Statement of Comprehensive Income [Abstract]
Statement [Table]
Statement [Table]
Legal Entity [Axis]
Legal Entity [Axis]
Entity [Domain]
Entity [Domain]
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
Statement [Line Items]
Statement [Line Items]
Cash Flow Hedges, Tax
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax
Securities Available for Sale, Tax
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax
Amortization of Pension and OPEB Deferred Costs, Tax
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax
Fair Value Disclosures [Abstract]
Contractual Maturities Year [Axis]
Contractual Maturities Year [Axis]
Contractual Maturities Year Axis.
Contractual Maturities Year [Domain]
Contractual Maturities Year [Domain]
Contractual Maturities Year Domain.
Within One Year [Member]
Within One Year [Member]
Within One Year Member.
One Year To Five Year [Member]
One Year To Five Year [Member]
One Year To Five Year Member.
Five Year To Ten Year [Member]
Five Year To Ten Year [Member]
Five Year To Ten Year Member.
After Ten Year [Member]
After Ten Year [Member]
After Ten Year Member.
Schedule of Trading Securities and Other Trading Assets, Major Types of Trading Securities and Assets [Axis]
Major Types of Debt and Equity Securities [Axis]
Major Types of Trading Securities and Assets [Domain]
Major Types of Debt and Equity Securities [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 Funds Equity [Member]
Mutual Funds Equity
Cash and Cash Equivalents [Member]
Cash and Cash Equivalents [Member]
US Government Agencies Debt Securities [Member]
US Government Agencies Debt Securities [Member]
Corporate Debt [Member]
Corporate Debt Securities [Member]
State and Local Jurisdiction [Member]
State and Local Jurisdiction [Member]
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
Estimated Fair Value
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
Gross Unrealized Gains
Gross Unrealized Gains.
Other-Than-Temporary Impairments
Temporary Impairments
Temporary Impairments.
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 Investment Sales
Proceeds From Investment Sales.
Purchases of Investments
Purchases Of Investments
Purchases of Investments.
Gross Realized Gains on Investment Sales
Gross Realized Gains on Investment Sales
Gross Realized Gains on Investment Sales.
Gross Realized Losses on Investment Sales
Gross Realized Losses On Investment Sales
Gross Realized Losses on Investment Sales.
Contractual Maturities, Fair Value of Debt Securities
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Contractual Maturities, Fair Value of Debt Securities
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
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Income Tax Disclosure [Abstract]
Income Taxes
Income Tax Disclosure [Text Block]
Valuation Allowance
Deferred Tax Assets, Valuation Allowance
Income Taxes (Textuals) [Abstract]
Income Taxes (Textuals) [Abstract]
Income Taxes.
Transmission and Distribution Expenses Net Income Adjustment
Transmission and Distribution Expenses Net Income Adjustment
Adjustment to net income for transmission and distribution expenses included in computation of cost of goods sold deduction. This is a result of clarifying guidance regarding the treatment of transmission and distribution expenses included in the computation of taxable income for purposes of calculating the Texas gross margins tax issued by the Texas Comptroller of Public Accounts.
Comprehensive Income [Abstract]
Reclassification out of Accumulated Other Comprehensive Income [Axis]
Reclassification out of Accumulated Other Comprehensive Income [Axis]
Reclassification out of Accumulated Other Comprehensive Income [Domain]
Reclassification out of Accumulated Other Comprehensive Income [Domain]
Reclassifications from Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Member]
Derivative Instrument [Axis]
Derivative Instrument [Axis]
Derivative Contract [Domain]
Derivative Contract [Domain]
Commodity [Member]
Commodity Contract [Member]
Interest Rate and Foreign Currency [Member]
Interest Rate and Foreign Currency [Member]
Interest Rate and Foreign Currency Member.
Equity Components [Axis]
Equity Components [Axis]
Equity Component [Domain]
Equity Component [Domain]
Cash Flow Hedges [Member]
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Securities Available for Sale [Member]
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Pension and OPEB [Member]
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Changes In Accumulated Other Comprehensive Income by Component [Abstract]
Beginning Balance in AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax
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 [Abstract]
Reclassifications From Accumulated Other Comprehensive Income [Abstract]
Generation & Marketing Revenues
Other Revenue, Net
Purchased Electricity for Resale
Cost of Purchased Power
Interest Expense
Interest Expense
Amortization of Prior Service Cost (Credit)
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax
Amortization of Actuarial (Gains)/Losses
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax
Reclassifications from AOCI, before Income Tax (Expense) Credit
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax
Income Tax (Expense) Credit
Income Tax Expense (Benefit)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax
Net Current Period Other Comprehensive Income
Other Comprehensive Income (Loss), Net of Tax
Pension and OPEB Adjustment Related to Mitchell Plant
Pension and OPEB Adjustment Related to Mitchell Plant
Kentucky Power Company employees operate Mitchell Plant and 50% of Pension and OPEB is related to Nonregulated Generation.
Ending Balance in AOCI
Major Types of Debt and Equity Securities [Axis]
Major Types of Debt and Equity Securities [Domain]
Hedging Relationship [Axis]
Hedging Relationship [Axis]
Hedging Relationship [Domain]
Hedging Relationship [Domain]
Risk Management Commodity Contracts [Member]
Risk Management Commodity Contracts [Member]
Risk Management Contracts Member.
Energy Contracts [Member]
Energy Contracts [Member]
Risk management commodity contracts whose primary underlying risk is tied energy contracts.
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 Foreign Currency Hedges [Member]
Interest Rate Foreign Currency Hedges [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]
2016 [Member]
Within Current Year [Member]
Maturity of risk management contracts within current year.
2017 - 2019 [Member]
Maturity Period 2 [Member]
2020 - 2021 [Member]
Maturity Period 3 [Member]
2022 - 2032 [Member]
Maturity Period 5 [Member]
Fair Value, Hierarchy [Axis]
Fair Value, Hierarchy [Axis]
Fair Value Hierarchy [Domain]
Fair Value Hierarchy [Domain]
Level 1 [Member]
Fair Value, Inputs, Level 1 [Member]
Level 2 [Member]
Fair Value, Inputs, Level 2 [Member]
Level 3 [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs Other [Member]
Fair Value Inputs Other [Member]
Fair Value Inputs Other Member.
Range [Axis]
Range [Axis]
Range [Domain]
Range [Domain]
Low [Member]
Minimum [Member]
High [Member]
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents
Cash and Cash Equivalents, Fair Value Disclosure
Other Temporary Investments
Risk Management Assets
Derivative Asset [Abstract]
Risk Management Assets
Derivative Asset
Spent Nuclear Fuel and Decommissioning Trusts
Nuclear Fuel and Decommissioning Trusts [Abstract]
Nuclear Fuel and Decommissioning Trusts Abstract.
Spent Nuclear Fuel and Decommissioning Trusts
Total Assets
Assets, Fair Value Disclosure
Liabilities, Fair Value Disclosure
Liabilities, Fair Value Disclosure [Abstract]
Risk Management Liabilities
Derivative Liability
Changes in the Fair Value of Net Trading Derivatives and other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, 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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)
Purchases, Issuances and Settlements
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements)
Transfers into Level 3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3
Transfers out of Level 3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3
Changes in Fair Value Allocated to Regulated Jurisdictions
Changes in Fair Value Allocated to Regulated Jurisdiction
This element represents total gains or losses for the period (realized and unrealized), arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are allocated to regulated jurisdictions.
Ending Balance
Level 3 Quantitative Information
Fair Value Inputs, Quantitative Information [Abstract]
Forward Price Range Low
Low Market Price
Low market price for unobservable inputs.
Forward Price Range High
High Market Price
High market price for unobservable inputs.
Counterparty Credit Risk
Fair Value Inputs, Counterparty Credit Risk
Weighted Average Market Price
Weighted Average Market Price
Weighted average market price for unobservable inputs.
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.
Discontinued Operations and Disposal Groups [Abstract]
Dispositions
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]
Statement of Stockholders' Equity [Abstract]
Equity Components [Axis]
Common Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
AOCI Attributable to Parent [Member]
Noncontrolling Interests [Member]
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest
Beginning Balance, Shares
Common Stock, Shares, Issued
Issuance of Common Stock, Value
Stock Issued During Period, Value, New Issues
Issuance of Common Stock, Shares
Stock Issued During Period, Shares, New Issues
Common Stock Dividends
Dividends, Common Stock
Common Stock Dividends
Affiliated Dividends Common Stock
Equity impact of aggregate cash, stock, and paid-in-kind dividends declared to an entity that is affiliated with the reporting entity by means of direct or indirect ownership.
Common Stock Dividends
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders
Other Changes in Equity
Stockholders' Equity, Other
Deferred State Income Tax Rate Adjustment
Deferred State Income Tax Rate Adjustment
Changes in deferred state income taxes related to corporate separation
Net Income (Loss)
Net Income (Loss) Attributable to Parent
Net Income Attributable to Noncontrolling Interests
Net Income (Loss) Attributable to Noncontrolling Interest
Net Income (Loss)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Other Comprehensive Income (Loss)
Ending Balance
Ending Balance, Shares
Accounting Policies [Abstract]
Basic and Diluted EPS Calculations
Earnings Per Share [Text Block]
Statement of Financial Position [Abstract]
Current Assets
Assets, Current [Abstract]
Cash and Cash Equivalents
Cash and Cash Equivalents, at Carrying Value
Restricted Cash for Securitized Funding
Restricted Cash and Cash Equivalents, Current
Advances to Affiliates
Due from Related Parties, Current
Accounts Receivable:
Accounts Receivable, Net, Current [Abstract]
Customers
Accounts Receivable Customers
Amounts due from customers for billed utility services.
Affiliated Companies
Accounts Receivable, Related Parties, Current
Accrued Unbilled Revenues
Unbilled Receivables, Current
Pledged Accounts Receivable - AEP Credit
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount
Miscellaneous
Other Receivables
Allowance for Uncollectible Accounts
Allowance for Doubtful Accounts Receivable, Current
Total Accounts Receivable
Accounts Receivable, Net, Current
Fuel
Inventory, Raw Materials, Gross
Materials and Supplies
Other Inventory, Supplies, Gross
Risk Management Assets
Derivative Asset, Current
Risk Management Assets, Affiliated
Affiliated Derivative Assets, Current
Fair value, after the effects of master netting arrangements, of an affiliated financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes affiliated assets not subject to a master netting arrangement and not elected to be offset.
Accrued Tax Benefits
Income Taxes Receivable, Current
Regulatory Asset for Under-Recovered Fuel Costs
Regulatory Assets, Current
Margin Deposits
Margin Deposit Assets
Prepayments and Other Current Assets
Prepaid Expense and Other Assets, Current
TOTAL CURRENT ASSETS
Assets, Current
Property, Plant and Equipment
Property, Plant and Equipment, Gross [Abstract]
Generation
Public Utilities, Property, Plant and Equipment, Generation or Processing
Transmission
Public Utilities, Property, Plant and Equipment, Transmission
Distribution
Public Utilities, Property, Plant and Equipment, Distribution
Other Property, Plant and Equipment
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment
Construction Work in Progress
Construction in Progress, Gross
Total Property, Plant and Equipment
Property, Plant and Equipment, Gross
Accumulated Depreciation and Amortization
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET
Property, Plant and Equipment, Net
Other Noncurrent Assets
Assets, Noncurrent [Abstract]
Notes Receivable - Affiliated
Affiliated Long Term Accounts Notes And Loans Receivable Net Noncurrent
The aggregate of amounts due from affiliates more than one year from the balance sheet date, for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money at a future date more than one year from the balance sheet date, reduced to their estimated net realizable fair value by an allowance established by the Company of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively.
Regulatory Assets
Regulatory Assets, Noncurrent
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.
Deferred Charges and Other Noncurrent Assets
Other Assets, Noncurrent
TOTAL OTHER NONCURRENT ASSETS
Assets, Noncurrent
TOTAL ASSETS
Assets
Current Liabilities
Liabilities, Current [Abstract]
Advances from Affiliates
Due to Related Parties, Current
Accounts Payable
Accounts Payable, Current
Affiliated Companies
Accounts Payable, Related Parties, Current
Short-term Debt:
Short-term Debt [Abstract]
Securitized Debt for Receivables - AEP Credit
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount
Other Short-term Debt
Short-term Bank Loans and Notes Payable
Total Short-term Debt
Short-term Debt
Long-term Debt Due Within One Year
Long-term Debt, Current Maturities
Long-term Debt Due Within One Year - Affiliated
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.
Risk Management Liabilities
Derivative Liability, Current
Customer Deposits
Customer Deposits, Current
Accrued Taxes
Taxes Payable, Current
Accrued Interest
Interest Payable, Current
Obligations Under Capital Leases
Capital Lease Obligations, Current
Regulatory Liability for Over-Recovered Fuel Costs
Regulatory Liability, Current
Other Current Liabilities
Other Liabilities, Current
TOTAL CURRENT LIABILITIES
Liabilities, Current
Noncurrent Liabilities
Liabilities, Noncurrent [Abstract]
Long-term Debt
Long-term Debt, Excluding Current Maturities
Long-term Debt - Affiliated
Affiliated Long Term Debt Noncurrent
Sum of the affiliated carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.
Long-term Risk Management Liabilities
Derivative Liability, Noncurrent
Deferred Income Taxes
Deferred Tax Liabilities, Net, Noncurrent
Regulatory Liabilities and Deferred Investment Tax Credits
Regulatory Liability, Noncurrent
Asset Retirement Obligations
Asset Retirement Obligations, Noncurrent
Employee Benefits and Pension Obligations
Employee Benefits and Pension Obligations
Element represents the noncurrent liability recognized on the balance sheet that is associated with employee benefit and pension obligations including, but not limited to, defined benefit pension plans, other postretirement defined benefit plans, deferred incentive compensation and other postemployment benefits.
Obligations Under Capital Leases
Capital Lease Obligations, 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
Equity
Stockholders' Equity Attributable to Parent [Abstract]
Common Stock
Common Stock, Value, Issued
Paid-in Capital
Additional Paid in Capital
Retained Earnings
Retained Earnings (Accumulated Deficit)
Accumulated Other Comprehensive Income (Loss)
TOTAL COMMON SHAREHOLDER'S EQUITY
Stockholders' Equity Attributable to Parent
Noncontrolling Interests
Stockholders' Equity Attributable to Noncontrolling Interest
TOTAL EQUITY
TOTAL LIABILITIES AND EQUITY
Liabilities and Equity
Compensation and Retirement Disclosure [Abstract]
Benefit Plans
Pension and Other Postretirement Benefits Disclosure [Text Block]
Regulated Operations [Abstract]
Public Utilities General Disclosures [Table]
Public Utilities General Disclosures [Table]
Minimum [Member]
Maximum [Member]
Subsequent Event Type [Axis]
Subsequent Event Type [Axis]
Subsequent Event Type [Domain]
Subsequent Event Type [Domain]
Subsequent Event [Member]
Subsequent Event [Member]
Noncurrent Regulatory Assets [Axis]
Noncurrent Regulatory Assets [Axis]
Noncurrent Regulatory Assets Axis
Regulatory Assets [Domain]
Regulatory Assets [Domain]
Regulatory Assets Domain
Deferred Capacity Costs [Member]
Deferred Capacity Costs [Member]
Deferred capacity costs.
Storm Related Costs [Member]
Storm Costs [Member]
Base Rate [Axis]
Base Rate [Axis]
Base Rate Axis.
Base Rate [Domain]
Base Rate [Domain]
Base Rate Domain.
Kingsport Base Rate Case - 2015 [Member]
Kingsport 2015 Base Rate Case [Member]
Kingsport 2015 Base Rate Case [Member]
Ohio Electric Security Plan Filing [Member]
Ohio Electric Security Plan Filing [Member]
Ohio Electric Security Plan Filing
Ohio Fuel Adjustment Clause Audit - 2009 [Member]
Ohio Fuel Adjustment Clause Audit - 2009 [Member]
2009 Ohio Fuel Adjustment Clause Audit
Special Rate Mechanism For Ormet [Member]
Special Rate Mechanism For Ormet [Member]
Special rate mechanism for Ormet.
Virginia Regulatory Asset Proceeding - 2015 [Member]
Virginia Regulatory Asset Proceeding - 2015 [Member]
Virginia Regulatory Asset Proceeding - 2015 [Member]
West Virginia Deferred Base Rate Increase [Member]
West Virginia Deferred Base Rate Increase [Member]
West Virginia Deferred Base Rate Increase [Member]
West Virginia Expanded Net Energy Charge (ENEC) - 2016 [Member]
West Virginia Expanded Net Energy Charge [Member]
West Virginia Expanded Net Energy Charge [Member]
PJM Planning Year [Axis]
PJM Planning Year [Axis]
PJM Planning Year [Axis]
PJM Planning Year [Domain]
PJM Planning Year [Domain]
[Domain] for PJM Planning Year [Axis]
June 2020 through May 2021 [Member]
June 2020 through May 2021 [Member]
June 2020 through May 2021 [Member]
June 2021 through May 2022 [Member]
June 2021 through May 2022 [Member]
June 2021 through May 2022 [Member]
June 2022 through May 2023 [Member]
June 2022 through May 2023 [Member]
June 2022 through May 2023 [Member]
June 2023 through May 2024 [Member]
June 2023 through May 2024 [Member]
June 2023 through May 2024 [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, General Disclosures [Line Items]
Requested Annual Increase
Requested Annual Increase
Requested annual increase.
Amount Of Annual Delayed Customer Billing To Residential Customers
Amount Of Annual Delayed Customer Billing To Residential Customers
Amount of annual delayed customer billing to residential customers.
Amount Of Recovery Requested Related To Delayed Billing Including Carrying Charges
Amount Of Recovery Requested Related To Delayed Billing Including Carrying Charges
Amount of recovery requested related to delayed billing, including carrying charges.
Amounts Of Regulatory Assets Under Review In Separate Proceeding
Amounts Of Regulatory Assets Under Review In Separate Proceeding
Amount of regulatory assets under review in separate proceeding.
Requested Base Rate Increase
Requested Base Rate Increase
Requested base rate increase.
Requested Return on Equity
Public Utilities, Requested Return on Equity, Percentage
PUCO-ordered Fixed Price per MW Day for Customers Who Switch During ESP Period
PUCO-Ordered Fixed Price For Customers Who Switch During ESP Period
PUCO-ordered fixed price per MW day for customers who switch during the electric security plan period.
Reliability Pricing Model Rate per MW Day in Effect through May 2014
Reliability Pricing Model Rate In Effect Through May 2014
Reliability pricing model rate per MW day in effect through May 2014.
Reliability Pricing Model Rate per MW Day in Effect from June 2014 through May 2015
Reliability Pricing Model Rate per MW Day in Effect from June 2014 Through May 2015
Reliability pricing model rate per MW day in effect from June 2014 through May 2015.
Retail Stability Rider through May 2014 ($ Per MWh)
Retail Stability Rider For Period June 2012 Through May 2014
Amount per MWh to be collected from customers under the Retail Stability Rider through May 2014.
Retail Stability Rider for the Period June 2014 through May 2015 ($ per MWh)
Retail Stability Rider For Period June 2014 Through May 2015
Amount per MWh to be collected from customers under the Retail Stability Rider for the period June 2014 through May 2015.
Amount of Retail Stability Rider Applied to the Deferred Capacity Costs ($ per MWh)
Retail Stability Rider Amount Applied To Deferred Capacity Costs
Amount per MWh of Retail Stability Rider collected that will be applied to the deferred capacity costs balance for the period June 2014 through May 2015.
Retail Stability Rider Rate to be Continued Until Capacity Deferral Balance is Collected as Ordered by the PUCO ($ per MWh)
Retail Stability Rider Rate to be Continued Until Capacity Deferral Balance is Collected as Ordered by the PUCO ($ per MWh)
The retail stability rider rate to be continued until the capacity deferral balance is collected, as ordered by the PUCO ($ per MWh).
Deferred Capacity Costs Recovery Period as Ordered by PUCO (in months)
Deferred Capacity Costs Recovery Period as Ordered by PUCO (in months)
Deferred Capacity Costs Recovery Period as Ordered by PUCO (in months)
Capacity Deferral Balance As Of May 2015 Subject To Audit By PUCO
Capacity Deferral Balance As Of May 2015 Subject To Audit By PUCO
Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.
Regulatory Assets, Noncurrent
Amount of Deferred Capacity Costs Collected from Customers
Amount of Deferred Capacity Costs Collected from Customers
Amount of deferred capacity costs, and related carrying charges, that OPCo has collected from customers.
Annual Retail Share of Fixed Fuel Costs
Annual Retail Share of Fixed Fuel Costs
Annual retail share of fixed fuel costs for the period August 2012 through May 2015.
Energy Credit Offset Applied Against the Capacity Deferral Threshold (per MW day)
Energy Credit Offset Applied Against the Capacity Deferral Threshold (per MW day)
Energy Credit Offset Applied Against the Capacity Deferral Threshold (per MW day)
Overstatement of Energy Credit Used in the Determination of the Capacity Deferral Threshold (per MW day)
Overstatement of Energy Credit Used in the Determination of the Capacity Deferral Threshold (per MW day)
Overstatement of Energy Credit Used in the Determination of the Capacity Deferral Threshold (per MW day)
Significantly Excessive Earnings Test Threshold Previously Established for Ohio Power
Significantly Excessive Earnings Test Threshold Previously Established for Ohio Power
Significantly Excessive Earnings Test Threshold Previously Established for Ohio Power
Significantly Excessive Earnings Test Threshold Remanded Back to the PUCO
Significantly Excessive Earnings Test Threshold Remanded Back to the PUCO
Significantly Excessive Earnings Test Threshold Remanded Back to the PUCO
Approved Return on Equity
Public Utilities, Approved Return on Equity, Percentage
Return On Equity Proposed In PPA Stipulation Agreement
Return On Equity Proposed In PPA Stipulation Agreement
Return on common equity proposed in the PPA stipulation agreement.
Amount of Potential Customer Credits to be Included in the PPA Rider Over the Final Four Years as Proposed in Stipulation Agreement
Amount Of Potential Customer Credits To Be Included In PPA Rider Over Final Four Years As Proposed In Stipulation Agreement
Amount of potential additional contingent customer credits to be included in the PPA Rider over the final four years, as proposed in the stipulation agreement.
Solar Energy Projects to be Developed and Implemented by 2021 as Proposed in Stipulation Agreement (in MWs)
Solar Energy Projects To Be Developed And Implemented By 2021 As Proposed In Stipulation Agreement
Solar energy projects to be developed and implemented by 2021 as proposed in stipulation agreement (in MWs).
Wind Energy Projects to be Developed and Implemented by 2021 as Proposed in Stipulation Agreement (in MWs)
Wind Energy Projects To Be Developed And Implemented By 2021 As Proposed In Stipulation Agreement
Wind energy projects to be developed and implemented by 2021 as proposed in stipulation agreement (in MWs).
Percentage of Output to be Received from Solar and Wind Projects as Proposed in Stipulation Agreement
Percentage of Output to be Received from Solar and Wind Projects as Proposed in Stipulation Agreement
Percentage of output to be received from solar and wind projects as proposed in stipulation agreement.
Maximum Ownership Percentage of Solar and Wind Projects as Proposed in Stipulation Agreement
Maximum Ownership Percentage of Solar and Wind Projects as Proposed in Stipulation Agreement
Maximum ownership percentage of solar and wind projects as proposed in stipulation agreement.
Temporary Customer-Specific Rate Impact Cap Through May 2018
Temporary Customer-Specific Rate Impact Cap Through May 2018
Temporay customer-specific rate impact cap through May 2018 as included in PUCO order.
Future Commitment to Support the Development of a Large Solar Farm
Future Commitment To Support Development Of Large Solar Farm
Future commitment to support the development of a large solar farm.
Gridsmart Investment as Proposed in Stipulation Agreement
Gridsmart Investment as Proposed in Stipulation Agreement
Amount of gridSMART investment over a six-year period, as proposed in stipulation agreement.
2008 Coal Contract Settlement Proceeds to be Applied to Deferred Fuel Balance as Originally Ordered by the PUCO
Coal Contract Settlement Proceeds to be Applied to Deferred Fuel Balance
2008 coal contract settlement proceeds to be applied to deferred fuel balance as originally ordered by the PUCO.
Net Favorable Fuel Adjustment Recorded in 2012 Based on Fuel Adjustment Clause Audit Rehearing
Net Favorable Fuel Adjustment Recorded In 2012 Based On Fuel Adjustment Clause Audit Rehearing
Net favorable fuel adjustment recorded in 2012 based upon a 2009 fuel adjustment clause audit rehearing.
Deferred Fuel Adjustment Clause Related to Ormet Interim Arrangement as of September 2009
Deferred Fuel Adjustment Clause Related to Ormet Interim Arrangement as of September 2009
Amount in the deferred fuel adjustment clause related to the Ormet interim arrangement including recognized carrying charges as of September 2009.
Unrecognized Equity Carrying Costs Related to Ormet Interim Arrangement as of September 2009
Unrecognized Equity Carrying Costs Related to Ormet Interim Arrangement as of September 2009
Unrecognized equity carrying costs related to the Ormet interim arrangement as of September 2009.
Debt Disclosure [Abstract]
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.
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.
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.
Nonutility Money Pool Activity [Table Text Block]
Nonutility Money Pool Activity [Table Text Block]
Tabular disclosure of a Nonutility Money Pool participants' money pool activity including: (1) Maximum Borrowings from Nonutility Money Pool; (2) Maximum Loans to Nonutility Money Pool; (3) Average Borrowings from Nonutility Money Pool; (4) Average Loans to Nonutility Money Pool; (5) Net Loans (Borrowings) to/from Nonutility Money Pool as of the balance sheet date. The Nonutility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain nonutility subsidiaries.
Maximum Minimum Average Interest Rates for Funds Borrowed from Loaned to Nonutility Money Pool [Text Block]
Maximum Minimum Average Interest Rates for Funds Borrowed from Loaned to Nonutility Money Pool [Text Block]
Tabular disclosure of the maximum and minimum weighted-average interest rate, calculated on a daily basis and the average interest rates of funds borrowed from or loaned to a Nonutility Money Pool during the period.The Nonutility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain nonutility subsidiaries.
Amos Plant Transfer Costs - West Virginia [Member]
Amos Plant Transfer Costs - West Virginia [Member]
Amos Plant Transfer Costs - West Virginia [Member]
Asset Retirement Obligation - Arkansas, Louisiana [Member]
Asset Retirement Obligation - Arkansas, Louisiana [Member]
Asset Retirement Obligation - Arkansas, Louisiana [Member]
Cook Plant Turbine [Member]
Cook Plant Turbine [Member]
Cook Plant Turbine [Member]
Deferred Cook Plant Life Cycle Management Project Costs - Michigan [Member]
Michigan Deferred Cook Plant Life Cycle Management Project Costs [Member]
Michigan Deferred Cook Plant Life Cycle Management Project Costs [Member]
Gridsmart Costs [Member]
Under Recovered Gridsmart Costs [Member]
Other Regulatory Assets Pending Final Regulatory Approval [Member]
Other Regulatory Assets Pending Final Regulatory Approval [Member]
Other Regulatory Assets Pending Final Regulatory Approval [Member]
Peak Demand Reduction/Energy Efficiency [Member]
Energy Efficiency/Peak Demand Reduction [Member]
Energy Efficiency/Peak Demand Reduction.
Peak Demand Reduction/Energy Efficiency - Virginia [Member]
Peak Demand Reduction/Energy Efficiency - Virginia [Member]
Peak Demand Reduction/Energy Efficiency - Virginia [Member]
Plant Retirement Costs - Asset Retirement Obligation Costs
Asset Retirement Obligation Related to Retired Plants [Member]
Asset Retirement Obligation Related to Retired Plants [Member]
Plant Retirement Costs - Asset Retirement Obligation Costs - Indiana [Member]
Plant Retirement Costs - Asset Retirement Obligation Costs - Indiana [Member]
Plant Retirement Costs - Asset Retirement Obligation Costs - Indiana [Member]
Plant Retirement Costs - Materials and Supplies
Materials and Supplies Related to Retired Plants [Member]
Materials and Supplies Related to Retired Plants [Member]
Rockport Plant Dry Sorbent Injection System - Indiana [Member]
Rockport Plant Dry Sorbent Injection System - Indiana [Member]
Rockport Plant Dry Sorbent Injection System - Indiana [Member]
Shipe Road Transmission Project - FERC [Member]
Shipe Road Transmission Project [Member]
Shipe Road Transmission Project [Member]
Stranded Costs on Abandoned Plants [Member]
Stranded Costs On Abandoned Plants [Member]
Regulatory Asset Return Disclosure [Axis]
Regulatory Asset Return Disclosure [Axis]
Regulatory Asset Return Disclosure Axis
Regulatory Assets Return Disclosure [Domain]
Regulatory Assets Return Disclosure [Domain]
Regulatory Assets Return Disclosure Domain
Regulatory Assets Currently Earning Return [Member]
Regulatory Assets Currently Earning Return [Member]
Regulatory Assets Currently Earning a Return
Regulatory Assets Currently Not Earning Return [Member]
Regulatory Assets Currently Not Earning Return [Member]
Regulatory Assets Currently Not Earning a Return
Regulated Status [Axis]
Regulated Status [Axis]
Regulated Status Axis
Regulated Status [Domain]
Regulated Status [Domain]
Regulated Status Domain
Regulatory Assets Pending Final Regulatory Approval [Member]
Regulatory Assets Pending Final Regulatory Approval [Member]
Regulatory Assets Pending Final Regulatory Approval [Member]
AEP Subsidiaries [Member]
Subsidiaries [Member]
Variable Interest Entities [Axis]
Variable Interest Entities [Axis]
Variable Interest Entity, Classification [Domain]
Variable Interest Entity, Classification [Domain]
Ohio Phase-In-Recovery Funding [Member]
Ohio Phase-In-Recovery Funding [Member]
Ohio Phase-In-Recovery Funding Variable Interest Entity Member
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
Common Stock, No Par Value
Common Stock, No Par Value
Common Stock, Par Value Per Share
Common Stock, Par or Stated Value Per Share
Common Stock, Shares Authorized
Common Stock, Shares Authorized
Common Stock, Shares, Issued
Common Stock, Shares Outstanding
Common Stock, Shares, Outstanding
Treasury Stock, Shares
Treasury Stock, Shares
Variable Interest Entities [Abstract]
Great Plains Energy Inc. [Member]
Great Plains Energy Inc. [Member]
Great Plains Energy Inc. [Member]
Cleco Power, LLC [Member]
Cleco Power, LLC [Member]
Cleco Power LLC Member
AEP Generating Co [Member]
AEP Generating Co [Member]
AEP Generating Company
Transource Energy [Member]
Transource Energy [Member]
Transource Energy [Member]
Variable Interest Entities [Axis]
Protected Cell Of Energy Insurance Services, Inc. [Member]
Protected Cell Of Energy Insurance Services, Inc. [Member]
Protected Cell Of Energy Insurance Services, Inc. Variable Interest Entity Member
AEP Credit, Inc. [Member]
AEP Credit, Inc. [Member]
AEP Credit, Inc. Variable Interest Entity Member
PATH West Virginia Transmission Co, LLC [Member]
PATH West Virginia Transmission Co, LLC [Member]
PATH West Virginia Transmission Co, LLC Variable Interest Entity Member
Dolet Hills Lignite Co, LLC [Member]
Dolet Hills Lignite Co, LLC [Member]
Dolet Hills Lignite Co, LLC Variable Interest Entity Member
AEP Texas Central Transition Funding Co [Member]
AEP Texas Central Transition Funding Co [Member]
AEP Texas Central Transition Funding Company Variable Interest Entity Member
Billings from AEP Service Corporation [Member]
Billings from AEP Service Corporation [Member]
Billings from AEP Service Corporation variable interest entity member.
Billings from AEP Generating Company [Member]
Billings from AEP Generating Company [Member]
Billings from AEP Generating Company variable interest entity member.
Carrying Amount in AEP Service Corporation's Accounts Payable [Member]
Carrying Amount in AEP Service Corporation's Accounts Payable [Member]
Carrying amount in AEP Service Corporation's accounts payable member
Carrying Amount in AEP Generating Company's Accounts Payable [Member]
Carrying Amount in AEP Generating Company's Accounts Payable [Member]
Carrying amount in AEP Generating Company's accounts payable member.
Appalachian Consumer Rate Relief Funding [Member]
Appalachian Consumer Rate Relief Funding [Member]
Appalachian Consumer Rate Relief Funding [Member]
Balance Sheet Location [Axis]
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Balance Sheet Location [Domain]
Current Assets [Member]
Current Assets [Member]
Current Assets
Net Property Plant And Equipment [Member]
Net Property Plant And Equipment [Member]
Net Property Plant And Equipment
Other Non Current Assets [Member]
Other Noncurrent Assets [Member]
Total Assets [Member]
Total Assets [Member]
Total Assets
Current Liabilities [Member]
Current Liabilities [Member]
Current Liabilities
Noncurrent Liabilities [Member]
Noncurrent Liabilities [Member]
Noncurrent Liabilities
Equity [Member]
Equity [Member]
Total Liabilities And Equity [Member]
Total Liabilities And Equity [Member]
Total Liabilities And Equity
Capital Contribution From Parent [Member]
Capital Contribution From Parent [Member]
Capital Contribution From Parent
SWEPCo's Guarantee Of Debt [Member]
SWEPCo's Guarantee Of Debt [Member]
Swepcos Guarantee Of Debt
Total Investment [Member]
Total Investment [Member]
Total Investment
Jointly Owned Utility Plant [Axis]
Jointly Owned Utility Plant [Axis]
Jointly Owned Utility Plant Domain
Jointly Owned Utility Plant [Domain]
Rockport Generating Plant (Unit No. 1) [Member]
Rockport Generating Plant (Unit No. 1) [Member]
Rockport Generating Plant (Unit No. 2) [Member]
Rockport Generating Plant (Unit No. 2) [Member]
Lawrenceburg Generating Station [Member]
Lawrenceburg Generating Station [Member]
Consolidated Assets and Liabilities of Variable Interest Entities
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
ASSETS
Variable Interest Carrying Amount Assets [Abstract]
Variable Interest Carrying Amount Assets.
Assets
Variable Interest Entity, Consolidated, Carrying Amount, Assets
LIABILITIES AND EQUITY
Variable Interest Carrying Amount Liabilities And Equity [Abstract]
Variable Interest Carrying Amount Liabilities And Equity.
Liabilities and Equity
Variable Interest Carrying Amount Liabilities and Equity
Variable Interest carrying amount liabilities and equity.
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
As Reported on the Consolidated Balance Sheet
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
Maximum Exposure
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount
Variable Interest Entities (Textuals) [Abstract]
Variable Interest Entities (Textuals) [Abstract]
Billings from VIE
Billings From VIE
Billings from VIE.
Payments Made by I&M to DCC Fuel
Capital lease Payments made
Capital lease payments made by I&M to DCC Fuel.
Securitization Bonds
Secured Debt
Securitized Transition Assets
Minimum Percentage of Equity AEP Provides
Minimum Percentage of Equity AEP Provides
The minimum percentage of equity AEP Parent provides to AEP Credit.
Percentage of Short Term Borrowing Needs in Excess of Third Party Financings
Percentage Of Short Term Borrowing Needs In Excess Of Third Party Financings
Percentage of short-term borrowing needs in excess of third party financings provided by AEP to AEP Credit.
Insurance Premium Expense to Protected Cell
Insurance premium expense to protected cell
Insurance premium expense to protected cell.
Equity and Voting Ownership Percentage
Equity and Voting Ownership Percentage
Equity And Voting Ownership Percentage
Proceeds from Partnership Contribution
Proceeds from Partnership Contribution
Intercompany Item Eliminated in Consolidation
Unearned Revenue
Carrying amount as of the balance sheet date of unearned revenue that will be recognized over a future period of time consistent with the repayment of Transition Funding III's bond principal balance.
Percentage of VIE Sales of Lignite Produced
Percentage Of VIE Sales Of Lignite Produced
Percentage of VIE sales of lignite produced.
Percentage of DHLCs Debt Guaranteed by Each SWEPCo and CLECO
Percentage Of VIE Debt Guaranteed
Percentage of DHLCs debt guaranteed by each SWEPCo and CLECO.
Percentage of Management Fee Received by SWEPCo from DHLC
Percentage Of VIE Management Fee Received
Percentage of management fee received by SWEPCo from DHLC.
Percentage Ownership of "Allegheny Series" by a Nonaffiliated Company
Percentage of Ownership in subsidiary
Percentage of ownership in Allegheny Series by a nonaffiliated company.
Percentage of Debt Capital Structure in PATH's Stipulation Agreement
Percentage of Debt in PATH's Stipulation Agreement
Percentage of Debt Capital Structure in PATH's Stipulation Agreement
Percentage of Equity Capital Structure in PATH's Stipulation Agreement
Percentage of Equity Capital Structure in PATH's Stipulation Agreement
Percentage of Equity Capital Structure in PATH's Stipulation Agreement
Percentage of Cost of Long Term Debt for PATH's Stipulation Agreement
Percentage of Cost of Long Term Debt for PATH's Stipulation Agreement
Percentage of Cost of Long Term Debt for PATH's Stipulation Agreement
Jointly Owned Utility Plant, Proportionate Ownership Share
Jointly Owned Utility Plant, Proportionate Ownership Share
Percentage Interest in Rockport Plant Unit 2 Lease
Percentage Interest in Lease
AEGCo's percentage interest in Rockport Plant unit 2 lease.
Income Statement [Abstract]
Revenues
Revenues [Abstract]
Vertically Integrated Utilities
Electric Revenue
Transmission and Distribution Utilities
Electrical Transmission and Distribution Revenue
Generation & Marketing
Electrical Generation Revenue
Sales to AEP Affiliates
Revenue from Related Parties
Other Revenues - Affiliated
Related Party Transaction, Other Revenues from Transactions with Related Party
Other Revenues
TOTAL REVENUES
Revenues
Expenses
Operating Expenses [Abstract]
Fuel and Other Consumables Used for Electric Generation
Electric Production Expense
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 are recovered by the Phase In Recover Rider. Amortizations related to recoveries of deferred capacity costs are recovered by the Retail Stability Rider ($1/MWH is the Distribution portion through 5/31/15).
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 and Investment Income
Investment Income, Net
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.
Allowance for Equity Funds Used During Construction
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity
Other Income
Other Income
Interest Expense
INCOME BEFORE INCOME TAX EXPENSE
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest
Income Tax Expense (Credit)
Equity Earnings (Loss) of Unconsolidated Subsidiaries
Income (Loss) from Equity Method Investments
Income from Continuing Operations
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest
Income from Discontinued Operations, Net of Tax
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest
Net Income (Loss)
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
Basic Earnings Per Share Attributable to AEP Common Shareholders from Continuing Operations
Income (Loss) from Continuing Operations, Per Basic Share
Basic Earnings Per Share Attributable to AEP Common Shareholders from Discontinued Operations
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share
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
Diluted Earnings Per Share Attributable to AEP Common Shareholders from Continuing Operations
Income (Loss) from Continuing Operations, Per Diluted Share
Diluted Earnings Per Share Attributable to AEP Common Shareholders From Discontinued Operations
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share
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
Income Tax Policy
Income Tax, Policy [Policy Text Block]
Derivatives and Hedging
Derivatives, Policy [Policy Text Block]
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Defined Benefit Plan and Other Postretirement Benefit Plan [Domain]
Defined Benefit Plan and Other Postretirement Benefit Plan [Domain]
Pension Plans [Member]
Pension Plan [Member]
Other Postretirement Benefit Plans [Member]
Other Postretirement Benefit Plan [Member]
Components of Net Periodic Benefit Cost
Defined Benefit Plan, Net Periodic Benefit Cost [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 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 Gains (Losses)
Net Periodic Benefit Cost (Credit)
Defined Benefit Plan, Net Periodic Benefit Cost
Statement of Cash Flows [Abstract]
Operating Activities
Net Cash Provided by (Used in) Operating Activities [Abstract]
Income from Discontinued Operations
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest
Income from Continuing Operations
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]
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
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.
Change in Regulatory Assets
Change in Regulatory Assets
The increase (decrease) during the reporting period in regulatory assets.
Change in Regulatory Liabilities
Change in Regulatory Liabilities
The increase (decrease) during the reporting period in regulatory liabilities.
Deferral 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.
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
Customer Deposits
Increase (Decrease) in Customer Deposits
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 Restricted Cash for Securitized Funding
Increase (Decrease) in Restricted Cash
Change in Other Temporary Investments, Net
Change In Other Temporary Investments Net
Change in investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.
Change in Advances to Affiliates, Net
Increase (Decrease) in Notes Receivable, Related Parties
Purchases of Investment Securities
Payments to Acquire Investments
Sales of Investment Securities
Proceeds from Sale, Maturity and Collection of Investments
Acquisitions of Nuclear Fuel
Payments for Nuclear Fuel
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]
Issuance of Common Stock, Net
Proceeds from Issuance of Common Stock
Issuance of Long-term Debt
Proceeds from Issuance of Long-term Debt
Change in Short-term Debt, Net
Proceeds from (Repayments of) Short-term Debt, Maturing in Three Months or Less
Change in Advances from Affiliates, Net
Increase (Decrease) in Notes Payable, Related Parties
Retirement of Long-term Debt
Repayments of Long-term Debt
Principal Payments for Capital Lease Obligations
Repayments of Long-term Capital Lease Obligations
Dividends Paid on Common Stock
Payments of Distributions to Affiliates
Dividends Paid on Common Stock
Payments of Ordinary Dividends, Common Stock
Other Financing Activities
Proceeds from (Payments for) Other Financing Activities
Net Cash Flows from (Used for) Financing Activities
Net Cash Provided by (Used in) Financing Activities
Net Cash Flows from (Used for) Discontinued Operating Activities
Cash Provided by (Used in) Operating Activities, Discontinued Operations
Net Cash Flows from (Used for) Discontinued Investing Activities
Cash Provided by (Used in) Investing Activities, Discontinued Operations
Net Cash Flows Used for Discontinued Financing Activities
Cash Provided by (Used in) Financing Activities, Discontinued Operations
Net Increase (Decrease) in Cash and Cash Equivalents
Cash and Cash Equivalents, Period Increase (Decrease)
Cash and Cash Equivalents at Beginning 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, Net
Net Cash Paid (Received) for Income Taxes
Income Taxes Paid, Net
Noncash Acquisitions Under Capital Leases
Capital Lease Obligations Incurred
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.
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.
Commitments Guarantees and Contingencies [Abstract]
Major Property Class [Axis]
Major Property Class [Axis]
Major Property Class [Domain]
Major Property Class [Domain]
Railcar Lease [Member]
Railcar Lease [Member]
Lease Type Three.
Boat and Barge Leases [Member]
Boat and Barge Leases [Member]
Boat and Barge Leases [Member]
Loss Contingencies by Nature of Contingency [Axis]
Loss Contingency Nature [Axis]
Loss Contingency, Nature [Domain]
Loss Contingency, Nature [Domain]
Superfund and State Remediation [Member]
Superfund and State Remediation [Member]
Superfund and State Remediation Member.
Wage and Hours Lawsuit [Member]
Wage and Hours Lawsuit [Member]
Wage and hours lawsuit range of loss of amounts alleged by the plaintiffs to be denied overtime pay in violation of the Fair Labor Standards Act. Payments, if any, would be shared among the 78 plaintiffs.
Guarantor Obligations by Nature [Axis]
Guarantor Obligations, Nature [Axis]
Guarantor Obligations, Nature [Domain]
Guarantor Obligations, Nature [Domain]
Letters of Credit [Member]
Letters of Credit [Member]
Letters of Credit Member.
Guarantees of Third Party Obligations [Member]
Guarantees of Third Party Obligations [Member]
Guarantees of Third Party Obligations Member.
Master Lease Agreements [Member]
Master Lease Agreements [Member]
Master Lease Agreements Member.
Maximum Future Payments for Letters of Credit Under Uncommitted Facilities [Abstract]
Maximum Future Payments for Letters of Credit Under Uncommitted Facilities [Abstract]
Maximum Future Payments for Letters of Credit Under Uncommitted Facilities [Abstract]
Maximum Future Payments for Letters of Credit Issued Under the Uncommitted Facility
Maximum Future Payments for Letters of Credit Issued Under the Uncommitted Facility
Maximum future payments for Letters of Credit issued under the uncommitted facility.
Pollution Control Bonds Supported by Bilateral Letters of Credit [Abstract]
Pollution Control Bonds Supported by Bilateral Letters of Credit [Abstract]
Variable Rate PCBs Supported
Variable Rate PCBs Supported
Amount of Pollution Control Bonds supported by bilateral letters of credit.
Bilateral Letters of Credit
Letters of Credit Outstanding, Amount
Maximum Potential Loss on Master Lease Agreements [Abstract]
Maximum Potential Loss on Master Lease Agreements [Abstract]
Max Potential Loss on Master Lease Agreements
Max Potential Loss on Master Lease Agreements
Maximum potential loss on master lease agreements.
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
Maximum Future Payments for Letters of Credit
Maximum Future Payments for Letters of Credit
Maximum future payments for Letters of Credit issued under the two credit facilities.
Uncommitted Facility
Uncommitted Facility
Amount of letters of credit drawn on an uncommitted credit facility.
Guarantees of Mine Reclamation, Amount
Guarantees Of Mine Reclamation Amount
Guarantees of mine reclamation, amount.
Estimated Final Cost Mine Reclamation
Estimated Final Cost Mine Reclamation
Estimated final cost mine reclamation.
Total Amount Collected through a Rider for Final Mine Closure and Reclamation Costs
Amount Collected Through Rider For Final Mine Closure And Reclamation Costs
Total amount collected through a rider for final mine closure and reclamation costs.
Amount Collected through a Rider for Final Mine Closure - Other Liabilities Noncurrent
Amount Collected Rider Mine Close Other Liabilities Noncurrent
Amount collected through a rider for final mine closure and reclamation costs recorded in deferred credits and other noncurrent liabilities
Amount Collected through a Rider for Final Mine Closure - ARO Noncurrent
Amount Collected, Rider Mine Close ARO Noncurrent
Amount collected through a rider for final mine closure and reclamation costs recorded in asset retirement obligations
Future Minimum Lease Obligation for Remaining Railcars
Operating Leases, Future Minimum Payments Due
Guaranteed Sales Proceeds Percentage of Fair Value to Lessor Current Term
Sale Proceeds Guaranteed by Lessor Under Current Five Year Lease Term
Sale proceeds guaranteed by lessor under current five year lease term.
Guaranteed Sales Proceeds Percentage of Fair Value to Lessor End of Max Lease Term
Sale Proceeds Guaranteed by Lessor at End of Twenty Year Term
Sale proceeds guaranteed by lessor at the end of 20-year term.
Maximum Potential Loss on Guarantee of Return-and-Sale Option
Maximum Potential Loss Related to Guarantee
Maximum potential loss related to the guarantee.
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.
Expense Recorded Due to Remediation Work Remaining Provision
Environmental Remediation Expense
Range of Possible Loss
Range of Possible Loss
Wage and hours lawsuit range of loss of amounts alleged by the plaintiffs to be denied overtime pay in violation of the Fair Labor Standards Act. Payments, if any, would be shared among the 78 plaintiffs.
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]
Notional Volume of Derivative Instruments
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]
Cash Collateral Netting
Cash Collateral Netting [Text Block]
Tabular disclosure of cash collateral netting.
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]
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.
Collateral Required Under Various Triggering Events
Collateral Required [Text Block]
Tabular disclosure of the collateral required under various triggering events.
Liabilities Subject to Cross Default Provisions
Cross Default Provision [Text Block]
Tabular disclosure of liabilities subject to cross default provisions.
Segments [Axis]
Segments [Axis]
Segments [Domain]
Segments [Domain]
Corporate and Other [Member]
Corporate and Other [Member]
Other Revenues
Disposal Group, Including Discontinued Operation, Revenue
Other Operation Expense
Disposal Group, Including Discontinued Operation, Other Operation Expense
Amount of other operation expense attributable to disposal group, including, but not limited to, discontinued operation.
Maintenance Expense
Disposal Group, Including Discontinued Operation, Maintenance Expense
Amount of maintenance expense attributable to disposal group, including, but not limited to, discontinued operation.
Depreciation and Amortization Expense
Disposal Group, Including Discontinued Operation, Depreciation and Amortization
Taxes Other Than Income Taxes
Disposal Group Including Discontinued Operation, Taxes Other Than Income Tax
Amount of tax other than income tax expense attributable to disposal group, including, but not limited to, discontinued operation.
Total Expense
Disposal Group, Including Discontinued Operation, Expense
Amount of expense attributable to disposal group, including, but not limited to, discontinued operation.
Other Expense
Disposal Group, Including Discontinued Operation, Other Expense
Pretax Income of Discontinued Operations
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax
Income Tax Expense
Discontinued Operation, Tax Effect of Discontinued Operation
Equity Earnings of Unconsolidated Subsidiaries
Disposal Group Including Discontinued Operation Income (Loss) From Equity Method Investment
Amount of income (loss) from equity method investment attributable to disposal group, including, but not limited to, discontinued operation.
Total Income on Discontinued Operations as Presented on the Statements of Income
Fair Value Measurements
Fair Value Disclosures [Text Block]
Public Utilities, General Disclosures [Abstract]
Rate Matters
Public Utilities Disclosure [Text Block]
Segment Reporting [Abstract]
Reportable Segment Information
Schedule of Segment Reporting Information, by Segment [Table Text Block]
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.
Variable Interest Entities
Consolidation, Variable Interest Entity, Policy [Policy Text Block]
Carrying Amount in AEPSC's Accounts Payable [Member]
Carrying Amount in AEPSC's Accounts Payable [Member]
Carrying Amount in AEPSC's accounts payable.
Consolidated Assets and Liabilities of Variable Interest Entities
Consolidated Assets And Liabilities Of Variable Interest Entities [Table Text Block]
Schedule of consolidated assets and liabilities of variable interest entities.
Companys Investment In Joint Venture
Companys Investment In Joint Venture [Text Block]
Companys investment in joint venture.
Billings from Significant Variable Interest
Billings from Significant Variable Interest [Text Block]
Billings from significant variable interest entity.
Carrying Amount and Classification of Variable Interest in Accounts Payable
Carrying Amount and Classification of Variable Interest in Accounts Payable [Text Block]
The carrying amount and classification of variable interest in accounts payable.
Noncontrolling Interest [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
Securities Available for Sale, Net of Tax
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax
Amortization of Pension and OPEB Deferred Costs, Net of Tax
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of 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 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
Document and Entity Information [Abstract]
Document And Entity Information.
Entities [Table]
Entities [Table]
Entity Registrant Name
Entity Registrant Name
Entity Central Index Key
Entity Central Index Key
Document Type
Document Type
Document Period End Date
Document Period End Date
Amendment Flag
Amendment Flag
Document Fiscal Year Focus
Document Fiscal Year Focus
Document Fiscal Period Focus
Document Fiscal Period Focus
Current Fiscal Year End Date
Current Fiscal Year End Date
Entity Filer Category
Entity Filer Category
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Significant Accounting Matters
Significant Accounting Policies [Text Block]
Variable Interest Entities
Variable Interest Entities [Text Block]
Variable interest entities disclosure
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]
Pollution Control Bonds Supported by Bilateral Letters of Credit
Pollution Control Bonds Supported by Bilateral Letters of Credit [Text Block]
Pollution control bonds supported by bilateral letters of credit.
Maximum Potential Loss on Master Lease Agreements
Maximum Potential Loss on Master Lease Agreements [Text Block]
Maximum potential loss on master lease agreements.
Project [Axis]
Project [Axis]
Project [Domain]
Project [Domain]
Mercury and Air Toxic Standards [Member]
Mercury and Air Toxic Standards [Member]
Mercury and Air Toxic Standards [Member]
Environmental Controls Projects [Member]
Environmental Controls Projects [Member]
Environmental Controls Projects [Member]
ETT Interim Transmission Rates [Member]
ETT Interim Transmission Rates [Member]
ETT Interim Transmission Rates [Member]
Louisiana 2012 Formula Rate Filing [Member]
Louisiana 2012 Formula Rate Filing [Member]
Louisiana 2012 Formula Rate Filing.
Louisiana 2014 Formula Rate Filing [Member]
Louisiana 2014 Formula Rate Filing [Member]
Louisiana 2014 Formula Rate Filing [Member]
Louisiana 2015 Formula Rate Filing [Member]
Louisiana 2015 Formula Rate Filing [Member]
Louisiana 2015 Formula Rate Filing [Member]
Oklahoma Base Rate Case - 2015 [Member]
Oklahoma Base Rate Case [Member]
Oklahoma Base Rate Case [Member]
TCC Distribution Cost Recovery Factor [Member]
TCC Distribution Cost Recovery Factor [Member]
TCC Distribution Cost Recovery Factor [Member]
TNC Distribution Cost Recovery Factor [Member]
TNC Distribution Cost Recovery Factor [Member]
TNC Distribution Cost Recovery Factor [Member]
Texas Base Rate Case [Member]
Texas Base Rate Case [Member]
Texas Base Rate Case.
Welsh Plant, Units 1 and 3 - Environmental Projects [Member]
Welsh Plant Units 1 And 3 Environmental Projects [Member]
Welsh Plant Units 1 And 3 Environmental Projects [Member]
Public Utility [Axis]
Public Utility [Axis]
Utility Plant [Domain]
Utility Plant [Domain]
Northeastern Plant, Unit 3 and Comanche Plant [Member]
Northeastern Plant Unit 3 And Comanche Plant [Member]
Northeastern Plant, Unit 3 and the Comanche Plant [Member]
Northeastern Plant, Unit 4 [Member]
Northeastern Plant Unit 4 [Member]
Northeastern Plant Unit 4 [Member]
Welsh Plant, Unit 2 [Member]
Welsh Plant Unit 2 [Member]
Welsh Plant Unit 2
Welsh Plant, Units 1 and 3 [Member]
Welsh Plant Unit 1 and 3 [Member]
Welsh Plant Unit 1 and 3 [Member]
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.
Amount Of Increased Depreciation Expense Requested
Amount Of Increased Depreciation Expense Requested
Amount of increased depreciation expense requested.
Amount Of Increase Related To Environmental Controls
Amount Of Increase Related To Environmental Controls
Amount of requested increase related to environmental controls to be installed at certain plants.
Amount Of Requested Increase Related To Environmental Consumable Costs In Fuel Adjustment Clause
Amount Of Requested Increase Related To Environmental Consumable Costs In Fuel Adjustment Clause
Amount of the requested increase related to environmental consumable costs included in the FAC.
Projected Capital Costs
Projected Capital Costs
Projected capital costs of property, plant and equipment.
Future Incremental Purchased Capacity And Energy Costs Related To Environmental Projects
Future Incremental Purchased Capacity And Energy Costs Related To Environmental Projects
Future incremental purchased capacity and energy costs that will be incurred related to the environmental compliance plan.
Property, Plant and Equipment, Net
Public Utilities, Property, Plant and Equipment, Net
Intervenor Recommended Increase to Annual Revenue and/or Rider
Intervenor Recommended Increase To Annual Revenue
Intervenor recommended decrease to annual revenue.
Intervenor Recommended Return on Common Equity
Intervenor Recommended Return On Common Equity Range
Intervenor recommended return on common equity.
Intervenor Recommended Increase to Depreciation Expense
Intervenor Recommended Increase to Depreciation Expense
Intervenor recommended increase to depreciation expense.
Interim Annual Base Rate Increase
Public Utilities, Interim Rate Increase (Decrease), Amount
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 by the PUCT.
Louisiana Jurisdictional Share of the Turk Plant
Louisiana Jurisdictional Share Of Turk Plant
Louisiana jurisdictional share of the Turk Plant.
Net Increase in Louisiana Total Rates per the Settlement Agreement
Net Increase In Louisiana Total Rates
Net increase in Louisiana total rates per the settlement agreement.
Base Rate Increase per the Settlement Agreement
Base Rate Increase Per Settlement Agreement
Base rate increase per the settlement agreement.
Fuel Rate Decrease per the Settlement Agreement
Fuel Rate Decrease Per Settlement Agreement
Fuel rate decrease per the settlement agreement.
Return on Common Equity per the Settlement Agreement
Return On Common Equity Per Settlement Agreement
Return on common equity per the settlement agreement.
Reduction To Requested Revenue Increase As Approved In Stipulation Agreement
Reduction To Requested Revenue Increase As Approved In Stipulation Agreement
Reduction to the requested revenue increase as approved by the LPSC in the stipulation agreement.
Additional Requested Annual Increase
Additional Requested Annual Increase
Additional requested annual increase.
Requested Total Annual Increase
Requested Total Annual Increase
Requested total annual increase.
Amount Of Interim Rates Implemented In January 2015 As Approved In Partial Settlement Agreement
Amount Of Interim Rates Implemented In January 2015 As Approved In Partial Settlement Agreement
Amount of interim rates implemented in January 2015, subject to refund, as approved by the LPSC in partial settlement agreement.
Remaining Contractual Construction Obligations
Recorded Unconditional Purchase Obligation
Amount of Recovery Requested Related to Arkansas Retail Jurisdictional Share of Environmental Costs
Amount of Recovery Requested Related to Arkansas Retail Jurisdictional Share of Environmental Costs
Amount of recovery requested related to Arkansas retail jurisdiction share of environmental costs incurred.
Requested Revenue Requirement
Requested Revenue Requirement
Requested revenue requirement.
Regulatory Assets Pending Final Regulatory Approval
Schedule of Regulatory Assets [Table Text Block]
Schedule of Potential Additional Customer Credits Related to the PPA Agreement
Schedule of Potential Additional Customer Credits Related to the PPA Agreement [Table Text Block]
Tabular disclosure of potential additional customer credits related to the modified and approved PPA stipulation agreement.
Results of Discontinued Operation
Disposal Groups, Including Discontinued Operations [Table Text Block]
AEP Texas Central Co [Member]
AEP Texas Central Co [Member]
AEP Texas Central Company Member
Transource Missouri [Member]
Transource Missouri [Member]
Transource Missouri [Member]
Accelerated Share Repurchases, Date [Axis]
Accelerated Share Repurchases, Date [Axis]
Accelerated Share Repurchases, Date [Domain]
Accelerated Share Repurchases, Date [Domain]
Short-term Debt, Type [Axis]
Short-term Debt, Type [Axis]
Short-term Debt, Type [Domain]
Short-term Debt, Type [Domain]
Notes Payable [Member]
Notes Payable, Other Payables [Member]
Commercial Paper [Member]
Commercial Paper [Member]
Debt Instrument [Axis]
Debt Instrument [Axis]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Notes Payable Two [Member]
Notes Payable, Other Payable Two [Member]
A written promise to pay a note to a third party.
Notes Payable Three [Member]
Notes Payable, Other Payable Three [Member]
A written promise to pay a note to a third party.
Notes Payable Four [Member]
Notes Payable, Other Payable Four [Member]
A written promise to pay a note to a third party.
Notes Payable Five [Member]
Notes Payable, Other Payable Five [Member]
A written promise to pay a note to a third party.
Other Long Term Debt [Member]
Other Long Term Debt [Member]
Other long term debt member
Pollution Control Bonds [Member]
Pollution Control Bonds [Member]
Pollution Control Bonds Member.
Securitization Bonds [Member]
Securitization Bonds [Member]
A collateralized debt obligation (backed by pledge, mortgage or other lien on the entity's assets).
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.
Line of Credit Facility [Axis]
Lender Name [Axis]
Line of Credit Facility, Lender [Domain]
Line of Credit Facility, Lender [Domain]
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.
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
Spent Nuclear Fuel Obligation
Spent Nuclear Fuel Obligation, Noncurrent
Other Long-term Debt
Other Long-term Debt
Total Long-term Debt Outstanding
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Long term debt and other securities issued, retired and principal payments made [Abstract]
Long-term debt and other securities issued, retired and principal payments made.
Issuances
Proceeds from Issuance of Debt
Retirements and Principal Payments
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.
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.).
Long- term Debt by Type of Debt and Maturity
Long term Debt by Type of Debt and Maturity [Abstract]
Long term Debt by Type of Debt and Maturity.
Interest Expense [Abstract]
Interest Expense [Abstract]
Interest Income [Abstract]
Interest and Other Income [Abstract]
Securitized Debt for Receivables
Commercial Paper
Commercial Paper
Securitized Debt for Receivables
Short-term Debt, Weighted Average Interest Rate
Weighted Average Interest Rate
Debt, Weighted Average Interest Rate
Comparative Accounts Receivable Information
Proceeds from Sale and Collection of Other Receivables [Abstract]
Effective Interest Rates on Securitization of Accounts Receivable
Effective Interest Rates on Securitization of Accounts Receivable
Effective interest rate on the amount owed for securitized accounts receivables.
Net Uncollectible Accounts Receivable Written Off
Net Uncollectible Accounts Receivable Written Off
Net uncollectible accounts receivable written off.
Customer Accounts Receivable Managed Portfolio
Customer Accounts Receivable Managed Portfolio [Abstract]
Customer accounts receivable managed portfolio.
Accounts Receivable Retained Interest and Pledged as Collateral Less Uncollectible Accounts
Accounts Receivable Retained Interest and Pledged as Collateral Less Uncollectible Accounts
Accounts receivables that have been pledged as collateral less uncollectible accounts as of the balance sheet date.
Total Principal Outstanding
Principal Amount Outstanding on Loans Held-for-sale or Securitization or Asset-backed Financing Arrangement
Delinquent Securitized Accounts Receivable
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement
Bad Debt Reserves Related to Securitization of Accounts Receivable
Bad Debt Reserves Related to Securitized Sale of Accounts Receivable
A valuation allowance for securitized receivables that are expected to be uncollectible.
Unbilled Receivables Related to Securitization of Accounts Receivable
Unbilled Receivables Related to Securitization, Sale of Accounts Receivable
The amount of revenue for work performed for which billing has not occurred related to securitization of accounts receivable.
Accounts Receivable and Accrued Unbilled Revenues
Receivables Held-for-sale [Abstract]
Accounts Receivable and Accrued Unbilled Revenues
Receivables Held-for-sale, Amount
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees and Commissions [Abstract]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Distribution and Servicing Fees
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
Movement in Valuation Allowances and Reserves [Roll Forward]
Movement in Valuation Allowances and Reserves [Roll Forward]
Financing Activities (Textuals) [Abstract]
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.
Repayments of Long-term Debt
Issuance of Long-term Debt
Reacquired Pollution Controls Bonds Held by Trustees
Auction Rate Tax Exempt Long Term Debt Outstanding
Securities that are debt instruments (corporate or municipal bonds) that typically have long-term nominal maturities for which the interest rate is reset through an auction process.
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.
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits [Abstract]
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 Utility Money Pool
Related Party Transaction, Due from (to) Related Party, Current
Authorized Short Term Borrowing Limit
Authorized Short Term Borrowing Limit
Authorized Short-term Borrowing Limit by regulatory orders.
Maximum and Minimum Interest Rates [Abstract]
Maximum and Minimum Interest Rates [Abstract]
Maximum and Minimum Interest Rates.
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.
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 [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.
Comprehensive Income
Comprehensive Income (Loss) Note [Text Block]
Business Segments
Segment Reporting Disclosure [Text Block]
Commitments, Guarantees and Contingencies
Commitments Contingencies and Guarantees [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 Inputs Assets Liabilities Quantitative Information [Table Text Block]
Tabular disclosure of quantitative information about the inputs used in the fair value measurement of assets and liabilities. This disclosure may include, but is not limited to, the fair value of the asset or liability, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs.
Sensitivity of Fair Value Measurements
Fair Value, Option, Qualitative Disclosures Related to Election [Table Text Block]
Consolidation Items [Axis]
Consolidation Items [Axis]
Consolidation Items [Domain]
Consolidation Items [Domain]
Segment Reconciling Items [Member]
Segment Reconciling Items [Member]
Vertically Integrated Utilities [Member]
Vertically Integrated Utilities [Member]
Vertically Integrated Utilities [Member]
Transmission And Distribution Companies [Member]
Transmission And Distribution Companies [Member]
Transmission And Distribution Companies [Member]
AEP Transmission Holdco [Member]
Transmission Operations [Member]
Transmission Operations Member.
Generation And Marketing [Member]
Generation And Marketing [Member]
Generation And Marketing [Member]
All Other [Member]
Other Segments [Member]
Consolidation, Eliminations [Member]
Consolidation, Eliminations [Member]
Reportable Segment Information
Segment Reporting Information, Profit (Loss) [Abstract]
Sales Revenue, Net
Revenue, Net
Revenues
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest
NET INCOME (LOSS)
Balance Sheet Information
Segment Reporting Information, Additional Information [Abstract]
Total Property, Plant and Equipment
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET
Total Assets
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.
Transmission and Distribution Utilities Revenues [Member]
Transmission and Distribution Utilities Revenues [Member]
Transmission and Distribution Revenues.
Generation & Marketing Revenues [Member]
Generation and Marketing Revenues [Member]
Generation and Marketing Revenues.
Electric Generation, Transmission and Distribution Revenues [Member]
Electric Generation Transmission Distribution Revenues [Member]
Electric Generation, Transmission and Distribution Revenues.
Sales to AEP Affiliates [Member]
Sales to AEP Affiliates [Member]
Sales to AEP affiliates.
Purchased Electricity for Resale [Member]
Purchased Electricity for Resale [Member]
Purchased Electricity for Resale.
Other Operation Expense [Member]
Other Operation Expense [Member]
Other operation expense.
Maintenance Expense [Member]
Maintenance Expense [Member]
Maintenance expense.
Regulatory Assets [Member]
Regulatory Assets [Member]
Regulatory Assets.
Regulatory Liabilities [Member]
Regulatory Liabilities [Member]
Regulatory Liabilities.
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member]
Gross Amounts of Risk Management Assets Liabilities Recognized [Member]
Gross Amounts of Risk Management Assets/Liabilities Recognized.
Gross Amounts Offset in the Statement of Financial Position [Member]
Gross Amounts Offset in Statement of Financial Position [Member]
Gross Amounts Offset in the Statement of Financial Position.
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member]
Net Amounts of Assets Liabilities Presented in Statement of Financial Position [Member]
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position.
Power [Member]
Power Contract Member [Member]
Nominal energy measure used to calculate payments on a derivative instrument.
Coal [Member]
Coal Contract [Member]
Natural Gas [Member]
Natural Gas Contract Member [Member]
Nominal energy measure used to calculate payments on a derivative instrument.
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, Mass Notional Amount
Derivative Nonmonetary Mass Notional Amount
Volume of coal derivative contracts.
Derivative, Volume Notional Amount
Derivative Nonmonetary Volume Notional Amount
Volume of heating oil and gasoline derivative contracts.
Derivative, Notional Amount
Derivative, Notional Amount
Cash Collateral Netting
Cash Collateral Netting [Abstract]
Cash collateral netting detail.
Cash Collateral Received Netted Against Risk Management Assets
Securities Received as Collateral
Cash Collateral Paid Netted Against Risk Management Liabilities
Obligation to Return Securities Received as Collateral
Fair Value of Derivative Instruments
Derivative Instrument Detail [Abstract]
Current Risk Management Assets
Total Assets
Current Risk Management Liabilities
Long-term Risk Management Liabilities
Derivative Liability
Total MTM Derivative Contract Net Assets (Liabilities)
Derivative Assets (Liabilities), at Fair Value, Net
Amount of Gain (Loss) Recognized on Risk Management Contracts
Gain (Loss) on Derivative Instruments, Net, Pretax [Abstract]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Gain (Loss) on Derivative Instruments, Net, Pretax
Amount of Gain (Loss) Recognized on Risk Management Contracts
Derivative Risk Management Contracts Gain Loss Recognized As Regulatory Asset Liability
Realized and unrealized gains and losses subject to regulatory accounting treatment recorded as either current or noncurrent on the balance sheets.
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.
Hedging Assets
Hedging Assets
Impact of cash flow hedges on balance sheet hedging assets.
Hedging Liabilities
Hedging Liabilities
Impact of cash flow hedges on balance sheet hedging liabilities.
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.
Amount of Collateral AEP Subsidiaries Would Have Been Required to Post Attributable to RTOs and ISOs
Amount Attributable To RTO and ISO Activities
Aggregate fair value of derivative contracts that would be required to be posted if credit rating had dropped below investment grade that are attributable to Regional Transmission Organizations and Independant System Operators.
Amount Attributable to Other Contracts
Amount Attributable to Other Contracts
The aggregate fair value of other significant contracts that would be required to be posted if credit rating had dropped below investment grade.
Liabilities for Contracts with Cross Default Provisions Prior to Contractual Netting Arrangements
Fair Value Of Derivative Liabilities Subject To Cross Default Provisions
Fair value of derivative liabilities subject to cross-default provisions.
Amount of Cash Collateral Posted
Collateral Already Posted, Aggregate Fair Value
Additional Settlement Liability if Cross Default Provision is Triggered
Assets Needed for Immediate Settlement, Aggregate Fair Value
Derivatives and Hedging (Textuals) [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
Financing Activities
Debt Disclosure [Text Block]
Antidilutive Securities [Axis]
Antidilutive Securities [Axis]
Antidilutive Securities, Name [Domain]
Antidilutive Securities, Name [Domain]
Restricted Stock Units [Member]
Restricted Stock Units [Member]
Basic and Diluted EPS Calculations
Amounts Attributable to AEP Common Shareholders
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
Net Income Attributable to Noncontrolling Interests
Income (Loss) from Continuing Operations Attributable to Parent
Income (Loss) from Continuing Operations Attributable to Parent
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) [Abstract]
Organization and Summary of Significant Accounting Policies Textuals [Abstract]
Organization and Summary of Significant Accounting Policies.
Antidilutive Shares Outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Components of Net Periodic Benefit Cost
Schedule of Net Benefit Costs [Table Text Block]
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Pronouncements
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]