decrease) in Interest Payable, Net
Entity [Domain]
Entity [Domain]
Revolving Credit Facilities
Credit Facilities Structured
Amount of revolving credit facilities.
Additional Revenues Recognized to be Surcharged to Customers
Additional Revenues Recognized to be Surcharged to Customers
Increase in revenues recognized to be surcharged to customers
Total Commitment from Bank Conduits to Finance Receivables
Total Commitment From Bank Conduits To Finance Receivables
Total commitment from bank conduits to finance receivables.
Expected Retirement Date
Disposal Group, Including Discontinued Operation, Description and Timing of Disposal
Notes Payable, Other Payables Six [Member]
Notes Payable, Other Payables Six [Member]
A written promise to pay a note to a third party.
Loans Payable [Member]
Loans Payable [Member]
Other Revenues [Member]
Other Revenues - Affiliated and Nonaffiliated [Member]
Other Revenues - Affiliated and Nonaffiliated.
Capital Contributions from Parent
Proceeds from Contributions from Parent
Asset Retirement Obligation [Member]
Asset Retirement Obligation [Member]
Asset retirement obligation shown on the balance sheet
Transfers into Level 3
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Abstract]
Pension Contributions to Qualified Plan Trust
Qualified Pension Contribution
Payment for Pension Benefits
2021-2022 [Member]
2-3 Years [Member]
Time period in which fixed performance obligations will be satisfied.
Reversal of a Regulatory Provision
Reversal of a Regulatory Provision
Reversal of a Regulatory Provision.
Approved Annual Revenue Decrease
Approved Annual Revenue Decrease
Amount of approved annual revenue decrease.
Other Current Assets
Increase (Decrease) in Other Current Assets
Pollution Control Bond [Member]
Pollution Control Bond [Member]
Pollution Control Bond [Member]
Amount of Increase Related to Annual Depreciation Rates
Amount of Increase Related to Annual Depreciation Rates
Amount of increased depreciation expense approved.
Consolidated Entities [Domain]
Consolidated Entities [Domain]
Obligations Under Operating Leases
Operating Lease, Liability, Current
Securitized Debt for Receivables
Short-term Debt, Weighted Average Interest Rate, at Point in Time
2020 Ohio Base Rate Case [Member]
2020 Ohio Base Rate Case [Member]
2020 Ohio Base Rate Case
2019 Texas Base Rate Case [Member]
2019 Texas Base Rate Case [Member]
2019 Texas Base Rate Case [Member]
COVID 19 Electricity Relief Program Loan
COVID 19 Electricity Relief Program Loan [Member]
COVID 19 Electricity Relief Program Loan
Noncash Acquisitions Under Finance Leases
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability
Apple Blossom and Black Oak [Member]
Apple Blossom and Black Oak [Member]
Apple Blossom and Black Oak
Gain (Loss) on Hedging Instruments
Derivative Instruments, Gain (Loss) [Table Text Block]
Fair Value of Derivative Instruments
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Property, Plant and Equipment (Textuals)
Property, Plant and Equipment (Textuals) [Abstract]
Property Plant And Equipment Textuals Abstract.
Gross Unrealized Gains
Investment Owned, Unrecognized Unrealized Appreciation
Fair Value Measurements
Fair Value Disclosures [Text Block]
Regulatory Assets
Regulatory Assets, Noncurrent
Regulatory Assets, Noncurrent
Natural Gas [Member]
Natural Gas Contracts [Member]
Natural Gas Contract [Member]
Nominal energy measure used to calculate payments on a derivative instrument.
Public Utilities, Approved Debt Capital Structure, Percentage
Public Utilities, Approved Debt Capital Structure, Percentage
Qualified Pension Contribution
Defined Contribution Plan Disclosures [Table Text Block]
Share of Net Investment in Dolet Hills Power Station
Share of Net Investment in Dolet Hills Power Station
SWEPCo's share of the net investment in Dolet Hills Power Station.
Entity Registrant Name
Entity Registrant Name
Subsequent Event Type [Domain]
Subsequent Event Type [Domain]
Assets, Fair Value Disclosure
Assets, Fair Value Disclosure [Abstract]
TOTAL OTHER NONCURRENT ASSETS
Assets, Noncurrent
Maximum and Minimum Interest Rates
Maximum and Minimum Interest Rates [Abstract]
Maximum and Minimum Interest Rates.
364 Day Term Loan
364 Day Term Loan [Member]
364 Day Term Loan
Regulatory Liability for Over-Recovered Fuel Costs
Regulatory Liability, Current
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits [Abstract]
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits [Abstract]
Comparative Accounts Receivable Information
Proceeds from Sale and Collection of Other Receivables [Abstract]
2026-2033 [Memeber]
Maturity Period five [Member]
Maturity Period five
Cost of Removal Regulatory Liability
Cost of Removal Regulatory Liability
The regulatory liability recorded for cost of removal.
Dividends Paid on Common Stock
Payments of Ordinary Dividends, Common Stock
Entity Incorporation, State or Country Code
Entity Incorporation, State or Country Code
Basis of Accounting
Basis Of Accounting [Text Block]
Description of the basis of accounting used to prepare the financial statements (for example, U.S. Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).
Cash Collateral Netting
Cash Collateral Netting [Abstract]
Cash collateral netting detail.
Oxbow Unbilled Fixed Costs
Oxbow Unbilled Fixed Costs
Oxbow unbilled fixed costs that will be billed to SWEPCo prior to closure.
Maximum Shares Issued Under Equity Units Conversion
Maximum Shares Issued Under Equity Units Conversion
The maximum shares that can be issued related to AEP's Equity Units
Commercial [Member]
Commercial [Member]
Retail revenues from the commercial class.
Fair Value Of Derivative Liabilities Subject To Cross Default Provisions
Fair Value Of Derivative Liabilities Subject To Cross Default Provisions
Fair value of derivative liabilities subject to cross-default provisions.
Change in Advances to Affiliates, Net
Increase (Decrease) in Notes Receivable, Related Parties
Entity Address, Postal Zip Code
Entity Address, Postal Zip Code
Commodity
Commodity:
Commodity [Abstract]
Commodity.
Customer Deposits
Customer Deposits, Current
Expected Reimbursement for Spent Nuclear Fuel Dry Cask Storage
Expected Reimbursement For Spent Nuclear Fuel Dry Cask Storage
Future cash inflow for nuclear fuel dry cask storage reimbursement from the DOE.
Storm Related Costs [Member]
Storm Expense [Member]
Storm Costs [Member]
Goodwill
Goodwill
Sensitivity of Fair Value Measurements
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
Excess ADIT and Excess Federal Income Taxes to Distribution Customers [Member]
Excess ADIT and Excess Federal Income Taxes to Distribution Customers [Member]
Excess ADIT and Excess Federal Income Taxes to Distribution Customers [Member]
Purchased Electricity for Resale [Member]
Purchased Electricity for Resale [Member]
Purchased Electricity for Resale.
Common Stock, Dividends Per Share, Declared
Common Stock, Dividends, Per Share, Declared
Public Service Co Of Oklahoma [Member]
Public Service Co Of Oklahoma [Member]
Public Service Company Of Oklahoma Member
Transmission Portion of the Impact of 2017 Depreciation Rates on 2019
Transmission Portion of the Impact of 2017 Depreciation Rates on 2019
Staff recommended 2017 depreciation rates should be implemented effective January 2018. This amount represents the transmission portion of the total impact on 2019.
Change in Advances from Affiliates, Net
Increase (Decrease) in Notes Payable, Related Parties
Transmission Portion of the Impact of 2017 Depreciation Rates on 2018
Transmission Portion of the Impact of 2017 Depreciation Rates on 2018
Staff recommended 2017 depreciation rates should be implemented effective January 2018. This amount represents the transmission portion of the total impact on 2018.
Total Assets
Assets, Fair Value Disclosure
Net Equity Units Issuance Proceeds
Net Equity Units Issuance Proceeds
Net Equity Units proceeds after issuance costs.
Transmission [Member]
Electric Transmission [Member]
Entities [Table]
Entities [Table]
Impact of 2017 Depreciation Rates on 2018
Impact of 2017 Depreciation Rates on 2018
Staff recommended 2017 depreciation rates should be implemented effective January 2018. This amount represents the total impact on 2018.
After 1 year through 5 years
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value
Derivative Contract [Domain]
Derivative Contract [Domain]
Weighted Average Number of Diluted AEP Common Shares Outstanding
Weighted Average Number of Diluted AEP Common Shares Outstanding
Weighted Average Number of Shares Outstanding, Diluted
Impact of 2017 Depreciation Rates on 2019
Impact of 2017 Depreciation Rates on 2019
Staff recommended 2017 depreciation rates should be implemented effective January 2018. This amount represents the total impact on 2019.
Maintenance
Utilities Operating Expense, Maintenance
Public Utilities General Disclosures [Table]
Public Utilities General Disclosures [Table]
Debt Disclosure [Abstract]
Debt Disclosure [Abstract]
Refund of Global Settlement
Provision for Refund - Global Settlement
Provisions for refund for obligations to customers as a result of the OPCo Global Settlement.
Other [Member]
Portion at Other than Fair Value Measurement [Member]
Net Cash Flows from (Used for) Financing Activities
Net Cash Provided by (Used in) Financing Activities
Retirement of Long-term Debt
Repayments of Long-term Debt
Repayments of Long-term Debt
Short-term Debt, Type [Axis]
Short-term Debt, Type [Axis]
Transmission and Distribution Utilities [Member]
Transmission and Distribution Utilities Revenues [Member]
Transmission and Distribution Utilities Revenues [Member]
Transmission and Distribution Revenues.
Fixed Performance Obligations
Revenue, Remaining Performance Obligation, Amount
2024 and Forward [Member]
After 5 Years [Member]
Time period in which fixed performance obligations will be satisfied.
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold [Text Block]
Fees paid to AEP Credit for customer accounts receivable sold.
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Accounting Standards Update and Change in Accounting Principle [Abstract]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Long term debt and other securities issued, retired and principal payments made [Abstract]
Long-term debt and other securities issued, retired and principal payments made.
Common Stock
Common Stock, Value, Issued
Investments by Consolidated and Nonconsolidated Entities [Domain]
Investments by Consolidated and Nonconsolidated Entities [Domain]
Impact on Pretax Earnings due to Loss of Significant Contract
Impact on Pretax Earnings due to Loss of Significant Contract
This amount represents the impact on pretax earnings due to the loss of a significant contract.
Document Fiscal Year Focus
Document Fiscal Year Focus
Tangible Capital to Tangible Assets
Banking Regulation, Tangible Capital Ratio, Actual
Other Noncurrent Assets
Assets, Noncurrent [Abstract]
Initial Phased in Annual Increase
Initial Phased in Annual Increase
Amount of approved annual revenue increase that will be phased in initially.
Long-term Debt Due Within One Year
Long-term Debt Due Within One Year
Long-term Debt, Current Maturities
Entity Current Reporting Status
Entity Current Reporting Status
Trust Assets [Domain]
Trust Assets [Domain]
[Domain] for Trust Assets [Axis]
Interest Income
Interest Income
Investment Income, Interest and Dividend
Risk Management Assets
Derivative Asset [Abstract]
Basis Points Over Authorized Return on Equity Considered Excess Earnings
Basis Points Over Authorized Return on Equity Considered Excess Earnings
The amount of basis points over the authorized ROE considered Excess Earnings.
Maturity of Credit Facility [Axis]
Maturity of Credit Facility [Axis]
Maturity of Credit Facility
Trent and Desert Sky Wind Farms [Member]
Trent and Desert Sky Wind Farms [Member]
Trent and Desert Sky Wind Farms [Member]
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease)
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease)
Wind Generation MWs
WindGenerationMWs
Wind Generation (MWs)
Earnings Per Share
Earnings Per Share, Policy [Policy Text Block]
TOTAL COMPREHENSIVE INCOME (LOSS)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Margin Deposits
Margin Deposit Assets
Cash and Cash Equivalents
Cash and Cash Equivalents at Beginning of Period
Cash and Cash Equivalents at End of Period
Cash and Cash Equivalents, at Carrying Value
Beginning Balance, Shares
Ending Balance, Shares
Common Stock, Shares, Issued
Common Stock, Shares, Issued
Amount of Increase Related to Annual Depreciation Rates due to Increased Depreciation Expense
Amount of Increase Related to Annual Depreciation Rates due to Increased Depreciation Expense
Increase related to annual depreciation rates due to increased depreciation expense requested.
Regulatory Assets Currently Not Earning Return [Member]
Regulatory Assets Currently Not Earning Return [Member]
Regulatory Assets Currently Not Earning a Return
Interest Rate
Interest Rate [Abstract]
Delinquent Securitized Accounts Receivable
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement
Carrying Amount of Hedged Asset (Liability)
Carrying Amount of Hedged Asset (Liability)
Carrying Amount of Hedged Asset (Liability)
Long-term Debt
Long-term Debt
Long-term Debt, Excluding Current Maturities
Segment Reporting [Abstract]
Segment Reporting [Abstract]
TOTAL COMMON SHAREHOLDER'S EQUITY
Stockholders' Equity Attributable to Parent
Nonutility [Member]
Nonutility [Member]
Nonutility Company.
Common Stock Dividends
Affiliated Dividends Common Stock
Equity impact of aggregate cash, stock, and paid-in-kind dividends declared to an entity that is affiliated with the reporting entity by means of direct or indirect ownership.
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss)
Total MTM Derivative Contract Net Assets (Liabilities)
Derivative Assets (Liabilities), at Fair Value, Net
Change in Fair Value Recognized in AOCI
Other Comprehensive Income Unrealized Gain Loss Arising During Period Net Of Tax
Net of tax amount, before reclassification adjustments, of the change in accumulated gain (loss).
Fuel
Inventory, Raw Materials, Gross
Entity Address, City or Town
Entity Address, City or Town
Notes Payable
Notes Payable
2020 Equity Units [Member]
2020 Equity Units [Member]
Equity Units issued in August 2020
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
Trust Assets for Decommissioning and Spent Nuclear Fuel Disposal
Trust Assets For Decommissioning And Spent Nuclear Fuel Disposal (Policy) [Text Block]
Element used to describe policy for trust assets for decommissioning and spent nuclear fuel disposal.
Schedule of Trading Securities and Other Trading Assets, Major Types of Trading Securities and Assets [Axis]
Financial Instrument [Axis]
Financial Instrument [Axis]
Derivative, Energy Notional Amount
Derivative Nonmonetary Energy Notional Amount
Volume of energy derivative contracts.
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool [Abstract]
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool.
Requested Return on Equity
Public Utilities, Requested Return on Equity, Percentage
Risk Management Contracts [Member]
Risk Management Commodity Contracts [Member]
Risk Management Commodity Contracts [Member]
Risk Management Contracts Member.
Change in Other Noncurrent Assets
Increase (Decrease) in Other Noncurrent Assets
Revenue from Contract with Customer
Revenue from Contract with Customer [Policy Text Block]
Glen Lyn Station [Member]
Glen Lyn Station [Member]
Glen Lyn Station
Notional Volume of Derivative Instruments
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]
Other Retail [Member]
Other Retail [Member]
Revenues from retail classes other than residential, commercial and industrial.
Other Current Liabilities
Other Liabilities, Current
Other Comprehensive Income (Loss), Net of Tax, Total
Other Comprehensive Income (Loss)
Net Current Period Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss), Net of Tax
AFUDC Equity
Effective Income Tax Rate Reconciliation AFUDC Equity Percentage
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations due to AFUDC Equity.
Affiliated Companies
Accounts Payable, Related Parties, Current
Taxes Other Than Income Taxes
Taxes, Miscellaneous
Debt and Equity Securities Within Other Temporary Investments
Debt and Equity Securities Within Other Temporary Investments [Text Block]
Debt and equity securities within Other Temporary Investments.
Long-term Debt, Type [Axis]
Long-term Debt, Type [Axis]
TOTAL CURRENT ASSETS
Assets, Current
Total Comprehensive Income (Loss) Attributable to Noncontrolling Interest
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest
Earnings Per Share
Basic and Diluted EPS Calculations
Earnings Per Share [Abstract]
Securitization Bonds Three [Member]
Securitization Bonds Three [Member]
Securitization Bonds Three [Memeber]
Amortization of Prior Service Cost (Credit)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax
State Income Tax, net of Federal Benefit
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent
Amortization Of Pension And Other Postretirement Benefit Plans
Amortization Of Pension And Other Postretirement Benefit Plans [Abstract]
Affiliated and Nonaffiliated [Member]
Affiliated and Nonaffiliated [Member]
Includes affiliated and nonaffiliated revenues.
Payments for (Proceeds from) Removal Costs
Payments for (Proceeds from) Removal Costs
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Pension and OPEB [Member]
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
The NASDAQ Stock Market LLC
NASDAQ - ALL MARKETS [Member]
Deferred Income Taxes
Deferred Tax Liabilities, Net, Noncurrent
Equity
Stockholders' Equity Attributable to Parent [Abstract]
Document Fiscal Period Focus
Document Fiscal Period Focus
Gross Unrealized Gains
Available-for-sale Securities, Gross Unrealized Gain
Stock Issued During Period, Shares, Reverse Stock Splits
Stock Issued During Period, Shares, Reverse Stock Splits
Purchases of Investments
Payments to Acquire Available-for-sale Securities
Oklaunion Generating Station [Member]
Oklaunion Generating Station (Unit No. 1) [Member]
Oklaunion Generating Station (Unit No. 1) Member
Kentucky Power Co [Member]
Kentucky Power Co [Member]
Kentucky Power Company Member
Texas Jurisdictional Share of Turk Plant
Texas Jurisdictional Share of Turk Plant
Texas jurisdictional share of the Turk Plant
Entity Filer Category
Entity Filer Category
Common Stock [Member]
Common Stock [Member]
Approved Net Increase in Texas Annual Revenues
Approved Net Increase in Texas Annual Revenues
Net Increase in approved Texas Annual Revenues
Product and Service [Domain]
Product and Service [Domain]
Intervenor Recommended Annual Increase
Intervenor Recommended Annual Increase
Intervenor recommended increase in annual rates.
Concentration Risk Benchmark [Domain]
Concentration Risk Benchmark [Domain]
Regulatory Assets Pending Final Regulatory Approval
Schedule of Regulatory Assets [Table Text Block]
Notes Receivable, Related Parties
Notes Receivable, Related Parties
Other Short-term Debt
Short-term Bank Loans and Notes Payable
Notes Payable, Other Payable Three [Member]
Notes Payable, Other Payable Three [Member]
A written promise to pay a note to a third party.
Gross Realized Gains on Investment Sales
Available-for-sale Securities, Gross Realized Gain (Loss)
Contractual Maturities, Fair Value of Debt Securities
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Other-Than-Temporary Impairments
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities
Interest Rate (Percentage)
Debt Instrument, Interest Rate, Stated Percentage
Maximum Potential Amount of Future Payments Associated with Guarantee
Maximum Potential Amount of Future Payments Associated with Guarantee
Maximum Potential Amount of Future Payments Associated with Guarantee
Retail, Trading and Marketing Revenues [Member]
Marketing, Competitive Retail and Renewable [Member]
Marketing, Competitive Retail and Renewable [Member]
Rockport Lease [Member]
Rockport Lease [Member]
Lease Type One.
Level 3 Quantitative Information
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Net Increase (Decrease) in Cash and Cash Equivalents
Cash and Cash Equivalents, Period Increase (Decrease)
Virginia Jurisdictional AMR Meters [Member]
Virginia Jurisdictional AMR Meters [Member]
Virginia Jurisdictional AMR Meters [Member]
Public Utility [Axis]
Public Utility [Axis]
Acquisitions of Nuclear Fuel
Payments for Nuclear Fuel
Treasury Stock, Shares
Treasury Stock, Shares
Generation
Gross Investment Including CWIP
Public Utilities, Property, Plant and Equipment, Generation or Processing
Industrial [Member]
Industrial [Member]
Retail revenues from the industrial class.
maturityofcreditfacility [Domain]
maturityofcreditfacility [Domain]
[Domain] for maturityofcreditfacility [Axis]
Cash Paid for Interest, Net of Capitalized Amounts
Interest Paid, Excluding Capitalized Interest, Operating Activities
Senior Unsecured Notes [Member]
Senior Unsecured Notes [Member]
A senior note is a bond that takes priority over other debt securities sold by the issuer, in the event the issuer goes bankrupt, senior debt holders receive priority for [must receive] repayment [prior] relative to junior and unsecured [general] creditors.
Dilutive Securities, Effect on Basic Earnings Per Share
Dilutive Securities 1
Includes adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.
Contingently Reedemable Performance Share Awards
Mezzanine Equity
The fair value as of the balance sheet date of contingently redeemable performance share awards.
Beginning Balance
Ending Balance
TOTAL EQUITY
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest
Paid-in Capital
Additional Paid in Capital
Additional Paid in Capital
TOTAL REVENUES
Total Revenues
Revenues
Impact of Fair Value Hedges on the Condensed Balance Sheet
Impact of Fair Value Hedges on Balance Sheet [Table Text Block]
Impact of Fair Value Hedges on Condensed Balance Sheet [Table Text Block]
Net Cash Paid (Received) for Income Taxes
Income Taxes Paid, Net
AEP Transmission Holdco [Member]
Transmission Operations [Member]
Transmission Operations Member.
Total Diluted Earnings Per Share Attributable to AEP Common Shareholders
Earnings Per Share, Diluted
Short Term Debt
Schedule of Short-term Debt [Table Text Block]
Transource Energy [Member]
Transource Energy [Member]
Transource Energy [Member]
Maximum Interest Rate
Maximum Interest Rate
The maximum weighted-average interest rate of funds outstanding at that time, calculated on a daily basis, either borrowed from or loaned to a Money Pool during the period. The Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries.
Long-term Debt
Schedule of Debt [Table Text Block]
Cash Flow Hedges, Tax
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax
Accounts Receivable:
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]
Reconciling Adjustments [Member]
Consolidation Eliminations [Member]
Consolidation, Eliminations [Member]
Entity Address, Address Line One
Entity Address, Address Line One
Collateral Triggering Events [Abstract]
Collateral Triggering Events [Abstract]
Collateral Triggering Events Abstract.
Entity Emerging Growth Company
Entity Emerging Growth Company
Lump Sum Salary Payments and Cash Subsidies [Member]
Lump Sum Salary Payments and Cash Subsidies [Member]
Lump Sum Salary Payments and Cash Subsidies
Reclassifications From Accumulated Other Comprehensive Income
Reclassifications From Accumulated Other Comprehensive Income [Abstract]
Deferred Income Taxes
Deferred Income Tax Expense (Benefit)
Other Revenues - Affiliated
Related Party Transaction, Other Revenues from Transactions with Related Party
Changes in Fair Value of Net Trading Derivatives and Other Investments
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Major Property Class [Axis]
Major Property Class [Axis]
Utility Plant [Domain]
Utility Plant [Domain]
Public Utilities, General Disclosures [Abstract]
Public Utilities, General Disclosures [Abstract]
Generating Units Probable of Abandonment [Member]
Generating Units Probable of Abandonment [Member]
Generating Units Probable of Abandonment [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss)
Maximum [Member]
High [Member]
Maximum [Member]
Requested Annual Increase
Requested Annual Increase
Requested annual increase.
Noncontrolling Interests [Member]
Noncontrolling Interest [Member]
Noncontrolling Interest [Member]
Purchases of Investments
Payments to Acquire Short-term Investments
Approved Return on Common Equity
Public Utilities, Approved Return on Equity, Percentage
Dividends Paid on Common Stock
Payments of Distributions to Affiliates
Effective Income Tax Rate
Effective Income Tax Rate Reconciliation, Percent
2026 - 2032 [Member]
Maturity Period Four [Member]
Regulated Status [Domain]
Regulated Status [Domain]
Regulated Status Domain
Revenue, Performance Obligation [Abstract]
Revenue, Performance Obligation [Abstract]
Long-term Accounts Receivable - Affiliated
Increase (Decrease) in Accounts Receivable, Related Parties
Other Postretirement Benefit Plans [Member]
Other Postretirement Benefits Plan [Member]
Trading Symbol
Trading Symbol
Sales to AEP Affiliates
Revenue from Related Parties
Revenue from Related Parties
Amortization of Nuclear Fuel
Amortization of Nuclear Fuel
The expense charged against earnings for the periodic recognition of nuclear fuel usage.
Additional Refund for Current Year Tax Reform Rate Change
Additional Refund for Current Year Tax Reform Rate Change
Additional refund for current year tax reform rate change as recommended by staff.
Jointly Owned Utility Plant [Axis]
Jointly Owned Utility Plant [Axis]
Fixed Performance Obligations
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]
Regulation Status [Axis]
Regulation Status [Axis]
Securities Activity Within Decommissioning and SNF Trusts
Securities Activity Within Decommissioning and SNF Trusts [Abstract]
Securities Activity Within Decommissioning And Snf Trusts.
Maximum Future Payments for Letters of Credit [Abstract]
Maximum Future Payments for Letters of Credit [Abstract]
Entity Shell Company
Entity Shell Company
Spent Nuclear Fuel and Decommissioning Trusts
Nuclear Fuel and Decommissioning Trusts [Abstract]
Nuclear Fuel and Decommissioning Trusts Abstract.
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
Regulatory Asset Return Disclosure [Axis]
Regulatory Asset Return Disclosure [Axis]
Regulatory Asset Return Disclosure Axis
Document Type
Document Type
Other Income
Other Nonoperating Income (Expense)
Storm Related Costs - Louisiana
Storm Related Costs - Louisiana [Member]
Storm Related Costs - Louisiana
Maturity Of Fair Value Risk Management Contracts [Axis]
Maturity Of Fair Value Risk Management Contracts [Axis]
AEP Texas Transition Funding and Restoration Funding [Member]
AEP Texas Transition Funding and Restoration Funding [Member]
AEP Texas Transition and Restoration Funding [Member]
Segments [Axis]
Segments [Axis]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Benefit Plans
Retirement Benefits [Text Block]
Cash Flow Hedges, Net of Tax
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Schedule of Accumulated Other Comprehensive Income (Loss)
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
COVID-19 Electricity Relief Program Loan
Short-term Non-bank Loans and Notes Payable
Max Potential Loss on Master Lease Agreements
Max Potential Loss on Master Lease Agreements [Table Text Block]
Max potential loss on master lease agreements.
Level 3 [Member]
Fair Value, Inputs, Level 3 [Member]
Guarantor Obligations, Nature [Domain]
Guarantor Obligations, Nature [Domain]
AEP Share Of ETT Cumulative Revenues Subject To Review
AEP Share Of ETT Cumulative Revenues Subject To Review
AEP's share of ETT's cumulative revenues, subject to review, based upon interim rate increases.
Total Assets
Risk Management Assets
Derivative Asset
Construction Expenditures
Payments for Construction in Process
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
Utility Money Pool Participants Money Pool Activity And Authorized Borrowing Limits [Text Block]
Tabular disclosure of a Utility Money Pool participants' money pool activity and authorized borrowing limits including: (1) Maximum Borrowings from Utility Money Pool; (2) Maximum Loans to Utility Money Pool; (3) Average Borrowings from Utility Money Pool; (4) Average Loans to Utility Money Pool; (5) Net Loans (Borrowings) to/from Utility Money Pool as of the balance sheet date; (6) Authorized Short-term Borrowing Limit. The Utility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain utility subsidiaries.
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge
Change in Other Noncurrent Liabilities
Increase (Decrease) in Other Noncurrent Liabilities
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member]
Gross Amounts of Risk Management Assets Liabilities Recognized [Member]
Gross Amounts of Risk Management Assets/Liabilities Recognized.
Derivatives and Hedging
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Proceeds from Issuance of Debt
Proceeds from Issuance of Debt
Other Long Term Debt Three [Member]
OtherLongTermDebtThree [Member]
OtherLongTermDebtThree
Money Pool Participant by Company Type [Axis]
Money Pool Participant by Company Type [Axis]
Money Pool Participant by Company Type.
Accounts Receivable, Net
Increase (Decrease) in Accounts and Other Receivables
OPERATING INCOME (LOSS)
Operating Income (Loss)
Amount of Gain (Loss) Recognized on Risk Management Contracts
Gain (Loss) on Derivative Instruments, Net, Pretax [Abstract]
State Transcos [Member]
State Transcos [Member]
State Transcos [Member]
Total Principal Outstanding
Principal Amount Outstanding on Loans Held-for-sale or Securitization or Asset-backed Financing Arrangement
Noncash or Part Noncash Acquisition, Debt Assumed
Noncash or Part Noncash Acquisition, Debt Assumed
Pledged Accounts Receivable - AEP Credit
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount
ARO Type [Axis]
ARO Type [Axis]
ARO Type
Investments by Consolidated and Nonconsolidated Entities [Axis]
Investments by Consolidated and Nonconsolidated Entities [Axis]
Commitments and Contingencies
Commitments and Contingencies
Principal Amounts of Junior Subordinated Debt
Principal Amounts of Junior Subordinated Debt
Principal Amounts Of Junior Subordinated Debt. The dollar amount that notes are broken into.
Accrued Taxes
Taxes Payable, Current
Entity Address, State or Province
Entity Address, State or Province
Accounts Payable
Accounts Payable, Current
ETT Interim Transmission Rates [Member]
ETT Interim Transmission Rates [Member]
ETT Interim Transmission Rates [Member]
Risk Management Assets
Current Risk Management Assets
Derivative Asset, Current
Securitization Bonds
Secured Debt
Retained Earnings
Retained Earnings (Accumulated Deficit)
Operating Lease Assets
Operating Lease, Right-of-Use Asset
AEP Wind Holdings LLC [Member]
AEP Wind Holdings LLC [Member]
AEP Wind Holdings LLC [Member]
Average Borrowings from Money Pool
Average Borrowings from Money Pool
Average Borrowings from a Money Pool during the period. The Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries.
Boat and Barge Leases [Member]
Boat and Barge Leases [Member]
Boat and Barge Leases [Member]
Maintenance Expense [Member]
Maintenance Expense [Member]
Maintenance expense.
Pollution Control Bond Three [Member]
Pollution Control Bond Three [Member]
Pollution Control Bond Three
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member]
Net Amounts of Assets Liabilities Presented in Statement of Financial Position [Member]
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position.
Plant Retirement Costs - Unrecovered Plant [Member]
Plant Retirement Costs - Unrecovered Plant [Member]
Plant Retirement Costs - Unrecovered Plant [Member]
Asset Retirement Obligation (ARO)
Schedule of Change in Asset Retirement Obligation [Table Text Block]
Supplementary Information
Supplementary Information [Text Block]
Supplementary Information.
Redemption of Short-term Debt with Original Maturities Greater than 90 Days
Repayments of Short-term Debt, Maturing in More than Three Months
Amount of Cash Collateral Posted
Collateral Already Posted, Aggregate Fair Value
Long-term Debt Issuances
Long Term Debt and Other Securities Issued [Text Block]
This element may be used as a single block of text to encapsulate long-term debt and other securities issued during the period.
Other Investing Activities
Payments for (Proceeds from) Other Investing Activities
Approved Item [Domain]
Approved Item [Domain]
[Domain] for Approved Item [Axis]
Beginning Balance
Ending Balance
Asset Retirement Obligation
Issuance of Short-term Debt with Original Maturities greater than 90 Days
Proceeds from Short-term Debt, Maturing in More than Three Months
Construction Work in Progress
Construction in Progress, Gross
Regulatory Liabilities [Member]
Regulatory Liabilities [Member]
Regulatory Liabilities.
Nuclear Trust Fund Investments
Nuclear Trust Fund Investments [Text Block]
Nuclear trust fund investments.
Securitization Bonds Two [Member]
Securitization Bonds Two [Member]
A collateralized debt obligation (backed by pledge, mortgage or other lien on the entity's assets).
Southwestern Electric Power Co [Member]
Southwestern Electric Power Co [Member]
Southwestern Electric Power Company Member
Regulated and Unregulated Operation [Domain]
Regulated and Unregulated Operation [Domain]
Fixed Income Funds [Member]
Fixed Income Funds [Member]
Forecast [Member]
Forecast [Member]
Minimum Interest Rate For Funds Borrowed
Minimum Interest Rate For Funds Borrowed
The minimum weighted-average interest rate of funds outstanding at that time, calculated on a daily basis, borrowed during the period.
Contract with Customer, Duration [Domain]
Contract with Customer, Duration [Domain]
Accrued Interest
Interest Payable, Current
COVID-19 - West Virginia
COVID-19 - West Virginia [Member]
COVID-19 - West Virginia
Public Utilities, General Disclosures [Line Items]
Public Utilities, General Disclosures [Line Items]
Previously Collected Rates Subject to Reconciliation [Member]
Previously Collected Rates Subject to Reconciliation [Member]
Previously Collected Rates Subject to Reconciliation [Member]
Junior Subordinated Notes
Junior Subordinated Notes
Common Stock, No Par Value
Common Stock, No Par Value
Parent Company Loss Benefit
Effective Income Tax Rate Reconciliation Parent Company Loss Benefit Percentage
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations due to Parent Company Loss Benefit.
2019 Indiana Base Rate Case [Member]
2019 Indiana Base Rate Case [Member]
2019 Indiana Base Rate Case [Member]
Staff Calculated Return during Triennial Period
Staff Calculated Return during Triennial Period
The staff's calculated return during the Triennial period.
Interest Rate (Variable)
Debt Instrument Interest Variable Rate
The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.
Flow Through
Effective Income Tax Rate Reconciliation Flow Through Percentage
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations due to Flow Through.
US Government Agencies Debt Securities [Member]
US Government Agencies Debt Securities [Member]
Disallowed Item in Commission Order
Disallowed Item in Commission Order
An item that is disallowed in a commission order.
Long-term Risk Management Liabilities
Long-term Risk Management Liabilities
Derivative Liability, Noncurrent
Rate Matters
Rate Matters
Describes all of the specific events that have or may impact rates and amortization of regulatory assets and liabilities (for example, pending or recently concluded regulatory proceedings, environmental requirements). Specifics may include quantifications related to rates, costs and earnings. Events may relate to rate moratoriums or price caps.
Percent of Fuel Supply Provided by DHLC
Percent of Fuel Supply Provided by DHLC
The percentage of fuel supply provided by DHLC to Dolet Hills Power Station.
Vertically Integrated Utilities [Member]
Vertically Integrated Utilities [Member]
Electricity [Member]
Kentucky Tax Reform [Member]
Kentucky Tax Reform [Member]
Kentucky Tax Reform
Equity Method Investments [Member]
Equity Method Investments [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjusted Cost of Debt Securities
Adjusted cost of debt securities
Adjusted cost of debt securities.
Issuance of Common Stock
Proceeds from Issuance of Common Stock
Conesville Generating Station [Member]
Conesville Generating Station (Unit No. 4) [Member]
Conesville Generating Station (Unit No. 4) Member
Borrowings from Parent
Borrowings from Parent
Borrowings from Parent at period end. Parent represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries.
Transmission Portion of the Impact of 2019 Depreciation Rates on 2020
Transmission Portion of the Impact of 2019 Depreciation Rates on 2020
Staff recommended 2019 depreciation rates should be implemented effective January 2020. This amount represents the transmission portion of the total impact on 2020.
Amortization of Pension and OPEB Deferred Costs, Tax
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax
Valuation Techniques
Fair Value Measurement, Policy [Policy Text Block]
Forward Equity Purchase Contract Date
Forward Equity Purchase Contract Date
Forward Equity Purchase Contract Date
Net Cash Flows from (Used for) Operating Activities
Net Cash Provided by (Used in) Operating Activities
Entity Central Index Key
Entity Central Index Key
Acquisition
Acquisition
Noncash or Part Noncash Acquisition, Other Assets Acquired
Notes Payable, Other Payable Two [Member]
Notes Payable, Other Payable Two [Member]
A written promise to pay a note to a third party.
Derivative Instrument [Axis]
Derivative Instrument [Axis]
Net Loans (Borrowings) to/from Money Pool
Related Party Transaction, Due from (to) Related Party
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets by Major Class [Axis]
Unbilled Receivables Related to Securitization, Sale of Accounts Receivable
Unbilled Receivables Related to Securitization, Sale of Accounts Receivable
The amount of revenue for work performed for which billing has not occurred related to securitization of accounts receivable.
Hurricane Delta [Member]
Hurricane Delta [Member]
Hurricane Delta
Accrued Tax Benefits
Income Taxes Receivable, Current
Ohio Power Co [Member]
Ohio Power Co [Member]
Ohio Power Company Member
Plant Retirement Costs - Asset Retirement Obligation Costs [Member]
Asset Retirement Obligation Related to Retired Plants [Member]
Asset Retirement Obligation Related to Retired Plants [Member]
Segments [Domain]
Segments [Domain]
Non-Service Cost Components of Net Periodic Benefit Cost
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component
Amount of Gain (Loss) Recognized on Risk Management Contracts
Schedule of Derivative Instruments Included in Trading Activities [Table Text Block]
Statement of Cash Flows [Abstract]
Statement of Cash Flows [Abstract]
Effective Interest Rates on Securitization of Accounts Receivable
Effective Interest Rates on Securitization of Accounts Receivable
Effective interest rate on the amount owed for securitized accounts receivables.
Changes in Fair Value Allocated to Regulated Jurisdiction
Changes in Fair Value Allocated to Regulated Jurisdiction
This element represents total gains or losses for the period (realized and unrealized), arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are allocated to regulated jurisdictions.
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Cash [Member]
Cash [Member]
Direct Borrowing Activity
Direct Borrowing Activity [Table Text Block]
[Table Text Block] for Tabular disclosure of the Direct borrowing participants; activity including: (1) Maximum borrowings from AEP; (2) Maximum Loans to AEP; (3) Average Borrowings from AEP; (4) Average Loans to AEP; (5) Borrowings from AEP as of the balance sheet date; (6) Loans to AEP as of the balance sheet date. Direct Borrowing represents centralized funding mechanism AEP uses to meet the short-term cash requirement of certain subsidiaries.
2020 [Member]
Within Current Year [Member]
Maturity of risk management contracts within current year.
Guarantee Obligations Current Carrying Value Other Liabilities Noncurrent
GuaranteeObligationsCurrentCarryingValueOtherLiabilitiesNoncurrent
The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees under Other Noncurrent Liabilities.
Derivative, Notional Amount
Derivative, Notional Amount
Resulting Approved Base Rate Increase
Resulting Approved Base Rate Increase
The resulting annual base rate increase subsequent to recent rulings.
Regulatory Assets Currently Earning Return [Member]
Regulatory Assets Currently Earning Return [Member]
Regulatory Assets Currently Earning a Return
Securitized Debt for Receivables - AEP Credit
Securitized Debt for Receivables
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount
Amount of Increase Related to Annual Depreciation Expense
Amount of Increase Related to Annual Depreciation Expense
The amount of requested increase related to annual depreciation expense.
Proceeds from Income Tax Refunds
Proceeds from Income Tax Refunds
Business Segments
Segment Reporting Disclosure [Text Block]
Issuance of Common Stock, Value
Stock Issued During Period, Value, New Issues
Maximum Percentage Debt to Capitalization
Maximum Percentage Debt to Capitalization
Maximum level of debt to capitalization persuant to credit agreement leverage restrictions.
2020 Kentucky Base Rate Case [Member]
2020 Kentucky Base Rate Case [Member]
2020 Kentucky Base Rate Case
Asset Retirement Obligations (ARO)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Scenario [Axis]
Scenario [Axis]
Risk Management Liabilities
Current Risk Management Liabilities
Derivative Liability, Current
Guarantor Obligations, Current Carrying Value, Contingent Portion
Guarantor Obligations, Current Carrying Value, Contingent Portion
The contingent portion of the current carrying amount of the liability for the freestanding or embedded guarantee or each group of similar guarantees.
Item to be Refunded in Commission Order
Item to be Refunded in Commission Order
An item to be refunded in commission order.
Title of 12(b) Security
Title of 12(b) Security
Amount of Increase Related to Calculated Shortfall
Amount of Increase Related to Calculated Shortfall
Amount of increase related to calculated shortfall in base rate case.
Regulatory Assets Pending Final Regulatory Approval [Member]
Regulatory Assets Pending Final Regulatory Approval [Member]
Regulatory Assets Pending Final Regulatory Approval [Member]
Short-term Contract with Customer [Member]
Short-term Contract with Customer [Member]
Net Uncollectible Accounts Receivable Written Off
Net Uncollectible Accounts Receivable Written Off
Net uncollectible accounts receivable written off.
Interest Expense
Interest Expense
Interest Expense
Interest Expense
Employee Benefits and Pension Obligations
Employee Benefits and Pension Obligations
Element represents the noncurrent liability recognized on the balance sheet that is associated with employee benefit and pension obligations including, but not limited to, defined benefit pension plans, other postretirement defined benefit plans, deferred incentive compensation and other postemployment benefits.
Forward Equity Purchase Contract Included in Current and Noncurrent Liabilities as of September 30
Forward Equity Purchase Contract Included in Current and Noncurrent Liabilities as of September 30
Stockholders' Equity, Other
New Accounting Standards
Accounting Standards Update and Change in Accounting Principle [Table Text Block]
Amortization of Generation Deferrals
Amortization Of Generation Deferrals
Amortization Of Generation Deferrals
Amortizations related to recoveries of pre-2012 deferred fuel balances that are recovered by the Phase In Recovery Rider. Amortizations related to recoveries of deferred capacity costs that are recovered by the Retail Stability Rider ($4.00/MWh recovery of previously deferred OPCo capacity costs and previously deferred carrying costs per Case No. 14-1186-EL-RDR & March 2017 through June 2019 monthly amortization of remaining RSR capacity costs using the appropriate incremental rate multiplied by the current monthly RSR rider revenue).
Product and Service [Axis]
Product and Service [Axis]
Gross Realized Losses on Investment Sales
Gross Realized Losses On Investment Sales On Short Term Investment
Gross Realized Losses On Investment Sales On Short Term Investment.
Impairment Charge Welsh Plant, Unit 2
Impairment Charge Welsh Plant, Unit 2
Impairment recorded due to lack of return on Welsh Plant Unit 2.
Sabine Mining Co [Member]
Sabine Mining Co [Member]
Sabine Mining Company Variable Interest Entity Member
Interest Rate [Member]
Interest Rate [Member]
Interest Rate Member.
Other Long-term Debt
Other Long-term Debt
Provision for Refund
Accumulated Provisions For Rate Refunds
Refunds for costs collected in formula rates.
Maximum Minimum and Average Interest Rates for Funds Borrowed from and Loaned to AEP
Maximum Minimum and Average Interest Rates for Funds Borrowed from and Loaned to AEP [Table Text Block]
[Table Text Block] for Tabular disclosure of the maximum and minimum weighted-average interest rate, calculated on a daily basis and the average interest rates of funds borrowed from or loaned to AEP during the period. The Direct Borrowing represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries.
Earnings Attributable to Common Shareholders
Net Income (Loss)
Net Income (Loss) Available to Common Stockholders, Basic
Notes Payable
Other Notes Payable
Transmission And Distribution Utilities [Member]
Transmission And Distribution Companies [Member]
Transmission And Distribution Companies [Member]
Asset Retirement Obligation, Liabilities Settled
Liabilities Settled
Asset Retirement Obligation, Liabilities Settled
Net Book Value of Retired Plants
Net Book Value of Retired Plants
Net Book Value of Retired Plants, before cost of removal, including materials and supplies.
Refund for Current Year Tax Reform Rate Change
Refund for Current Year Tax Reform Rate Change
Amount of refund to be given through rate reductions, riders, etc related to over-collection of current year taxes as a result of Tax Reform.
Refund for Excess ADIT Not Subject to Rate Normalization Requirements
Refund for Excess ADIT Not Subject to Rate Normalization Requirements
Amount of refund to be given through rate reductions, riders, etc related to Excess ADIT Not Subject to Rate Normalization Requirements.
Accounts Payable
Increase (Decrease) in Accounts Payable
Mark-to-Market of Risk Management Contracts
Unrealized Gain (Loss) on Derivatives
Maximum Term for Exposure to Variability of Future Cash Flows
Maximum Length of Time Hedged in Price Risk Cash Flow Hedge
Noncash or Part Noncash Acquisition, Value of Assets Acquired
Noncash or Part Noncash Acquisition, Value of Assets Acquired
Refund for Excess ADIT
Refund for Excess ADIT
Amount of refund to be given through rate reductions, riders, etc related to Excess ADIT.
2020 Texas Base Rate Case [Member]
2020 Texas Base Rate Case [Member]
2020 Texas Base Rate Case
Fair Value Hedges [Member]
Fair Value Hedging [Member]
Notes Payable, Other Payable Five [Member]
Notes Payable, Other Payable Five [Member]
A written promise to pay a note to a third party.
Antidilutive Securities, Name [Domain]
Antidilutive Securities, Name [Domain]
Louisiana Jurisdiction [Member]
Louisiana Jurisdiction [Member]
Louisiana Jurisdiction
Equity Units Issued
Equity Units Issued
The amount of AEP Equity Units Issued in connection with the March 2019 issuance of Junior Subordinated Notes.
Fair Value Assets and Liabilities Measured on Recurring Basis
Fair Value Assets And Liabilities Measured On Recurring Basis (Policy) [Text Block]
Element describes policy for fair value assets and liabilities measured on recurring basis.
Carrying Costs Income
Carrying Costs Income
Carrying Costs Income
Income recorded to accrue a return on certain regulatory assets as granted by a regulator.
Total Liabilities
Risk Management Liabilities
Derivative Liability
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Customers
Accounts Receivable, before Allowance for Credit Loss, Current
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Abstract]
Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition
Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition
Trust fund assets one time fee obligation for nuclear fuel disposition.
Entity Information [Line Items]
Entity Information [Line Items]
Affiliated Long-term Debt Due Within One Year
Affiliated Long Term Debt Current
Total of the portions of the affiliated carrying amounts as of the balance sheet date of long-term debt, which may include notes payable, bonds payable, debentures, mortgage loans, and commercial paper, which are scheduled to be repaid within one year or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.
2016 Texas Base Rate Case [Member]
2016 Texas Base Rate Case [Member]
2016 Texas Base Rate Case [Member]
Income Taxes Receivable
Income Taxes Receivable
Other Asset Impairment Charges
Other Asset Impairment Charges
Subsequent Event [Member]
Subsequent Event [Member]
Change in Regulatory Assets
Change in Regulatory Assets
The increase (decrease) during the reporting period in regulatory assets.
Vertically Integrated Utilities [Member]
Vertically Integrated Utilities [Member]
Vertically Integrated Utilities [Member]
2020 [Member]
Less Than 1 Year [Member]
Time period in which fixed performance obligations will be satisfied.
Authorized Short Term Borrowing Limit
Authorized Short Term Borrowing Limit
Authorized Short-term Borrowing Limit by regulatory orders.
Requested Net Increase in Texas Annual Revenues
Requested Net Increase in Texas Annual Revenues
Requested net increase in Texas annual revenues.
Equity Units Annual Distribution Rate
Equity Units Annual Distribution Rate
Equity Units Annual Distribution Rate
Other Short-term Investments
Other Short-term Investments
Obligations Under Operating Leases
Operating Lease, Liability, Noncurrent
Coal Combustion By-Product Expense [Member]
Coal Combustion By-Product Expense [Member]
Coal Combustion By-Product Expense
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool
Average Interest Rates For Funds Borrowed From And Loaned To Utility Money Pool [Text Block]
Tabular disclosure of the average interest rates for funds borrowed from and loaned to a Utility Money Pool. The Utility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain utility subsidiaries.
Accounts Receivable Retained Interest and Pledged as Collateral Less Uncollectible Accounts
Accounts Receivable Retained Interest and Pledged as Collateral Less Uncollectible Accounts
Accounts receivables that have been pledged as collateral less uncollectible accounts as of the balance sheet date.
Amortization of Pension and OPEB Deferred Costs, Net of Tax
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Notes Payable, Other Payable Four [Member]
Notes Payable, Other Payable Four [Member]
A written promise to pay a note to a third party.
Current Assets
Assets, Current [Abstract]
Louisiana 2018 Formula Rate Filing [Member]
Louisiana 2018 Formula Rate Filing [Member]
Louisiana 2018 Formula Rate Filing [Member]
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO COMMON SHAREHOLDERS
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Gain (Loss) on Fair Value Portion of Long Term Debt
Gain (Loss) on Fair Value Portion of Long Term Debt
Gain (Loss) on fair value portion of long-term debt.
Adjusted Requested Annual Increase
Adjusted Requested Annual Increase
Adjusted annual increase request due to various factors such as true up of historical information.
Schedule of Effective Income Tax Rate Reconciliation
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
City Area Code
City Area Code
Legal Entity [Axis]
Legal Entity [Axis]
Staff Recommended Adjustment to Company's Annual Increase
Staff Recommended Adjustment to Company's Annual Increase
Items that staff recommended as part of adjustment to company's annual increase.
Parent Ownership Interest In ETT
Parent Ownership Interest In ETT
Parents equity ownership interest in ETT.
Document Period End Date
Document Period End Date
Amount of Gain (Loss) Recognized on Risk Management Contracts
Gain (Loss) on Derivative Instruments, Net, Pretax
West Virginia ENEC and Vegetation Management Riders [Member]
West Virginia ENEC and Vegetation Management Riders [Member]
West Virginia ENEC and Vegetation Management Riders
Present Value of Future Minimum Lease Payments, Sale Leaseback Transactions, Fiscal Year Maturity [Abstract]
Present Value of Future Minimum Lease Payments, Sale Leaseback Transactions, Fiscal Year Maturity [Abstract]
Net Income (Loss)
Net Income (Loss)
Net Income (Loss)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Staff Recommended Return on Common Equity
Staff Recommended Return on Common Equity
The staff's recommended return on common equity.
Affiliated Companies
Accounts Receivable, Related Parties, Current
Disaggregated Revenues from Contracts with Customers
Disaggregation of Revenue [Table Text Block]
Reclassification from AOCI, Net of Income Tax (Expense) Benefit
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax
Purchased Electricity from AEP Affiliates
Cost of Purchased Power from Affiliate
Cost of electricity purchased as well as fuel used to generate electricity used in operations and sold during the reporting period from affiliate.
Liabilities Incurred
Asset Retirement Obligation, Liabilities Incurred
Gross Realized Losses on Investment Sales
Available-for-sale Securities, Gross Realized Losses
Approved Item [Axis]
Approved Item [Axis]
Approved Item [Axis]
Purchased Electricity for Resale [Member]
Electricity, Purchased [Member]
Long-term Debt, Type [Domain]
Long-term Debt, Type [Domain]
Type of Expense [Axis]
Nature of Expense [Axis]
Maximum Interest Rate For Funds Loaned
Maximum Interest Rate For Funds Loaned
The maximum weighted-average interest rate of funds outstanding at that time, calculated on a daily basis, loaned during the period.
Other Financing Activities
Proceeds from (Payments for) Other Financing Activities
Deferred Property Taxes
Deferred Tax Assets, Property, Plant and Equipment
Senior Unsecured Notes
Unsecured Debt
Other Regulatory Assets Not Yet Being Recovered [Member]
Other Regulatory Assets Not Yet Being Recovered [Member]
Other Regulatory Assets Not Yet Being Recovered
Cover [Abstract]
Cover [Abstract]
Refund Item [Domain]
Refund Item [Domain]
[Domain] for Refund Item [Axis]
AEP Transmission Co [Member]
AEP Transmission Co [Member]
AEP Transmission Company, LLC.
2012 Texas Base Rate Case [Member]
2012 Texas Base Rate Case [Member]
2012 Texas Base Rate Case [Member]
Customer Accounts Receivable Managed Portfolio
Customer Accounts Receivable Managed Portfolio [Abstract]
Customer accounts receivable managed portfolio.
Total Long-term Debt Outstanding
Total Long-term Debt Outstanding
Total Long-term Debt Outstanding
Long-term Debt
Minimum Lease Payments, Sale Leaseback Transactions, within Three Years
Minimum Lease Payments, Sale Leaseback Transactions, within Three Years
2024 - 2025 [Member]
Maturity Period 3 [Member]
Service Cost
Defined Benefit Plan, Service Cost
Asset Retirement Obligations
Asset Retirement Obligations, Noncurrent
Accrued Taxes, Net
Increase (Decrease) in Accrued Taxes Payable
Wholesale Transmission [Member]
Wholesale Transmission [Member]
Wholesale Transmission.
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Axis]
Cost of Goods and Services Sold
Purchased Electricity for Resale
Cost of Goods and Services Sold
Requested Fuel Cost Deferral
Requested Fuel Cost Deferral
Requested fuel cost deferral amount in filing.
Equity Components [Axis]
Statement, Equity Components [Axis]
Equity Components [Axis]
Notional Amount of a Discontinued Hedge
Notional Amount of a Discontinued Hedge
Notional Amount of a Discontinued Hedge
Liabilities assumed with Sempra Renewable LLC and Santa Rita East Acquisition
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed
Minimum [Member]
Low [Member]
Minimum [Member]
Balance Sheet Location [Domain]
Balance Sheet Location [Domain]
Requested Return on Equity
Requested Return on Equity
Requested return on equity.
Uncommitted Facility
Uncommitted Facility
Amount of letters of credit drawn on an uncommitted credit facility.
Hedging Contracts [Member]
Hedging Contracts [Member]
Net Income (Loss) Attributable to Noncontrolling Interests
Net Income (Loss) Attributable to Noncontrolling Interests
Net Income (Loss) Attributable to Noncontrolling Interest
Recognition Period [Domain]
Recognition Period [Domain]
[Domain] for Recognition Period [Axis]
Amortization of Net Actuarial Loss
Defined Benefit Plan, Amortization of Gain (Loss)
Liabilities Subject to Cross Default Provisions
Cross Default Provision [Text Block]
Tabular disclosure of liabilities subject to cross default provisions.
Entity Interactive Data Current
Entity Interactive Data Current
Sub-Limit of Secured Debt
Sub-Limit of Secured Debt
The amount of secured debt as a sub-limit to the amount of contractually defined priority debt as defined in the covenants for AEPTCo's note purchase agreements and indenture.
Net Periodic Benefit Cost (Credit)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)
Revenues
Revenues [Abstract]
Operating Activities
Net Cash Provided by (Used in) Operating Activities [Abstract]
Commodity [Member]
Commodity Contract [Member]
Derivative, Volume Notional Amount
Derivative Nonmonetary Volume Notional Amount
Volume of heating oil and gasoline derivative contracts.
Bad Debt Reserves Related to Securitization, Sale of Accounts Receivable
Bad Debt Reserves Related to Securitized Sale of Accounts Receivable
A valuation allowance for securitized receivables that are expected to be uncollectible.
Restricted Stock Units and Performance Share Units [Member]
Restricted Stock Units and Performance Share Units [Member]
Statement of Stockholders' Equity [Abstract]
Statement of Stockholders' Equity [Abstract]
Percent of Excess Earnings Subject to Refund
Percent of Excess Earnings Subject to Refund
The percent of excess earnings that are subject to refund during the Virginia Trienniel Review
Approved Item in Commission Order
Approved Item in Commission Order
An item that is approved in a commission order.
Entity Listings, Exchange [Axis]
Entity Listings, Exchange [Axis]
Preferred Stock 2
Preferred Stock 2 [Member]
Preferred Stock 2
Retirement Plan Type [Domain]
Retirement Plan Type [Domain]
Other Income (Expense):
Other Nonoperating Income (Expense) [Abstract]
Portion Expected to be Reclassified to Net Income During the Next Twelve Months
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months
Consolidation Items [Axis]
Consolidation Items [Axis]
Weighted Average Dilutive Effect of:
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Debt and Equity Securities Within Other Temporary Investments
Debt and Equity Securities Within Other Temporary Investments [Abstract]
Activity for our debt and equity securities within Other Temporary Investments.
Property, Plant and Equipment, Net
Public Utilities, Property, Plant and Equipment, Net
Renewable Generation [Member]
Renewable Generation [Member]
Renewable Generation
Accelerated Depreciation Regulatory Asset
Accelerated Depreciation
The amount of accelerated depreciation as a regulatory asset for plants to be retired.
Securitization Bonds [Member]
Securitization Bonds [Member]
A collateralized debt obligation (backed by pledge, mortgage or other lien on the entity's assets).
Total Accounts Receivable
Accounts Receivable, after Allowance for Credit Loss, Current
Rate Matters
Public Utilities Disclosure [Text Block]
Stock Issued During Period, Shares, Stock Splits
Stock Issued During Period, Shares, Stock Splits
Spent Nuclear Fuel and Decommissioning Trusts
Fair Value
Spent Nuclear Fuel And Decommissioning Trusts
Funds to pay for the disposal of spent nuclear fuel and the decontaminating and decommissioning of nuclear facilities through the collection of revenues from rate payers.
Settlements
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases, Sales, Issues, Settlements
Potential Refund due to Intervenor Calculated Earnings above ROE Range
Intervenor Calculated Earnings above ROE Range
The amount of potential refund that could result based on an intervenor calculated above the allowed return on equity range during a triennial period.
Capital Contribution from Member
Adjustments to Additional Paid in Capital, Other
Materials and Supplies
Other Inventory, Supplies, Gross
Beginning Balance
Ending Balance
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs
Hurricane Laura [Member]
Hurricane Laura [Member]
Hurricane Laura
Commitments, Guarantees and Contingencies (Textuals) [Abstract]
Commitments Guarantees And Contingencies Textuals [Abstract]
Commitments, Guarantees and Contingencies.
Document Transition Report
Document Transition Report
Amount of Increase Related to Annual Depreciation Rates due to Proposed Investments
Amount of Increase Related to Annual Depreciation Rates due to Proposed Investments
Amount of increased annual depreciation rates due to proposed investments requested.
Approved Additional Vegetation Management Expenses
Approved Additional Vegetation Management Expenses
Increase in approved additional vegetation management expenses
Asset Retirement Obligations
Asset Retirement Obligation and Environmental Cost [Policy Text Block]
Restricted Cash
Restricted Cash and Cash Equivalents, Current
Level 2 [Member]
Fair Value, Inputs, Level 2 [Member]
Increase in Rider Rates related to Expanded Net Energy Cost and Vegetation Management
Increase in Rider Rates related to Expanded Net Energy Cost and Vegetation Management
Total increase in rider rates related to Expanded Net Energy Cost and Vegetation Management over twelve months beginning September 2020.
Document Quarterly Report
Document Quarterly Report
Liabilities, Fair Value Disclosure
Liabilities, Fair Value Disclosure [Abstract]
Components of Net Periodic Benefit Cost
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Affiliated Accounts Receivable Contracts with Customers
Affiliated Accounts Receivable Contracts with Customers [Table Text Block]
Tabular disclosure of affiliated accounts receivable contracts with customers.
Plant Retirement Costs - Unrecovered Plant, Louisiana [Member]
Plant Retirement Costs - Unrecovered Plant, Louisiana [Member]
Plant Retirement Costs - Unrecovered Plant, Louisiana.
Nonutility Money Pool Activity
Nonutility Money Pool Activity [Table Text Block]
Tabular disclosure of a Nonutility Money Pool participants' money pool activity including: (1) Maximum Borrowings from Nonutility Money Pool; (2) Maximum Loans to Nonutility Money Pool; (3) Average Borrowings from Nonutility Money Pool; (4) Average Loans to Nonutility Money Pool; (5) Net Loans (Borrowings) to/from Nonutility Money Pool as of the balance sheet date. The Nonutility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain nonutility subsidiaries.
Energy Contracts [Member]
Energy Contracts [Member]
Risk management commodity contracts whose primary underlying risk is tied energy contracts.
Minimum Interest Rate
Minimum Interest Rate
The minimum weighted-average interest rate of funds outstanding at that time, calculated on a daily basis, either borrowed from or loaned to a Money Pool during the period. The Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries.
Oklaunion Purchase Power Agreement - Current
Oklaunion Purchase Power Agreement - Current
AEP Texas has partial ownership in the Oklaunion Plant which is operated by PSO but has leased its entire portion of the output of the plant to a non-utility affiliate. This is the current liability portion of the lease.
Mutual Funds Equity [Member]
Mutual Fund [Member]
Shares Per Equity Unit
Shares Per Equity Unit
Amount of shares issued per equity unit at maturity
Total Basic Earnings Per Share Attributable to AEP Common Shareholders
Earnings Per Share, Basic
Entity File Number
Entity File Number
Regulatory Assets Return Disclosure [Domain]
Regulatory Assets Return Disclosure [Domain]
Regulatory Assets Return Disclosure Domain
2023-2024 [Member]
4-5 Years [Member]
Time period in which fixed performance obligations will be satisfied.
Amount of Increase Related to Vegetation Management
Amount of Increase Related to Vegetation Management
The amount of requested increase related to vegetation management.
Base Rate [Axis]
Base Rate [Axis]
Base Rate Axis.
Jointly Owned Utility Plant [Domain]
Jointly Owned Utility Plant [Domain]
Proceeds from Sale of Receivables to AEP Credit
Proceeds from Sale of Finance Receivables
Future Minimum Lease Payments for Sale and Leaseback
Future Minimum Lease Payments for Sale and Leaseback [Table Text Block]
Future Minimum Lease Payments for sale-and-leaseback.
Write-off of Regulatory Expense
Write-off of Regulatory Expense
Write-off of regulatory expense due to a disallowance.
Property, Plant and Equipment
Property, Plant and Equipment, Gross [Abstract]
Regulated Generating Unit Expected to be Retired by 2020
Disposal Groups, Including Discontinued Operations [Table Text Block]
Common Stock Dividends
Dividends, Common Stock
Minimum Lease Payments, Sale Leaseback Transactions, Next Twelve Months
Minimum Lease Payments, Sale Leaseback Transactions, Next Twelve Months
Balance Sheet Location [Axis]
Balance Sheet Location [Axis]
Reverse Common Stock Split
Reverse Common Stock Split
Reverse Common Stock Split to reduce the number of shares
Revenue from Contracts with Customers
Generation & Marketing Revenues
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Revenue from Contract with Customer, Including Assessed Tax
Additional Recognized Expenses Consisting Primarily of Depreciation and Vegetation Management
Additional Recognized Expenses Consisting Primarily of Depreciation and Vegetation Management
Increase in recognized expenses consisting primarily of depreciation and vegetation management
Virginia Jurisdictional AMI Meters [Member]
Virginia Jurisdictional AMI Meters [Member]
Virginia Jurisdictional AMI Meters
Appalachian Power Co [Member]
Appalachian Power Co [Member]
Appalachian Power Company Member
Commercial Paper [Member]
Commercial Paper [Member]
Capitalized Storm Costs
Capitalized Storm Costs
Total amount of capitalized storm costs.
Short-term Debt:
Short-term Debt [Abstract]
Derivatives and Hedging (Textuals) [Abstract]
Derivatives and Hedging Textuals [Abstract]
Derivatives and Hedging Textuals
Average Interest Rate For Funds Borrowed
Average Interest Rate For Funds Borrowed
The average interest rate for funds borrowed from a Money Pool during the period. The Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries.
Generation and Marketing [Member]
Generation and Marketing Revenues [Member]
Generation and Marketing Revenues [Member]
Generation and Marketing Revenues.
Retirement Benefits [Abstract]
Retirement Benefits [Abstract]
Other Property, Plant and Equipment
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment
Other Operation
Utilities Operating Expense, Operations
Noncontrolling Interests
Stockholders' Equity Attributable to Noncontrolling Interest
Total Short-term Debt
Short-term Debt
Other Long Term Debt [Member]
Other Long Term Debt [Member]
Other long term debt member
Investing Activities
Net Cash Provided by (Used in) Investing Activities [Abstract]
Comparative Accounts Receivable Information
Comparative Accounts Receivable Information [Text block]
Comparative accounts receivable information.
Heating Oil and Gasoline [Member]
Heating Oil And Gasoline Contract Member [Member]
Nominal volume used to calculate payments on a derivative instrument.
Securitization Bonds Four [Member]
Securitization Bonds Four [Member]
Securitization Bonds Four [Member]
Within 1 year
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value
Equity Units [Domain]
Equity Units [Domain]
Equity Units issued as Corporate Units
Securitized Assets
Securitized Regulatory Transition Assets, Noncurrent
Regulatory Assets [Member]
Regulatory Assets [Member]
Regulatory Assets.
Incremental Other Operation and Maintenance Expenses
Utilities Operating Expense, Maintenance and Operations
Oklaunion Power Station Accelerated Depreciation [Member]
Oklaunion Power Station Accelerated Depreciation [Member]
Oklaunion Power Station Accelerated Depreciation [Member]
Max Potential Loss on Master Lease Agreements
Max Potential Loss on Master Lease Agreements
Maximum potential loss on master lease agreements.
Statement of Comprehensive Income [Abstract]
Statement of Comprehensive Income [Abstract]
AEP Texas Cumulative Revenues Subject to Review
AEP Texas Cumulative Revenues Subject to Review
AEP Texas cumulative revenues, subject to review, based upon interim rate increases received.
TOTAL LIABILITIES AND EQUITY
Liabilities and Equity
Accumulated Other Comprehensive Income (Loss)
Beginning Balance in AOCI
Ending Balance in AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax
Income Taxes
Income Tax Disclosure [Text Block]
TOTAL NONCURRENT LIABILITIES
Liabilities, Noncurrent
Portion at Fair Value Measurement [Member]
Portion at Fair Value Measurement [Member]
DCC Fuel [Member]
DCC Fuel [Member]
DCC Fuel Variable Interest Entity Member
Statutory Accounting Practices, Jurisdiction [Domain]
Statutory Accounting Practices, Jurisdiction [Domain]
Rockport Plant, Unit 2 Operating Lease Amortization
Operating Lease, Cost
Hedging Relationship [Axis]
Hedging Relationship [Axis]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Sales of Investment Securities
Proceeds from Sale, Maturity and Collection of Investments
Letters of Credit [Member]
Letters of Credit [Member]
Letters of Credit Member.
Wholesale Generation [Member]
Wholesale Generation [Member]
Wholesale Generation.
Voluntary Retirement Incentive Program [Abstract]
Voluntary Retirement Incentive Program [Abstract]
Voluntary Retirement Incentive Program
Equity Component [Domain]
Equity Component [Domain]
Staff Calculated Revenue Deficiency
Staff Calculated Revenue Deficiency
Amount of revenue deficiency calculated by staff.
Long-term Risk Management Assets
Derivative Asset, Noncurrent
Amount of Increase Related to Storm Catastrophe Reserve
Amount of Increase Related to Storm Catastrophe Reserve
The amount of requested increase related to a storm catastrophe reserve.
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET
Net Investment
Property, Plant and Equipment, Net
Property, Plant and Equipment, Net
Entity Tax Identification Number
Entity Tax Identification Number
Average Loans to Money Pool
Average Loans to Money Pool
Average Loans to a Money Pool during the period. The Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries.
Interest Rate Contract [Member]
Interest Rate Contract [Member]
Asset Retirement Obligation, Period Increase (Decrease)
Asset Retirement Obligation, Period Increase (Decrease)
Changes in Certain Components of Working Capital:
Increase (Decrease) in Operating Capital [Abstract]
Retirements and Principal Payments
Schedule of Extinguishment of Debt [Table Text Block]
Recommended Disallowance
Recommended Disallowance from Staff or Intervenors
Recommended disallowance from either staff or intervenors in current case.
Current Fiscal Year End Date
Current Fiscal Year End Date
Expenses
Operating Expenses [Abstract]
Mutual Funds Fixed Income [Member]
Mutual Funds Fixed Income [Member]
Mutual Funds Fixed Income
Average Interest Rate For Funds Loaned
Average Interest Rate For Funds Loaned
The average interest rate for funds loaned to a Money Pool during the period. The Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries.
Minimum Lease Payments, Sale Leaseback Transactions
Minimum Lease Payments, Sale Leaseback Transactions
Guarantee Obligations Current Carrying Value Other Liabilities Current
GuaranteeObligationsCurrentCarryingValueOtherLiabilitiesCurrent
The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees recorded under Other Current Liabilities.
Utility [Member]
Utility [Member]
Utility Company.
Distribution
Public Utilities, Property, Plant and Equipment, Distribution
Impact of Cash Flow Hedges on the Condensed Balance Sheet
Impact of Cash Flow Hedges on Balance Sheet [Abstract]
Impact of Cash Flow Hedges on Balance Sheet.
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold [Abstract]
Proceeds from Investment Sales
Proceeds from Sale of Short-term Investments
Corporate unit ownership share of an equity unit
Corporate unit ownership share of an equity unit
A corporate unit's undivided beneficial ownership interest in an equity unit
Vegetation Management Program [Member]
Capitalized Vegetation Management Expenses [Member]
Vegetation Management [Member]
Vegetation Management Member.
Trust Assets [Axis]
Trust Assets [Axis]
Trust Assets [Axis]
Supplementary Information
Supplemental Cash Flow Information [Abstract]
Proceeds from Sale of Receivables
Proceeds from Sale and Collection of Receivables [Abstract]
Base Rate [Domain]
Base Rate [Domain]
Base Rate Domain.
Santa Rita East [Member]
Santa Rita East [Member]
Santa Rita East
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Property, Plant and Equipment, Type [Domain]
Long-Lived Tangible Asset [Domain]
Per Unit Conversion for Equity Units
Per Unit Conversion for Equity Units
The PAR value for each equity unit as issued
Amount of Gain (Loss) Recognized on Risk Management Contracts
Derivative Risk Management Contracts Gain Loss Recognized As Regulatory Asset Liability
Realized and unrealized gains and losses subject to regulatory accounting treatment recorded as either current or noncurrent on the balance sheets.
AEP Share Price for Equity Unit Conversion
AEP Share Price for Equity Unit Conversion
AEP Share Price for Equity Unit Conversion
Junior Subordinated Debt [Member]
Junior Subordinated Debt [Member]
Refund Item [Axis]
Refund Item [Axis]
Refund Item [Axis]
Issuance of Common Stock, Shares
Stock Issued During Period, Shares, New Issues
Disaggregation of Revenue [Abstract]
Disaggregation of Revenue [Abstract]
After 5 years through 10 years
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value
Refund for Excess ADIT Associated with Certain Depreciable Property
Refund for Excess ADIT Associated with Certain Depreciable Property
Amount of refund to be given through rate reductions, riders, etc related to Excess ADIT Associated with Certain Depreciable Property.
Acquisition of Nuclear Fuel Included in Current Liabilities as of September 30,
Acquisition Of Nuclear Fuel Included In Current Liabilities
Future cash outflow to pay for acquired nuclear fuel.
Discrete Tax Adjustments
Effective Income Tax Rate Reconciliation Discrete Tax Adjustments Percentage
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations due to Discrete Tax Adjustments.
Plant Retirement Costs - Materials and Supplies [Member]
Materials and Supplies Related to Retired Plants [Member]
Materials and Supplies Related to Retired Plants [Member]
Incremental Long-Term Incentive Plan Grants [Member]
Incremental Long-Term Incentive Plan Grants [Member]
Incremental Long-Term Incentive Plan Grants
COVID-19 - Virginia
COVID-19 - Virginia [Member]
COVID-19 - Virginia
Accumulated Depreciation and Amortization
Accumulated Depreciation
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings
Maximum Potential Loss [Abstract]
Maximum Potential Loss [Abstract]
Maximum potential loss.
Hedging Relationship [Domain]
Hedging Relationship [Domain]
Intervenor Calculated Earned Return during Triennial Period
Intervenor Calculated Earned Return during Triennial Period
The percentage that an intervenor calculates as a companies earned return during a triennial period.
Intervenor Calculated Revenue Surplus
Intervenor Calculated Revenue Surplus
Intervenor calculated revenue surplus for its filed rate year based upon the intervenor’s recommended ROE.
Maximum Interest Rate for Funds Borrowed
Maximum Interest Rate for Funds Borrowed
The maximum weighted-average interest rate of funds outstanding at that time, calculated on a daily basis, borrowed during the period.
Domestic [Member]
Domestic [Member]
Domestic Member.
Weighted Average Number of Basic AEP Common Shares Outstanding
Weighted Average Number of Basic AEP Common Shares Outstanding
Weighted Average Number of Shares Outstanding, Basic
Construction Expenditures Included in Current Liabilities as of September 30,
Construction in Progress Expenditures Incurred but Not yet Paid
Cash and Cash Equivalents [Member]
Cash and Cash Equivalents [Member]
Jurisdiction [Axis]
Jurisdiction [Axis]
Pollution Control Bond Two [Member]
Pollution Control Bond Two [Member]
Pollution Control Bond Two
Revenue from Contract with Customer
Revenue from Contract with Customer [Text Block]
Significant Unobservable Inputs for Level 3
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block]
Other Current Liabilities
Increase (Decrease) in Other Current Liabilities
Securities Activity Within the Decommissioning and SNF Trusts
Securities Activity Within Decommissioning and SNF Trusts [Text Block]
Securities Activity Within the decommissioning and SNF trusts.
Amortization of Actuarial (Gains) Losses
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax
Long Term Debt, Fair Value
Long-term Debt, Fair Value
Income Tax Expense (Benefit)
Income Tax (Expense) Benefit
Income Tax Expense (Benefit)
Turk Generating Plant [Member]
Turk Generating Plant [Member]
Turk Generating Plant Member
Cash, Cash Equivalents and Restricted Cash at Beginning of Period
Cash, Cash Equivalents and Restricted Cash at End of Period
Total Cash, Cash Equivalents and Restricted Cash
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Local Phone Number
Local Phone Number
Payments to Acquire Businesses, Gross
Payments to Acquire Businesses, Gross
Rate Case Expense [Member]
Rate Case Expense [Member]
Rate Case Expense.
Reclassification from AOCI, before Income Tax (Expense) Benefit
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Requested Net Annual Increase
Requested Net Annual Increase
The amount requested for net annual increase.
2021 - 2023 [Member]
Maturity Period 2 [Member]
Fair Value of Derivative Instruments
Derivative Instrument Detail [Abstract]
Dolet Hills Lignite Company and Oxbow Lignite Billings
Dolet Hills Lignite Company and Oxbow Lignite Billings
Dolet Hills Lignite Company and Oxbow billings to SWEPCo for lignite deliveries which primarily includes accelerated depreciation and amortization of fixed costs.
Type of Expense [Domain]
Interim Period, Costs Not Allocable [Domain]
2019 Equity Units [Member]
2019 Equity Units [Member]
2019 Equity Units issued in March 2019
Cash Flow Hedges [Member]
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Indiana Michigan Power Co [Member]
Indiana Michigan Power Co [Member]
Indiana Michigan Power Company Member
ARO Type [Domain]
ARO Type [Domain]
ARO Type
2017-2019 Virginia Triennial Review [Member]
Virginia Legislation Affecting Biennial Reviews [Member]
Virginia Legislation Affecting Biennial Reviews [Member]
Equity Units [Member]
Equity units [Member]
Equity units issued by AEP in March 2019
Letters of Credit Limit
Line of Credit Facility, Maximum Borrowing Capacity
Amount Of Increased Depreciation Expense Requested
Amount Of Increased Depreciation Expense Requested
Amount of increased depreciation expense requested.
Commercial Paper
Commercial Paper
Refund for Over Collections
Refund for Over Collections
Refund to customers for over collections based on annual increase being overstated.
2013 Reversal Of Previously Recorded Regulatory Disallowances
2013ReversalOfPreviouslyRecordedRegulatoryDisallowances
The 2013 reversal of previously recorded regulatory disallowances.
Kentucky Deferred Purchase Power Expenses [Member]
Kentucky Deferred Purchase Power Expenses [Member]
Kentucky Deferred Purchase Power Expenses [Member]
Reportable Segment Information
Segment Reporting Information, Profit (Loss) [Abstract]
Electric Generation, Transmission and Distribution Revenues [Member]
Electric Generation Transmission Distribution Revenues [Member]
Electric Generation, Transmission and Distribution Revenues.
Retained Earnings [Member]
Retained Earnings [Member]
Measurement Basis [Axis]
Measurement Basis [Axis]
Major Property Class [Domain]
Major Property Class [Domain]
Asset Retirement Obligation, Revision of Estimate
Asset Retirement Obligation, Revision of Estimate
Short-term Debt, Type [Domain]
Short-term Debt, Type [Domain]
Components of Net Periodic Benefit Cost
Schedule of Net Benefit Costs [Table Text Block]
Significant Accounting Matters
Significant Accounting Policies [Text Block]
Net Cash Flows from (Used for) Investing Activities
Net Cash Provided by (Used in) Investing Activities
Purchases of Investment Securities
Payments to Acquire Investments
Nuclear Trust Fund Investments
Nuclear Trust Fund Investments [Abstract]
Nuclear trust fund investments.
Maximum Loans to Money Pool
Maximum Loans to Money Pool
Maximum Loans to a Money Pool at anytime during the period. The Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries.
Guarantor Obligations, Current Carrying Value
Guarantor Obligations, Current Carrying Value
Other Temporary Investments
Other Temporary Investments [Text Block]
Other Temporary Investments
Noncurrent Liabilities
Liabilities, Noncurrent [Abstract]
Recognition Period [Axis]
Recognition Period [Axis]
Recognition Period [Axis]
Long-term Debt
Long-term Debt, Unclassified [Abstract]
Corporate Debt [Member]
Corporate Debt Securities [Member]
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations and Disposal Groups [Abstract]
Property, Plant and Equipment
Property, Plant and Equipment Disclosure [Text Block]
Commitments, Guarantees and Contingencies
Commitments Contingencies and Guarantees [Text Block]
Allowance for Equity Funds Used During Construction
Allowance for Equity Funds Used During Construction
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity
Fair Value Measurements (Textuals)
Fair Value Measurements (Textuals) [Abstract]
Fair Value Measurements Textuals Abstract
Impairment Charge Disallowed Plant Investments
Impairment Charge Disallowed Plant Investments
Impairment Charge recorded to recognize disallowed plant investments.
Amount of Prepaid Pension and OPEB Assets that Intervenor's Recommend a Company Not Earn a Return On
Amount of Prepaid Pension and OPEB Assets that Intervenor's Recommend a Company Not Earn a Return On
The total amount of prepaid pension and OPEB assets that intervenor's recommend a company not earn a return on.
Dolet Hills Power Station [Member]
Dolet Hills Generating Station (Unit No. 1) [Member]
Dolet Hills Generating Station (Unit No. 1) Member
Pension Plans [Member]
Pension Plan [Member]
Earnings Per Share
Earnings Per Share [Text Block]
Customer Accounts Receivable Managed Portfolio
Customer Accounts Receivable Managed Portfolio [Text Block]
Customer accounts receivable managed portfolio.
Redeemable Noncontrolling Interest
Redeemable Noncontrolling Interest, Equity, Carrying Amount
Current Liabilities
Liabilities, Current [Abstract]
U.S. Federal Statutory Rate
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Gross Amounts Offset in the Statement of Financial Position [Member]
Gross Amounts Offset in Statement of Financial Position [Member]
Gross Amounts Offset in the Statement of Financial Position.
Accretion Expense
Asset Retirement Obligation, Accretion Expense
Gain (Loss) on Hedging Instruments
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Vertically Integrated Utilities Revenues [Member]
Vertically Integrated Utilities Revenues [Member]
Vertically Integrated Utilities Revenues.
Statement of Financial Position [Abstract]
Statement of Financial Position [Abstract]
Fuel and Other Consumables Used for Electric Generation [Member]
Electricity, Generation [Member]
Maximum Percentage of Consolidated Tangible Net Assets
Maximum Percentage of Consolidated Tangible Net Assets
Maximum percentage of consolidated tangible net assets limit for debt as stated in the covenants in AEPTCO's note purchase agreements and indenture.
Other Temporary Investments
Short-term Investments