Cover [Abstract]
Entities [Table]
Entities [Table]
Entity Listings, Exchange [Axis]
Entity Listings, Exchange [Axis]
Exchange [Domain]
Exchange [Domain]
New York Stock Exchange
NEW YORK STOCK EXCHANGE, INC. [Member]
Legal Entity [Axis]
Legal Entity [Axis]
Entity [Domain]
Entity [Domain]
AEP Texas Inc. [Member]
AEP Texas Inc. [Member]
AEP Texas Inc.
AEP Transmission Co [Member]
AEP Transmission Co [Member]
AEP Transmission Company, LLC.
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
Equity Components [Axis]
Equity Components [Axis]
Equity Component [Domain]
Equity Component [Domain]
Common Stock [Member]
Common Stock [Member]
Preferred Stock [Member]
Preferred Stock [Member]
Entity Information [Line Items]
Entity Information [Line Items]
Document Type
Document Type
Document Quarterly Report
Document Quarterly Report
Document Period End Date
Document Period End Date
Document Transition Report
Document Transition Report
Entity File Number
Entity File Number
Entity Registrant Name
Entity Registrant Name
Entity Incorporation, State or Country Code
Entity Incorporation, State or Country Code
Entity Tax Identification Number
Entity Tax Identification Number
Entity Address, Address Line One
Entity Address, Address Line One
Entity Address, City or Town
Entity Address, City or Town
Entity Address, State or Province
Entity Address, State or Province
Entity Address, Postal Zip Code
Entity Address, Postal Zip Code
City Area Code
City Area Code
Local Phone Number
Local Phone Number
Title of 12(b) Security
Title of 12(b) Security
Trading Symbol
Trading Symbol
Security Exchange Name
Security Exchange Name
Entity Current Reporting Status
Entity Current Reporting Status
Entity Interactive Data Current
Entity Interactive Data Current
Entity Filer Category
Entity Filer Category
Entity Small Business
Entity Small Business
Entity Emerging Growth Company
Entity Emerging Growth Company
Entity Shell Company
Entity Shell Company
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Entity Central Index Key
Entity Central Index Key
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
Accounting Policies [Abstract]
Statement [Table]
Statement [Table]
Statement [Line Items]
Statement [Line Items]
Significant Accounting Matters
Significant Accounting Policies [Text Block]
Fair Value Disclosures [Abstract]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Domain]
Long-term Debt, Type [Domain]
Equity Units [Member]
Equity units [Member]
Equity units issued by AEP in March 2019
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.
Schedule of Trading Securities and Other Trading Assets, Major Types of Trading Securities and Assets [Axis]
Financial Instrument [Axis]
Major Types of Trading Securities and Assets [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
Domestic [Member]
Domestic [Member]
Domestic Member.
Mutual Funds Equity [Member]
Mutual Fund [Member]
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]
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.
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Domain]
Fair Value Hierarchy and NAV [Domain]
Unrealized Gain on Securities
Unrealized Gain on Securities
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
Other Short-term Investments
Other Short-term Investments
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
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.
Gross Unrealized Gains
Available-for-sale Securities, Gross Unrealized Gain
Other-Than-Temporary Impairments
Other than Temporary Impairment Losses, Investments, Available-for-sale 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 Gain (Loss)
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
Unrealized Loss on Securities
Unrealized Loss on Securities
Revenue from Contracts with Customers [Abstract]
Revenue from Contracts with Customers [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
Affiliated Accounts Receivable Contracts with Customers [Table Text Block]
Tabular disclosure of affiliated accounts receivable contracts with customers.
Regulated Operations [Abstract]
Public Utilities General Disclosures [Table]
Public Utilities General Disclosures [Table]
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]
Public Utility [Axis]
Public Utility [Axis]
Utility Plant [Domain]
Utility Plant [Domain]
Oklaunion Generating Station [Member]
Oklaunion Generating Station (Unit No. 1) [Member]
Oklaunion Generating Station (Unit No. 1) Member
Dolet Hills Power Station [Member]
Dolet Hills Generating Station (Unit No. 1) [Member]
Dolet Hills Generating Station (Unit No. 1) Member
Plant Retirement Costs - Unrecovered Plant [Member]
Plant Retirement Costs - Unrecovered Plant [Member]
Plant Retirement Costs - Unrecovered Plant [Member]
Plant Retirement Costs - Unrecovered Plant, Louisiana [Member]
Plant Retirement Costs - Unrecovered Plant, Louisiana [Member]
Plant Retirement Costs - Unrecovered Plant, Louisiana.
Oklaunion Power Station Accelerated Depreciation [Member]
Oklaunion Power Station Accelerated Depreciation [Member]
Oklaunion Power Station Accelerated Depreciation [Member]
Kentucky Deferred Purchase Power Expenses [Member]
Kentucky Deferred Purchase Power Expenses [Member]
Kentucky Deferred Purchase Power Expenses [Member]
Dolet Hills Power Station Accelerated Depreciation [Member]
Dolet Hills Power Station Accelerated Depreciation [Member]
Dolet Hills Power Station Accelerated Depreciation [Member]
Plant Retirement Costs - Asset Retirement Obligation Costs [Member]
Asset Retirement Obligation Related to Retired Plants [Member]
Asset Retirement Obligation Related to Retired Plants [Member]
Asset Retirement Obligation [Member]
Asset Retirement Obligation [Member]
Asset retirement obligation shown on the balance sheet
Asset Retirement Obligation - Louisiana [Member]
Asset Retirement Obligation - Louisiana [Member]
Asset Retirement Obligation - Louisiana [Member]
Storm-Related Costs [Member]
Storm Costs [Member]
Vegetation Management Program [Member]
Vegetation Management [Member]
Vegetation Management Member.
Cook Plant Study Costs [Member]
Cook Plant Study Costs [Member]
Cook Plant Study Costs.
Other Regulatory Assets Not Yet Being Recovered [Member]
Other Regulatory Assets Not Yet Being Recovered [Member]
Other Regulatory Assets Not Yet Being Recovered
Virginia Jurisdictional AMR Meters [Member]
Virginia Jurisdictional AMR Meters [Member]
Virginia Jurisdictional AMR Meters [Member]
Plant Retirement Costs - Materials and Supplies [Member]
Materials and Supplies Related to Retired Plants [Member]
Materials and Supplies Related to Retired Plants [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]
Base Rate [Axis]
Base Rate [Axis]
Base Rate Axis.
Base Rate [Domain]
Base Rate [Domain]
Base Rate Domain.
2019 Texas Base Rate Case [Member]
2019 Texas Base Rate Case [Member]
2019 Texas Base Rate Case [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, General Disclosures [Line Items]
Gross Investment
Public Utilities, Property, Plant and Equipment, Generation or Processing
Accumulated Depreciation
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Net Investment
Property, Plant and Equipment, Net
Accelerated Depreciation Regulatory Asset
Accelerated Depreciation
The amount of accelerated depreciation as a regulatory asset for plants to be retired.
Materials and Supplies
Other Inventory, Supplies, Gross
Cost of Removal Regulatory Liability
Cost of Removal Regulatory Liability
The regulatory liability recorded for cost of removal.
Expected Retirement Date
Disposal Group, Including Discontinued Operation, Description and Timing of Disposal
Remaining Recovery Period
Remaining Recovery Period, Plant Depreciation
The remaining amortization period for recovery of the plant depreciation.
Percent of Fuel Supply Provided by DHLC
Percent of Fuel Supply Provided by DHLC
The percentage of fuel supply provided by DHLC to Dolet Hills Power Station.
Asset Retirement Obligation, Revision of Estimate
Asset Retirement Obligation, Revision of Estimate
Share of Net Investment in Dolet Hills Power Station
Share of Net Investment in Dolet Hills Power Station
SWEPCo's share of the net investment in Dolet Hills Power Station.
Dolet Hills Lignite Company Unbilled Fixed Costs
Dolet Hills Lignite Company Unbilled Fixed Costs
Dolet Hills Lignite Company unbilled fixed costs that will be billed to SWEPCo prior to closure.
Oxbow Unbilled Fixed Costs
Oxbow Unbilled Fixed Costs
Oxbow unbilled fixed costs that will be billed to SWEPCo prior to closure.
Regulatory Assets, Noncurrent
Regulatory Assets, Noncurrent
Income Statement [Abstract]
Product and Service [Axis]
Product and Service [Axis]
Product and Service [Domain]
Product and Service [Domain]
Vertically Integrated Utilities [Member]
Electricity [Member]
Transmission and Distribution Utilities [Member]
Transmission and Distribution Utilities Revenues [Member]
Transmission and Distribution Revenues.
Transmission [Member]
Electric Transmission [Member]
Generation and Marketing [Member]
Generation and Marketing Revenues [Member]
Generation and Marketing Revenues.
Other Revenues [Member]
Other Revenues [Member]
Other Revenues.
Fuel and Other Consumables Used for Electric Generation [Member]
Electricity, Generation [Member]
Purchased Electricity for Resale [Member]
Electricity, Purchased [Member]
Revenues
Revenues [Abstract]
Revenue from Contracts with Customers
Revenue from Contract with Customer, Including Assessed Tax
Sales to AEP Affiliates
Revenue from Related Parties
Provision for Refund
Provision for Refund
Provision for Refund
Other Revenues - Affiliated
Related Party Transaction, Other Revenues from Transactions with Related Party
TOTAL REVENUES
Revenues
Expenses
Operating Expenses [Abstract]
Cost of Goods and Services Sold
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.
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).
Other Operation
Utilities Operating Expense, Operations
Maintenance
Utilities Operating Expense, Maintenance
Depreciation and Amortization
Utilities Operating Expense, Depreciation and Amortization
Taxes Other Than Income Taxes
Taxes, Miscellaneous
TOTAL EXPENSES
Operating Expenses
OPERATING INCOME (LOSS)
Operating Income (Loss)
Other Income (Expense):
Other Nonoperating Income (Expense) [Abstract]
Interest Income
Investment Income, Interest and Dividend
Carrying Costs Income
Carrying Costs Income
Income recorded to accrue a return on certain regulatory assets as granted by a regulator.
Other Income
Other Nonoperating Income (Expense)
Allowance for Equity Funds Used During Construction
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity
Non-Service Cost Components of Net Periodic Benefit Cost
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component
Interest Expense
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)
Income Tax Expense (Benefit)
Equity Earnings (Loss) of Unconsolidated Subsidiaries
Income (Loss) from Equity Method Investments
Net Income (Loss)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Net Income (Loss) Attributable to Noncontrolling Interests
Net Income (Loss) Attributable to Noncontrolling Interest
Earnings Attributable to Common Shareholders
Net Income (Loss) Available to Common Stockholders, Basic
Earnings Per Share
Earnings Per Share [Abstract]
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 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
Common Stock, Dividends Per Share, Declared
Common Stock, Dividends, Per Share, Declared
Statement of Comprehensive Income [Abstract]
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
Consolidated Entities [Axis]
Consolidated Entities [Axis]
Consolidated Entities [Domain]
Consolidated Entities [Domain]
AEP Wind Holdings LLC [Member]
AEP Wind Holdings LLC [Member]
AEP Wind Holdings LLC [Member]
Balance Sheet Location [Axis]
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Balance Sheet Location [Domain]
Noncontrolling Interest [Member]
Noncontrolling Interest [Member]
Segments [Axis]
Segments [Axis]
Segments [Domain]
Segments [Domain]
Vertically Integrated Utilities [Member]
Vertically Integrated Utilities [Member]
Vertically Integrated Utilities [Member]
Transmission And Distribution Utilities [Member]
Transmission And Distribution Companies [Member]
Transmission And Distribution Companies [Member]
AEP Transmission Holdco [Member]
AEP Transmission Holdco [Member]
AEP Transmission Holdco.
Generation And Marketing [Member]
Generation And Marketing [Member]
Generation And Marketing [Member]
Other Segments [Member]
Other Segments [Member]
Consolidation Items [Axis]
Consolidation Items [Axis]
Consolidation Items [Domain]
Consolidation Items [Domain]
Consolidation Eliminations [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.
Generation [Member]
Transmission [Member]
Wholesale Transmission [Member]
Wholesale Transmission.
Wholesale Generation [Member]
Wholesale Generation [Member]
Wholesale Generation.
Renewable Generation [Member]
Renewable Generation [Member]
Renewable Generation
Retail, Trading and Marketing Revenues [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 [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]
2020 [Member]
Less Than 1 Year [Member]
Time period in which fixed performance obligations will be satisfied.
2021-2022 [Member]
2-3 Years [Member]
Time period in which fixed performance obligations will be satisfied.
2023-2024 [Member]
4-5 Years [Member]
Time period in which fixed performance obligations will be satisfied.
2024 and Forward [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 [Abstract]
Disaggregation of Revenue [Abstract]
Revenue Not from Contract with Customer, Other
Revenue Not from Contract with Customer, Other
Total Revenues
Revenue, Performance Obligation [Abstract]
Revenue, Performance Obligation [Abstract]
Fixed Performance Obligations
Revenue, Remaining Performance Obligation, Amount
Assets, Current [Abstract]
Assets, Current [Abstract]
Affiliated Companies - Contracts with Customers
Accounts Receivable, Related Parties, Current
Revenue Textuals [Abstract]
Revenue Textuals [Abstract]
Revenue Textuals Abstract.
Revenue from Related Parties
Debt Disclosure [Abstract]
Debt Instrument [Axis]
Debt Instrument [Axis]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Notes Payable, Other Payables [Member]
Notes Payable, Other Payables [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Statistical Measurement [Axis]
Statistical Measurement [Axis]
Statistical Measurement [Domain]
Statistical Measurement [Domain]
Maximum [Member]
Maximum [Member]
Minimum [Member]
Minimum [Member]
Kentucky Power Co [Member]
Kentucky Power Co [Member]
Kentucky Power Company Member
Transource Energy [Member]
Transource Energy [Member]
Transource Energy [Member]
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]
Short-term Debt [Member]
Short-term Debt [Member]
Loans Payable [Member]
Loans Payable [Member]
Notes Payable, Other Payable Two [Member]
Notes Payable, Other Payable Two [Member]
A written promise to pay a note to a third party.
Notes Payable, Other Payable Three [Member]
Notes Payable, Other Payable Three [Member]
A written promise to pay a note to a third party.
Notes Payable, Other Payable Four [Member]
Notes Payable, Other Payable Four [Member]
A written promise to pay a note to a third party.
Notes Payable, Other Payable Five [Member]
Notes Payable, Other Payable Five [Member]
A written promise to pay a note to a third party.
Notes Payable, Other Payables 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
OtherLongTermDebtTwo [Member]
OtherLongTermDebtTwo [Member]
Other Long Term Debt Two [Member]
Securitization Bonds [Member]
Securitization Bonds [Member]
A collateralized debt obligation (backed by pledge, mortgage or other lien on the entity's assets).
Securitization Bonds Two [Member]
Securitization Bonds Two [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.
Senior Unsecured Notes Two [Member]
Senior Unsecured Notes Two [Member]
A senior note is a bond that takes priority over other debt securities sold by the issuer. In the event the issuer goes bankrupt, senior debt holders receive priority for [must receive] repayment [prior] relative to junior and unsecured (general) creditors.
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
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]
Subsequent Event Type [Axis]
Subsequent Event Type [Axis]
Subsequent Event Type [Domain]
Subsequent Event Type [Domain]
Subsequent Event [Member]
Subsequent Event [Member]
Maximum Interest Rate
Maximum Interest Rate
The maximum weighted-average interest rate of funds outstanding at that time, calculated on a daily basis, either borrowed from or loaned to a Money Pool during the period. The Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries.
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.
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 Due Within One Year
Long-term Debt, Current Maturities
Long-term Debt
Long-term Debt, Excluding Current Maturities
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.
Proceeds from Issuance of Debt
Proceeds from Issuance of Debt
Repayments of Long-term Debt
Repayments of Long-term Debt
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.).
Interest Rate (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.
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.
Net Loans (Borrowings) to/from Money Pool
Related Party Transaction, Due from (to) Related Party
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.
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 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.
Short-term Debt:
Short-term Debt [Abstract]
Securitized Debt for Receivables
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount
Commercial Paper
Commercial Paper
Other Short-term Investments
Other Short-term Borrowings
Notes Payable
Notes Payable
Total Short-term Debt
Short-term Debt
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, Sale of Accounts Receivable
Bad Debt Reserves Related to Securitized Sale of Accounts Receivable
A valuation allowance for securitized receivables that are expected to be uncollectible.
Unbilled Receivables Related to Securitization, Sale of Accounts Receivable
Unbilled Receivables Related to Securitization, Sale of Accounts Receivable
The amount of revenue for work performed for which billing has not occurred related to securitization of accounts receivable.
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
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.
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.
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 Issuance 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.
Forward Equity Purchase Contract Date
Forward Equity Purchase Contract Date
Forward Equity Purchase Contract Date
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
AEP Share Price for Equity Unit Conversion
Shares Per Equity Unit
Shares Per Equity Unit
Amount of shares issued per equity unit at maturity
Stockholders' Equity, Other
Stockholders' Equity, Other
Maximum Shares Issued Under Equity Units Conversion
Maximum Shares Issued Under Equity Units Conversion
The maximum shares that can be issued related to AEP's Equity Units
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]
Financing Activities
Debt Disclosure [Text Block]
Comprehensive Income [Abstract]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Financial Instrument [Axis]
Financial Instruments [Domain]
Energy Contracts [Member]
Energy Contracts [Member]
Risk management commodity contracts whose primary underlying risk is tied energy contracts.
Natural Gas Contracts [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]
Interest Rate [Member]
Interest Rate [Member]
Interest Rate 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]
2020 [Member]
Within Current Year [Member]
Maturity of risk management contracts within current year.
2021 - 2023 [Member]
Maturity Period 2 [Member]
2024 - 2025 [Member]
Maturity Period 3 [Member]
2026 - 2032 [Member]
Maturity Period Four [Member]
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]
Low [Member]
High [Member]
Weighted Average [Member]
Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
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
Spent Nuclear Fuel and Decommissioning Trusts
Nuclear Fuel and Decommissioning Trusts [Abstract]
Nuclear Fuel and Decommissioning Trusts Abstract.
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets
Assets, Fair Value Disclosure
Risk Management Assets
Derivative Asset [Abstract]
Risk Management Assets
Derivative Asset
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, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [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), Recurring Basis, Still Held, Unrealized Gain (Loss)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss)
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 Jurisdiction
Changes in Fair Value Allocated to Regulated Jurisdiction
This element represents total gains or losses for the period (realized and unrealized), arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are allocated to regulated jurisdictions.
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 Prior to Cash Collateral, Assets/Liabilities
Maturity Of Net Fair Value Of Risk Management Contracts Prior To Cash Collateral Assets Or Liabilities
Maturity of the net fair value of risk management contracts prior to cash collateral, assets or liabilities.
Statement of Cash Flows [Abstract]
Operating Activities
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net Income (Loss)
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]
Amortization Of Generation Deferrals
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
Allowance for Equity Funds Used During Construction
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.
Recovery of Ohio Capacity Costs, Net
Deferral Of Ohio Capacity Costs
The increase (decrease) during the reporting period in amounts for the net under recovery of capacity deferrals related to the differential between $189/MW-day capacity cost and RPM (reliability pricing model) pricing.
Refund of 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
Acquisitions of Assets
Payments to Acquire Property, Plant, and Equipment
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
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
Proceeds from 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
Issuance of Short-term Debt with Original Maturities greater than 90 Days
Proceeds from Short-term Debt, Maturing in More than Three Months
Change in Short-term Debt with Original Maturities less than 90 Days, 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
Principal Payments for Finance Leases
Finance Lease, Principal Payments
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 and Cash Equivalents, at Carrying Value
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
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability
Construction Expenditures Included in Current Liabilities as of March 31,
Construction in Progress Expenditures Incurred but Not yet Paid
Construction Expenditures Included in Noncurrent Liabilities as of March 31,
Capital 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.
Statement of Financial Position [Abstract]
Current Assets
Cash and Cash Equivalents
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, after Allowance for Credit Loss, Current [Abstract]
Customers
Accounts Receivable, before Allowance for Credit Loss, Current
Affiliated Companies
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
Accounts Receivable, Allowance for Credit Loss, Current
Total Accounts Receivable
Accounts Receivable, after Allowance for Credit Loss, Current
Fuel
Inventory, Raw Materials, 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
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
Construction Work in Progress
Construction in Progress, Gross
Total Property, Plant and Equipment
Property, Plant and Equipment, Gross
Accumulated Depreciation and Amortization
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET
Other Noncurrent Assets
Assets, Noncurrent [Abstract]
Regulatory Assets
Securitized Assets
Securitized Regulatory Transition Assets, Noncurrent
Goodwill
Goodwill
Long-term Risk Management Assets
Derivative Asset, Noncurrent
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.
Operating Lease Assets
Operating Lease, Right-of-Use Asset
Deferred Property Taxes
Deferred Tax Assets, Property, Plant and Equipment
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
Securitized Debt for Receivables - AEP Credit
Other Short-term Debt
Short-term Bank Loans and Notes Payable
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 Operating Leases
Operating Lease, Liability, Current
Provision for Refund
Accumulated Provisions For Rate Refunds
Refunds for costs collected in formula rates.
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]
Affiliated Long Term Debt Noncurrent
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.
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 Reedemable Performance Share Awards
Mezzanine Equity
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
Paid-in Captial
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 MEMBER'S EQUITY
Members' Equity
TOTAL EQUITY
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest
TOTAL LIABILITIES AND EQUITY
Liabilities and Equity
Retirement Benefits [Abstract]
Components of Net Periodic Benefit Cost
Schedule of Net Benefit Costs [Table Text Block]
Comprehensive Income
Comprehensive Income (Loss) Note [Text Block]
Commitments Guarantees and Contingencies [Abstract]
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]
Max Potential Loss on Master Lease Agreements [Table Text Block]
Max Potential Loss on Master Lease Agreements [Table Text Block]
Max potential loss on master lease agreements.
Future Minimum Lease Payments for Sale and Leaseback [Table Text Block]
Future Minimum Lease Payments for Sale and Leaseback [Table Text Block]
Future Minimum Lease Payments for sale-and-leaseback.
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Standards
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
Benefit Plans
Pension and Other Postretirement Benefits Disclosure [Text Block]
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
Amounts Attributable to AEP Common Shareholders
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
Weighted Average Number of Basic AEP Common Shares Outstanding
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
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 Securities Excluded from Computation of Earnings Per Share, Amount
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Cash, Cash Equivalents and Restricted Cash
Cash, Cash Equivalents and Restricted Cash [Abstract]
Cash, Cash Equivalents and Restricted Cash [Abstract]
Total Cash, Cash Equivalents and Restricted Cash
2017-2019 Virginia Triennial Review [Member]
Virginia Legislation Affecting Biennial Reviews [Member]
Virginia Legislation Affecting Biennial Reviews [Member]
2019 Indiana Base Rate Case [Member]
2019 Indiana Base Rate Case [Member]
2019 Indiana Base Rate Case [Member]
Amount of Increase Related to Annual Depreciation Rates
Amount of Increase Related to Annual Depreciation Rates
Amount of increased depreciation expense approved.
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.
Net Book Value of Retired Plants
Net Book Value of Retired Plants
Net Book Value of Retired Plants, before cost of removal, including materials and supplies.
Other Asset Impairment Charges
Other Asset Impairment Charges
Requested Annual Increase
Requested Annual Increase
Requested annual increase.
Requested Return on Equity
Public Utilities, Requested Return on Equity, Percentage
Amount Of Increased Depreciation Expense Requested
Amount Of Increased Depreciation Expense Requested
Amount of increased depreciation expense requested.
Amount of Increase Related to Calculated Shortfall
Amount of Increase Related to Calculated Shortfall
Amount of increase related to calculated shortfall in base rate case.
Property, Plant and Equipment, Net
Amount of Increase Related to Annual Depreciation Rates due to Proposed Investments
Amount of Increase Related to Annual Depreciation Rates due to Proposed Investments
Amount of increased annual depreciation rates due to proposed investments requested.
Amount of Increase Related to Annual Depreciation Rates due to Increased Depreciation Expense
Amount of Increase Related to Annual Depreciation Rates due to Increased Depreciation Expense
Increase related to annual depreciation rates due to increased depreciation expense requested.
Approved Annual Revenue Increase
Approved Annual Revenue Increase
Amount of approved annual revenue increase.
Approved Return on Common Equity
Public Utilities, Approved Return on Equity, Percentage
Initial Phased in Annual Increase
Initial Phased in Annual Increase
Amount of approved annual revenue increase that will be phased in initially.
Impact on Pretax Earnings due to Loss of Significant Contract
Impact on Pretax Earnings due to Loss of Significant Contract
This amount represents the impact on pretax earnings due to the loss of a significant contract.
AEP Subsidiaries [Member]
Subsidiaries [Member]
Variable Interest Entities [Axis]
Variable Interest Entities [Axis]
Variable Interest Entity, Classification [Domain]
Variable Interest Entity, Classification [Domain]
Sabine Mining Co [Member]
Sabine Mining Co [Member]
Sabine Mining Company Variable Interest Entity Member
DCC Fuel [Member]
DCC Fuel [Member]
DCC Fuel Variable Interest Entity Member
AEP Texas Transition Funding and Restoration Funding [Member]
AEP Texas Transition Funding and Restoration Funding [Member]
AEP Texas Transition and Restoration Funding [Member]
Other Inventory, Supplies, Gross
Other Noncurrent Assets
Securitized Transition Assets
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, Issued
Common Stock, Shares Outstanding
Common Stock, Shares, Outstanding
Treasury Stock, Shares
Treasury Stock, Shares
Discontinued Operations and Disposal Groups [Abstract]
Acquisitions and Impairments
Mergers, Acquisitions and Dispositions Disclosures [Text Block]
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal Statutory Rate
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
State Income Tax, net of Federal benefit
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent
Tax Reform Excess ADIT Reversal
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent
Production and Investment Tax Credits
Effective Income Tax Rate Reconciliation production and investment tax credits
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations due to production and investment tax credits.
Flow Through
Effective Income Tax Rate Reconciliation Flow Through Percentage
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations due to Flow Through.
AFUDC Equity
Effective Income Tax Rate Reconciliation AFUDC Equity Percentage
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations due to AFUDC Equity.
Parent Company Loss
Effective Income Tax Rate Reconciliation Parent Company Loss Benefit Percentage
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations due to Parent Company Loss Benefit.
Discrete Tax Adjustments
Effective Income Tax Rate Reconciliation Discrete Tax Adjustments Percentage
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations due to Discrete Tax Adjustments.
Other
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent
Effective Income Tax Rate
Effective Income Tax Rate Reconciliation, Percent
Income Taxes (Textuals) [Abstract]
Income Taxes (Textuals) [Abstract]
Income Taxes.
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax
Income Taxes
Income Tax Disclosure [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 in Nuclear Trusts
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 and Other Investments
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]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging
Derivatives, Policy [Policy Text Block]
Derivatives and Hedging
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Statement of Stockholders' Equity [Abstract]
Statement, Equity Components [Axis]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income [Member]
AOCI Attributable to Parent [Member]
Noncontrolling Interests [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance
Beginning Balance
Beginning Balance, Shares
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
ASU 2016-13 Adoption
Stockholders Equity ASU 2016-13 Adoption
This element represents movements included in the statement of changes in stockholders' equity which are specifically related to the adoption of ASU 2016-13.
Capital Contribution from Member
Adjustments to Additional Paid in Capital, Other
Acquisition
Noncash or Part Noncash Acquisition, Other Assets Acquired
Net Income (Loss)
Net Income (Loss) Attributable to Noncontrolling Interests
Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss), Net of Tax
Ending Balance
Ending Balance
Ending Balance, Shares
Segment Reporting [Abstract]
AEP Transmission Holdco [Member]
Transmission Operations [Member]
Transmission Operations Member.
All Other [Member]
State Transcos [Member]
State Transcos [Member]
State Transcos [Member]
AEPTCo Parent [Member]
AEPTCo Parent [Member]
AEPTCo Parent [Member]
Reconciling Adjustments [Member]
Vertically Integrated Utilities [Member]
Transmission and Distribution Utilities Revenues [Member]
Generation and Marketing Revenues [Member]
Reportable Segment Information
Segment Reporting Information, Profit (Loss) [Abstract]
Interest Expense
Net Income (Loss)
Balance Sheet Information
Segment Reporting Information, Additional Information [Abstract]
Total Property, Plant and Equipment
Notes Receivable, Related Parties
Total Assets
Affiliated Long Term Debt Current
Affiliated Long Term Debt Current
Total of the portions of the affiliated carrying amounts as of the balance sheet date of long-term debt, which may include notes payable, bonds payable, debentures, mortgage loans, and commercial paper, which are scheduled to be repaid within one year or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.
Long-term Debt - Affiliated
Public Utilities, General Disclosures [Abstract]
Regulated Generating Unit Expected to be Retired by 2020
Disposal Groups, Including Discontinued Operations [Table Text Block]
Regulatory Assets Pending Final Regulatory Approval
Schedule of Regulatory Assets [Table Text Block]
Business Segments
Segment Reporting Disclosure [Text Block]
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)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
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]
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Member]
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.
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.
Derivative Instrument [Axis]
Derivative Instrument [Axis]
Derivative Contract [Domain]
Derivative Contract [Domain]
Commodity [Member]
Commodity Contract [Member]
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]
Notional Volume Of Derivative Instruments
Notional Volume Of Derivative Instruments [Abstract]
Notional Volume Of Derivative Instruments Abstract.
Commodity:
Commodity [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
Total Liabilities
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.
Carrying Amount of Hedged Asset (Liability)
Carrying Amount of Hedged Asset (Liability)
Carrying Amount of 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)
Cumulative Fair Value Hedging Adjustment in the Carrying Amount of the Hedged Asset (Liability)
Gain (Loss) on Hedging Instruments
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Gain (Loss) on Fair Value Hedging Instruments
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.
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 [Abstract]
Collateral Triggering Events [Abstract]
Collateral Triggering Events Abstract.
Fair Value Of Derivative Liabilities Subject To Cross Default Provisions
Fair Value Of Derivative Liabilities Subject To Cross Default Provisions
Fair value of derivative liabilities subject to cross-default provisions.
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) [Abstract]
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
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
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)
TOTAL COMPREHENSIVE INCOME (LOSS)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Total Comprehensive Income (Loss) 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
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
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
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
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
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.
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.
Revenue from Contracts with Customers
Revenue from Contract with Customer [Text Block]
Rate Matters
Public Utilities Disclosure [Text Block]
Excess ADIT Amortization not Subject to Normalization Requirements Policy [Abstract]
Excess ADIT Amortization not Subject to Normalization Requirements Policy [Abstract]
Amortization of Excess ADIT Not Subject to Normalization Requirements Policy [Table]
Unprotected Excess ADIT Amortization Policy [Table]
Unprotected Excess ADIT Amortization Policy [Table]
Amortization of Excess ADIT Not Subject to Normalization Requirements [Line Items]
Unprotected Excess ADIT Amortization Policy [Line Items]
[Line Items] for Unprotected Excess ADIT Amortization Policy [Table]
Amortization of Excess ADIT Not Subject to Normalization Requirements Policy [Table Text Block]
Unprotected Excess ADIT Amortization Policy [Table Text Block]
[Table Text Block] for Unprotected Excess ADIT Amortization Policy [Table]
Fair Value Measurements
Fair Value Disclosures [Text Block]
Equity Method Investments [Member]
Equity Method Investments [Member]
Legal Entity [Axis]
Cost of Purchased Power from Affiliate
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
Guarantor Obligations, Current Carrying Value
Guarantor Obligations, Current Carrying Value
Percentage of an Asset Acquired
Percentage of an Asset Acquired
Percentage of an asset acquired when AEP does not purchase the entire asset.
Wind Generation MWs
WindGenerationMWs
Wind Generation (MWs)
Noncash or Part Noncash Acquisition, Value of Assets Acquired
Noncash or Part Noncash Acquisition, Value of Assets Acquired
Acquisition
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
Public Utilities, Property, Plant and Equipment, Net
Public Utilities, Property, Plant and Equipment, Net
Utilities Operating Expense, Operations
Guarantor Obligations, Current Carrying Value, Contingent Portion
Guarantor Obligations, Current Carrying Value, Contingent Portion
The contingent portion of the current carrying amount of the liability for the freestanding or embedded guarantee or each group of similar guarantees.
Maturity of Credit Facility [Axis]
Maturity of Credit Facility [Axis]
Maturity of Credit Facility
maturityofcreditfacility [Domain]
maturityofcreditfacility [Domain]
[Domain] for maturityofcreditfacility [Axis]
June 2022 [Member]
June 2022 [Member]
June 2022
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.
Major Property Class [Axis]
Major Property Class [Axis]
Major Property Class [Domain]
Major Property Class [Domain]
Rockport Lease [Member]
Rockport Lease [Member]
Lease Type One.
Boat and Barge Leases [Member]
Boat and Barge Leases [Member]
Boat and Barge Leases [Member]
Maximum Future Payments for Letters of Credit [Abstract]
Maximum Future Payments for Letters of Credit [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.
Maximum Potential Loss [Abstract]
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.
Present Value of Future Minimum Lease Payments, Sale Leaseback Transactions, Fiscal Year Maturity [Abstract]
Present Value of Future Minimum Lease Payments, Sale Leaseback Transactions, Fiscal Year Maturity [Abstract]
Minimum Lease Payments, Sale Leaseback Transactions, Next Twelve Months
Minimum Lease Payments, Sale Leaseback Transactions, Next Twelve Months
Minimum Lease Payments, Sale Leaseback Transactions, within Two Years
Minimum Lease Payments, Sale Leaseback Transactions, within Two Years
Minimum Lease Payments, Sale Leaseback Transactions, within Three Years
Minimum Lease Payments, Sale Leaseback Transactions, within Three Years
Minimum Lease Payments, Sale Leaseback Transactions
Minimum Lease Payments, Sale Leaseback Transactions
Commitments, Guarantees and Contingencies (Textuals) [Abstract]
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.
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.
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.
Payments for Environmental Liabilities
Payments for Environmental Liabilities
Refund Item [Axis]
Refund Item [Axis]
Refund Item [Axis]
Refund Item [Domain]
Refund Item [Domain]
[Domain] for Refund Item [Axis]
Excess ADIT and Excess Federal Income Taxes to Distribution Customers [Member]
Excess ADIT and Excess Federal Income Taxes to Distribution Customers [Member]
Excess ADIT and Excess Federal Income Taxes to Distribution Customers [Member]
Excess ADIT and Excess Federal Income Taxes to Transmission Customers [Member]
Excess ADIT and Excess Federal Income Taxes to Transmission Customers [Member]
Excess ADIT and Excess Federal Income Taxes to Transmission Customers [Member]
Previously Collected Rates Subject to Reconciliation [Member]
Previously Collected Rates Subject to Reconciliation [Member]
Previously Collected Rates Subject to Reconciliation [Member]
Approved Item [Axis]
Approved Item [Axis]
Approved Item [Axis]
Approved Item [Domain]
Approved Item [Domain]
[Domain] for Approved Item [Axis]
Capitalized Vegetation Management Expenses [Member]
ETT Interim Transmission Rates [Member]
ETT Interim Transmission Rates [Member]
ETT Interim Transmission Rates [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]
Turk Generating Plant [Member]
Turk Generating Plant [Member]
Turk Generating Plant Member
Disallowance Item [Axis]
Disallowance Item [Axis]
Disallowance Item [Axis]
Disallowance Item [Domain]
Disallowance Item [Domain]
[Domain] for Disallowance Item [Axis]
Capital Investments [Member]
Capital Investments [Member]
Capital Investments [Member]
Rate Case Expense [Member]
Rate Case Expense [Member]
Rate Case Expense.
Amount of 2019 Investments [Member]
Amount of 2019 Investments [Member]
Amount of 2019 Investments [Member]
Requested Return on Equity
Requested Return on Equity
Requested return on equity.
Refund for Excess ADIT
Refund for Excess ADIT
Amount of refund to be given through rate reductions, riders, etc related to Excess ADIT.
Approved Annual Revenue Decrease
Approved Annual Revenue Decrease
Amount of approved annual revenue decrease.
Item to be Refunded in Commission Order
Item to be Refunded in Commission Order
An item to be refunded in commission order.
Write-off of Regulatory Expense
Write-off of Regulatory Expense
Write-off of regulatory expense due to a disallowance.
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.
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.
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
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
Public Utilities, Approved Debt Capital Structure, Percentage
Public Utilities, Approved Debt Capital Structure, Percentage
Public Utilities, Approved Equity Capital Structure, Percentage
Public Utilities, Approved Equity Capital Structure, Percentage
Approved Item in Commission Order
Approved Item in Commission Order
An item that is approved in a commission order.
Disallowed Item in Commission Order
Disallowed Item in Commission Order
An item that is disallowed in a commission order.
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 various factors such as true up of historical information.
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.
Additional Refund for Current Year Tax Reform Rate Change
Additional Refund for Current Year Tax Reform Rate Change
Additional refund for current year tax reform rate change as recommended by staff.
Staff Recommended Annual Rate Increase
Staff Recommended Annual Rate Increase
The staff's recommended annual rate increase.
Commitments, Guarantees and Contingencies
Commitments Contingencies and Guarantees [Text Block]
Schedule of Effective Income Tax Rate Reconciliation
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Basic and Diluted EPS Calculations
Earnings Per Share [Text Block]
Supplementary Information
Supplementary Information [Text Block]
Supplementary Information.
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 the Condensed Balance Sheet
Impact of Fair Value Hedges on Balance Sheet [Table Text Block]
Impact of Fair Value Hedges on Condensed Balance Sheet [Table Text Block]
Gain (Loss) on Hedging Instruments
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.
Schedule of Segment Reporting Information, by Segment [Table]
Schedule of Segment Reporting Information, by Segment [Table]
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
Reportable Segment Information
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Apple Blossom and Black Oak [Member]
Apple Blossom and Black Oak [Member]
Apple Blossom and Black Oak
Reclassifications from Accumulated Other Comprehensive Income [Member]
Cash Flow Hedges [Member]
Pension and OPEB [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
Generation & Marketing Revenues
Purchased Electricity for Resale
Interest Rate
Interest Rate [Abstract]
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
Reclassification from AOCI, before Income Tax (Expense) Benefit
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax
Income Tax (Expense) Benefit
Reclassification 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