Comprehensive Income [Abstract]
Statement [Table]
Statement [Table]
Legal Entity [Axis]
Legal Entity [Axis]
Entity [Domain]
Entity [Domain]
Statement [Line Items]
Statement [Line Items]
Comprehensive Income
Comprehensive Income (Loss) Note [Text Block]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging
Derivatives, Policy [Policy Text Block]
Revenue from Contract with Customer [Abstract]
Disaggregated Revenues from Contracts with Customers
Disaggregation of Revenue [Table Text Block]
Fixed Performance Obligations
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]
Affiliated Accounts Receivable Contracts with Customers [Table Text Block]
Affiliated Accounts Receivable Contracts with Customers [Table Text Block]
Tabular disclosure of affiliated accounts receivable contracts with customers.
Income Tax Disclosure [Abstract]
Status of Tax Reform Regulatory Proceedings
Status of Tax Reform Regulatory Proceedings [Table Text Block]
Tabular disclosure of the current status of Tax Reform regulatory proceedings in AEP's various regulatory jurisdictions.
Schedule of Effective Income Tax Rate Reconciliation
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Statement of Comprehensive Income [Abstract]
Equity Components [Axis]
Equity Components [Axis]
Equity Component [Domain]
Equity Component [Domain]
Noncontrolling Interest [Member]
Noncontrolling Interest [Member]
AEP Texas Inc. [Member]
AEP Texas Inc. [Member]
AEP Texas Inc.
Appalachian Power Co [Member]
Appalachian Power Co [Member]
Appalachian Power Company Member
Indiana Michigan Power Co [Member]
Indiana Michigan Power Co [Member]
Indiana Michigan Power Company Member
Ohio Power Co [Member]
Ohio Power Co [Member]
Ohio Power Company Member
Public Service Co Of Oklahoma [Member]
Public Service Co Of Oklahoma [Member]
Public Service Company Of Oklahoma Member
Southwestern Electric Power Co [Member]
Southwestern Electric Power Co [Member]
Southwestern Electric Power Company Member
Net Income (Loss)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
OTHER COMPREHENSIVE INCOME
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Cash Flow Hedges, Net of Tax
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax
Amortization of Pension and OPEB Deferred Costs, Net of Tax
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)
Other Comprehensive Income (Loss), Net of Tax
TOTAL COMPREHENSIVE INCOME (LOSS)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Total Comprehensive Income Attributable to Noncontrolling Interest
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO COMMON SHAREHOLDERS
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Retirement Benefits [Abstract]
Benefit Plans
Pension and Other Postretirement Benefits Disclosure [Text Block]
Notional Volume of Derivative Instruments
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]
Fair Value of Derivative Instruments
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Schedule of Derivative Instruments Included in Trading Activities [Table Text Block]
Impact of Fair Value Hedges on Balance Sheet [Table Text Block]
Impact of Fair Value Hedges on Balance Sheet [Table Text Block]
Impact of Fair Value Hedges on Condensed Balance Sheet [Table Text Block]
Derivative Instruments, Gain (Loss)
Derivative Instruments, Gain (Loss) [Table Text Block]
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.
Liabilities Subject to Cross Default Provisions
Cross Default Provision [Text Block]
Tabular disclosure of liabilities subject to cross default provisions.
Fair Value Disclosures [Abstract]
Financial Instrument [Axis]
Financial Instrument [Axis]
Financial Instruments [Domain]
Financial Instruments [Domain]
Cash [Member]
Cash [Member]
Fixed Income Funds [Member]
Fixed Income Funds [Member]
Mutual Funds Fixed Income [Member]
Mutual Funds Fixed Income [Member]
Mutual Funds Fixed Income
Mutual Funds Equity [Member]
Mutual Funds Equity [Member]
Mutual Funds Equity
Cash and Cash Equivalents [Member]
Cash and Cash Equivalents [Member]
US Government Agencies Debt Securities [Member]
US Government Agencies Debt Securities [Member]
Corporate Debt [Member]
Corporate Debt Securities [Member]
State and Local Jurisdiction [Member]
State and Local Jurisdiction [Member]
Domestic [Member]
Domestic [Member]
Domestic Member.
Hedging Relationship [Axis]
Hedging Relationship [Axis]
Hedging Relationship [Domain]
Hedging Relationship [Domain]
Risk Management Commodity Contracts [Member]
Risk Management Commodity Contracts [Member]
Risk Management Contracts Member.
Energy Contracts [Member]
Energy Contracts [Member]
Risk management commodity contracts whose primary underlying risk is tied energy contracts.
Natural Gas Contract [Member]
Natural Gas Contract [Member]
Nominal energy measure used to calculate payments on a derivative instrument.
FTRs [Member]
Financial Trasnsmission Rights [Member]
Risk management commodity contracts whose primary underlying risk is tied financial transmission rights.
Commodity Hedges [Member]
Commodity [Member]
Fair Value Hedges [Member]
Fair Value Hedging [Member]
Maturity Of Fair Value Risk Management Contracts [Axis]
Maturity Of Fair Value Risk Management Contracts [Axis]
Maturity Year [Domain]
Maturity Year [Domain]
2019 [Member]
Within Current Year [Member]
Maturity of risk management contracts within current year.
2020 - 2022 [Member]
Maturity Period 2 [Member]
2023 - 2024 [Member]
Maturity Period 3 [Member]
2025-2032 [Member]
Maturity Period Four [Member]
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Domain]
Fair Value Hierarchy and NAV [Domain]
Level 1 [Member]
Fair Value, Inputs, Level 1 [Member]
Level 2 [Member]
Fair Value, Inputs, Level 2 [Member]
Level 3 [Member]
Fair Value, Inputs, Level 3 [Member]
Measurement Basis [Axis]
Measurement Basis [Axis]
Fair Value Measurement [Domain]
Fair Value Measurement [Domain]
Portion at Fair Value Measurement [Member]
Portion at Fair Value Measurement [Member]
Other [Member]
Portion at Other than Fair Value Measurement [Member]
Range [Axis]
Range [Axis]
Range [Domain]
Range [Domain]
Low [Member]
Minimum [Member]
High [Member]
Maximum [Member]
Weighted Average [Member]
Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Assets, Fair Value Disclosure
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents
Cash and Cash Equivalents, Fair Value Disclosure
Other Temporary Investments
Other Short-term Investments
Risk Management Assets
Derivative Asset [Abstract]
Risk Management Assets
Derivative Asset
Spent Nuclear Fuel and Decommissioning Trusts
Nuclear Fuel and Decommissioning Trusts [Abstract]
Nuclear Fuel and Decommissioning Trusts Abstract.
Spent Nuclear Fuel and Decommissioning Trusts
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.
Total Assets
Assets, Fair Value Disclosure
Liabilities, Fair Value Disclosure
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities
Derivative Liability
Changes in the Fair Value of Net Trading Derivatives and Other Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings
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) Measured on Recurring Basis, Change in Unrealized Gain (Loss)
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included in Other Comprehensive Income (Loss)
Settlements
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases, Sales, Issues, Settlements
Transfers into Level 3
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3
Transfers out of Level 3
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3
Changes in Fair Value Allocated to Regulated Jurisdictions
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.
Ending Balance
Level 3 Quantitative Information
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
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.
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.
Maturity of Net Fair Value of Risk Management Contracts
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.
equity units [Axis]
equity units [Axis]
AEP's equity units issued in March 2019. Tied to AEP's Junior Subordinated Notes [Axis]
equity units [Domain]
equity units [Domain]
[Domain] for AEP's equity units issued in March 2019. Tied to AEP's Junior Subordinated Notes [Axis]
Fair Value, Inputs, Level 1 [Member]
AEP Transmission Co [Member]
AEP Transmission Co [Member]
AEP Transmission Company, LLC.
Trust Assets [Axis]
Trust Assets [Axis]
Trust Assets [Axis]
Trust Assets [Domain]
Trust Assets [Domain]
[Domain] for Trust Assets [Axis]
Spent Nuclear Fuel and Decommissioning Trusts [Member]
Spent Nuclear Fuel and Decommissioning Trusts [Member]
Spent Nuclear Fuel and Decommissioning Trusts.
Book Values and Fair Values of Long - term Debt
Long-term Debt, Other Disclosures [Abstract]
Total Long-term Debt Outstanding
Long-term Debt
Long Term Debt, Fair Value
Long-term Debt, Fair Value
Other Temporary Investments
Short-term Investments [Abstract]
Cost
Investment Owned, at Cost
Gross Unrealized Gains
Investment Owned, Unrecognized Unrealized Appreciation
Gross Unrealized Losses
Investment Owned, Unrecognized Unrealized Depreciation
Fair Value
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.
Proceeds from Investment Sales
Proceeds from Sale of Short-term Investments
Purchases of Investments
Payments to Acquire Short-term Investments
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.
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.
Nuclear Trust Fund Investments
Nuclear Trust Fund Investments [Abstract]
Nuclear trust fund investments.
Fair Value
Gross Unrealized Gains
Available-for-sale Securities, Gross Unrealized Gain
Other-Than-Temporary Impairments
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities
Unrealized Gain on Securities
Unrealized Gain on Securities
Unrealized Loss on Securities
Unrealized Loss on Securities
Securities Activity Within Decommissioning and SNF Trusts
Securities Activity Within Decommissioning and SNF Trusts [Abstract]
Securities Activity Within Decommissioning And Snf Trusts.
Proceeds from Investment Sales
Proceeds from Sale of Available-for-sale Securities
Purchases of Investments
Payments to Acquire Available-for-sale Securities
Gross Realized Gains on Investment Sales
Available-for-sale Securities, Gross Realized Gains
Gross Realized Losses on Investment Sales
Available-for-sale Securities, Gross Realized Losses
Contractual Maturities, Fair Value of Debt Securities
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Within 1 year
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value
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
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
After 10 years
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value
Fair Value Measurements (Textuals)
Fair Value Measurements (Textuals) [Abstract]
Fair Value Measurements Textuals Abstract
Adjusted Cost of Debt Securities
Adjusted cost of debt securities
Adjusted cost of debt securities.
Adjusted Cost of Domestic Equity Securities
Adjusted Cost Of Equity Securities
Adjusted cost of equity securities within the nuclear trusts
Accounting Policies [Abstract]
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).
Earnings Per Share
Earnings Per Share, Policy [Policy Text Block]
Regulated Operations [Abstract]
Public Utilities General Disclosures [Table]
Public Utilities General Disclosures [Table]
Subsequent Event Type [Axis]
Subsequent Event Type [Axis]
Subsequent Event Type [Domain]
Subsequent Event Type [Domain]
Subsequent Event [Member]
Subsequent Event [Member]
Minimum [Member]
Maximum [Member]
Base Rate [Axis]
Base Rate [Axis]
Base Rate Axis.
Base Rate [Domain]
Base Rate [Domain]
Base Rate Domain.
AEP Texas Interim Transmission and Distribution Rates [Member]
AEP Texas Interim Transmission and Distribution Rates [Member]
AEP Texas Interim Transmission and Distribution Rates [Member]
Texas Storm Cost Securitization [Member]
Texas Storm Cost Securitization [Member]
Texas Storm Cost Securitization [Member]
ETT Interim Transmission Rates [Member]
ETT Interim Transmission Rates [Member]
ETT Interim Transmission Rates [Member]
2018 Oklahoma Base Rate Case [Member]
2018 Oklahoma Base Rate Case [Member]
2018 Oklahoma Base Rate Case [Member]
2012 Texas Base Rate Case [Member]
2012 Texas Base Rate Case [Member]
2012 Texas Base Rate Case [Member]
2016 Texas Base Rate Case [Member]
2016 Texas Base Rate Case [Member]
2016 Texas Base Rate Case [Member]
Louisiana 2018 Formula Rate Filing [Member]
Louisiana 2018 Formula Rate Filing [Member]
Louisiana 2018 Formula Rate Filing [Member]
Welsh Plant, Units 1 and 3 - Environmental Projects [Member]
Welsh Plant Units 1 And 3 Environmental Projects [Member]
Welsh Plant Units 1 And 3 Environmental Projects [Member]
2019 Arkansas Base Rate Case [Member]
2019 Arkansas Base Rate Case [Member]
2019 Arkansas Base Rate Case [Member]
FERC Transmission Complaint - AEP SPP Participants [Member]
FERC Transmission Complaint - AEP SPP Participants [Member]
FERC Transmission Complaint - AEP SPP Participants
Public Utility [Axis]
Public Utility [Axis]
Utility Plant [Domain]
Utility Plant [Domain]
Turk Generating Plant [Member]
Turk Generating Plant [Member]
Turk Generating Plant Member
Welsh Plant, Units 1 and 3 [Member]
Welsh Plant Unit 1 and 3 [Member]
Welsh Plant Unit 1 and 3 [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, General Disclosures [Line Items]
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 from 2009 through 2016.
Annual Recovery of Storm Costs through Base Rates
Annual Recovery of Storm Costs through Base Rates
AEP Texas' current recovery of annual storm costs through base rates.
AEP Texas Total Storm-Related Costs
AEP Texas Total Storm-Related Costs
AEP Texas' total deferred storm-related costs
AEP Texas Hurricane Harvey Storm-Related Costs
AEP Texas Hurricane Harvey Storm-Related Costs
AEP Texas' deferred storm costs as a regulatory asset related to Hurricane Harvey.
Distribution-Related System Restoration Costs
Distribution-Related System Restoration Costs
Amount of estimated Distribution-Related System Restoration Costs requested in securitization filing.
Estimated Carrying Costs
Estimated Carrying Costs
Amount of estimated Carrying Costs requested in securitization filing.
Up-front Qualified Costs
Up-front Qualified Costs
Amount of Up-front Qualified Costs requested in securitizaiton filing.
Total Distribution-Related System Restoration Costs
Total Distribution-Related System Restoration Costs
Total amount of estimated Distribution-Related System Restoration Costs requested in securitization filing including estimated carrying costs and up-front qualified costs.
Insurance Proceeds and Government Grants
Insurance Proceeds and Government Grants
Amount of insurance proceeds and government grants received for storm costs.
Excess ADIT
Excess ADIT
Amount of Excess ADIT used to offset total estimated distribution-related system restoration costs requested in securitization filing.
Securitization Request for Distribution Related Assets
Securitization Request for Distribution Related Assets
Total amount of estimated Distribution-Related System Restoration Costs requested in securitization filing including estimated carrying costs and up-front qualified costs, net of offsetting insurance proceeds, government grants and Excess ADIT.
Transmission Related Assets to be Recovered at a Later Time
Transmission Related Assets to be Recovered at a Later Time
Total amount of Transmission Related Assets to be recovered at a later time.
Parent Ownership Interest In ETT
Parent Ownership Interest In ETT
Parents equity ownership interest in ETT.
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 received from 2009 through 2015.
Requested Annual Increase
Requested Annual Increase
Requested annual increase.
Requested Return on Equity
Requested Return on Equity
Requested return on equity.
Amount Of Increased Depreciation Expense Requested
Amount Of Increased Depreciation Expense Requested
Amount of increased depreciation expense requested.
Amount of Increase Related to Increased Storm Expense Amortization
Amount of Increase Related to Increased Storm Expense Amortization
Amount of requested increase related to the increase in storm expense amortization.
Approved Annual Revenue Increase
Approved Annual Revenue Increase
Amount of approved annual revenue increase.
Approved Return on Common Equity
Approved Return on Common Equity
Percentage of public utility's requested return on equity.
Revenue Cap on New Distribution Reliability and Safety Rider
Revenue Cap on New Distribution Reliability and Safety Rider
Amount of the revenue cap on the new distribution reliability and safety rider.
2013 Reversal of Previously Recorded Regulatory Disallowances
2013ReversalOfPreviouslyRecordedRegulatoryDisallowances
The 2013 reversal of previously recorded regulatory disallowances.
Resulting Approved Base Rate Increase
Resulting Approved Base Rate Increase
The resulting annual base rate increase subsequent to recent rulings.
Property, Plant and Equipment, Net
Public Utilities, Property, Plant and Equipment, Net
Texas Jurisdictional Share of Turk Plant
Texas Jurisdictional Share of Turk Plant
Texas jurisdictional share of the Turk Plant
Requested Net Increase in Texas Annual Revenues
Requested Net Increase in Texas Annual Revenues
Requested net increase in Texas annual revenues.
Approved Net Increase in Texas Annual Revenues
Approved Net Increase in Texas Annual Revenues
Net Increase in approved Texas Annual Revenues
Approved Additional Vegetation Management Expenses
Approved Additional Vegetation Management Expenses
Increase in approved additional vegetation management expenses
Impairment Charge Total
Impairment Charge Total
Total impairment charge recorded as part of agreement.
Impairment Charge Welsh Plant, Unit 2
Impairment Charge Welsh Plant, Unit 2
Impairment recorded due to lack of return on Welsh Plant Unit 2.
Impairment Charge Disallowed Plant Investments
Impairment Charge Disallowed Plant Investments
Impairment Charge recorded to recognize disallowed plant investments.
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
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
Adjusted Requested Annual Increase
Adjusted Requested Annual Increase
Adjusted annual increase request due to Excess ADIT to be returned to customers.
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.
Projected Capital Costs
Projected Capital Costs
Projected capital costs of property, plant and equipment.
Construction Work in Progress
Construction in Progress, Gross
Total Amount of Recovery Requested Related to Arkansas Retail Jurisdictional Share of Environmental Costs
Total Amount of Recovery Requested Related to Arkansas Retail Jurisdictional Share of Environmental Costs
Total amount of recovery requested related to Arkansas retail jurisdiction share of environmental costs incurred.
Total Amount Of Recovery Requested Related To Louisiana Retail Jurisdictional Share Of Environmental Costs
Total Amount Of Recovery Requested Related To Louisiana Retail Jurisdictional Share Of Environmental Costs
Total amount of recovery requested related to the Louisiana jurisdictional share of environmental costs.
Amount of LPSC Approved Eligible Welsh Plant Environmental Control Deferrals
Amount of LPSC Approved Eligible Welsh Plant Environmental Control Deferrals
Amount of LPSC approved eligible Welsh Plant environmental control deferrals.
Amount of LPSC Approved Eligible Welsh Plant Environmental Control Deferred Unrecognized Equity
Amount of LPSC Approved Eligible Welsh Plant Environmental Control Deferred Unrecognized Equity
Amount of LPSC approved eligible Welsh Plant environmental control deferred unrecognized equity.
Requested Annual Net Increase
Requested Annual Net Increase
Requested annual net increase in rates
Requested Additional Vegetation Management Expenses
Requested Additional Vegetation Management Expenses
Amount of additional vegetation management expenses requested
Intervenor Recommended Return On Common Equity Range
Intervenor Recommended Return On Common Equity Range
Intervenor recommended return on common equity.
Second Intervenor Recommended Return on Common Equity
Second Intervenor Recommended Return on Common Equity
Recommended return on common equity filed by second set of intervenors
Return On Common Equity Per Settlement Agreement
Return On Common Equity Per Settlement Agreement
Return on common equity per the settlement agreement.
Return on Common Equity Inclusive of RTO Per Settlement Agreement
Return on Common Equity Inclusive of RTO Per Settlement Agreement
Settlement agreement filed with the FERC on return on common equity inclusive of RTO
RTO Incentive Adder Per Settlement Agreement
RTO Incentive Adder Per Settlement Agreement
Percent amount of RTO incentive adder included in settlement agreement filed with the FERC.
Statement of Stockholders' Equity [Abstract]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Equity Components [Axis]
Common Stock [Member]
Common Stock [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
AOCI Attributable to Parent [Member]
Noncontrolling Interests [Member]
Common Stock, Dividends, Per Share, Declared
Common Stock, Dividends, Per Share, Declared
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance, Shares
Common Stock, Shares, Issued
Beginning Balance
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest
Members' Equity
Members' Equity
Issuance of Common Stock, Value
Stock Issued During Period, Value, New Issues
Issuance of Common Stock, Shares
Stock Issued During Period, Shares, New Issues
Common Stock Dividends
Dividends, Common Stock
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.
Common Stock Dividends
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders
Other Changes in Equity
Stockholders' Equity, Other
Capital Contributions from Parent
Proceeds from Contributions from Parent
ASU 2018-02 Adoption
Stockholders Equity ASU 2018-02 Adoption
This element represents movements included in the statement of changes in stockholders' equity which are specifically related to the adoption of ASU 2018-02.
ASU 2016-01 Adoption
Stockholders Equity ASU 2016-01 Adoption
This element represents movements included in the statement of changes in stockholders' equity which are specifically related to the adoption of ASU 2016-01.
Net Income (Loss)
Net Income (Loss) Available to Common Stockholders, Basic
Net Income Attributable to Noncontrolling Interests
Net Income (Loss) Attributable to Noncontrolling Interest
Other Comprehensive Income (Loss)
Ending Balance
Members' Equity
Ending Balance, Shares
Public Utilities, General Disclosures [Abstract]
Rate Matters
Public Utilities Disclosure [Text Block]
Significant Accounting Matters
Significant Accounting Policies [Text Block]
Book Values and Fair Values of Long-term Debt
Fair Value, by Balance Sheet Grouping [Table Text Block]
Other Temporary Investments
Other Temporary Investments [Text Block]
Other Temporary Investments
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.
Nuclear Trust Fund Investments
Nuclear Trust Fund Investments [Text Block]
Nuclear trust fund investments.
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.
Contractual Maturities, Fair Value of Debt Securities
Investments Classified by Contractual Maturity Date [Table Text Block]
Fair Value, Assets and Liabilities Measured on Recurring Basis
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Changes in Fair Value of Net Trading Derivatives Classified as Level 3
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Significant Unobservable Inputs for Level 3
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block]
Sensitivity of Fair Value Measurements
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
Components of Net Periodic Benefit Cost
Schedule of Net Benefit Costs [Table Text Block]
Basic and Diluted EPS Calculations
Earnings Per Share [Text Block]
Reconciliation of Cash, Cash Equivalents and Restricted Cash
Reconciliation of Cash, Cash Equivalents and Restricted Cash [Table Text Block]
Reconciliation of Cash, Cash Equivalents and Restricted Cash [Table Text Block]
Revision to Prior Year Income
Restatement to Prior Year Income [Table Text Block]
Schedule of Error Corrections and Prior Period Adjustments
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]
Statement of Financial Position [Abstract]
Document Period End Date
Document Period End Date
Current Assets
Assets, Current [Abstract]
Cash and Cash Equivalents
Cash and Cash Equivalents, at Carrying Value
Restricted Cash
Restricted Cash and Cash Equivalents, Current
Other Temporary Investments
Short-term Investments
Advances to Affiliates
Due from Related Parties, Current
Accounts Receivable:
Accounts Receivable, Net, Current [Abstract]
Customers
Accounts Receivable, Gross, Current
Affiliated Companies
Accounts Receivable, Related Parties, Current
Accrued Unbilled Revenues
Unbilled Receivables, Current
Pledged Accounts Receivable - AEP Credit
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount
Miscellaneous
Other Receivables
Allowance for Uncollectible Accounts
Allowance for Doubtful Accounts Receivable, Current
Total Accounts Receivable
Accounts Receivable, Net, Current
Fuel
Inventory, Raw Materials, Gross
Materials and Supplies
Other Inventory, Supplies, Gross
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.
Risk Management Assets
Derivative Asset, Current
Accrued Tax Benefits
Income Taxes Receivable, Current
Regulatory Asset for Under-Recovered Fuel Costs
Regulatory Assets, Current
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.
Margin Deposits
Margin Deposit Assets
Prepayments and Other Current Assets
Prepaid Expense and Other Assets, Current
TOTAL CURRENT ASSETS
Assets, Current
Property, Plant and Equipment
Property, Plant and Equipment, Gross [Abstract]
Generation
Public Utilities, Property, Plant and Equipment, Generation or Processing
Transmission
Public Utilities, Property, Plant and Equipment, Transmission
Distribution
Public Utilities, Property, Plant and Equipment, Distribution
Other Property, Plant and Equipment
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment
Total Property, Plant and Equipment
Property, Plant and Equipment, Gross
Accumulated Depreciation and Amortization
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET
Property, Plant and Equipment, Net
Other Noncurrent Assets
Assets, Noncurrent [Abstract]
Regulatory Assets
Regulatory Assets, Noncurrent
Deferred Tax Assets, Property, Plant and Equipment
Deferred Tax Assets, Property, Plant and Equipment
Securitized Assets
Securitized Regulatory Transition Assets, Noncurrent
Goodwill
Goodwill
Long-term Risk Management Assets
Derivative Asset, Noncurrent
Operating Lease Assets
Operating Lease, Right-of-Use Asset
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.
Deferred Charges and Other Noncurrent Assets
Other Assets, Noncurrent
TOTAL OTHER NONCURRENT ASSETS
Assets, Noncurrent
TOTAL ASSETS
Assets
Current Liabilities
Liabilities, Current [Abstract]
Advances from Affiliates
Due to Related Parties, Current
Accounts Payable
Accounts Payable, Current
Affiliated Companies
Accounts Payable, Related Parties, Current
Short-term Debt:
Short-term Debt [Abstract]
Securitized Debt for Receivables - AEP Credit
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount
Other Short-term Debt
Short-term Bank Loans and Notes Payable
Total Short-term Debt
Short-term Debt
Long-term Debt Due Within One Year
Long-term Debt, Current Maturities
Risk Management Liabilities
Derivative Liability, Current
Customer Deposits
Customer Deposits, Current
Accrued Taxes
Taxes Payable, Current
Accrued Interest
Interest Payable, Current
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.
Obligations Under Finance Leases
Capital Lease Obligations, Current
Obligations Under Operating Leases
Operating Lease, Liability, Current
Regulatory Liability for Over-Recovered Fuel Costs
Regulatory Liability, Current
Other Current Liabilities
Other Liabilities, Current
TOTAL CURRENT LIABILITIES
Liabilities, Current
Noncurrent Liabilities
Liabilities, Noncurrent [Abstract]
Long-term Debt
Long-term Debt, Excluding Current Maturities
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.
Long-term Risk Management Liabilities
Derivative Liability, Noncurrent
Deferred Income Taxes
Deferred Tax Liabilities, Net, Noncurrent
Regulatory Liabilities and Deferred Investment Tax Credits
Regulatory Liability, Noncurrent
Asset Retirement Obligations
Asset Retirement Obligations, Noncurrent
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.
Oklaunion Purchase Power Agreement
Oklaunion Purchase Power Agreement
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 noncurrent liability portion of the lease.
Obligations Under Finance Leases
Capital Lease Obligations, Noncurrent
Obligations Under Operating Leases
Operating Lease, Liability, Noncurrent
Deferred Credits and Other Noncurrent Liabilities
Other Liabilities, Noncurrent
TOTAL NONCURRENT LIABILITIES
Liabilities, Noncurrent
TOTAL LIABILITIES
Liabilities
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.
Commitments and Contingencies
Commitments and Contingencies
Redeemable Noncontrolling Interest
Redeemable Noncontrolling Interest, Equity, Carrying Amount
Contingently Redeemable Performance Share Awards
Contingently Redeemable Performance Share Awards
The fair value as of the balance sheet date of contingently redeemable performance share awards.
Total Mezzanine Equity
Total Mezzanine Equity
Total mezzanine equity balance.
Equity
Stockholders' Equity Attributable to Parent [Abstract]
Common Stock
Common Stock, Value, Issued
Members' Capital
Members' Capital
Paid-in Capital
Additional Paid in Capital
Retained Earnings
Retained Earnings (Accumulated Deficit)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax
TOTAL COMMON SHAREHOLDER'S EQUITY
Stockholders' Equity Attributable to Parent
Noncontrolling Interests
Stockholders' Equity Attributable to Noncontrolling Interest
TOTAL EQUITY
Members' Equity
TOTAL LIABILITIES AND EQUITY
Liabilities and Equity
Document and Entity Information [Abstract]
Document And Entity Information.
Entities [Table]
Entities [Table]
Entity Registrant Name
Entity Registrant Name
Entity Central Index Key
Entity Central Index Key
Document Type
Document Type
Amendment Flag
Amendment Flag
Document Fiscal Year Focus
Document Fiscal Year Focus
Document Fiscal Period Focus
Document Fiscal Period Focus
Current Fiscal Year End Date
Current Fiscal Year End Date
Entity Filer Category
Entity Filer Category
Entity Emerging Growth Company
Entity Emerging Growth Company
Entity Small Business
Entity Small Business
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Cash Flow Hedges, Tax
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax
Amortization of Pension and OPEB Deferred Costs, Tax
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax
Statement of Cash Flows [Abstract]
Operating Activities
Net Cash Provided by (Used in) Operating Activities [Abstract]
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]
Depreciation and Amortization
Utilities Operating Expense, Depreciation and Amortization
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).
Deferred Income Taxes
Deferred Income Tax Expense (Benefit)
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.
Carrying Costs Income
Carrying Costs Income
Income recorded to accrue a return on certain regulatory assets as granted by a regulator.
Allowance for Equity Funds Used During Construction
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity
Mark-to-Market of Risk Management Contracts
Unrealized Gain (Loss) on Derivatives
Amortization of Nuclear Fuel
Amortization of Nuclear Fuel
The expense charged against earnings for the periodic recognition of nuclear fuel usage.
Property Taxes
Amortization of Deferred Property Taxes
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.
Customer Refund Liability, Current
Provision for Refund
Provision for Refund
Recovery of Ohio Capacity Costs
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.
Provision for Refund - Global Settlement
Provision for Refund - Global Settlement
Provisions for refund for obligations to customers as a result of the OPCo Global Settlement.
Reversal of a Regulatory Provision
Reversal of a Regulatory Provision
Reversal of a Regulatory Provision.
Change in Other Noncurrent Assets
Increase (Decrease) in Other Noncurrent Assets
Change in Other Noncurrent Liabilities
Increase (Decrease) in Other Noncurrent Liabilities
Changes in Certain Components of Working Capital:
Increase (Decrease) in Operating Capital [Abstract]
Accounts Receivable, Net
Increase (Decrease) in Accounts and Other Receivables
Fuel, Materials and Supplies
Increase (Decrease) in Inventories
Accounts Payable
Increase (Decrease) in Accounts Payable
Accrued Taxes, Net
Increase (Decrease) in Accrued Taxes Payable
Accrued Interest
Increase (Decrease) in Interest Payable, Net
Other Current Assets
Increase (Decrease) in Other Current Assets
Other Current Liabilities
Increase (Decrease) in Other Current Liabilities
Net Cash Flows from (Used for) Operating Activities
Net Cash Provided by (Used in) Operating Activities
Investing Activities
Net Cash Provided by (Used in) Investing Activities [Abstract]
Construction Expenditures
Payments for Construction in Process
Change in Advances to Affiliates, Net
Increase (Decrease) in Notes Receivable, Related Parties
Purchases of Investment Securities
Payments to Acquire Investments
Sales of Investment Securities
Proceeds from Sale, Maturity and Collection of Investments
Acquisitions of Nuclear Fuel
Payments for Nuclear Fuel
Payments to Acquire Property, Plant, and Equipment
Payments to Acquire Property, Plant, and Equipment
Other Investing Activities
Payments for (Proceeds from) Other Investing Activities
Net Cash Flows from (Used for) Investing Activities
Net Cash Provided by (Used in) Investing Activities
Financing Activities
Net Cash Provided by (Used in) Financing Activities [Abstract]
Capital Contributions from Parent
Issuance of Common Stock, Net
Proceeds from Issuance of Common Stock
Issuance of Long-term Debt
Proceeds from Issuance of Long-term Debt
Commercial Paper and Credit Facility Borrowings
Proceeds from Short-term Debt, Maturing in More than Three Months
Change in Short-term Debt, Net
Proceeds from (Repayments of) Short-term Debt, Maturing in Three Months or Less
Change in Advances from Affiliates, Net
Increase (Decrease) in Notes Payable, Related Parties
Retirement of Long-term Debt
Repayments of Long-term Debt
Principal Payments for Finance Lease Obligations
Repayments of Long-term Capital Lease Obligations
Dividends Paid on Common Stock
Payments of Distributions to Affiliates
Dividends Paid on Common Stock
Payments of Ordinary Dividends, Common Stock
Other Financing Activities
Proceeds from (Payments for) Other Financing Activities
Net Cash Flows from (Used for) Financing Activities
Net Cash Provided by (Used in) Financing Activities
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
Net Increase (Decrease) in Cash and Cash Equivalents
Cash and Cash Equivalents, Period Increase (Decrease)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Cash and Cash Equivalents at Beginning of Period
Cash, Cash Equivalents and Restricted Cash at End of Period
Cash and Cash Equivalents at End of Period
Supplementary Information
Supplemental Cash Flow Information [Abstract]
Cash Paid for Interest, Net of Capitalized Amounts
Interest Paid, Excluding Capitalized Interest, Operating Activities
Net Cash Paid (Received) for Income Taxes
Income Taxes Paid, Net
Noncash Acquisitions Under Finance Leases
Capital Lease Obligations Incurred
Construction Expenditures Included in Current Liabilities as of March 31,
Construction in Progress Expenditures Incurred but Not yet Paid
Acquisition of Nuclear Fuel Included in Current Liabilities as of March 31,
Acquisition Of Nuclear Fuel Included In Current Liabilities
Future cash outflow to pay for acquired nuclear fuel.
Noncash Contribution of Assets by Noncontrolling Interest
Noncash or Part Noncash Acquisition, Investments Acquired
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.
Forward Equity Purchase Contract Included Current and Noncurrent Liabilities as of March 31,
Derivatives and Hedging
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Reclassification out of Accumulated Other Comprehensive Income [Axis]
Reclassification out of Accumulated Other Comprehensive Income [Axis]
Reclassification out of Accumulated Other Comprehensive Income [Domain]
Reclassification out of Accumulated Other Comprehensive Income [Domain]
Reclassifications from Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Member]
Product and Service [Axis]
Product and Service [Axis]
Product and Service [Domain]
Product and Service [Domain]
Purchased Electricity for Resale [Member]
Electricity, Purchased [Member]
Derivative Instrument [Axis]
Derivative Instrument [Axis]
Derivative Contract [Domain]
Derivative Contract [Domain]
Commodity [Member]
Commodity Contract [Member]
Interest Rate [Member]
Interest Rate [Member]
Interest Rate Member.
Cash Flow Hedges [Member]
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Securities Available for Sale [Member]
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Pension and OPEB [Member]
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Changes In Accumulated Other Comprehensive Income by Component [Abstract]
Beginning Balance in AOCI
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).
Reclassifications From Accumulated Other Comprehensive Income
Reclassifications From Accumulated Other Comprehensive Income [Abstract]
Commodity
Commodity [Abstract]
Commodity.
Purchased Electricity for Resale
Cost of Goods and Services Sold
Interest Rate
Interest Rate [Abstract]
Interest Expense
Interest Expense
Amortization Of Pension And Other Postretirement Benefit Plans
Amortization Of Pension And Other Postretirement Benefit Plans [Abstract]
Amortization of Prior Service Cost (Credit)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax
Amortization of Actuarial (Gains) Losses
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax
Reclassifications from AOCI, before Income Tax (Expense) Benefit
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax
Income Tax (Expense) Benefit
Income Tax Expense (Benefit)
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax
Net Current Period Other Comprehensive Income (Loss)
Ending Balance in AOCI
Regulated Generating Unit Expected to be Retired by 2020 [Table Text Block]
Disposal Groups, Including Discontinued Operations [Table Text Block]
Regulatory Assets Pending Final Regulatory Approval
Schedule of Regulatory Assets [Table Text Block]
Total Estimated Distribution-Related System Restoration Costs [Table Text Block]
Total Estimated Distribution-Related System Restoration Costs [Table Text Block]
Total Estimated Distribution-Related System Restoration Costs [Table Text Block]
Noncurrent Regulatory Assets [Axis]
Noncurrent Regulatory Assets [Axis]
Noncurrent Regulatory Assets Axis
Regulatory Assets [Domain]
Regulatory Assets [Domain]
Regulatory Assets Domain
Asset Retirement Obligation - Arkansas, Louisiana [Member]
Asset Retirement Obligation - Arkansas, Louisiana [Member]
Asset Retirement Obligation - Arkansas, Louisiana [Member]
Kentucky Deferred Purchase Power Expenses [Member]
Kentucky Deferred Purchase Power Expenses [Member]
Kentucky Deferred Purchase Power Expenses [Member]
Oklaunion Power Station Accelerated Depreciation [Member]
Oklaunion Power Station Accelerated Depreciation [Member]
Oklaunion Power Station Accelerated Depreciation [Member]
Other Regulatory Assets Pending Final Regulatory Approval [Member]
Other Regulatory Assets Pending Final Regulatory Approval [Member]
Other Regulatory Assets Pending Final Regulatory Approval [Member]
Plant Retirement Costs - Asset Retirement Obligation Costs
Asset Retirement Obligation Related to Retired Plants [Member]
Asset Retirement Obligation Related to Retired Plants [Member]
Plant Retirement Costs - Materials and Supplies [Member]
Materials and Supplies Related to Retired Plants [Member]
Materials and Supplies Related to Retired Plants [Member]
Plant Retirement Costs - Unrecovered Plant [Member]
Plant Retirement Costs - Unrecovered Plant [Member]
Plant Retirement Costs - Unrecovered Plant [Member]
Rate Case Expense - Texas [Member]
Rate Case Expense - Texas [Member]
Rate Case Expense - Texas [Member]
Rate Case Expense [Member]
Rate Case Expense [Member]
Rate Case Expense.
Storm Related Costs [Member]
Storm Costs [Member]
Storm Costs Hurricane Harvey [Member]
Storm Costs Hurricane Harvey [Member]
Storm Costs Hurricane Harvey [Member]
Regulatory Asset Return Disclosure [Axis]
Regulatory Asset Return Disclosure [Axis]
Regulatory Asset Return Disclosure Axis
Regulatory Assets Return Disclosure [Domain]
Regulatory Assets Return Disclosure [Domain]
Regulatory Assets Return Disclosure Domain
Regulatory Assets Currently Earning Return [Member]
Regulatory Assets Currently Earning Return [Member]
Regulatory Assets Currently Earning a Return
Regulatory Assets Currently Not Earning Return [Member]
Regulatory Assets Currently Not Earning Return [Member]
Regulatory Assets Currently Not Earning a Return
Regulated Status [Axis]
Regulated Status [Axis]
Regulated Status Axis
Regulated Status [Domain]
Regulated Status [Domain]
Regulated Status Domain
Regulatory Assets Pending Final Regulatory Approval [Member]
Regulatory Assets Pending Final Regulatory Approval [Member]
Regulatory Assets Pending Final Regulatory Approval [Member]
Oklaunion Generating Station [Member]
Oklaunion Generating Station (Unit No. 1) [Member]
Oklaunion Generating Station (Unit No. 1) Member
Property, Plant and Equipment, Type [Axis]
Property, Plant and Equipment, Type [Axis]
Property, Plant and Equipment, Type [Domain]
Property, Plant and Equipment, Type [Domain]
Generating Units Probable of Abandonment [Member]
Generating Units Probable of Abandonment [Member]
Generating Units Probable of Abandonment [Member]
Gross Investment
Total Property, Plant and Equipment - Net
Oklaunion Power Station Accelerated Depreciation
Oklaunion Power Station Accelerated Depreciation
The amount of accelerated depreciaiton deferred as a regulatory asset for the Oklaunion Power Station
Materials and Supplies
Regulatory Liability, Noncurrent
Expected Retirement Date
Disposal Group, Including Discontinued Operation, Description and Timing of Disposal
Remaining Recovery Period, Plant Depreciation
Remaining Recovery Period, Plant Depreciation
The remaining amortization period for recovery of the plant depreciation.
Regulatory Assets, Noncurrent
Asset Impairment Charges [Abstract]
Sempra Renewables LLC [Member]
Sempra Renewables LLC [Member]
Sempra Renewables LLC [Member]
Impaired Long-Lived Assets Held and Used by Type [Axis]
Impaired Long-Lived Assets Held and Used by Type [Axis]
Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Other Assets [Member]
Other Assets [Member]
Segments [Axis]
Segments [Axis]
Segments [Domain]
Segments [Domain]
Generation And Marketing [Member]
Generation And Marketing [Member]
Generation And Marketing [Member]
Corporate and Other [Member]
Corporate and Other [Member]
Wind Generation (MWs)
Wind Generation (MWs)
Wind Generation (MWs).
Noncash or Part Noncash Acquisition, Value of Assets Acquired
Noncash or Part Noncash Acquisition, Value of Assets Acquired
Payments to Acquire Businesses, Gross
Payments to Acquire Businesses, Gross
Noncash or Part Noncash Acquisition, Debt Assumed
Noncash or Part Noncash Acquisition, Debt Assumed
Noncash or Part Noncash Acquisition, Other Assets Acquired
Noncash or Part Noncash Acquisition, Other Assets Acquired
Asset Impairment and Other Related Charges
Asset Impairment Charges
Leases [Abstract]
Lease Policy
Lessee, Leases [Policy Text Block]
Debt Disclosure [Abstract]
Financing Activities
Debt Disclosure [Text Block]
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Domain]
Concentration Risk Benchmark [Domain]
Vertically Integrated Utilities Revenues [Member]
Vertically Integrated Utilities Revenues [Member]
Vertically Integrated Utilities Revenues.
Generation & Marketing Revenues [Member]
Generation and Marketing Revenues [Member]
Generation and Marketing Revenues.
Electric Generation, Transmission and Distribution Revenues [Member]
Electric Generation Transmission Distribution Revenues [Member]
Electric Generation, Transmission and Distribution Revenues.
Purchased Electricity for Resale [Member]
Purchased Electricity for Resale [Member]
Purchased Electricity for Resale.
Other Operation Expense [Member]
Other Operation Expense [Member]
Other operation expense.
Maintenance Expense [Member]
Maintenance Expense [Member]
Maintenance expense.
Regulatory Assets [Member]
Regulatory Assets [Member]
Regulatory Assets.
Regulatory Liabilities [Member]
Regulatory Liabilities [Member]
Regulatory 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.
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.
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.
Power [Member]
Power Contract Member [Member]
Nominal energy measure used to calculate payments on a derivative instrument.
Natural Gas [Member]
Heating Oil and Gasoline [Member]
Heating Oil And Gasoline Contract Member [Member]
Nominal volume used to calculate payments on a derivative instrument.
Interest Rate Contract [Member]
Interest Rate Contract [Member]
Risk Management Contracts [Member]
Hedging Contracts [Member]
Hedging Contracts [Member]
Carrying Amount of Hedged Asset (Liability)
Carrying Amount of Hedged Asset (Liability)
Carrying Amount of Hedged Asset (Liability)
Derivative, Gain (Loss) on Derivative, Net
Derivative, Gain (Loss) on Derivative, Net
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.
Notional Volume Of Derivative Instruments
Notional Volume Of Derivative Instruments [Abstract]
Notional Volume Of Derivative Instruments Abstract.
Commodity:
Derivative, Energy Notional Amount
Derivative Nonmonetary Energy Notional Amount
Volume of energy derivative contracts.
Derivative, Volume Notional Amount
Derivative Nonmonetary Volume Notional Amount
Volume of heating oil and gasoline derivative contracts.
Derivative, Notional Amount
Derivative, Notional Amount
Cash Collateral Netting
Cash Collateral Netting [Abstract]
Cash collateral netting detail.
Cash Collateral Received Netted Against Risk Management Assets
Securities Received as Collateral
Cash Collateral Paid Netted Against Risk Management Liabilities
Obligation to Return Securities Received as Collateral
Fair Value of Derivative Instruments
Derivative Instrument Detail [Abstract]
Current Risk Management Assets
Total Assets
Current Risk Management Liabilities
Long-term Risk Management Liabilities
Derivative Liability
Total MTM Derivative Contract Net Assets (Liabilities)
Derivative Assets (Liabilities), at Fair Value, Net
Amount of Gain (Loss) Recognized on Risk Management Contracts
Gain (Loss) on Derivative Instruments, Net, Pretax [Abstract]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Gain (Loss) on Derivative Instruments, Net, Pretax
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.
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.
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
Portion Expected to be Reclassified to Net Income During the Next Twelve Months
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months
Collateral Triggering Events
Collateral Triggering Events [Abstract]
Collateral Triggering Events Abstract.
Liabilities for Contracts with Cross Default Provisions Prior to Contractual Netting Arrangements
Fair Value Of Derivative Liabilities Subject To Cross Default Provisions
Fair value of derivative liabilities subject to cross-default provisions.
Amount of Cash Collateral Posted
Collateral Already Posted, Aggregate Fair Value
Additional Settlement Liability if Cross Default Provision is Triggered
Assets Needed for Immediate Settlement, Aggregate Fair Value
Derivatives and Hedging (Textuals)
Derivatives and Hedging Textuals [Abstract]
Derivatives and Hedging Textuals
Maximum Term for Exposure to Variability of Future Cash Flows
Maximum Length of Time Hedged in Price Risk Cash Flow Hedge
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
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)
Tax Issue [Axis]
Tax Issue [Axis]
Tax Issue [Axis]
Tax Issue [Domain]
Tax Issue [Domain]
[Domain] for Tax Issue [Axis]
Amortization of Excess ADIT [Member]
Amortization of Excess ADIT [Member]
Amortization of Excess ADIT [Member]
Parent Company Loss Benefit [Member]
Parent Company Loss Benefit [Member]
Parent Company Loss Benefit [Member]
Flow-Through Items [Member]
Flow-Through Items [Member]
Flow-Through Items [Member]
State Tax Expense [Member]
State Tax Expense [Member]
State Tax Expense [Member]
Federal Statutory Income Tax Rate
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Effective Income Tax Rate
Effective Income Tax Rate Reconciliation, Percent
Effective Income Tax Rate Reconciliation, Variance Explanation, Amount
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount
Effective Income Tax Rate Reconciliation, Variance Explanation, Percent
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent
Valuation Techniques
Fair Value Measurement, Policy [Policy Text Block]
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.
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.
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.
Commitments Guarantees and Contingencies [Abstract]
Maturity of Credit Facility [Axis]
Maturity of Credit Facility [Axis]
Maturity of Credit Facility
Maturity of Credit Facility [Domain]
maturityofcreditfacility [Domain]
[Domain] for maturityofcreditfacility [Axis]
June 2022 [Member]
June 2022 [Member]
June 2022
July 2019 [Member]
July 2019 [Member]
July 2019 [Member]
Guarantor Obligations by Nature [Axis]
Guarantor Obligations, Nature [Axis]
Guarantor Obligations, Nature [Domain]
Guarantor Obligations, Nature [Domain]
Letters of Credit [Member]
Letters of Credit [Member]
Letters of Credit Member.
Guarantees of Third Party Obligations [Member]
Guarantees of Third Party Obligations [Member]
Guarantees of Third Party Obligations Member.
Guarantees of Equity Method Investees [Member]
Guarantees of Equity Method Investees [Member]
Guarantees of Equity Method Investees [Member]
Maximum Future Payments for Letters of Credit Under Uncommitted Facilities
Maximum Future Payments for Letters of Credit Under Uncommitted Facilities [Abstract]
Maximum Future Payments for Letters of Credit Under Uncommitted Facilities [Abstract]
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.
Commitments, Guarantees and Contingencies (Textuals)
Commitments Guarantees And Contingencies Textuals [Abstract]
Commitments, Guarantees and Contingencies.
Revolving Credit Facilities
Credit Facilities Structured
Amount of revolving credit facilities.
Letters of Credit Limit
Line of Credit Facility, Maximum Borrowing Capacity
Uncommitted Facility
Uncommitted Facility
Amount of letters of credit drawn on an uncommitted credit facility.
Variable Rate PCBs Supported
Variable Rate PCBs Supported
Amount of Pollution Control Bonds supported by bilateral letters of credit.
Letters of Credit Outstanding, Amount
Letters of Credit Outstanding, Amount
Guarantees of Mine Reclamation, Amount
Guarantees Of Mine Reclamation Amount
Guarantees of mine reclamation, amount.
Mine Reclamation and Closing Liability, Noncurrent
Mine Reclamation and Closing Liability, Noncurrent
Total Amount Collected through a Rider for Final Mine Closure and Reclamation Costs
Amount Collected Through Rider For Final Mine Closure And Reclamation Costs
Total amount collected through a rider for final mine closure and reclamation costs.
Amount Collected through a Rider for Final Mine Closure - ARO Noncurrent
Amount Collected, Rider Mine Close ARO Noncurrent
Amount collected through a rider for final mine closure and reclamation costs recorded in asset retirement obligations
Amount Collected, Rider Mine Close Other Assets Noncurrent
Amount Collected, Rider Mine Close Other Assets Noncurrent
Amount collected through a rider for final mine closure and reclamation costs recorded in deferred charges and other noncurrent assets.
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
Utility Plant Generation Capacity
Utility Plant Generation Capacity
Generating capacity of utility plants.
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Servicing Contracts [Member]
Servicing Contracts [Member]
July 2020 [Member]
July 2020 [Member]
July 2020
July 2021 [Member]
July 2021 [Member]
July 2021
Short-term Debt, Type [Axis]
Short-term Debt, Type [Axis]
Short-term Debt, Type [Domain]
Short-term Debt, Type [Domain]
Commercial Paper [Member]
Commercial Paper [Member]
Transource Energy [Member]
Transource Energy [Member]
Transource Energy [Member]
Debt Instrument [Axis]
Debt Instrument [Axis]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Junior Subordinated Notes [Member]
Junior Subordinated Notes [Member]
Junior Subordinated Notes have a lower priority than senior instruments in the event of liquidation of the entity's assets.
Notes Payable [Member]
Notes Payable, Other Payables [Member]
Notes Payable Two [Member]
Notes Payable, Other Payable Two [Member]
A written promise to pay a note to a third party.
Notes Payable Three [Member]
Notes Payable, Other Payable Three [Member]
A written promise to pay a note to a third party.
Notes Payable Four [Member]
Notes Payable, Other Payable Four [Member]
A written promise to pay a note to a third party.
Notes Payable Five [Member]
Notes Payable, Other Payable Five [Member]
A written promise to pay a note to a third party.
Notes Payable, Six [Member]
Notes Payable, Other Payables Six [Member]
A written promise to pay a note to a third party.
Other Long Term Debt [Member]
Other Long Term Debt [Member]
Other long term debt member
Pollution Control Bonds [Member]
Pollution Control Bonds [Member]
Pollution Control Bonds Member.
Securitization Bonds [Member]
Securitization Bonds [Member]
A collateralized debt obligation (backed by pledge, mortgage or other lien on the entity's assets).
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.
Money Pool Participant by Company Type [Axis]
Money Pool Participant by Company Type [Axis]
Money Pool Participant by Company Type.
Money Pool Participant by Company Type [Domain]
Money Pool Participant by Company Type [Domain]
Money Pool Participant by Company Type.
Utility [Member]
Utility [Member]
Utility Company.
Nonutility [Member]
Nonutility [Member]
Nonutility Company.
Direct Borrowing [Member]
Direct Borrowing [Member]
Direct Borrowing and Loans from and to Parent
Long-term Debt
Long-term Debt, Unclassified [Abstract]
Senior Unsecured Notes
Unsecured Debt
Pollution Control Bonds
Long-term Pollution Control Bond
Notes Payable
Other Notes Payable
Securitization Bonds
Secured Debt
Spent Nuclear Fuel Obligation
Spent Nuclear Fuel Obligation, Noncurrent
Junior Subordinated Notes
Junior Subordinated Notes
Other Long-term Debt
Other Long-term Debt
Total Long-term Debt Outstanding
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.
Issuances
Proceeds from Issuance of Debt
Retirements and Principal Payments
Debt Instrument, Interest Rate, Stated Percentage
Debt Instrument, Interest Rate, Stated Percentage
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.
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.).
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]
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.
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.
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.
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.
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.
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.
Net Loans (Borrowings) to/from Utility Money Pool
Related Party Transaction, Due from (to) Related Party, Current
Authorized Short Term Borrowing Limit
Authorized Short Term Borrowing Limit
Authorized Short-term Borrowing Limit by regulatory orders.
Maximum and Minimum Interest Rates
Maximum and Minimum Interest Rates [Abstract]
Maximum and Minimum Interest Rates.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Securitized Debt for Receivables
Commercial Paper
Commercial Paper
Securitized Debt for Receivables
Short-term Debt, Weighted Average Interest Rate, at Point in Time
Weighted Average Interest Rate
Debt, Weighted Average Interest Rate
Comparative Accounts Receivable Information
Proceeds from Sale and Collection of Other Receivables [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.
Net Uncollectible Accounts Receivable Written Off
Net Uncollectible Accounts Receivable Written Off
Net uncollectible accounts receivable written off.
Customer Accounts Receivable Managed Portfolio
Customer Accounts Receivable Managed Portfolio [Abstract]
Customer accounts receivable managed portfolio.
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.
Total Principal Outstanding
Principal Amount Outstanding on Loans Held-for-sale or Securitization or Asset-backed Financing Arrangement
Delinquent Securitized Accounts Receivable
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement
Bad Debt Reserves Related to Securitization 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.
Unbilled Receivables Related to Securitization 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.
Accounts Receivable and Accrued Unbilled Revenues
Receivables Held-for-sale [Abstract]
Accounts Receivable and Accrued Unbilled Revenues
Receivables Held-for-sale, Amount
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold [Abstract]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Revenue from Contract with Customer, Including Assessed Tax
Proceeds from Sale of Receivables
Proceeds from Sale and Collection of Receivables [Abstract]
Proceeds from Sale of Receivables to AEP Credit
Proceeds from Sale of Finance Receivables
Financing Activities (Textuals)
Financing Activities Textuals [Abstract]
Financing Activities.
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.
Reacquired Pollution Controls Bonds Held by Trustees
Auction Rate Tax Exempt Long Term Debt Outstanding
Securities that are debt instruments (corporate or municipal bonds) that typically have long-term nominal maturities for which the interest rate is reset through an auction process.
Equity Units Issued
Equity Units Issued
The amount of AEP Equity Units Issued in connection with the March 2019 issuance of Junior Subordinated Notes.
Per unit conversion for equity units
Per Unit Conversion for Equity Units
The PAR value for each equity unit as issued
Net Equity Units Proceeds
Net Equity Units Issuance Proceeds
Net Equity Units proceeds after issuance costs
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.
Equity Units Annual Distribution Rate
Equity Units Annual Distribution Rate
Equity Units Annual Distribution Rate
Forward Equity Contract Payment Rate
Forward Equity Contract Payment Rate
Forward Equity Contract Payment Rate
AEP Share Price For Equity Unit Conversion
Aep Share Price For Equity Unit Conversion
The AEP share price related to the Equity Unit share conversion
Shares Per Equity Unit
Shares Per Equity Unit
Amount of shares issued per equity unit at maturity
Stockholders' Equity, Other
Maximum Shares Issued Under Equity Units
Maximum Shares Issued Under Equity Units Conversion
The maximum shares that can be issued related to AEP's Equity Units
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.
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.
Tangible Capital to Tangible Assets
Tangible Capital to Tangible Assets
Maximum Percentage Debt to Capitalization
Maximum Percentage Debt to Capitalization
Maximum level of debt to capitalization persuant to credit agreement leverage restrictions.
Total Commitment from Bank Conduits to Finance Receivables
Total Commitment From Bank Conduits To Finance Receivables
Total commitment from bank conduits to finance receivables.
Commitment From Bank Conduits To Finance Receivables
Commitment From Bank Conduits To Finance Receivables
Commitment From Bank Conduits To Finance Receivables
Sale Leaseback Transaction, Description [Axis]
Sale Leaseback Transaction, Description [Axis]
Sale Leaseback Transaction, Name [Domain]
Sale Leaseback Transaction, Name [Domain]
Rockport Lease [Member]
Rockport Lease [Member]
Lease Type One.
Lease Rental Costs
Lease, Cost [Table Text Block]
Supplemental Balance Sheet Information Related to Leases
Supplemental Balance Sheet Information Related to Leases [Table Text Block]
Supplemental Balance Sheet Information Related to Leases
Property, Plant and Equipment and Related Obligations Under Finance Leases
Property Plant and Equipment and Related Obligations Under Finance Leases [Table Text Block]
Property, Plant and Equipment and Related Obligations Under Finance Leases.
Operating Lease Assets and Related Obligations
Operating Lease Assets and Related Obligations [Table Text Block]
Operating Lease Assets and Related Obligations
Finance Lease Liabilities Rolling Future Minimum Lease Payments
Finance Lease, Liability, Maturity [Table Text Block]
Operating Lease Liabilities Rolling Future Minimum Lease Payments
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
Future Minimum Lease Payments
Future Minimum Lease Payments [Table Text Block]
Future Minimum Lease Payments.
Maximum Potential Loss
Max Potential Loss on Master Lease Agreements [Table Text Block]
Max potential loss on master lease agreements.
Future Minimum Lease Payments
Future Minimum Lease Payments for Sale and Leaseback [Table Text Block]
Future Minimum Lease Payments for sale-and-leaseback.
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]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Virginia Legislation Affecting Earnings Reviews [Member]
Virginia Legislation Affecting Biennial Reviews [Member]
Virginia Legislation Affecting Biennial Reviews [Member]
Virginia Staff Depreciation Study Request [Member]
Virginia Staff Depreciation Study Request [Member]
Virginia Staff Depreciation Study Request [Member]
Virginia Tax Reform [Member]
Virginia Tax Reform [Member]
Virginia Tax Reform [Member]
2018 West Virginia Base Rate Case [Member]
2018 West Virginia Base Rate Case [Member]
2018 West Virginia Base Rate Case [Member]
Michigan Tax Reform [Member]
Michigan Tax Reform [Member]
Michigan Tax Reform [Member]
Ohio Electric Security Plan Filing [Member]
Ohio Electric Security Plan Filing [Member]
Ohio Electric Security Plan Filing
2016 SEET Filing [Member]
2016 SEET Filing [Member]
2016 SEET Filing [Member]
FERC Transmission Complaint [Member]
FERC Transmission Complaint [Member]
FERC Transmission Complaint [Member]
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
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.
Potential Increase to Total Annual Depreciation Rates
Potential Increase to Total Annual Depreciation Rates
The potential increase in annual depreciation rates if the Virginia SCC issues an order to change depreciation rates as a result of a depreciation study.
Potential Increase to Annual Transmission Depreciation Rates
Potential Increase to Annual Transmission Depreciation Rates
The potential increase in annual transmission depreciation rates if the Virginia SCC issues an order to change depreciation rates as a result of a depreciation study.
Refund Due to Tax Reform
Refund Due to Tax Reform
Additional ongoing refund due to Tax Reform
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.
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.
One Time Refund of Estimated Excess Taxes Collected
One Time Refund of Estimated Excess Taxes Collected
One time refund to customers for overcollected taxes due to Tax Reform.
Amount of Increase Related to Annual Depreciation Rates
Amount of Increase Related to Annual Depreciation Rates
Amount of increased depreciation expense approved.
Approved Amount of Increase Related to Annual Depreciation Rates
Approved Amount of Increase Related to Annual Depreciation Rates
Amount of increase related to annual depreciation rates
Regulatory Assets Used to Offset Tax Savings and Excess ADIT Due to Tax Reform
Regulatory Assets Used to Offset Tax Savings and Excess ADIT Due to Tax Reform
Amount of regulatory assets used to offset tax savings and Excess ADIT due to Tax Reform.
Adjusted Annual Increase Request due to Tax Reform
Adjusted Annual Increase Request due to Tax Reform
Decrease in original requested annul increase due to tax reform
Return on Common Equity Filed in the Pending Stipulation Agreement
Return on Common Equity Filed in the Pending Stipulation Agreement
Return on common equity filed during August 2017 in the pending stipulation agreement.
Rate Caps Related to the Distribution Investment Rider Range
Rate Caps Related to the Distribution Investment Rider Range
Rate caps related to OPCo's Distribution Investment Rider range for the periods 2018 through 2021.
Staff Calculated Overspending
Staff Calculated Overspending
Staff calculated overspending related to ESRR authorized under the ESP.
Provision for Refund
Intervenor Recommended Return on Common Equity
Intervenor Recommended Return on Common Equity
Amount of return on equity recommended by intervenors.
One Time Refund to Customers Per Settlement Agreement
One Time Refund to Customers Per Settlement Agreement
Settlement agreement filed with the FERC for a one time refund to customers
Increased Cap on Equity Portion of the Capital Structure Per Settlement Agreement
Increased Cap on Equity Portion of the Capital Structure Per Settlement Agreement
Increased cap on equity portion of the capital structure as part of settlement agreement filed at the FERC
Original Cap on Equity Portion of the Capital Structure Prior to Settlement Agreement
Original Cap on Equity Portion of the Capital Structure Prior to Settlement Agreement
The original cap on equity portion of the capital structure prior to settlement agreement.
Retirement Plan Type [Axis]
Retirement Plan Type [Axis]
Retirement Plan Type [Domain]
Retirement Plan Type [Domain]
Pension Plans [Member]
Pension Plan [Member]
Other Postretirement Benefit Plans [Member]
Other Postretirement Benefits Plan [Member]
Components of Net Periodic Benefit Cost
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service Cost
Defined Benefit Plan, Service Cost
Interest Cost
Defined Benefit Plan, Interest Cost
Expected Return on Plan Assets
Defined Benefit Plan, Expected Return (Loss) on Plan Assets
Amortization of Prior Service Cost (Credit)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)
Amortization of Net Actuarial Loss
Defined Benefit Plan, Amortization of Gain (Loss)
Net Periodic Benefit Cost (Credit)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)
Fair Value Measurements
Fair Value Disclosures [Text Block]
Revision [Axis]
Restatement [Axis]
Revision [Domain]
Restatement [Domain]
Previously Reported [Member]
Previously Reported [Member]
Revision [Member]
Restatement Adjustment [Member]
Antidilutive Securities [Axis]
Antidilutive Securities [Axis]
Antidilutive Securities, Name [Domain]
Antidilutive Securities, Name [Domain]
Restricted Stock Units and Performance Share Units [Member]
Restricted Stock Units and Performance Share Units [Member]
Basic and Diluted EPS Calculations
Earnings Per Share [Abstract]
Amounts Attributable to AEP Common Shareholders
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS
Weighted Average Number of Basic AEP Common Shares Outstanding
Weighted Average Number of Shares Outstanding, Basic
Total Basic Earnings Per Share Attributable to AEP Common Shareholders
Earnings Per Share, Basic
Weighted Average Dilutive Effect of:
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Weighted Average Dilutive Effect of Shares
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements
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.
Weighted Average Number of Diluted AEP Common Shares Outstanding
Weighted Average Number of Shares Outstanding, Diluted
Total Diluted Earnings Per Share Attributable to AEP Common Shareholders
Earnings Per Share, Diluted
Cash, Cash Equivalents and Restricted Cash
Cash, Cash Equivalents and Restricted Cash [Abstract]
Cash, Cash Equivalents and Restricted Cash [Abstract]
Cash and Cash Equivalents
Restricted Cash
Total Cash, Cash Equivalents and Restricted Cash
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations
Total Cash, Cash Equivalents and Restricted Cash
Income Statement
Income Statement [Abstract]
Revenues
Revenues [Abstract]
TOTAL REVENUES
Revenues
Expenses
Operating Expenses [Abstract]
TOTAL EXPENSES
Operating Expenses
OPERATING INCOME (LOSS)
Operating Income (Loss)
Nonoperating Income (Expense)
Other Nonoperating Income (Expense) [Abstract]
Allowance for Equity Funds Used During Construction
Interest Expense
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest
Income Tax Expense (Benefit)
NET INCOME (LOSS)
Statement of Cash Flows
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities
Utilities Operating Expense, Depreciation and Amortization
Supplementary Information
Supplementary Information [Abstract]
Supplementary Information.
Construction in Progress Expenditures Incurred but Not yet Paid
Organization and Summary of Significant Accounting Policies (Textuals)
Organization and Summary of Significant Accounting Policies Textuals [Abstract]
Organization and Summary of Significant Accounting Policies.
Antidilutive Shares Outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Error Corrections and Prior Period Adjustments, Description
Error Corrections and Prior Period Adjustments, Description
Retained Earnings
Revenue from Contracts with Customers
Revenue from Contract with Customer [Text Block]
Sabine Mining Co [Member]
Sabine Mining Co [Member]
Sabine Mining Company Variable Interest Entity Member
Balance Sheet Location [Axis]
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Balance Sheet Location [Domain]
Finance Lease Assets [Member]
Finance Lease Assets [Member]
Finance Lease Assets.
Finance Lease Liabilities [Member]
Finance Lease Liabilities [Member]
Finance Lease Liabilities.
Operating Lease Assets [Member]
Operating Lease Assets [Member]
Operating Lease Assets
Major Property Class [Axis]
Major Property Class [Axis]
Major Property Class [Domain]
Major Property Class [Domain]
Boat and Barge Leases [Member]
Boat and Barge Leases [Member]
Boat and Barge Leases [Member]
Lease Rental Costs
Lease, Cost [Abstract]
Operating Lease, Cost
Operating Lease, Cost
Finance Lease Right-of-Use Asset Amortization
Finance Lease, Right-of-Use Asset, Amortization
Interest Expense on Finance Leases
Finance Lease, Interest Expense
Total Lease Rental Costs
Total Lease Rental Costs
Total Lease Rental Costs.
Supplemental Information Related to Leases
Supplemental Information Related to Leases [Abstract]
Supplemental Information Related to Leases
Weighted-Average Remaining Lease Term, Operating Leases
Operating Lease, Weighted Average Remaining Lease Term
Weighted Average Remaining Lease Term, Finance Leases
Finance Lease, Weighted Average Remaining Lease Term
Weighted Average Discount Rate, Operating Leases
Operating Lease, Weighted Average Discount Rate, Percent
Weighted Average Discount Rate, Finance Leases
Finance Lease, Weighted Average Discount Rate, Percent
Operating Cash Flows from Operating Leases
Operating Lease, Payments
Operating Cash Flows from Finance Leases
Finance Lease, Interest Payment on Liability
Financing Cash Flows from Finance Leases
Finance Lease, Principal Payments
Non-cash Acquisitions Under Operating Leases
Non-cash Acquisitions Under Operating Leases
Non-cash Acquisitions Under Operating Leases
Property, Plant and Equipment and Other Related Obligations Under Finance Leases
Property, Plant and Equipment and Other Related Obligations Under Finance Leases [Abstract]
Property, Plant and Equipment and Other Related Obligations Under Finance Leases
Other Property, Plant and Equipment
Accumulated Amortization
Net Property, Plant and Equipment Under Finance Leases
Finance Lease, Right-of-Use Asset
Obligations Under Finance Leases Noncurrent
Finance Lease Liability Due Within One Year
Estimated Present Value of Future Minimum Lease Payments on Finance Leases
Finance Lease, Liability
Operating Lease Asset and Related Obligations
Operating Lease Asset and Related Obligations [Abstract]
Operating Lease Asset and Related Obligations
Operating Lease Assets, Noncurrent
Operating Lease Noncurrent Liability
Operating Lease Liability Due Within One Year
Total Obligations Under Operating Leases
Operating Lease, Liability
Finance Lease Liabilities Rolling Future Minimum Lease Payments
Finance Lease Liabilities, Payments, Rolling Maturity [Abstract]
Finance Leases, Year 1
Finance Lease, Liability, Payments, Due in Next Rolling Twelve Months
Finance Leases, Year 2
Finance Lease, Liability, Payments, Due in Rolling Year Two
Finance Leases, Year 3
Finance Lease, Liability, Payments, Due in Rolling Year Three
Finance Leases, Year 4
Finance Lease, Liability, Payments, Due in Rolling Year Four
Finance Leases, Year 5
Finance Lease, Liability, Payments, Due in Rolling Year Five
Finance Leases, Later Years
Finance Lease, Liability, Payments, Due in Rolling after Year Five
Finance Leases, Total Future Minimum Lease Payments
Finance Lease, Liability, Payments, Due
Imputed Interest on Finance Leases
Finance Lease, Liability, Undiscounted Excess Amount
Operating Lease Liabilities Rolling Future Minimum Lease Payments
Operating Lease Liabilities, Payments, Due, Rolling Maturity [Abstract]
Operating Leases, Year 1
Lessee, Operating Lease, Liability, Payments, Due Next Rolling Twelve Months
Operating Leases, Year 2
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Two
Operating Leases, Year 3
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Three
Operating Leases, Year 4
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Four
Operating Leases, Year 5
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Five
Operating Leases, Later Years
Lessee, Operating Lease, Liability, Payments, Due after Rolling Year Five
Operating Leases, Total Future Minimum Lease Payments
Lessee, Operating Lease, Liability, Payments, Due
Imputed Interest on Operating Leases
Lessee, Operating Lease, Liability, Undiscounted Excess Amount
Estimated Present Value of Future Minimum Lease Payments on Operating Leases
Finance Lease Future Minimum Lease Payments
Finance Leases Future Minimum Lease Payments [Abstract]
Finance Leases Future Minimum Lease Payments
Capital Leases, 2019
Capital Leases, Future Minimum Payments Due, Next Twelve Months
Capital Leases, 2020
Capital Leases, Future Minimum Payments Due in Two Years
Capital Leases, 2021
Capital Leases, Future Minimum Payments Due in Three Years
Capital Leases, 2022
Capital Leases, Future Minimum Payments Due in Four Years
Capital Leases, 2023
Capital Leases, Future Minimum Payments Due in Five Years
Capital Leases, Later Years
Capital Leases, Future Minimum Payments Due Thereafter
Capital Leases, Total Future Minimum Payments Due
Capital Leases, Future Minimum Payments Due
Estimated Interest Element on Capital Leases
Capital Leases, Future Minimum Payments, Interest Included in Payments
Estimated Present Value of Future Minimum Lease Payments on Capital Leases
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments
Operating Lease Future Minimum Lease Payments
Operating Lease Future Minimum Lease Payments [Abstract]
Operating Lease Future Minimum Lease Payments
Noncancelable Operating Leases, 2019
Operating Leases, Future Minimum Payments Due, Next Twelve Months
Noncancelable Operating Leases, 2020
Operating Leases, Future Minimum Payments, Due in Two Years
Noncancelable Operating Leases, 2021
Operating Leases, Future Minimum Payments, Due in Three Years
Noncancelable Operating Leases, 2022
Operating Leases, Future Minimum Payments, Due in Four Years
Noncancelable Operating Leases, 2023
Operating Leases, Future Minimum Payments, Due in Five Years
Noncancelable Operating Leases, Later Years
Operating Leases, Future Minimum Payments, Due Thereafter
Noncancelable Operating Leases Total Future Minimum Lease Payments
Operating Leases, Future Minimum Payments Due
Maximum Potential Loss
Maximum Potential Loss [Abstract]
Maximum potential loss.
Max Potential Loss on Master Lease Agreements
Max Potential Loss on Master Lease Agreements
Maximum potential loss on master lease agreements.
Future Minimum Rentals, Sale Leaseback Transactions
Minimum Lease Payments, Sale Leaseback Transactions, Fiscal Year Maturity [Abstract]
2019
Minimum Lease Payments, Sale Leaseback Transactions, Next Twelve Months
2020
Minimum Lease Payments, Sale Leaseback Transactions, within Two Years
2021
Minimum Lease Payments, Sale Leaseback Transactions, within Three Years
2022
Minimum Lease Payments, Sale Leaseback Transactions, within Four Years
Total Future Minimum Lease Payments
Minimum Lease Payments, Sale Leaseback Transactions
Leases (Textuals)
Leases Textuals [Abstract]
Leases Textuals Abstract.
Sale and Leaseback Transaction, Gain (Loss), Net
Sale and Leaseback Transaction, Gain (Loss), Net
Lease Term
Lease Term
The term of the lease.
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.
Guarantor Obligations, Current Carrying Value
Guarantor Obligations, Current Carrying Value
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.
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.
Segment Reporting [Abstract]
Transmission and Distribution Utilities Revenues [Member]
Transmission and Distribution Utilities Revenues [Member]
Transmission and Distribution Revenues.
Electric Transmission [Member]
Electric Transmission [Member]
Other Revenues [Member]
Other Revenues [Member]
Other Revenues.
Electricity [Member]
Electricity [Member]
Consolidation Items [Axis]
Consolidation Items [Axis]
Consolidation Items [Domain]
Consolidation Items [Domain]
Consolidation, Eliminations [Member]
Consolidation, Eliminations [Member]
Vertically Integrated Utilities [Member]
Vertically Integrated Utilities [Member]
Vertically Integrated Utilities [Member]
Transmission And Distribution Companies [Member]
Transmission And Distribution Companies [Member]
Transmission And Distribution Companies [Member]
AEP Transmission Holdco [Member]
AEP Transmission Holdco [Member]
AEP Transmission Holdco.
Transmission Operations [Member]
Transmission Operations [Member]
Transmission Operations Member.
Other Segments [Member]
Other Segments [Member]
State Transcos [Member]
State Transcos [Member]
State Transcos [Member]
AEPTCo Parent [Member]
AEPTCo Parent [Member]
AEPTCo Parent [Member]
Revenue from Contracts with Customers
Reportable Segment Information
Segment Reporting Information, Profit (Loss) [Abstract]
Sales to AEP Affiliates
Revenue from Related Parties
Investment Income, Interest and Dividend
Investment Income, Interest and Dividend
NET INCOME (LOSS)
Balance Sheet Information
Segment Reporting Information, Additional Information [Abstract]
Total Property, Plant and Equipment
Notes Receivable, Related Parties
Notes Receivable, Related Parties
Total Assets
Leases
Leases of Lessee Disclosure [Text Block]
Corporate and Other [Member]
Consolidation Eliminations [Member]
Retail [Member]
Retail [Member]
Residential [Member]
Residential [Member]
Retail revenues from the residential class.
Commercial [Member]
Commercial [Member]
Retail revenues from the commercial class.
Industrial [Member]
Industrial [Member]
Retail revenues from the industrial class.
Other Retail [Member]
Other Retail [Member]
Revenues from retail classes other than residential, commercial and industrial.
Wholesale and Competitive [Member]
Wholesale and Competitive [Member]
Revenues related to wholesale and competitive sales.
Wholesale Generation [Member]
Wholesale Generation [Member]
Wholesale Generation.
Wholesale Transmission [Member]
Wholesale Transmission [Member]
Wholesale Transmission.
Marketing, Competitive Retail and Renewable [Member]
Marketing, Competitive Retail and Renewable [Member]
Marketing, Competitive Retail and Renewable [Member]
Other Revenues [Member]
Other Revenues - Affiliated and Nonaffiliated [Member]
Other Revenues - Affiliated and Nonaffiliated.
Affiliated and Nonaffiliated [Member]
Affiliated and Nonaffiliated [Member]
Includes affiliated and nonaffiliated revenues.
Alternative and Other [Member]
Alternative and Other [Member]
Alternative and Other [Member]
Alternative [Member]
Alternative [Member]
Alternative [Member]
Recognition Period [Axis]
Recognition Period [Axis]
Recognition Period [Axis]
Recognition Period [Domain]
Recognition Period [Domain]
[Domain] for Recognition Period [Axis]
2019 [Member]
Less Than 1 Year [Member]
Time period in which fixed performance obligations will be satisfied.
2020-2021 [Member]
2-3 Years [Member]
Time period in which fixed performance obligations will be satisfied.
2022-2023 [Member]
4-5 Years [Member]
Time period in which fixed performance obligations will be satisfied.
After 2023 [Member]
After 5 Years [Member]
Time period in which fixed performance obligations will be satisfied.
Contract with Customer, Duration [Axis]
Contract with Customer, Duration [Axis]
Contract with Customer, Duration [Domain]
Contract with Customer, Duration [Domain]
Short-term Contract with Customer [Member]
Short-term Contract with Customer [Member]
Disaggregation of Revenue
Disaggregation of Revenue [Abstract]
Total Revenues
Revenue, Performance Obligation
Revenue, Performance Obligation [Abstract]
Fixed Performance Obligations
Revenue, Remaining Performance Obligation, Amount
Affiliated Companies - Contracts with Customers
Revenue Textuals
Revenue Textuals [Abstract]
Revenue Textuals Abstract.
Revenue from Related Parties
Impairment, Disposition and Assets and Liabilities Held for Sale
Asset Impairment Charges [Text Block]
Long-term Debt
Schedule of Debt [Table Text Block]
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.
Retirements and Principal Payments
Schedule of Extinguishment of Debt [Table Text Block]
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.
Nonutility Money Pool Activity [Table Text Block]
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.
Direct Borrowing Activity [Table Text Block]
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.
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.
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.
Maximum Minimum Average Interest Rates for Funds Borrowed from Loaned to Nonutility Money Pool [Text Block]
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.
Maximum Minimum and Average Interest Rates for Funds Borrowed from and Loaned to AEP [Table Text Block]
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.
Short Term Debt
Schedule of Short-term Debt [Table Text Block]
Comparative Accounts Receivable Information
Comparative Accounts Receivable Information [Text block]
Comparative accounts receivable information.
Customer Accounts Receivable Managed Portfolio
Customer Accounts Receivable Managed Portfolio [Text Block]
Customer accounts receivable managed portfolio.
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.
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.
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.
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Pronouncements
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
Business Segments
Segment Reporting Disclosure [Text Block]
Commitments, Guarantees and Contingencies
Commitments Contingencies and Guarantees [Text Block]
Consolidated Entities [Axis]
Consolidated Entities [Axis]
Consolidated Entities [Domain]
Consolidated Entities [Domain]
AEP Subsidiaries [Member]
Subsidiaries [Member]
Variable Interest Entities [Axis]
Variable Interest Entities [Axis]
Variable Interest Entity, Classification [Domain]
Variable Interest Entity, Classification [Domain]
AEP Texas Central Transition Funding Co [Member]
AEP Texas Central Transition Funding Co [Member]
AEP Texas Central Transition Funding Company Variable Interest Entity Member
Ohio Phase-In-Recovery Funding [Member]
Ohio Phase-In-Recovery Funding [Member]
Ohio Phase-In-Recovery Funding Variable Interest Entity Member
DCC Fuel [Member]
DCC Fuel [Member]
DCC Fuel Variable Interest Entity Member
Assets, Noncurrent [Abstract]
Accrued Interest
Common Stock, No Par Value
Common Stock, No Par Value
Common Stock, Par Value Per Share
Common Stock, Par or Stated Value Per Share
Common Stock, Shares Authorized
Common Stock, Shares Authorized
Common Stock, Shares, Issued
Common Stock, Shares Outstanding
Common Stock, Shares, Outstanding
Treasury Stock, Shares
Treasury Stock, Shares
Vertically Integrated Utilities [Member]
Transmission and Distribution Utilities [Member]
Generation & Marketing [Member]
Transmission Revenues [Member]
Fuel and Other Consumables Used for Electric Generation [Member]
Electricity, Generation [Member]
Revenues
Other Revenues - Affiliated
Related Party Transaction, Other Revenues from Transactions with Related Party
Expenses
Cost of Goods and Services Sold
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.
Other Operation
Utilities Operating Expense, Operations
Maintenance
Utilities Operating Expense, Maintenance
Taxes Other Than Income Taxes
Taxes, Miscellaneous
Other Income (Expense):
Interest Income
Carrying Costs Income
Other Income
Other Nonoperating Income (Expense)
Non-Service Cost Components of Net Periodic Benefit Cost
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component
Interest Expense
Income Tax Expense (Benefit)
Equity Earnings (Loss) of Unconsolidated Subsidiaries
Income (Loss) from Equity Method Investments
Earnings Per Share
Reportable Segment Information
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Income Taxes
Income Tax Disclosure [Text Block]