Related Party Transactions [Abstract]
Statement [Table]
Statement [Table]
Legal Entity [Axis]
Legal Entity [Axis]
Entity [Domain]
Entity [Domain]
Statement [Line Items]
Statement [Line Items]
Related Party Transactions
Related Party Transactions Disclosure [Text Block]
Variable Interest Entities [Abstract]
AEP Transmission Co [Member]
AEP Transmission Co [Member]
AEP Transmission Company, LLC.
Appalachian Power Co [Member]
Appalachian Power Co [Member]
Appalachian Power Company Member
Indiana Michigan Power Co [Member]
Indiana Michigan Power Co [Member]
Indiana Michigan Power Company Member
Ohio Power Co [Member]
Ohio Power Co [Member]
Ohio Power Company Member
Public Service Co Of Oklahoma [Member]
Public Service Co Of Oklahoma [Member]
Public Service Company Of Oklahoma Member
Southwestern Electric Power Co [Member]
Southwestern Electric Power Co [Member]
Southwestern Electric Power Company Member
Variable Interest Entities [Axis]
Variable Interest Entities [Axis]
Variable Interest Entity, Classification [Domain]
Variable Interest Entity, Classification [Domain]
Billings from AEP Service Corporation [Member]
Billings from AEP Service Corporation [Member]
Billings from AEP Service Corporation 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
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
Dolet Hills Lignite Co, LLC [Member]
Dolet Hills Lignite Co, LLC [Member]
Dolet Hills Lignite Co, LLC 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
Appalachian Consumer Rate Relief Funding [Member]
Appalachian Consumer Rate Relief Funding [Member]
Appalachian Consumer Rate Relief Funding [Member]
Ohio Phase-In-Recovery Funding [Member]
Ohio Phase-In-Recovery Funding [Member]
Ohio Phase-In-Recovery Funding Variable Interest Entity Member
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.
SWEPCo's Investment In DHLC
SWEPCo's Investment In DHLC [Table Text Block]
SWEPCo's investment in DHLC.
AEP's Investment In OVEC
AEP's Investment In OVEC [Table Text Block]
AEP's investment in OVEC.
Purchased Power from OVEC
Purchased Power from OVEC [Text Block]
Tabular disclosure of purchased power from OVEC.
AEP's Investment In PATH-WV
AEP's Investment in PATH-WV [Table Text Block]
[Table Text Block] for AEP's Investment in PATH-WV.
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.
Retirement Benefits [Abstract]
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Domain]
Concentration Risk Benchmark [Domain]
Regulatory Assets [Member]
Regulatory Assets [Member]
Regulatory Assets.
Deferred Income Taxes [Member]
Deferred Income Taxes [Member]
Deferred Income Taxes.
Net of Tax AOCI [Member]
Net Of Tax AOCI [Member]
Net of Tax Aoci.
Retirement Plan Type [Axis]
Retirement Plan Type [Axis]
Retirement Plan Type [Domain]
Retirement Plan Type [Domain]
Pension Plans [Member]
Pension Plan [Member]
Qualified Pension Plans [Member]
Qualified Pension Plans [Member]
Qualified Pension Plans.
Nonqualified Pension Plans [Member]
Nonqualified Plan [Member]
Other Postretirement Benefit Plans [Member]
Other Postretirement Benefits Plan [Member]
AEP Texas Inc. [Member]
AEP Texas Inc. [Member]
AEP Texas Inc.
Public Utility [Axis]
Public Utility [Axis]
Utility Plant [Domain]
Utility Plant [Domain]
UMWA Withdrawal Obligation [Member]
UMWA Withdrawal Obligation [Member]
Benefit Payment or Receipt by Type [Axis]
Benefit Payment or Receipt by Type [Axis]
Benefit Payment by Plan Type
Benefit Payment or Receipt by Type [Domain]
Benefit Payment or Receipt by Type [Domain]
[Domain] for Benefit Payment by Plan Type
Pension Payments [Member]
Pension Payments [Member]
Pension Payments.
Benefit Payments [Member]
Benefit Payments [Member]
Benefit Payments.
Medicare Subsidy Receipts [Member]
Medicare Subsidy Receipts [Member]
Medicare Subsidy Receipts.
Accumulated Benefit Obligation
Accumulated Benefit Obligation [Abstract]
Accumulated Benefit Obligation.
Accumulated Benefit Obligation
Defined Benefit Plan, Accumulated Benefit Obligation
Underfunded Benefit Obligation
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]
Projected Benefit Obligation
Defined Benefit Plan, Benefit Obligation
Fair Value of Plan Assets
Defined Benefit Plan, Plan Assets, Amount
Underfunded Status, Projected Benefit Obligation
Underfunded Status, Projected Benefit Obligation
The funded status is measured as the difference between the fair value of plan assets and the projected benefit obligation.
Underfunded Status, Accumulated Benefit Obligation
Underfunded Status, Accumulated Benefit Obligation
The funded status is measured as the difference between the fair value of plan assets and the accumulated benefit obligation.
Estimated Future Benefit Payments and Contributions
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
Expected Contributions and Payments During 2020
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year
2020
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months
2021
Defined Benefit Plan, Expected Future Benefit Payment, Year Two
2022
Defined Benefit Plan, Expected Future Benefit Payment, Year Three
2023
Defined Benefit Plan, Expected Future Benefit Payment, Year Four
2024
Defined Benefit Plan, Expected Future Benefit Payment, Year Five
Years 2025 to 2029, in Total
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter
Components of Net Periodic Benefit Cost
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service Cost
Defined Benefit Plan, Service Cost
Interest Cost
Defined Benefit Plan, Interest Cost
Expected Return on Plan Assets
Defined Benefit Plan, Expected Return (Loss) on Plan Assets
Amortization of Prior Service Cost (Credit)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)
Amortization of Net Actuarial Loss
Defined Benefit Plan, Amortization of Gain (Loss)
Settlements
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement
Net Periodic Benefit Cost (Credit)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)
Capitalized Portion
Capitalized Portion Of Net Periodic Benefit Cost
Capitalized portion of Net Periodic Benefit Cost.
Net Periodic Benefit Cost (Credit) Recognized in Expense
Net Periodic Benefit Cost Recognized as Expense
Net Periodic Benefit Cost recognized as expense.
American Electric Power System Retirement Savings Plans
Defined Contribution Plan [Abstract]
Cost of Company Matching Contributions
Defined Contribution Plan, Cost
Benefit Plans Textuals [Abstract]
Benefit Plans Textuals [Abstract]
Benefit Plans.
Matching Contributions Provided Percentage
Matching Contributions Provided Percentage
Matching Contributions Provided Percentage.
Eligible Compensation Contribution by Employee Percentage
Eligible Compensation Contribution By Employee Percentage
Eligible Compensation Contribution by Employee.
Second Matching Contributions Provided Percentage
Second Matching Contributions Provided Percentage
Second Matching Contributions Provided.
Second Eligible Compensation Contribution by Employee Percentage
Second Eligible Compensation Contribution By Employee Percentage
Second Eligible Compensation Contribution By Employee.
Multiemployer Plans Withdrawal Obligation
Multiemployer Plans, Withdrawal Obligation
Noncurrent Regulatory Assets
Regulatory Assets, Noncurrent
Noncurrent Regulatory Liabilities
Regulatory Liability, Noncurrent
Commitments Guarantees and Contingencies [Abstract]
Contractual Commitments
Recorded Unconditional Purchase Obligations [Table Text Block]
Maximum Future Payments for Letters of Credit Issued Under the Uncommitted Facilities
Maximum Future Payments for Letters of Credit Uncommitted Facilities [Table Text Block]
[Table Text Block] for aep_MaximumFuturePaymentsForLettersOfCreditUncommittedFacilitiesTextBlock [Table]
Variable Interest Entities
Consolidation, Variable Interest Entity, Policy [Policy Text Block]
Accounting Policies [Abstract]
Basis of Accounting
Basis of Accounting [Text Block]
Rates and Service Regulation
Regulated Jurisdictions [Policy Text Block]
Identifies the regulatory jurisdictions in which the entity operates and the primary regulator.
Principles of Consolidation
Consolidation, Policy [Policy Text Block]
Accounting for the Effects of Cost-Based Regulation
Regulatory Assets and Liabilities Recognition Criteria [Policy Text Block]
Describes the entity's criteria for recording regulatory assets and regulatory liabilities only because they are included in the rate-setting process, and rate-related accruals and deferrals, such as amounts receivable from (or due to) customers under fuel adjustment clauses and interim rates collected prior to regulatory approval.
Use of Estimates
Use of Estimates, Policy [Policy Text Block]
Cash and Cash Equivalents
Cash and Cash Equivalents, Policy [Policy Text Block]
Restricted Cash for Securitized Funding
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]
Other Temporary Investments
Other Temporary Investments Policy [Text Block]
Policy for Other Temporary Investments
Inventory
Inventory, Policy [Policy Text Block]
Accounts Receivable
Receivable [Policy Text Block]
Allowance for Uncollectible Accounts
Allowance for Uncollectible Accounts Policy [Text Block]
Describes how an entity determines the level of its allowance for doubtful accounts for its trade and other accounts receivable balances, and when impairments, charge-offs or recoveries are recognized. The description identifies the factors that influence management's establishment of the level of the allowance (for example, historical losses and existing economic conditions) and may also include discussion of the risk elements relevant to particular categories of receivables.
Concentrations of Credit Risk and Significant Customers
Concentration Risk, Credit Risk, Policy [Policy Text Block]
Emission Allowances and Renewable Energy Credits
Emission Credits or Allowances, Policy [Policy Text Block]
Property, Plant and Equipment and Equity Investments
Property, Plant and Equipment, Policy [Policy Text Block]
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization
Allowance for Funds Used During Construction, Policy [Policy Text Block]
Fair Value Measurements of Assets and Liabilities
Fair Value of Financial Instruments, Policy [Policy Text Block]
Deferred Fuel Costs
Capitalization and Amortization of Fuel Costs, Policy [Policy Text Block]
Revenue Recognition
Revenue [Policy Text Block]
Levelization of Nuclear Refueling Outage Costs
Levelization Of Nuclear Refueling Outage Costs [Text Block]
Policy for deferring incremental operating and maintenance costs during a refueling for amortization over the fuel burn cycle.
Maintenance
Maintenance Cost, Policy [Policy Text Block]
Income Taxes and Investment Tax Credits
Income Tax, Policy [Policy Text Block]
Excise Taxes
Excise Tax Policy [Text Block]
Describes an entity's accounting policy for excise taxes.
Debt
Debt, Policy [Policy Text Block]
Goodwill and Intangible Assets, Policy
Goodwill and Intangible Assets, Policy [Policy Text Block]
Pension and Other Postretirement Plans
Pension and Other Postretirement Plans, Policy [Policy Text Block]
Investments Held in Trust for Future Liabilities
Defined Benefit Plan Investment Policies And Strategies Narrative Description [Text Block]
A narrative description of investment policies and strategies, including target allocation percentages or range of percentages considering the major categories of plan assets as of the latest statement of financial position presented (on a weighted-average basis for employers with more than one plan), and other factors that are pertinent to an understanding of those policies and strategies such as investment goals, risk management practices, allowable and prohibited investment types including the use of derivatives, diversification, and the relationship between plan assets and benefit obligations. For investment funds disclosed as major categories, the narrative description shall include a description of the significant investment strategies of those funds.
Nuclear Trust Funds
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.
Comprehensive Income (Loss)
Comprehensive Income, Policy [Policy Text Block]
Stock-based Compensation
Share-based Payment Arrangement [Policy Text Block]
Equity Method Investments
Equity Method Investments [Policy Text Block]
Earnings Per Share
Earnings Per Share, Policy [Policy Text Block]
Segment Reporting [Abstract]
Segments [Axis]
Segments [Axis]
Segments [Domain]
Segments [Domain]
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
Transmission Operations [Member]
Transmission Operations Member.
Generation and Marketing [Member]
Generation And Marketing [Member]
Generation And Marketing [Member]
All Other [Member]
Other Segments [Member]
State Transcos [Member]
State Transcos [Member]
State Transcos [Member]
AEPTCo Parent [Member]
AEPTCo Parent [Member]
AEPTCo Parent [Member]
Consolidation Items [Axis]
Consolidation Items [Axis]
Consolidation Items [Domain]
Consolidation Items [Domain]
Reconciling Adjustments [Member]
Consolidation, Eliminations [Member]
Product and Service [Axis]
Product and Service [Axis]
Product and Service [Domain]
Product and Service [Domain]
Vertically Integrated Utilities [Member]
Electricity [Member]
Transmission and Distribution Utilities Revenues [Member]
Transmission and Distribution Utilities Revenues [Member]
Transmission and Distribution Revenues.
Transmission [Member]
Electric Transmission [Member]
Generation and Marketing Revenues [Member]
Generation and Marketing Revenues [Member]
Generation and Marketing Revenues.
Other Revenues [Member]
Other Revenues [Member]
Other Revenues.
Reportable Segment Information
Segment Reporting Information, Profit (Loss) [Abstract]
Revenue from Contracts with Customers
Revenue from Contract with Customer, Including Assessed Tax
Sales to AEP Affiliates
Revenue from Related Parties
Total Revenues
Revenues
Asset Impairments and Other Related Charges
Other Asset Impairment Charges
Utilities Operating Expense, Depreciation and Amortization
Utilities Operating Expense, Depreciation and Amortization
Carrying Costs Income
Carrying Costs Income
Income recorded to accrue a return on certain regulatory assets as granted by a regulator.
Interest Income
Investment Income, Interest and Dividend
Allowance for Equity Funds Used During Construction
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity
Interest Expense
Interest Expense
Income Tax Expense (Benefit)
Income Tax Expense (Benefit)
Equity Earnings (Loss) of Unconsolidated Subsidiaries
Income (Loss) from Equity Method Investments
NET INCOME (LOSS)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Gross Property Additions
Property, Plant and Equipment, Additions
Balance Sheet Information
Segment Reporting Information, Additional Information [Abstract]
Property, Plant and Equipment, Gross, Period Increase (Decrease)
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
Notes Receivable, Related Parties
Notes Receivable, Related Parties
Total Assets
Assets
Investments in Equity Method Investees
Equity Method Investments
Affiliated Long Term Debt Current
Affiliated Long Term Debt Current
Total of the portions of the affiliated carrying amounts as of the balance sheet date of long-term debt, which may include notes payable, bonds payable, debentures, mortgage loans, and commercial paper, which are scheduled to be repaid within one year or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.
Long-term Debt Due Within One Year
Long-term Debt, 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 Debt
Long-term Debt, Excluding Current Maturities
Total Long-term Debt Outstanding
Long-term Debt
Effects of Regulation [Abstract]
Effects of Regulation
Schedule of Regulatory Assets and Liabilities [Text Block]
Equity Method Ownership [Axis]
Equity Method Ownership [Axis]
Information by name of entity in which equity method ownership interest is disclosed.
Equity Method Ownership [Domain]
Equity Method Ownership [Domain]
[Domain] for Equity Method Ownership [Axis]
JV Wind Farms [Member]
JV Wind Farms [Member]
JV Wind Farms [Member]
Berkshire Hathaway [Member]
Berkshire Hathaway [Member]
Berkshire Hathaway.
AEP Transmission Holdco [Member]
AEP Transmission Holdco [Member]
AEP Transmission Holdco.
AEP Transmission Partner [Member]
AEP Transmission Partner [Member]
AEP Transmission Partner
BP Wind Energy [Member]
BP Wind Energy [Member]
BP Wind Energy [Member]
ETT [Member]
ETT [Member]
ETT [Member]
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]
Consolidated Entities [Axis]
Consolidated Entities [Axis]
Consolidated Entities [Domain]
Consolidated Entities [Domain]
Parent Company [Member]
Parent Company [Member]
Trent and Desert Sky Wind Farms [Member]
Trent and Desert Sky Wind Farms [Member]
Trent and Desert Sky Wind Farms [Member]
Apple Blossom and Black Oak [Member]
Apple Blossom and Black Oak [Member]
Apple Blossom and Black Oak
Santa Rita East [Member]
Santa Rita East [Member]
Santa Rita East Wind Farm. AEP owns a 75% interest in the farm.
AEP Texas Central Transition Funding Co [Member]
AEP Texas Central Transition Funding Co [Member]
AEP Texas Central Transition Funding Company Variable Interest Entity Member
Restoration Funding [Member]
Restoration Funding [Member]
Texas Restoration Funding for Hurricane Harvey
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
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 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.
Ohio Valley Electric Corporation [Member]
Ohio Valley Electric Corporation [Member]
Ohio Valley Electric Corporation
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 Noncurrent 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
Equity Components [Axis]
Equity Components [Axis]
Equity Component [Domain]
Equity Component [Domain]
Capital Contribution From Parent [Member]
Capital Contribution From Parent [Member]
Capital Contribution From Parent
Retained Earnings [Member]
Retained Earnings [Member]
SWEPCo's Share of Obligations [Member]
SWEPCo's Share of Obligations [Member]
SWEPCo's share of obligations.
AEP's Ratio of OVEC Debt [Member]
AEP's Ratio of OVEC Debt [Member]
AEP's ratio of OVEC debt.
Total Investment [Member]
Total Investment [Member]
Total Investment
Non-Affiliate Contribution [Member]
Non-Affiliate Contribution [Member]
Non-affiliate contribution.
Total Generation MWs [Member]
Total Generation MWs [Member]
Total Generation MWs [Member]
Long-term PPA MWs [Member]
Long-term PPA MWs [Member]
Long-term PPA MWs [Member]
Sold at Wholesale MWs [Member]
Sold at Wholesale MWs [Member]
Sold at Wholesale MWs [Member]
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]
Estimated Final Cost Mine Reclamation
Mine Reclamation and Closing Liability, Noncurrent
Amount Collected Through 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, Rider Mine Close ARO Noncurrent
Amount Collected, Rider Mine Close ARO Noncurrent
Amount collected through a rider for final mine closure and reclamation costs recorded in asset retirement obligations
Amount Collected, Rider Mine Close Other Assets Noncurrent
Amount Collected, Rider Mine Close Other Assets Noncurrent
Amount collected through a rider for final mine closure and reclamation costs recorded in deferred charges and other noncurrent assets.
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
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
As Reported on the 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)
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 Assets
Securitized Regulatory Transition Assets, Noncurrent
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
Debt-to-Total Capitalization Maximum
Debt-to-Total Capitalization Maximum
Transource Energy's credit facility agreement debt-to-total capitalization percentage maximum.
Proceeds from Partnership Contribution
Proceeds from Partnership Contribution
Non-Affiliate Interest
Non-Affiliate Interest
Non-affiliate member's interest in Desert Sky Wind Farm LLC and Trent Wind Farm LLC for repowering.
AEP Ownership in LLCs
AEP Ownership in LLCs
AEP's ownership in Desert Sky Wind Farm LLC and Trent Wind Farm LLC.
Desert Sky and Trent PPA Period
Desert Sky and Trent PPA Period
Desert Sky and Trent PPA for the sale of power to AEPEP related to deliveries of electricity beginning January 1, 2021 for a 12 year period.
Redeemable Noncontrolling Interest
Redeemable Noncontrolling Interest, Equity, Carrying Amount
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.
AEP's Ownership In OVEC
Cost Method Investment Ownership Percentage
This item represents the ownership percentage of all cost-method investments.
Power Participation Ratio
Power Participation Ratio
Power participation ratio
Approximate OVEC Generating Capacity (MWs)
Utility Plant Generation Capacity
Generating capacity of utility plants.
Intercompany Power Agreement End Date
Intercompany Power Agreement End Date
Intercompany power agreement end date related to OVEC.
Outstanding Indebtedness
Outstanding Indebtedness
Outstanding Indebtedness
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 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 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
Percentage of PATH WV's Lowered Authorized ROE
Percentage of PATH WV's Lowered Authorized ROE
Percentage of PATH WV's Lowered Authorized ROE based on the January 2017 FERC Order and Initial Decision
Percentage of PATH WV's Previously Authorized ROE
Percentage of PATH WV's Previously Authorized ROE
Percentage of PATH WV's previously authorized ROE prior to the January 2017 FERC order and initial decision.
PATH-WV Refund
PATH-WV Refund
PATH-WV refund, including carrying charges, related to 2018 Projected Transmission Revenue Requirement.
Percentage Interest in Lease
Percentage Interest in Lease
AEGCo's percentage interest in Rockport Plant unit 2 lease.
Jointly Owned Utility Plant, Proportionate Ownership Share
Jointly Owned Utility Plant, Proportionate Ownership Share
Amount Of Power Purchased From OVEC
Amount Of Power Purchased From O V E C
Amount of power purchased by the Registrant Subsidiaries from OVEC.
Guarantees Of Mine Reclamation Amount
Guarantees Of Mine Reclamation Amount
Guarantees of mine reclamation, amount.
Noncontrolling Interest in Variable Interest Entity
Noncontrolling Interest in Variable Interest Entity
Equity Method Investment, Ownership Percentage
Equity Method Investment, Ownership Percentage
HLBV Income for Noncontrolling Interests
HLBV Income for Noncontrolling Interests
HLBV Income attributable for Noncontrolling Interests
Percentage of an Asset Acquired
Percentage of an Asset Acquired
Percentage of an asset acquired when AEP does not purchase the entire asset.
WindGenerationMWs
WindGenerationMWs
Wind Generation (MWs)
Production Tax Credits
Production Tax Credits
Production tax credits that are recorded in AEP's consolidated income Tax Expense (Benefit) total.
Accumulated Provisions For Rate Refunds
Accumulated Provisions For Rate Refunds
Refunds for costs collected in formula rates.
Equity Method Investments
Historical Investment Balance
Historical Investment Balance
Historical Investment Balance used in purchase price accounting.
Historical Investment Basis Difference
Historical Investment Basis Difference
Historical Investment Basis Difference. The difference between the historical investment price and th purchase price allocated to an investment.
Equity Method Investment Income
Business Segments
Segment Reporting Disclosure [Text Block]
Statement of Financial Position [Abstract]
Subsidiaries [Member]
Subsidiaries [Member]
AEP Texas Transition and Restoration Funding [Member]
AEP Texas Transition Funding and Restoration Funding [Member]
AEP Texas Transition and Restoration Funding [Member]
Current Assets
Assets, Current [Abstract]
Cash and Cash Equivalents
Cash and Cash Equivalents, at Carrying Value
Restricted Cash
Restricted Cash and Cash Equivalents, Current
Other Temporary Investments
Short-term Investments
Fuel
Inventory, Raw Materials, Gross
Materials and Supplies
Other Inventory, Supplies, Gross
Property, Plant and Equipment
Property, Plant and Equipment, Gross [Abstract]
Other Property, Plant and Equipment
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment
Current Liabilities
Liabilities, Current [Abstract]
Accrued Interest
Interest Payable, Current
Other Noncurrent Assets
Assets, Noncurrent [Abstract]
Securitized Assets
Noncurrent Liabilities
Liabilities, Noncurrent [Abstract]
Equity
Stockholders' Equity Attributable to Parent [Abstract]
Common Stock, No Par Value
Common Stock, No Par Value
Common Stock, Par Value Per Share
Common Stock, Par or Stated Value Per Share
Common Stock, Shares Authorized
Common Stock, Shares Authorized
Common Stock, Shares, Issued
Common Stock, Shares, Issued
Common Stock, Shares Outstanding
Common Stock, Shares, Outstanding
Treasury Stock, Shares
Treasury Stock, Shares
Debt Disclosure [Abstract]
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Servicing Contracts [Member]
Servicing Contracts [Member]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Domain]
Long-term Debt, Type [Domain]
Senior Notes [Member]
Senior Notes [Member]
Pollution Control Bonds [Member]
Pollution Control Bonds [Member]
Pollution Control Bonds Member.
Notes Payable, Other Payables [Member]
Notes Payable, Other Payables [Member]
Securitization Bonds [Member]
Securitization Bonds [Member]
A collateralized debt obligation (backed by pledge, mortgage or other lien on the entity's assets).
Junior Subordinated Notes [Member]
Junior Subordinated Notes [Member]
Junior Subordinated Notes Member
Other Long Term Debt [Member]
Other Long Term Debt [Member]
Other long term debt member
Short-term Debt, Type [Axis]
Short-term Debt, Type [Axis]
Short-term Debt, Type [Domain]
Short-term Debt, Type [Domain]
Commercial Paper [Member]
Commercial Paper [Member]
Loans Payable [Member]
Loans Payable [Member]
Subsequent Event Type [Axis]
Subsequent Event Type [Axis]
Subsequent Event Type [Domain]
Subsequent Event Type [Domain]
Subsequent Event [Member]
Subsequent Event [Member]
Money Pool Participant by Company Type [Axis]
Money Pool Participant by Company Type [Axis]
Money Pool Participant by Company Type.
Money Pool Participant by Company Type [Domain]
Money Pool Participant by Company Type [Domain]
Money Pool Participant by Company Type.
Utility [Member]
Utility [Member]
Utility Company.
Nonutility [Member]
Nonutility [Member]
Nonutility Company.
Direct Borrowing [Member]
Direct Borrowing [Member]
Direct Borrowing and Loans from and to Parent
Statistical Measurement [Axis]
Statistical Measurement [Axis]
Statistical Measurement [Domain]
Statistical Measurement [Domain]
Minimum [Member]
Minimum [Member]
Maximum [Member]
Maximum [Member]
Maximum Interest Rate for Funds Borrowed
Maximum Interest Rate for Funds Borrowed
The maximum weighted-average interest rate of funds outstanding at that time, calculated on a daily basis, borrowed during the period.
Minimum Interest Rate For Funds Borrowed
Minimum Interest Rate For Funds Borrowed
The minimum weighted-average interest rate of funds outstanding at that time, calculated on a daily basis, borrowed during the period.
Maximum Interest Rate For Funds Loaned
Maximum Interest Rate For Funds Loaned
The maximum weighted-average interest rate of funds outstanding at that time, calculated on a daily basis, loaned during the period.
Minimum Interest Rate for Funds Loaned
Minimum Interest Rate for Funds Loaned
The minimum weighted-average interest rate of funds outstanding at that time, calculated on a daily basis, loaned during the period.
Shares of Company
Shares of Company [Abstract]
Shares of Company.
Beginning Balance, Shares
Issued
Stock Issued During Period, Shares, New Issues
Ending Balance, Shares
Treasury Stock, Shares, Beginning Balance
Partners' Capital Account, Units, Treasury Units Reissued
Partners' Capital Account, Units, Treasury Units Reissued
Treasury Stock, Shares, Ending Balance
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
Junior Subordinated Notes
Junior Subordinated Notes
Other Long-term Debt
Other Long-term Debt
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.
Maturity Date Low
Debt Instrument Maturity Date Range Low
Earliest date the outstanding debt instruments are required to be repaid.
Maturity Date High
Debt Instrument Maturity Date Range High
Earliest date the outstanding debt instruments are required to be repaid.
Weighted Average Interest Rate
Long-term Debt, Weighted Average Interest Rate, at Point in Time
Interest Rate
Debt Instrument, Interest Rate, Effective Percentage
Outstanding Long-term Debt
Long-term Debt, Fiscal Year Maturity [Abstract]
Principal Amount, 2020
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months
Principal Amount, 2021
Long-term Debt, Maturities, Repayments of Principal in Year Two
Principal Amount, 2022
Long-term Debt, Maturities, Repayments of Principal in Year Three
Principal Amount, 2023
Long-term Debt, Maturities, Repayments of Principal in Year Four
Principal Amount, 2024
Long-term Debt, Maturities, Repayments of Principal in Year Five
Principal Amount, After 2024
Long-term Debt, Maturities, Repayments of Principal after Year Five
Principal Amount, Total
Long-term Debt, Gross
Unamortized Discount, Net and Debt Issuance Costs
Unamortized Debt Issuance Expense
Short-term Debt
Short term Debt [Abstract]
Short-term Debt.
Securitized Debt for Receivables
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount
Commercial Paper
Commercial Paper
Notes Payable
Notes Payable
Total Short-term Debt
Short-term Debt
Securitized Debt for Receivables
Short-term Debt, Weighted Average Interest Rate, at Point in Time
Debt, Weighted Average Interest Rate
Debt, Weighted Average Interest Rate
Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits [Abstract]
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits [Abstract]
Maximum Borrowings from Money Pool
Maximum Borrowings from Money Pool
Maximum Borrowings from a Money Pool at anytime during the period. The Money Pool represents a centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries.
Maximum Loans to Money Pool
Maximum Loans to Money Pool
Maximum Loans to a Money Pool at anytime during the period. The Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries.
Average Borrowings from Money Pool
Average Borrowings from Money Pool
Average Borrowings from a Money Pool during the period. The Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries.
Average Loans to Money Pool
Average Loans to Money Pool
Average Loans to a Money Pool during the period. The Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries.
Borrowings from Parent
Borrowings from Parent
Borrowings from Parent at period end. Parent represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries.
Loans to Parent
Loans to Parent
Loans to Parent at period end. Parent represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries.
Net Loans (Borrowings) to/from Money Pool
Related Party Transaction, Due from (to) Related Party, Current
Authorized Short Term Borrowing Limit
Authorized Short Term Borrowing Limit
Authorized Short-term Borrowing Limit by regulatory orders.
Maximum and Minimum Interest Rates
Maximum and Minimum Interest Rates [Abstract]
Maximum and Minimum Interest Rates.
Maximum Interest Rate
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
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.
Comparative Accounts Receivable Information
Comparative accounts receivable information [Abstract]
Comparative accounts receivable information.
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 Securitized Sale of Accounts Receivable
Bad Debt Reserves Related to Securitized Sale of Accounts Receivable
A valuation allowance for securitized receivables that are expected to be uncollectible.
Unbilled Receivables Related to Securitization, Sale of Accounts Receivable
Unbilled Receivables Related to Securitization, Sale of Accounts Receivable
The amount of revenue for work performed for which billing has not occurred related to securitization of accounts receivable.
Accounts Receivable and Accrued Unbilled Revenue
Accounts Receivable and Accrued Unbilled Revenue [Abstract]
Accounts Receivable and Accrued Unbilled Revenues
Receivables Held-for-sale, Amount
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold [Abstract]
Proceeds on Sale of Receivables to AEP Credit
Proceeds on Sale of Receivables to AEP Credit [Abstract]
Proceeds from Sale of Receivables to AEP Credit
Proceeds from Sale of Finance Receivables
Financing Activities (Textuals)
Financing Activities Textuals [Abstract]
Financing Activities.
Reaquired Pollution Control 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.
Repayments of Long-term Debt
Repayments of Long-term Debt
Proceeds from Issuance of Long-term Debt
Proceeds from Issuance of Long-term Debt
Due Date
Debt Instrument, Maturity Date 1
Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.).
Equity Units Issued
Equity Units Issued
The amount of AEP Equity Units Issued in connection with the March 2019 issuance of Junior Subordinated Notes.
Per Unit Conversion for Equity Units
Per Unit Conversion for Equity Units
The PAR value for each equity unit as issued
Proceeds from Issuance of Debt
Proceeds from Issuance of Debt
Net Equity Units Issuance Proceeds
Net Equity Units Issuance Proceeds
Net Equity Units proceeds after issuance costs.
Principal Amounts of Junior Subordinated Debt
Principal Amounts of Junior Subordinated Debt
Principal Amounts Of Junior Subordinated Debt. The dollar amount that notes are broken into.
Forward Equity Purchase Contract Date
Forward Equity Purchase Contract Date
Forward Equity Purchase Contract Date
Equity Units Annual Distribution Rate
Equity Units Annual Distribution Rate
Equity Units Annual Distribution Rate
Forward Equity Contract Payment Rate
Forward Equity Contract Payment Rate
Forward Equity Contract Payment Rate
AEP Share Price for Equity Unit Conversion
AEP Share Price for Equity Unit Conversion
AEP Share Price for Equity Unit Conversion
Shares Per Equity Unit
Shares Per Equity Unit
Amount of shares issued per equity unit at maturity
Stockholders' Equity, Other
Stockholders' Equity, Other
Maximum Shares Issued Under Equity Units Conversion
Maximum Shares Issued Under Equity Units Conversion
The maximum shares that can be issued related to AEP's Equity Units
Sub-Limit of Secured Debt
Sub-Limit of Secured Debt
The amount of secured debt as a sub-limit to the amount of contractually defined priority debt as defined in the covenants for AEPTCo's note purchase agreements and indenture.
Maximum Percentage of Consolidated Tangible Net Assets
Maximum Percentage of Consolidated Tangible Net Assets
Maximum percentage of consolidated tangible net assets limit for debt as stated in the covenants in AEPTCO's note purchase agreements and indenture.
Tangible Capital to Tangible Assets
Tangible Capital to Tangible Assets
Maximum Percentage Debt to Capitalization
Maximum Percentage Debt to Capitalization
Maximum level of debt to capitalization persuant to credit agreement leverage restrictions.
Restricted Net Assets
Restricted Net Assets
A segregation of retained earnings which is unavailable for dividend distribution.
Dividend Restrictions
Dividend Payment Restrictions
Amount of restricted net assets of subsidiaries that may not be distributed to Parent in the form of a loan, advance or dividend.
Retained Earnings Available to Pay Dividends
Retained Earnings, Unappropriated
Dividends Paid on Common Stock
Payments of Ordinary Dividends, Common Stock
Credit Facilities, Total
Credit Facilities Structured
Amount of revolving credit facilities.
Weighted Average Interest Rate of Commercial Paper Outstanding During Year
Debt Instrument, Interest Rate During Period
Maximum Amount of Commercial Paper Outstanding
Short-term Debt, Maximum Amount Outstanding During Period
Total Commitment From Bank Conduits To Finance Receivables
Total Commitment From Bank Conduits To Finance Receivables
Total commitment from bank conduits to finance receivables.
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Notional Volume of Derivative Instruments
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]
Fair Value of Derivative Instruments
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Schedule of Derivative Instruments Included in Trading Activities [Table Text Block]
Impact of Fair Value Hedges on Balance Sheet
Impact of Fair Value Hedges on Balance Sheet [Table Text Block]
Impact of Fair Value Hedges on Condensed Balance Sheet [Table Text Block]
Gain (Loss) on Hedging Instruments
Derivative Instruments, Gain (Loss) [Table Text Block]
Impact of Cash Flow Hedges on the Balance Sheet
Impact of Cash Flow Hedges on Balance Sheet [Text Block]
Tabular disclosure of the impact of cash flow hedges on the balance sheet.
Liabilities Subject to Cross Default Provisions
Cross Default Provision [Text Block]
Tabular disclosure of liabilities subject to cross default provisions.
AEP Generation Resources [Member]
AEP Generation Resources [Member]
AEP Generation Resources [Member]
Kentucky Power Co [Member]
Kentucky Power Co [Member]
Kentucky Power Company Member
Wheeling Power Co [Member] [Domain]
Wheeling Power Co [Member] [Domain]
Wheeling Power Co [Member] [Domain]
AEP Wind Holdings LLC [Member]
AEP Wind Holdings LLC [Member]
AEP Wind Holdings LLC [Member]
AEP Subsidiaries [Member]
Related Party [Axis]
Related Party [Axis]
Related Party [Domain]
Related Party [Domain]
Appalachian Power Co. to AEP Transmission Co [Member]
Appalachian Power Co. to AEP Transmission Co [Member]
Appalachian Power Co. to AEPTCo [Axis]
Indiana Michigan Power Co to Kentucky Power Co [Member]
Indiana Michigan Power Co to Kentucky Power Co [Member]
Indiana Michigan Power Co to Kentucky Power Co.
AEP Generating Co to Indiana Michigan Power Co [Member]
AEP Generating Co to Indiana Michigan Power Co [Member]
AEP Generating Co to Indiana Michigan Power Co.
AEP Generating Co to Kentucky Power Co [Member]
AEP Generating Co to Kentucky Power Co [Member]
AEP Generating Co to Kentucky Power Co.
AEP Generating Co to Public Service Co of Oklahoma [Member]
AEP Generating Co to Public Service Co of Oklahoma [Member]
AEP Generating Co to Public Service Co of Oklahoma Member.
AEP Generating Co To Southwestern Electric Power Co [Member]
AEP Generating Co To Southwestern Electric Power Co [Member]
AEP Generating Co to Southwestern Electric Power Co.
AEP Energy Partners, Inc. to AEP Texas Inc. [Member]
AEP Energy Partners, Inc. to AEP Texas Inc. [Member]
AEP Energy Partners, Inc. to AEP Texas Inc. [Member]
Indiana Michigan Power Co to AEP Transmission Co [Member]
Indiana Michigan Power Co to AEP Transmission Co [Member]
Indiana Michigan Power Co to AEP Transmission Co [Member]
Kentucky Power Co to AEP Transmission Co [Member]
Kentucky Power Co to AEP Transmission Co [Member]
Kentucky Power Co to AEP Transmission Co [Member]
Ohio Power Co to AEP Transmission Co [Member]
Ohio Power Co to AEP Transmission Co [Member]
Ohio Power Co to AEP Transmission Co [Member]
Public Service Co of Oklahoma to AEP Transmission Co [Member]
Public Service Co of Oklahoma to AEP Transmission Co [Member]
Public Service Co of Oklahoma to AEP Transmission Co [Member]
Wheeling Power Co to AEP Transmission Co [Member]
Wheeling Power Co to AEP Transmission Co [Member]
Wheeling Power Co to AEP Transmission Co [Member]
Types of Related Party Revenue [Axis]
Types of Related Party Revenue [Axis]
Related Party Revenue [Domain]
Related Party Revenue [Domain]
Direct Sales to East Affiliates [Member]
Direct Sales to East Affiliates [Member]
Direct Sales to East Affiliates.
Direct Sales to West Affiliates [Member]
Direct Sales to West Affiliates [Member]
Direct Sales to West Affiliates.
Auction Sales to OPCo [Member]
Auction Sales To OPCo [Member]
Auction Sales to OPCo.
Direct Sales to AEPEP [Member]
Direct Sales to AEPEP [Member]
Direct Sales to AEPEP.
Transmission Revenues [Member]
Transmission Revenues Affiliated [Member]
Transmission Revenues Affiliated
Types of Related Party Purchases [Axis]
Types of Related Party Purchases [Axis]
Types of related party purchases.
Related Party Purchases [Domain]
Related Party Purchases [Domain]
Related party purchases.
Auction Purchases From AEPEP [Member]
Auction Purchases From AEPEP [Member]
Auction Purchases From AEPEP
Auction Purchases From AEP Energy [Member]
Auction Purchases From AEP Energy Partners [Member] [Domain]
Auction Purchases From AEP Energy Partners [Member] [Domain]
Auction Purchases from AEPSC [Member]
Auction Purchases From AEPSC [Member]
Auction Purchases From AEPSC
Direct Purchases from AEGCo [Member]
Purchases from AEGCo [Member]
Purchases from AEGCo.
Schedule Of Cost Method Investment Cost Method Investee Name [Axis]
Schedule Of Cost Method Investment Cost Method Investee Name [Axis]
Information by investee name in which the entity has an investment accounted for under the cost method of accounting.
Schedule Of Cost Method Investment Cost Method Investee Name [Domain]
Schedule Of Cost Method Investment Cost Method Investee Name [Domain]
Name of each investee in which the entity has an investment accounted for under the cost method of accounting.
Affiliated Revenues and Purchases
Related Party Transaction, Due from (to) Related Party [Abstract]
Affiliated Revenues
Revenue from Related Parties, Net
Revenue from Related Parties, Net
Amount of revenue, fees and commissions earned from transactions, net of provision for refunds between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.
Cost of Purchased Power from Affiliate
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.
Transmission Service Charges
Transmission Agreement [Abstract]
Table format showing net charges of Transmission Agreement.
PJM Net Transmission Service Charges
PJM Net Transmission Service Charges
PJM Net Transmission Service Charges
SPP Net Transmission Service Charges
SPP Net Transmission Service Charges
SPP Net Transmission Service Charges
ERCOT Transmission Service Charges
ERCOT Transmission Service Charges [Abstract]
ERCOT Transmission Service Charges [Abstract]
Billings from ETT for ERCOT Wholesale Transmission Services
Billings from ETT for ERCOT Wholesale Transmission Services
Billings from ETT for ERCOT Wholesale Transmission Services
Oklaunion PPA between AEP Texas and AEPEP
Oklaunion PPA between AEP Texas and AEPEP [Abstract]
Oklaunion PPA between AEP Texas and AEPEP [Abstract]
Oklaunion Purchase Power Agreement
Oklaunion Purchase Power Agreement
AEP Texas has partial ownership in the Oklaunion Plant which is operated by PSO but has leased its entire portion of the output of the plant to a non-utility affiliate. This is the noncurrent liability portion of the lease.
Joint License Agreement
Joint License Agreement [Abstract]
Joint License Agreement [Abstract]
Joint License Agreement
Joint License Agreement
50 year joint license agreement between AEPTCo and operating companies allowing either party to occupy the granting party's facilities or real property.
Cook Coal Terminal
Cook Coal Terminal and SWEPCo Railcar Facility [Abstract]
Cook Coal Terminal and SWEPCo Railcar Facility.
Coal Transloading Services
Coal Transloading Services
Cook Coal Terminal, a division of OPCo, performs coal transloading services at cost.
Railcar Maintenance
Railcar Maintenance
SWEPCo and Cook Coal Terminal, a division of OPCo, perform railcar maintenance services.
Barging, Urea Transloading and Other Services
Barging, Urea Transloading and Other Services [Abstract]
I&M provides barging, urea transloading and other transportation services to affiliates.
Expenses from Barging, Urea Transloading and Other Services
Expenses from Barging, Urea Transloading and Other Services
Expenses from barging, urea transloading and other services provided by I&M.
Central Machine Shop
Central Machine Shop [Abstract]
Central Machine Shop.
Billings for Services from Central Machine Shop Facility
Billings for Services from Central Machine Shop Facility
APCo operates the Central Machine Shop facility which repairs and rebuilds specialized components for the generation plants accross the AEP System.
Sales and Purchases of Property
Sales and Purchases of Property [Abstract]
Sales and purchases of property with affiliates.
Related Party Sales of Property
Related Party Sales of Property
AEP subsidiaries' sales of property with certain affiliates.
Related Party Purchases of Property
Related Party Purchases of Property
AEP subsidiaries' purchases of property with certain affiliates.
Related Party Transactions (Textuals)
Related Party Transactions (Textuals) [Abstract]
Related Party Transactions Textuals Abstract
Percentage of Power Sold under Unit Power Agreement
Power Agreement Between Subsidiaries In Percent
Percentage of power AEGCo sells to KPCo from both units of the Rockport Plant.
Sempra Renewables LLC PPAs [Abstract]
Sempra Renewables LLC PPAs [Abstract]
Sempra Renewables LLC PPAs [Abstract]
Charitable Contribution to AEP Foundation [Abstract]
Charitable Contribution to AEP Foundation [Abstract]
Charitable Contribution to AEP Foundation [Abstract]
Related Party Charitable Contribuions to AEP Foundation
Related Party Charitable Contribuions to AEP Foundation
Related Party Charitable Contribuions to AEP Foundation
Share-based Payment Arrangement, Noncash Expense [Abstract]
Award Type [Axis]
Award Type [Axis]
Award Type [Domain]
Award Type [Domain]
Performance Units and AEP Career Shares Reinvested Dividends Portion For [Member]
Performance Units and AEP Career Shares Reinvested Dividends Portion For [Member]
Performance Units and Career Shares - the related Reinvested Dividends Portion.
Stock Based Compensation [Member]
Stock Based Compensation [Member]
Stock Based Compensation
Stock Unit Accumulation Plan for Non Employee Directors [Member]
Stock Unit Accumulation Plan for Non Employee Directors [Member]
Stock Unit Accumulation Plan for Non-Employee Directors.
Restricted Stock Units (RSUs) [Member]
Restricted Stock Units (RSUs) [Member]
Performance Units [Member]
Performance Units [Member]
Performance Units.
Performance Units and Reinvested Dividends [Member]
Performance Units and Reinvested Dividends [Member]
Perormance Units and Reinvested Dividends [Member]
Antidilutive Securities [Axis]
Antidilutive Securities [Axis]
Antidilutive Securities, Name [Domain]
Antidilutive Securities, Name [Domain]
Restricted Shares and Restricted Stock Units [Member]
Restricted Shares and Restricted Stock Units [Member]
Restricted Shares and Restricted Stock Units.
Share Based Compensation Performance Units Converted to Shares
Share Based Compensation Performance Units Converted to Shares
Share Based Compensation Performance Units Converted to Shares.
Performance Units
Performance units [Abstract]
Performance units.
Awarded Units
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross
Weighted Average Grant Date Fair Value, Granted
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Vesting Period (in years)
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period
Vesting Period
Vesting Period
Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition.
Certified Performance Scores and Units Earned
Certified Performance Scores And Units Earned [Abstract]
Certified Performance Scores and Units Earned.
Certified Performance Score
Share Based Compensation Certified Performance Score
Certified Performance Score as approved by Human Resources Committee of the Board of Directors.
Performance Units Earned
Share Based Compensation Performance Units Earned
Performance Units Earned.
Performance Units Manditorily Deferred as AEP Career Shares
Share Based Compensation Performance Units Manditorily Deferred As Career Shares
Performance Units Manditorily Deferred as Career Shares
Performance Units Voluntarily Deferred into the Incentive Compensation Deferral Program
Share Based Compensation Performance Units Voluntarily Deferred into Incentive Compensation Deferral Program
Performance Units Voluntarily Deferred into the Incentive Compensation Deferral Program.
Share Based Compensation Performance Units to be Settled in Shares
Share Based Compensation Performance Units to be Settled in Shares
Share Based Compensation Performance Units to be Settled in Shares
Performance Units to be Paid in Cash
Share Based Compensation Performance Units to be Paid in Cash
Performance Units to be Paid in Cash.
Cash Payouts
Cash Payouts [Abstract]
Cash Payouts.
Cash Payouts for Performance Units
Cash Payouts for Performance Units
Cash Payouts for Performance Units.
Restricted Stock Units Including Units Awarded for Dividends
Rsus including units awarded for dividends [Abstract]
RSUs including units awarded for dividends.
Awarded Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period
Weighted Average Grant Date Fair Value
Total Fair Value and Total Intrinsic Value of Restricted Shares and Restricted Stock Units Vested
Total fair value and total intrinsic value of restricted shares and restricted stock units vested [Abstract]
Total fair value and total intrinsic value of restricted shares and restricted stock units vested.
Fair Value of Restricted Shares and Restricted Stock Units Vested
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value
Intrinsic Value of Restricted Shares and Restricted Stock Units Vested
Share-based Compensation Arrangement, By Share-based Payment Award, Equity Instruments Other Than Options Vested In Period Total Intrinsic Value
The intrinsic monetary value of equity-based payment equity instruments, excluding stock (or unit) options, that vested during the reporting period as calculated by applying the disclosed pricing methodology.
Status of Nonvested Restricted Shares and Restricted Stock Units
Status of nonvested restricted shares and RSUs [Abstract]
Status of nonvested restricted shares and RSUs.
Nonvested, Shares/Units, Beginning Balance
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Nonvested, Weighted Average Grant Date Fair Value, Beginning of Period
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Shares/Units, Granted
Shares/Units, Vested
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period
Weighted Average Grant Date Fair Value, Vested
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value
Shares/Units, Forfeited
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Weighted Average Grant Date Fair Value, Shares/Units, Forfeited
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value
Nonvested, Shares/Units, Ending Balance
Nonvested, Weighted Average Grant Date Fair Value, End of Period
Stock Unit Accumulation Plan for Non-employee Directors
Stock unit accumulation plan for non employee directors [Abstract]
Stock unit accumulation plan for non-employee directors.
Compensation Cost and Actual Tax Benefit Realized for the Tax Deductions from Compensation Cost for Share-based Payment Arrangements
Compensation cost and actual tax benefit realized [Abstract]
Compensation cost and actual tax benefit realized.
Compensation Cost for Share-based Payment Arrangements
Share-based Payment Arrangement, Expense
Actual Tax Benefit Realized
Share-based Payment Arrangement, Expense, Tax Benefit
Total Compensation Cost Capitalized
Share-based Payment Arrangement, Amount Capitalized
Stock Based Compensation (Textuals)
Stock Based Compensation Textuals [Abstract]
Stock Based Compensation Textuals Abstract.
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant
Number of Shares Remaining Available for Issuance Under the AEP Long-Term Incentive Plan
Common Stock, Capital Shares Reserved for Future Issuance
Reduction in Aggregate Common Shares Authorized Per Share Issued Pursuant to Stock Options or Stock Appreciation Rights
Reduction in Aggregate Common Shares Authorized Per Share Issued Pursuant to Stock Options or Stock Appreciation Rights
Reduction in Aggregate Common Shares Authorized Per Share Issued Pursuant to Stock Options or Stock Appreciation Rights
Performance Score by HR Committee, Lower Range
Performance score by hr Committee lower range
Performance score by HR Committee, lower range.
Performance Score by HR Committee, Higher Range
Performance score by hr Committee higher range
Performance score by HR Committee,higher range.
Maximum Contractual Term of Outstanding Restricted Stock Units (in months)
Maximum Contractual Term of Outstanding Restricted Stock Units
Maximum Contractual Term of Outstanding Restricted Stock Units
Total Aggregate Intrinsic Value of Nonvested Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested
Weighted Average Remaining Contractual Life of Nonvested Shares (in years)
Share Based Compensation By Share Based Payment Award Equity Instruments Other Than Options Outstanding Weighted Average Remaining Contractual Terms
Weighted average remaining contractual term for equity-based awards excluding options.
Number of Years After Termination of Board Service Participant Can Elect to Have Stock Units Paid in Cash
Number of Years After Termination of Board Service Participant Can Elect to Have Stock Units Paid in Cash
Number Of Years After Termination Of Board Service Participant Can Elect To Have Stock Units Paid In Cash
Total Unrecognized Compensation Cost Related to Unvested Share-based Compensation Arrangements Granted
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount
Weighted-average Period of Unrecognized Compensation Costs (in years)
Weighted-average Recognization Period for Unrecognized Compensation Costs
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans.
Equity Payouts For Career Share Distributions
Equity Payouts For Career Share Distributions
Equity Payouts For Career Share Distributions
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate
AEP Common Stock
Schedule of Stock by Class [Table Text Block]
Long-term Debt
Schedule of Debt [Table Text Block]
Long-term Debt 5-Year Maturity
Schedule of Maturities of Long-term Debt [Table Text Block]
Dividend Payment Restrictions
Dividend Payment Restrictions [Text Block]
Lines of Credit and Short-term Debt
Schedule of Short-term Debt [Table Text Block]
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
Utility Money Pool Participants Money Pool Activity And Authorized Borrowing Limits [Text Block]
Tabular disclosure of a Utility Money Pool participants' money pool activity and authorized borrowing limits including: (1) Maximum Borrowings from Utility Money Pool; (2) Maximum Loans to Utility Money Pool; (3) Average Borrowings from Utility Money Pool; (4) Average Loans to Utility Money Pool; (5) Net Loans (Borrowings) to/from Utility Money Pool as of the balance sheet date; (6) Authorized Short-term Borrowing Limit. The Utility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain utility subsidiaries.
Nonutility Money Pool Activity
Nonutility Money Pool Activity [Table Text Block]
Tabular disclosure of a Nonutility Money Pool participants' money pool activity including: (1) Maximum Borrowings from Nonutility Money Pool; (2) Maximum Loans to Nonutility Money Pool; (3) Average Borrowings from Nonutility Money Pool; (4) Average Loans to Nonutility Money Pool; (5) Net Loans (Borrowings) to/from Nonutility Money Pool as of the balance sheet date. The Nonutility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain nonutility subsidiaries.
Direct Borrowing Activity
Direct Borrowing Activity [Table Text Block]
[Table Text Block] for Tabular disclosure of the Direct borrowing participants; activity including: (1) Maximum borrowings from AEP; (2) Maximum Loans to AEP; (3) Average Borrowings from AEP; (4) Average Loans to AEP; (5) Borrowings from AEP as of the balance sheet date; (6) Loans to AEP as of the balance sheet date. Direct Borrowing represents centralized funding mechanism AEP uses to meet the short-term cash requirement of certain subsidiaries.
Maximum and Minimum Interest Rates for Funds Either Borrowed from or Loaned to Utility Money Pool
Maximum And Minimum Interest Rates For Funds Either Borrowed From Or Loaned To Utility Money Pool [Text Block]
Tabular disclosure of the maximum and minimum weighted-average interest rate, calculated on a daily basis, of funds either borrowed from or loaned to a Utility Money Pool during the period. The Utility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain utility subsidiaries.
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool
Average Interest Rates For Funds Borrowed From And Loaned To Utility Money Pool [Text Block]
Tabular disclosure of the average interest rates for funds borrowed from and loaned to a Utility Money Pool. The Utility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain utility subsidiaries.
Maximum, Minimum and Average Interest Rates for Funds Borrowed from and Loaned to the Nonutility Money Pool
Maximum Minimum Average Interest Rates for Funds Borrowed from Loaned to Nonutility Money Pool [Text Block]
Tabular disclosure of the maximum and minimum weighted-average interest rate, calculated on a daily basis and the average interest rates of funds borrowed from or loaned to a Nonutility Money Pool during the period.The Nonutility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain nonutility subsidiaries.
Maximum Minimum and Average Interest Rates for Funds Borrowed from and Loaned to AEP
Maximum Minimum and Average Interest Rates for Funds Borrowed from and Loaned to AEP [Table Text Block]
[Table Text Block] for Tabular disclosure of the maximum and minimum weighted-average interest rate, calculated on a daily basis and the average interest rates of funds borrowed from or loaned to AEP during the period. The Direct Borrowing represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries.
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.
Base Rate [Axis]
Base Rate [Axis]
Base Rate Axis.
Base Rate [Domain]
Base Rate [Domain]
Base Rate Domain.
2019 Texas Base Rate Case [Member]
2019 Texas Base Rate Case [Member]
2019 Texas Base Rate Case [Member]
Environmental Controls Projects [Member]
Environmental Controls Projects [Member]
Environmental Controls Projects [Member]
Oklaunion Power Station [Member]
Oklaunion Generating Station (Unit No. 1) [Member]
Oklaunion Generating Station (Unit No. 1) Member
Dolet Hills Power Station [Member]
Dolet Hills Generating Station (Unit No. 1) [Member]
Dolet Hills Generating Station (Unit No. 1) Member
Deferred Fuel Costs [Member]
Deferred Fuel Costs [Member]
Plant Retirement Costs - Unrecovered Plant [Member]
Plant Retirement Costs - Unrecovered Plant [Member]
Plant Retirement Costs - Unrecovered Plant [Member]
Kentucky Deferred Purchase Power Expenses [Member]
Kentucky Deferred Purchase Power Expenses [Member]
Kentucky Deferred Purchase Power Expenses [Member]
Oklaunion Power Station Accelerated Depreciation [Member]
Oklaunion Power Station Accelerated Depreciation [Member]
Oklaunion Power Station Accelerated Depreciation [Member]
Other Regulatory Assets Not Yet Being Recovered [Member]
Other Regulatory Assets Not Yet Being Recovered [Member]
Other Regulatory Assets Not Yet Being Recovered
Asset Retirement Obligation Related to Retired Plants [Member]
Asset Retirement Obligation Related to Retired Plants [Member]
Asset Retirement Obligation Related to Retired Plants [Member]
Vegetation Management [Member]
Vegetation Management [Member]
Vegetation Management Member.
Cook Plant Study Costs [Member]
Cook Plant Study Costs [Member]
Cook Plant Study Costs.
Storm Related Costs [Member]
Storm Costs [Member]
Asset Retirement Obligation - Louisiana [Member]
Asset Retirement Obligation - Louisiana [Member]
Asset Retirement Obligation - Louisiana [Member]
Meter Replacement Costs [Member]
Meter Replacement Costs [Member]
Meter Replacement Costs
Cook Plant Uprate Project [Member]
Cook Plant Uprate Project [Member]
Cook Plant Uprate Project [Member]
Distribution Decoupling [Member]
Distribution Decoupling [Member]
Ohio Distribution Decoupling.
Over-Recovery of Costs Related to Advanced Metering [Member]
Over-Recovery of Costs Related to Advanced Metering [Member]
Over-Recovery of Costs Related to Advanced Metering [Member]
Mitchell Plant Transfer [Member]
Mitchell Plant Transfer [Member]
Mitchell Plant Transfer [Member]
Michigan Deferred Cook Plant Life Cycle Management Project Costs [Member]
Michigan Deferred Cook Plant Life Cycle Management Project Costs [Member]
Michigan Deferred Cook Plant Life Cycle Management Project Costs [Member]
Cook Plant Turbine [Member]
Cook Plant Turbine [Member]
Cook Plant Turbine [Member]
Ohio Capacity Deferral [Member]
Ohio Capacity Deferral [Member]
Ohio Capacity deferral.
Other Regulatory Assets Being Recovered [Member]
Other Regulatory Assets Being Recovered [Member]
Other Regulatory Assets Being Recovered
Pension Costs [Member]
Pension Costs [Member]
Loss on Reacquired Debt [Member]
Loss on Reacquired Debt [Member]
Unrealized Loss on Forward Commitments [Member]
Unrealized Loss on Forward Commitments [Member]
Unrealized Loss on Forward Commitments
Cook Nuclear Plant Refueling Outage Levelization [Member]
Cook Nuclear Plant Refueling Outage Levelization [Member]
Cook Nuclear Plant Refueling Outage Levelization Member.
Postemployment Benefits [Member]
Postemployment Benefits [Member]
Postemployment Benefits
Medicare Subsidy [Member]
Statement Of Financial Accounting Standards 106 Medicare Subsidy [Member]
Peak Demand/Energy Efficiency [Member]
Peak Demand/Energy Efficiency [Member]
Peak Demand/Energy Efficiency [Member]
PJM/SPP Annual Formula Rate True Up [Member]
PJM/SPP Annual Formula Rate True Up [Member]
PJM/SPP Annual Formula Rate True Up [Member]
PJM Costs and Off-system Sales Margin Sharing [Member]
PJM Costs and Off-system Sales Margin Sharing [Member]
PJM Costs and Off-system Sales Margin Sharing [Member]
Other Regulatory Liabilities Not Yet Being Paid [Member]
Other Regulatory Liabilities Not Yet Being Paid [Member]
Other Regulatory Liabilities Not Yet Being Paid Member.
Excess ADIT Associated with Certain Depreciable Property [Member]
Excess ADIT Associated with Certain Depreciable Property [Member]
Excess ADIT Associated with Certain Depreciable Property [Member]
Excess ADIT that is Not Subject to Rate Normalization Requirements [Member]
Excess ADIT that is Not Subject to Rate Normalization Requirements [Member]
Excess ADIT that is Not Subject to Rate Normalization Requirements [Member]
Asset Removal Costs [Member]
Asset Removal Costs [Member]
Asset Removal Costs Member.
Basic Transmission Cost Rider [Member]
Basic Transmission Cost Rider [Member]
Basic Transmission Cost Rider [Member]
Excess Earnings [Member]
Excess Earnings [Member]
Excess Earnings
Deferred Investment Tax Credits [Member]
Deferred Investment Tax Credits [Member]
Deferred Investment Tax Credits Member.
Other Regulatory Liabilities Being Paid [Member]
Other Regulatory Liabilities Being Paid [Member]
Other Regulatory Liabilities Being Paid
Excess Nuclear Decommissioning Funding [Member]
Excess Asset Retirement Obligations For Nuclear Decommissioning Liability [Member]
Excess Asset Retirement Obligations For Nuclear Decommissioning Liability Member.
PJM Transmission Enhancement Refund [Member]
PJM Transmission Enhancement Refund [Member]
PJM Transmission Enhancement Refund [Member]
Transition and Restoration Charges - Texas [Member]
Stranded Costs [Member]
Spent Nuclear Fuel Liability [Member]
Spent Nuclear Fuel Liability [Member]
Spent Nuclear Fuel Liability
Enhanced Service Reliability Plan [Member]
Enhanced Service Reliability Plan [Member]
Enhanced Service Reliability Plan.
Transmission Rate Adjustment Clause [Member]
Transmission Rate Adjustment Clause [Member]
Transmission Rate Adjustment Clause Regulatory Asset
Deferred Gain on Sale of Rockport Unit 2 [Member]
Deferred Gain on Sale of Rockport Unit 2 [Member]
Deferred Gain on Sale of Rockport Unit 2 [Member]
Energy Efficiency/Peak Demand Reduction [Member]
Energy Efficiency/Peak Demand Reduction [Member]
Energy Efficiency/Peak Demand Reduction.
Unrealized Gain on Forward Commitments [Member]
Unrealized Gain on Forward Commitments [Member]
Unrealized Gain on Forward Commitments Member.
Income Taxes Subject to Flow Through [Member]
Income Taxes Subject to Flow Through [Member]
Income Taxes Subject to Flow Through [Member]
Texas Storm Cost Securitization [Member]
Texas Storm Cost Securitization [Member]
Texas Storm Cost Securitization [Member]
Excess Earnings - Texas [Member]
Excess Earnings - Texas [Member]
Excess Earnings - Texas [Member]
Advanced Metering Infrastructure Surcharge [Member]
Advanced Metering Infrastructure Surcharge [Member]
Advanced Metering Infrastructure Surcharge Member.
Materials and Supplies Related to Retired Plants [Member]
Materials and Supplies Related to Retired Plants [Member]
Materials and Supplies Related to Retired Plants [Member]
Virginia Generation Rate Adjustment Clause [Member]
Virginia Generation Rate Adjustment Clause [Member]
Virginia Generation Rate Adjustment Clause Regulatory Asset
Virginia Jurisdictional AMR Meters [Member]
Virginia Jurisdictional AMR Meters [Member]
Virginia Jurisdictional AMR Meters [Member]
Over-Recovered Customer Rate Relief - West Virginia [Member]
Over-Recovered Customer Rate Relief - West Virginia [Member]
Over-Recovered Customer Rate Relief - West Virginia [Member]
Rate Case Expense - Texas [Member]
Rate Case Expense - Texas [Member]
Rate Case Expense - Texas [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]
Cook Plant, Unit 2 Baffle Bolts - Indiana [Member]
Cook Plant, Unit 2 Baffle Bolts - Indiana [Member]
Cook Plant, Unit 2 Baffle Bolts - Indiana [Member]
Smart Grid Costs [Member]
Smart Grid Costs [Member]
Distribution Investment Rider [Member]
Distribution Investment Rider [Member]
Distribution Investment Rider [Member]
Red Rock Generating Facility [Member]
Red Rock Generating Facility [Member]
Red Rock Generating Facility Member.
Rate Case Expense - Arkansas [Member]
Rate Case Expense - Arkansas [Member]
Rate Case Expense - Arkansas [Member]
Regulatory Assets Current Return [Axis]
Regulatory Assets Currently Return [Axis]
Regulatory Assets Currently Return Axis.
Regulatory Assets Current Return [Domain]
Regulatory Assets Currently Return [Domain]
Regulatory Assets Currently Return 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
Property, Plant and Equipment, Type [Axis]
Property, Plant and Equipment, Type [Axis]
Property, Plant and Equipment, Type [Domain]
Property, Plant and Equipment, Type [Domain]
Generating Units Probable of Abandonment [Member]
Generating Units Probable of Abandonment [Member]
Generating Units Probable of Abandonment [Member]
Regulatory Asset [Axis]
Regulatory Asset [Axis]
Regulatory Asset [Domain]
Regulatory Asset [Domain]
Regulatory Assets Pending Final Regulatory Approval [Member]
Regulatory Assets Not Yet Being Recovered [Member]
Regulatory Assets Not Yet Being Recovered
Regulatory Assets Approved for Recovery [Member]
Regulatory Assets Being Recovered [Member]
Regulatory Assets Being Recovered Member.
Regulatory Liabilities [Axis]
Regulatory Liabilities [Axis]
Regulatory Liabilities Axis.
Regulatory Liabilities [Domain]
Regulatory Liabilities [Domain]
Regulatory Liabilities Domain.
Regulatory Liabilities Currently Not Paying Return [Member]
Regulatory Liabilities Currently Not Paying Return [Member]
Regulatory Liabilities Currently Not Paying Return Member.
Regulatory Liabilities Currently Paying a Return [Member]
Regulatory Liabilities Currently Paying Return [Member]
Regulatory Liabilities Currently Paying Return Member.
Income Tax Related Regulatory Liabilities [Member]
Income Tax Related Regulatory Liabilities [Member]
Income Tax Related Regulatory Liabilities [Member]
Regulatory Liability [Axis]
Regulatory Liability [Axis]
Regulatory Liability [Domain]
Regulatory Liability [Domain]
Regulatory Liabilities Approved for Payment [Member]
Regulatory Liabilities Being Paid [Member]
Regulatory Liabilities Being Paid Member.
Regulatory Liabilities Pending Final Regulatory Determination [Member]
Regulatory Liabilities Not Yet Being Paid [Member]
Regulatory Liabilities Not Yet Being Paid
AEPTHCo's investment in ETT and Transource Energy [Member]
AEPTHCo's investment in ETT and Transource Energy [Member]
AEP Transmission Holdco's investment in ETT and Transource Energy [Member]
Regulated Generating Unit to be Retired
Regulated Generating Unit to be Retired [Abstract]
Regulated Generating Unit to be Retired [Abstract]
Gross Investment
Public Utilities, Property, Plant and Equipment, Generation or Processing
Total Property, Plant and Equipment, Net
Accelerated Depreciation
Accelerated Depreciation
The amount of accelerated depreciation as a regulatory asset for plants to be retired.
Cost of Removal Regulatory Liability
Cost of Removal Regulatory Liability
The regulatory liability recorded for cost of removal.
Expected Retirement Date
Disposal Group, Including Discontinued Operation, Description and Timing of Disposal
Remaining Recovery Period, Plant Depreciation
Remaining Recovery Period, Plant Depreciation
The remaining amortization period for recovery of the plant depreciation.
Regulatory Assets
Regulatory assets are comprised [Abstract]
Regulatory assets are comprised Abstract.
Current Regulatory Assets
Regulatory Assets, Current
Regulatory Asset, Amortization Period
Regulatory Asset, Amortization Period
Regulatory Liabilities
Regulatory liabilities are comprised [Abstract]
Regulatory liabilities are comprised Abstract.
Current Regulatory Liabilities
Regulatory Liability, Current
Remaining Refund Period
Regulatory Liability, Amortization Period
Effects of Regulation Textuals [Abstract]
Effects of Regulation Textuals [Abstract]
Effects of Regulation Textuals [Abstract]
Secured Debt
Cost of Removal
Cost of Removal
Future costs of removal for plants that offset net book value.
Net Book Value of Retired Plants
Net Book Value of Retired Plants
Net Book Value of Retired Plants, before cost of removal, including materials and supplies.
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Share of Net Investment in Dolet Hills Power Station
Share of Net Investment in Dolet Hills Power Station
SWEPCo's share of the net investment in Dolet Hills Power Station.
Dolet Hills Lignite Company Unbilled Fixed Costs
Dolet Hills Lignite Company Unbilled Fixed Costs
Dolet Hills Lignite Company unbilled fixed costs that will be billed to SWEPCo prior to closure.
Oxbow Unbilled Fixed Costs
Oxbow Unbilled Fixed Costs
Oxbow unbilled fixed costs that will be billed to SWEPCo prior to closure.
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment
Property, Plant and Equipment Disclosure [Text Block]
Derivatives and Hedging
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Statement of Stockholders' Equity [Abstract]
Common Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income [Member]
AOCI Attributable to Parent [Member]
Noncontrolling Interests [Member]
Noncontrolling Interest [Member]
TOTAL MEMBER'S EQUITY
Members' Equity
Common Stock, Dividends, Per Share, Declared
Common Stock, Dividends, Per Share, Declared
Beginning Balance
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest
Issuance of Common Stock, Value
Stock Issued During Period, Value, New Issues
Issuance of Common Stock, Shares
Capital Contributions from Parent
Adjustments to Additional Paid in Capital, Other
Capital Contributions from Member
Proceeds from Contributions from Parent
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.
ASU 2018-02 Adoption
Stockholders Equity ASU 2018-02 Adoption
This element represents movements included in the statement of changes in stockholders' equity which are specifically related to the adoption of ASU 2018-02.
ASU 2016-01 Adoption
Stockholders Equity ASU 2016-01 Adoption
This element represents movements included in the statement of changes in stockholders' equity which are specifically related to the adoption of ASU 2016-01.
Common Stock Dividends
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders
Acquisition
Noncash or Part Noncash Acquisition, Other Assets Acquired
Net Income (Loss)
Net Income (Loss) Available to Common Stockholders, Basic
Net Income (Loss) Attributable to Noncontrolling Interests
Net Income (Loss) Attributable to Noncontrolling Interest
Net Income (Loss)
Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss), Net of Tax
Ending Balance
Revenue from Contracts with Customers [Abstract]
Revenue from Contracts with Customers [Abstract]
Disaggregated Revenues from Contracts with Customers
Disaggregation of Revenue [Table Text Block]
Fixed Performance Obligations
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]
Affiliated Accounts Receivable Contracts with Customers
Affiliated Accounts Receivable Contracts with Customers [Table Text Block]
Tabular disclosure of affiliated accounts receivable contracts with customers.
Regulated Generating Units to be Retired
Regulated Generating Units to be Retired [Table Text Block]
Regulated Generating Units to be Retired.
Regulatory Assets
Schedule of Regulatory Assets [Table Text Block]
Regulatory Liabilities
Schedule of Regulatory Liabilities [Table Text Block]
Revenue from Contracts with Customers
Revenue from Contract with Customer [Text Block]
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Income Tax Disclosure [Abstract]
Income Taxes
Income Tax Disclosure [Text Block]
Leases [Abstract]
Finance Lease Assets [Member]
Finance Lease Assets [Member]
Finance Lease Assets.
Finance Lease Liabilities [Member]
Finance Lease Liabilities [Member]
Finance Lease Liabilities.
Operating Lease Assets [Member]
Operating Lease Assets [Member]
Operating Lease Assets
Major Property Class [Axis]
Major Property Class [Axis]
Major Property Class [Domain]
Major Property Class [Domain]
Rockport Lease [Member]
Rockport Lease [Member]
Lease Type One.
Boat and Barge Leases [Member]
Boat and Barge Leases [Member]
Boat and Barge Leases [Member]
Lease Rental Costs
Lease, Cost [Abstract]
Operating Lease, Cost
Operating Lease, Cost
Finance Lease Right-of-Use Asset Amortization
Finance Lease, Right-of-Use Asset, Amortization
Interest Expense on Finance Leases
Finance Lease, Interest Expense
Total Lease Rental Costs
Total Lease Rental Costs
Total Lease Rental Costs.
Supplemental Information Related to Leases
Supplemental Information Related to Leases [Abstract]
Supplemental Information Related to Leases
Weighted-Average Remaining Lease Term, Operating Leases
Operating Lease, Weighted Average Remaining Lease Term
Weighted Average Remaining Lease Term, Finance Leases
Finance Lease, Weighted Average Remaining Lease Term
Weighted Average Discount Rate, Operating Leases
Operating Lease, Weighted Average Discount Rate, Percent
Weighted Average Discount Rate, Finance Leases
Finance Lease, Weighted Average Discount Rate, Percent
Operating Cash Flows Used for Operating Leases
Operating Lease, Payments
Operating Cash Flows Used for Finance Leases
Finance Lease, Interest Payment on Liability
Financing Cash Flows Used for Finance Leases
Finance Lease, Principal Payments
Non-cash Acquisitions Under Operating Leases
Non-cash Acquisitions Under Operating Leases
Non-cash Acquisitions Under Operating Leases
Property, Plant and Equipment and Other Related Obligations Under Finance Leases
Property, Plant and Equipment and Other Related Obligations Under Finance Leases [Abstract]
Property, Plant and Equipment and Other Related Obligations Under Finance Leases
Generation
Total Property, Plant and Equipment
Accumulated Amortization
Net Property, Plant and Equipment Under Finance Leases
Finance Lease, Right-of-Use Asset
Other Liabilities, Noncurrent
Other Liabilities, Noncurrent
Finance Lease Liability Due Within One Year
Other Liabilities, Current
Total Obligations Under Finance Leases
Finance Lease, Liability
Operating Lease Asset and Related Obligations
Operating Lease Asset and Related Obligations [Abstract]
Operating Lease Asset and Related Obligations
Operating Lease Assets
Operating Lease, Right-of-Use Asset
Operating Lease Noncurrent Liability
Operating Lease, Liability, Noncurrent
Operating Lease Liability Due Within One Year
Operating Lease, Liability, Current
Estimated Present Value of Future Minimum Lease Payments on Operating Leases
Operating Lease, Liability
Finance Lease Liabilities Rolling Future Minimum Lease Payments
Finance Lease, Liability, Payment, Due, Rolling Maturity [Abstract]
Finance Leases, 2020
Finance Lease, Liability, Payments, Due in Next Rolling Twelve Months
Finance Leases, 2021
Finance Lease, Liability, Payments, Due in Rolling Year Two
Finance Leases, 2022
Finance Lease, Liability, Payments, Due in Rolling Year Three
Finance Leases, 2023
Finance Lease, Liability, Payments, Due in Rolling Year Four
Finance Leases, 2024
Finance Lease, Liability, Payments, Due in Rolling Year Five
Finance Leases, Later Years
Finance Lease, Liability, Payments, Due in Rolling after Year Five
Finance Leases, Total Future Minimum Lease Payments
Finance Lease, Liability, Payment, Due
Imputed Interest on Finance Leases
Finance Lease, Liability, Undiscounted Excess Amount
Operating Lease Liabilities Rolling Future Minimum Lease Payments
Lessee, Operating Lease, Liability, Payment, Due, Rolling Maturity [Abstract]
Operating Leases, 2020
Lessee, Operating Lease, Liability, Payments, Due Next Rolling Twelve Months
Operating Leases, 2021
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Two
Operating Leases, 2022
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Three
Operating Leases, 2023
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Four
Operating Leases, 2024
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Five
Operating Leases, Later Years
Lessee, Operating Lease, Liability, Payments, Due after Rolling Year Five
Operating Leases, Total Future Minimum Lease Payments
Lessee, Operating Lease, Liability, Payments, Due
Imputed Interest on Operating Leases
Lessee, Operating Lease, Liability, Undiscounted Excess Amount
Finance Lease Future Minimum Lease Payments
Finance Leases Future Minimum Lease Payments [Abstract]
Finance Leases Future Minimum Lease Payments
Finance Leases, 2019
Capital Leases, Future Minimum Payments Due, Next Twelve Months
Finance Leases, 2020
Capital Leases, Future Minimum Payments Due in Two Years
Finance Leases, 2021
Capital Leases, Future Minimum Payments Due in Three Years
Finance Leases, 2022
Capital Leases, Future Minimum Payments Due in Four Years
Finance Leases, 2023
Capital Leases, Future Minimum Payments Due in Five Years
Finance Leases, Later Years
Capital Leases, Future Minimum Payments Due Thereafter
Finance Leases, Total Future Minimum Payments Due
Capital Leases, Future Minimum Payments Due
Estimated Interest Element on Finance Leases
Capital Leases, Future Minimum Payments, Interest Included in Payments
Estimated Present Value of Future Minimum Lease Payments on Finance Leases
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments
Operating Lease Future Minimum Lease Payments
Operating Lease Future Minimum Lease Payments [Abstract]
Operating Lease Future Minimum Lease Payments
Operating Leases, 2019
Operating Leases, Future Minimum Payments Due, Next Twelve Months
Operating Leases, 2020
Operating Leases, Future Minimum Payments, Due in Two Years
Operating Leases, 2021
Operating Leases, Future Minimum Payments, Due in Three Years
Operating Leases, 2022
Operating Leases, Future Minimum Payments, Due in Four Years
Operating Leases, 2023
Operating Leases, Future Minimum Payments, Due in Five Years
Operating Leases, Later Years
Operating Leases, Future Minimum Payments, Due Thereafter
Operating Leases Total Future Minimum Lease Payments
Operating Leases, Future Minimum Payments Due
Maximum Potential Loss
Maximum Potential Loss [Abstract]
Maximum potential loss.
Max Potential Loss on Master Lease Agreements
Max Potential Loss on Master Lease Agreements
Maximum potential loss on master lease agreements.
Future Minimum Rentals, Sale Leaseback Transactions
Minimum Lease Payments, Sale Leaseback Transactions, Fiscal Year Maturity [Abstract]
2020
Minimum Lease Payments, Sale Leaseback Transactions, Next Twelve Months
2021
Minimum Lease Payments, Sale Leaseback Transactions, within Two Years
2022
Minimum Lease Payments, Sale Leaseback Transactions, within Three Years
Total Future Minimum Lease Payments
Minimum Lease Payments, Sale Leaseback Transactions
Leases (Textuals)
Leases Textuals [Abstract]
Leases Textuals Abstract.
Sale and Leaseback Transaction, Gain (Loss), Net
Sale and Leaseback Transaction, Gain (Loss), Net
Lease Term
Lease Term
The term of the lease.
Maximum Potential Lease Payments, AEPRO Barge and Boat Leases
Maximum Potential Lease Payments, AEPRO Barge and Boat Leases
Future potential lease obligations under guaranteed AEPRO boat and barge leases.
Guarantor Obligations, Current Carrying Value
Guarantor Obligations, Current Carrying Value
Guarantee Obligations Current Carrying Value Other Liabilities Current
GuaranteeObligationsCurrentCarryingValueOtherLiabilitiesCurrent
The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees recorded under Other Current Liabilities.
Guarantee Obligations Current Carrying Value Other Liabilities Noncurrent
GuaranteeObligationsCurrentCarryingValueOtherLiabilitiesNoncurrent
The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees under Other Noncurrent Liabilities.
Commitments, Guarantees and Contingencies
Commitments Contingencies and Guarantees [Text Block]
Fair Value Disclosures [Abstract]
Fair Value Measurements
Fair Value Disclosures [Text Block]
Reconciliation of Cash, Cash Equivalents and Restricted Cash
Reconciliation of Cash, Cash Equivalents and Restricted Cash [Table Text Block]
Reconciliation of Cash, Cash Equivalents and Restricted Cash [Table Text Block]
Significant Customers
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
Target Asset Allocations
Target asset allocations [Text Block]
Target asset allocations for assets in the benefits trusts.
Basic and Diluted EPS Calculations
Earnings Per Share [Text Block]
Supplementary Information
Supplementary Information [Text Block]
Supplementary Information.
Comprehensive Income [Abstract]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Discontinued Operations and Disposal Groups [Abstract]
Purchase Price Allocation of an Acquisition [Table Text Block]
Purchase Price Allocation of an Acquisition [Table Text Block]
Purchase Price Allocation of an Acquisition table
Statement of Comprehensive Income [Abstract]
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), Securities, Available-for-sale, Adjustment, after Tax
Amortization of Pension and OPEB Deferred Costs, Net of Tax
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Pension and OPEB Funded Status, Net of Tax
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)
TOTAL COMPREHENSIVE INCOME (LOSS)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Total Comprehensive Income Attributable to Noncontrolling Interest
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO SHAREHOLDERS
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Impairments, Disposition and Assets and Liabilities Held for Sale
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]
Regulated Operations [Abstract]
Public Utilities General Disclosures [Table]
Public Utilities General Disclosures [Table]
Disallowance Item [Axis]
Disallowance Item [Axis]
Disallowance Item [Axis]
Disallowance Item [Domain]
Disallowance Item [Domain]
[Domain] for Disallowance Item [Axis]
Indiana Jurisdictional Meters [Member]
Indiana Jurisdictional Meters [Member]
Indiana Jurisdictional Meters.
Virginia Legislation Affecting Earnings Reviews [Member]
Virginia Legislation Affecting Biennial Reviews [Member]
Virginia Legislation Affecting Biennial Reviews [Member]
Virginia Staff Depreciation Study Request [Member]
Virginia Staff Depreciation Study Request [Member]
Virginia Staff Depreciation Study Request [Member]
Virginia Tax Reform [Member]
Virginia Tax Reform [Member]
Virginia Tax Reform [Member]
2018 West Virginia Base Rate Case [Member]
2018 West Virginia Base Rate Case [Member]
2018 West Virginia Base Rate Case [Member]
Michigan Tax Reform [Member]
Michigan Tax Reform [Member]
Michigan Tax Reform [Member]
2019 Indiana Base Rate Case [Member]
2019 Indiana Base Rate Case [Member]
2019 Indiana Base Rate Case [Member]
2019 Michigan Base Rate Case [Member]
2019 Michigan Base Rate Case [Member]
2019 Michigan Base Rate Case [Member]
2016 SEET Filing [Member]
2016 SEET Filing [Member]
2016 SEET Filing [Member]
FERC Transmission Complaint [Member]
FERC Transmission Complaint [Member]
FERC Transmission Complaint [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, General Disclosures [Line Items]
Percent of Excess Earnings Subject to Refund
Percent of Excess Earnings Subject to Refund
The percent of excess earnings that are subject to refund during the Virginia Trienniel Review
Basis Points Over Authorized Return on Equity Considered Excess Earnings
Basis Points Over Authorized Return on Equity Considered Excess Earnings
The amount of basis points over the authorized ROE considered Excess Earnings.
Approved Return on Common Equity
Approved Return on Common Equity
Percentage of public utility's requested return on equity.
Potential Increase to Total Annual Depreciation Rates
Potential Increase to Total Annual Depreciation Rates
The potential increase in annual depreciation rates if the Virginia SCC issues an order to change depreciation rates as a result of a depreciation study.
Potential Increase to Annual Transmission Depreciation Rates
Potential Increase to Annual Transmission Depreciation Rates
The potential increase in annual transmission depreciation rates if the Virginia SCC issues an order to change depreciation rates as a result of a depreciation study.
Refund Due to Tax Reform
Refund Due to Tax Reform
Additional ongoing refund due to Tax Reform
Refund for Excess ADIT Associated with Certain Depreciable Property
Refund for Excess ADIT Associated with Certain Depreciable Property
Amount of refund to be given through rate reductions, riders, etc related to Excess ADIT Associated with Certain Depreciable Property.
Refund for Excess ADIT Not Subject to Rate Normalization Requirements
Refund for Excess ADIT Not Subject to Rate Normalization Requirements
Amount of refund to be given through rate reductions, riders, etc related to Excess ADIT Not Subject to Rate Normalization Requirements.
One Time Refund of Estimated Excess Taxes Collected
One Time Refund of Estimated Excess Taxes Collected
One time refund to customers for overcollected taxes due to Tax Reform.
Amount of Increase Related to Annual Depreciation Rates
Amount of Increase Related to Annual Depreciation Rates
Amount of increased depreciation expense approved.
Amount of Increase Related to Annual Depreciation Rates due to Proposed Investments
Amount of Increase Related to Annual Depreciation Rates due to Proposed Investments
Amount of increased annual depreciation rates due to proposed investments requested.
Amount of Increase Related to Annual Depreciation Rates due to Increased Depreciation Expense
Amount of Increase Related to Annual Depreciation Rates due to Increased Depreciation Expense
Increase related to annual depreciation rates due to increased depreciation expense requested.
Intervenor Recommended Annual Increase
Intervenor Recommended Annual Increase
Intervenor recommended minimum increase in annual rates.
Amount of Increase Related to Lost Revenue due to Michigan Electric Customer Choice Program
Amount of Increase Related to Lost Revenue due to Michigan Electric Customer Choice Program
Increase related to lost revenue due to Michigan Electric Customer Choice Program requested.
Requested Annual Increase
Requested Annual Increase
Requested annual increase.
Requested Return on Equity
Requested Return on Equity
Requested return on equity.
Approved Amount of Increase Related to Annual Depreciation Rates
Approved Amount of Increase Related to Annual Depreciation Rates
Amount of increase related to annual depreciation rates
Regulatory Assets Used to Offset Tax Savings and Excess ADIT Due to Tax Reform
Regulatory Assets Used to Offset Tax Savings and Excess ADIT Due to Tax Reform
Amount of regulatory assets used to offset tax savings and Excess ADIT due to Tax Reform.
Amount Of Increased Depreciation Expense Requested
Amount Of Increased Depreciation Expense Requested
Amount of increased depreciation expense requested.
Intervenor Recommended Return On Common Equity Range
Intervenor Recommended Return On Common Equity Range
Intervenor recommended return on common equity.
Adjusted Annual Increase Request due to Tax Reform
Adjusted Annual Increase Request due to Tax Reform
Decrease in original requested annul increase due to tax reform
Approved Annual Revenue Increase
Approved Annual Revenue Increase
Amount of approved annual revenue increase.
Projected Capital Costs
Projected Capital Costs
Projected capital costs of property, plant and equipment.
Construction Work in Progress
Construction in Progress, Gross
Provision for Refund
Provision for Refund
Provision for Refund
Intervenor Recommended Return on Common Equity
Intervenor Recommended Return on Common Equity
Amount of return on equity recommended by intervenors.
Recommended Disallowance
Recommended Disallowance from Staff or Intervenors
Recommended disallowance from either staff or intervenors in current case.
Return On Common Equity Per Settlement Agreement
Return On Common Equity Per Settlement Agreement
Return on common equity per the settlement agreement.
Return on Common Equity Inclusive of RTO Per Settlement Agreement
Return on Common Equity Inclusive of RTO Per Settlement Agreement
Settlement agreement filed with the FERC on return on common equity inclusive of RTO
RTO Incentive Adder Per Settlement Agreement
RTO Incentive Adder Per Settlement Agreement
Percent amount of RTO incentive adder included in settlement agreement filed with the FERC.
One Time Refund to Customers Per Settlement Agreement
One Time Refund to Customers Per Settlement Agreement
Settlement agreement filed with the FERC for a one time refund to customers
Increased Cap on Equity Portion of the Capital Structure Per Settlement Agreement
Increased Cap on Equity Portion of the Capital Structure Per Settlement Agreement
Increased cap on equity portion of the capital structure as part of settlement agreement filed at the FERC
Original Cap on Equity Portion of the Capital Structure Prior to Settlement Agreement
Original Cap on Equity Portion of the Capital Structure Prior to Settlement Agreement
The original cap on equity portion of the capital structure prior to settlement agreement.
Second Intervenor Recommended Return on Common Equity
Second Intervenor Recommended Return on Common Equity
Recommended return on common equity filed by second set of intervenors
Income Tax Policy
Statement of Cash Flows [Abstract]
Operating Activites
Net Cash Provided by (Used in) Operating Activities [Abstract]
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation and Amortization
Rockport Plant, Unit 2 Operating Lease Amortization
Operating Lease Cost Rockport
Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability of Rockport Plant.
Deferred Income Taxes
Deferred Income Tax Expense (Benefit)
Amortization of Generation Deferrals
Amortization Of Generation Deferrals
Amortizations related to recoveries of pre-2012 deferred fuel balances that are recovered by the Phase In Recovery Rider. Amortizations related to recoveries of deferred capacity costs that are recovered by the Retail Stability Rider ($4.00/MWh recovery of previously deferred OPCo capacity costs and previously deferred carrying costs per Case No. 14-1186-EL-RDR & March 2017 through June 2019 monthly amortization of remaining RSR capacity costs using the appropriate incremental rate multiplied by the current monthly RSR rider revenue).
Amortization (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.
Pension and Postemployment Benefit Reserves
Pension and Other Postretirement Benefits Cost (Reversal of Cost)
Pension Contributions to Qualified Plan Trust
Payment for Pension Benefits
Change in Regulatory Asset - Catastrophe Reserve
Change in Regulatory Asset - Catastrophe Reserve
The change in regulatory asset balance specifically related to a catastrophe reserve for storm damage.
Property Taxes
Amortization of Deferred Property Taxes
Deferred Fuel Over/Under-Recovery, Net
Fuel Over Under Recovery Net
The net change during the reporting period in the value of the asset (liability) created by an (over) under recovery of fuel costs. An over recovery represents the excess of fuel revenues billed to customers over fuel costs incurred and an under recovery represents excess fuel costs incurred over fuel revenues billed to customers.
Gain on Sale of Merchant Generation Assets
Gain on Sale of Merchant Generation Assets
Amount of gain (loss) on sale of Merchant Generation Assets.
Recovery of Ohio Capacity Costs, Net
Deferral Of Ohio Capacity Costs
The increase (decrease) during the reporting period in amounts for the net under recovery of capacity deferrals related to the differential between $189/MW-day capacity cost and RPM (reliability pricing model) pricing.
Refund of Global Settlement
Provision for Refund - Global Settlement
Provisions for refund for obligations to customers as a result of the OPCo Global Settlement.
Reversal of a Regulatory Provision
Reversal of a Regulatory Provision
Reversal of a Regulatory Provision.
Change in Regulatory Assets
Change in Regulatory Assets
The increase (decrease) during the reporting period in regulatory assets.
Change in Other Noncurrent Assets
Increase (Decrease) in Other Noncurrent Assets
Change in Other Noncurrent Liabilities
Increase (Decrease) in Other Noncurrent Liabilities
Changes in Certain Components of Working Capital:
Increase (Decrease) in Operating Capital [Abstract]
Accounts Receivable, Net
Increase (Decrease) in Accounts and Other Receivables
Fuel, Materials and Supplies
Increase (Decrease) in Inventories
Accounts Payable
Increase (Decrease) in Accounts Payable
Accrued Taxes, Net
Increase (Decrease) in Accrued Taxes Payable
Accrued Interest
Increase (Decrease) in Interest Payable, Net
Rockport Plant, Unit 2 Operating Lease Payments
Operating Lease Payments Rockport
Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use at Rockport Plant.
Other Current Assets
Increase (Decrease) in Other Current Assets
Other Current Liabilities
Increase (Decrease) in Other Current Liabilities
Net Cash Flows from (Used for) Operating Activities
Net Cash Provided by (Used in) Operating Activities
Investing Activities
Net Cash Provided by (Used in) Investing Activities [Abstract]
Construction Expenditures
Payments for Construction in Process
Change in Advances to Affiliates, Net
Increase (Decrease) in Notes Receivable, Related Parties
Purchases of Investment Securities
Payments to Acquire Investments
Sales of Investment Securities
Proceeds from Sale, Maturity and Collection of Investments
Acquisitions of Nuclear Fuel
Payments for Nuclear Fuel
Acquisitions of Assets
Payments to Acquire Property, Plant, and Equipment
Proceeds from Sales of Assets
Proceeds from Sale of Productive Assets
Proceeds From Sale Of Merchant Generation Assets
Proceeds From Sale Of Merchant Generation Assets
The cash inflow from the sale of certain merchant generation assets.
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
Commercial Paper and Credit Facility Borrowings
Proceeds from Short-term Debt, Maturing in More than Three Months
Change in Short-term Debt, Net
Proceeds from (Repayments of) Short-term Debt, Maturing in Three Months or Less
Change in Advances from Affiliates, Net
Increase (Decrease) in Notes Payable, Related Parties
Retirement of Long-term Debt
Commercial Paper and Credit Facility Repayments
Repayments of Short-term Debt, Maturing in More than Three Months
Make Whole Premium on Extinguishment of Long-term Debt
Make Whole Premium on Extinguishment of Long-term Debt
The cash outflow for a make whole premium on long-term debt extinguished early.
Principal Payments for Finance Lease Obligations
Dividends Paid on Common Stock
Payments of Distributions to Affiliates
Other Financing Activities
Proceeds from (Payments for) Other Financing Activities
Net Cash Flows from (Used for) Financing Activities
Net Cash Provided by (Used in) Financing Activities
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect
Net Increase (Decrease) in Cash and Cash Equivalents
Cash and Cash Equivalents, Period Increase (Decrease)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Cash and Cash Equivalents at Beginning of Period
Cash, Cash Equivalents and Restricted Cash at End of Period
Cash and Cash Equivalents at End of Period
Supplementary Information
Supplemental Cash Flow Information [Abstract]
Cash Paid for Interest, Net of Capitalized Amounts
Interest Paid, Excluding Capitalized Interest, Operating Activities
Net Cash Paid (Received) for Income Taxes
Income Taxes Paid, Net
Noncash Acquisitions Under Finance Leases
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability
Construction Expenditures Included in Current Liabilities as of December 31,
Construction in Progress Expenditures Incurred but Not yet Paid
Acquisition of Nuclear Fuel Included in Current Liabilities as of December 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.
Noncash Increase in Advances to Affiliates, Net due to Contribution of Mutual Energy SWEPCo, LLC
Noncash or Part Noncash Acquisition, Investments Acquired
Comprehensive Income
Comprehensive Income (Loss) Note [Text Block]
Goodwill and Intangible Assets Disclosure [Abstract]
Corporate and Other [Member]
Corporate and Other [Member]
Changes in Carrying Amount of Goodwill
Goodwill [Roll Forward]
Goodwill
Goodwill
Impairment Losses
Goodwill, Impairment Loss
Affiliated Revenues
Affiliated Revenues [Text Block]
Tabular disclosure of affiliated revenues.
Affiliated Purchases
Affiliated Purchases [Text Block]
Tabular disclosure of affiliated purchases.
PJM Transmission Service Charges
PJM Transmission Service Charges [Text Block]
Tabular disclosure of PJM Net Transmission Service Charges.
SPP Transmission Service Charges
SPP Transmission Service Charges [Text Block]
Tabular disclosure of SPP Net Transmission Service Charges.
Joint License Agreement
Joint License Agreement [Table Text Block]
[Table Text Block] for Joint License Agreement [Table]
Railcar Maintenance
Railcar Maintenance Services Table [Text Block]
Tabular disclosure of OPCo's Cook Coal Terminal - railcar maintenance.
Barging, Urea Transloading and Other Services
Barging, Urea Transloading and Other Services [Text Block]
Tabular disclosure of I&M barging, urea transloading and other services.
Central Machine Shop
Central Machine Shop [Text Block]
Tabular disclosure of Central Machine Shop billings from APCo.
Related Party Sales of Property
Related Party Sales of Property [Text Block]
Tabular disclosure of related party sales of property.
Related Party Purchases of Property
Related Party Purchases of Property [Text Block]
Tabular disclosure of related party purchases of property.
Charitable Contribution to AEP Foundation [Table Text Block]
Charitable Contribution to AEP Foundation [Table Text Block]
Charitable Contribution to AEP Foundation [Table Text Block]
Sale Leaseback Transaction, Description [Axis]
Sale Leaseback Transaction, Description [Axis]
Sale Leaseback Transaction, Name [Domain]
Sale Leaseback Transaction, Name [Domain]
Lease Rental Costs
Lease, Cost [Table Text Block]
Supplemental Balance Sheet Information Related to Leases
Supplemental Balance Sheet Information Related to Leases [Table Text Block]
Supplemental Balance Sheet Information Related to Leases
Property, Plant and Equipment and Related Obligations Under Finance Leases
Property Plant and Equipment and Related Obligations Under Finance Leases [Table Text Block]
Property, Plant and Equipment and Related Obligations Under Finance Leases.
Operating Lease Assets and Related Obligations
Operating Lease Assets and Related Obligations [Table Text Block]
Operating Lease Assets and Related Obligations
Finance Lease Liabilities Rolling Future Minimum Lease Payments
Finance Lease, Liability, Maturity [Table Text Block]
Operating Lease Liabilities Rolling Future Minimum Lease Payments
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
Future Minimum Lease Payments
Future Minimum Lease Payments [Table Text Block]
Future Minimum Lease Payments.
Maximum Potential Loss
Max Potential Loss on Master Lease Agreements [Table Text Block]
Max potential loss on master lease agreements.
Future Minimum Lease Payments
Future Minimum Lease Payments for Sale and Leaseback [Table Text Block]
Future Minimum Lease Payments for sale-and-leaseback.
Organization and Summary of Significant Accounting Policies
Significant Accounting Policies [Text Block]
Maturity of Credit Facility [Axis]
Maturity of Credit Facility [Axis]
Maturity of Credit Facility
Maturity of Credit Facility [Domain]
maturityofcreditfacility [Domain]
[Domain] for maturityofcreditfacility [Axis]
June 2022 [Member]
June 2022 [Member]
June 2022
Loss Contingency Nature [Axis]
Loss Contingency Nature [Axis]
Loss Contingency, Nature [Domain]
Loss Contingency, Nature [Domain]
Decommissioning and Low Level Waste Accumulation Disposal [Member]
Decommissioning and Low Level Waste Accumulation Disposal [Member]
Decommissioning and Low Level Waste Accumulation Disposal [Member]
Spent Nuclear Fuel Disposal [Member]
Spent Nuclear Fuel Disposal [Member]
Spent Nuclear Fuel Disposal Member
Nuclear Incident Liability [Member]
Nuclear Incident Liability [Member]
Nuclear Incident Liability Member.
Fuel Purchase Contracts [Member]
Fuel Purchase Contracts [Member]
Fuel Purchase Contracts.
Energy and Capacity Purchase Contracts [Member]
Energy and Capacity Purchase Contracts [Member]
Energy and Capacity Purchase Contracts.
Mining Area [Axis]
Mining Area [Axis]
Mining area.
Mining Area [Domain]
Mining Area [Domain]
Mining area.
Guarantor Obligations, 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.
Contractual Commitments
Recorded Unconditional Purchase Obligation, Fiscal Year Maturity Schedule [Abstract]
Less than 1 year
Recorded Unconditional Purchase Obligation Due in Next Twelve Months
For 2-3 years
Recorded Unconditional Purchase Obligation Due Within Two To Three Year
Amount of the recorded unconditional purchase obligation maturing in the next two to three years following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
For 4-5 years
Recorded Unconditional Purchase Obligation Due Within Four To Five Year
Amount of the recorded unconditional purchase obligation maturing in the next four to five years following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
After 5 years
Recorded Unconditional Purchase Obligation Due after Fifth Year
Total Contractual Commitments
Recorded Unconditional Purchase Obligation
Maximum Future Payments for Letters of Credit Under Uncommitted Facilities
Maximum Future Payments for Letters of Credit Under Uncommitted Facilities [Abstract]
Maximum Future Payments for Letters of Credit Under Uncommitted Facilities [Abstract]
Maximum Future Payments for Letters of Credit Issued Under the Uncommitted Facility
Maximum Future Payments for Letters of Credit Issued Under the Uncommitted Facility
Maximum future payments for Letters of Credit issued under the uncommitted facility.
Commitments, Guarantees and Contingencies (Textuals)
Commitments Guarantees And Contingencies Textuals [Abstract]
Commitments, Guarantees and Contingencies.
Revolving Credit Facilities
Letters of Credit Limit
Line of Credit Facility, Maximum Borrowing Capacity
Uncommitted Facility
Uncommitted Facility
Amount of letters of credit drawn on an uncommitted credit facility.
Guarantees of Mine Reclamation, Amount
Total Amount Collected through a Rider for Final Mine Closure and Reclamation Costs
Amount Collected through a Rider for Final Mine Closure - ARO Noncurrent
Maximum Potential Amount of Future Payments Associated with Guarantee
Maximum Potential Amount of Future Payments Associated with Guarantee
Maximum Potential Amount of Future Payments Associated with Guarantee
Cost of Decommissioning and Disposal of Radioactive Waste
Cost of decommissioning and disposal of radioactive waste
Cost of decommissioning and disposal of radioactive waste.
Additional Ongoing Costs for Post Decommissioning Storage of SNF
Additional Ongoing Costs for Post Decommissioning Storage of SNF
Additional Ongoing Costs for Post Decommissioning Storage of SNF
Subsequent Decommissioning of the Spent Fuel Storage Facility
Subsequent Decommissioning of the Spent Fuel Storage Facility
Subsequent Decommissioning of the Spent Fuel Storage Facility
Amount Recovered in Rates for Decommissioning Costs
Amount Recovered In Rates For Decommissioning Costs
Amount recovered in rates for decommissioning costs.
Decommissioning Fund Investments, Fair Value
Decommissioning Fund Investments, Fair Value
DOE SNF Disposal Fee
DOE SNF Disposal Fee
Department of Energy disposal fee collect from nuclear plant owners for Spend Nuclear Fuel. On November 19, 2013 the U.S. Court of Appeals for the D.C. circuit directed the reduction of the ongoing fee to zero.
Disposal, Assessed Fees and Related Interest
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.
Recovery of Spent Nuclear Fuel Storage Costs
Spent Nuclear Fuel Storage Costs Recovery
Recovery of certain spent nuclear fuel dry cask storage costs incurred as a result of the government's delays in accepting SNF for permanent storage.
Current Amount Recoverable from the Federal Government
Settlement Amount Recoverable For Dry Cask Current
Amount expected to be recovered from a governmental agency within one year for settlement of spent fuel disposal litigation.
Noncurrent Amount Recoverable from the Federal Government
Settlement Amount Recoverable For Dry Cask Noncurrent
Amount expected to be recovered from a governmental agency beyond one year for settlement of spent fuel disposal litigation.
Insurance Coverage for Property Damage, Decommissioning and Decontamination
Insurance Coverage For Property Damage Decommissioning And Decontamination
Insurance coverage for property damage, decommissioning and decontamination.
Coverage for Property Damage, Decommissioning and Decontamination for a Nonnuclear Incident
Nonnuclear incident coverage for property damage decommissioning and decontamination
Insurance coverage for property damage, decommissioning and decontamination for a nonnuclear incident.
Contingent Financial Obligation for Mutual Insurance
Contingent financial obligation for mutual insurance
Contingent financial obligation for mutual insurance.
Insurance Protection for Public Liability Arising from a Nuclear Incident
Insurance protection for public liability arising from nuclear incident
Insurance protection for public liability arising from a nuclear incident.
Commercially Available Insurance
Commercially available insurance
Commercially available insurance.
Assessed Amount per Nuclear Incident
Assessed amount per nuclear incident
Assessed amount per nuclear incident.
Deferred Premium Assessment Annual Payment
Deferred premium assessment annual payment
Deferred premium assessment annual payment.
Commercially Available Insurance for Catastrophic Nature
Commercially available insurance for catastrophic nature
Commercially available insurance for catastrophic nature.
Liability Coverage Under the Price-Anderson Act
Liability coverage under Price Anderson Act
Liability coverage under the Price-Anderson Act.
Payments for Environmental Liabilities
Payments for Environmental Liabilities
Regulation Status [Axis]
Regulation Status [Axis]
Regulated and Unregulated Operation [Domain]
Regulated and Unregulated Operation [Domain]
Regulated Operation [Member]
Regulated Operation [Member]
Unregulated Operation [Member]
Unregulated Operation [Member]
Conesville Generating Station (Unit No. 4) [Member]
Conesville Generating Station (Unit No. 4) [Member]
Conesville Generating Station (Unit No. 4) Member
J.M. Stuart Generating Station [Member]
Jm Stuart Generating Station [Member]
J.M. Stuart Generating Station member
Wm. H. Zimmer Generating Station [Member]
Wm. H. Zimmer Generating Station [Member]
Wm. H. Zimmer Generating Station Member
Dolet Hills Generating Station (Unit No. 1) [Member]
Flint Creek Generating Station (Unit No. 1) [Member]
Flint Creek Generating Station (Unit No. 1) [Member]
Flint Creek Generating Station (Unit No. 1) Member
Pirkey Generating Station (Unit No. 1) [Member]
Pirkey Generating Station (Unit No. 1) [Member]
Pirkey Generating Station (Unit No. 1) Member
Oklaunion Generating Station (Unit No. 1) [Member]
Turk Generating Plant [Member]
Turk Generating Plant [Member]
Turk Generating Plant Member
Functional Class of Property [Axis]
Functional Class of Property [Axis]
Functional Class of Property - including Generation, Transmission, Distribution and Other
Functional Class of Property [Domain]
Functional Class of Property [Domain]
Functional Class of Property
Generation [Member]
Electricity, Generation [Member]
Transmission [Member]
Distribution [Member]
Distribution [Member]
Distribution Member
Other Property Class [Member]
Other Property Class [Member]
Other Property Class
Inventory [Axis]
Inventory [Axis]
Inventory [Domain]
Inventory [Domain]
Coal [Member]
Coal [Member]
Public Utilities, Inventory, Lignite [Member]
Public Utilities, Inventory, Lignite [Member]
A soft brownish coal between bituminous coal and peat, which is extracted from the ground and used as fuel.
Depreciation, Depletion and Amortization
Depreciation, Depletion And Amortization [Abstract]
Depreciation, Depletion and Amortization.
Property, Plant and Equipment, Generation
Property, Plant and Equipment, Transmission
Public Utilities, Property, Plant and Equipment, Transmission
Property, Plant and Equipment, Distribution
Public Utilities, Property, Plant and Equipment, Distribution
Property, Plant and Equipment, Other
Property, Plant and Equipment, Construction Work in Progress
Accumulated Depreciation
Annual Composite Depreciation Rate
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service
Depreciable Life Ranges - Generation
Public Utilities, Property, Plant and Equipment, Generation, Useful Life
Depreciable Life Ranges - Transmission
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life
Depreciable Life Ranges - Distribution
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life
Depreciable Life Ranges - Other
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life
Asset Retirement Obligations (ARO)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance
Asset Retirement Obligation
Accretion Expense
Asset Retirement Obligation, Accretion Expense
Liabilities Incurred
Asset Retirement Obligation, Liabilities Incurred
Liabilities Settled
Asset Retirement Obligation, Liabilities Settled
Revisions in Cash Flow Estimates
Asset Retirement Obligation, Revision of Estimate
Ending Balance
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization
Public Utilities, Allowance for Funds Used During Construction, Net Increase [Abstract]
Allowance for Borrowed Funds Used During Construction
Allowance for Funds Used During Construction, Capitalized Interest
Jointly-owned Electric Facilities
Jointly Owned Electric Facilities [Abstract]
Jointly-owned Electric Facilities.
Percent of Ownership
Utility Plant in Service
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service
Construction Work in Progress
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress
Accumulated Depreciation
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation
Property, Plant and Equipment (Textuals)
Property, Plant and Equipment (Textuals) [Abstract]
Property Plant And Equipment Textuals Abstract.
Asset Retirement Obligations (ARO) Liability for Nuclear Decommissioning of the Cook Plant
Decommissioning Liability, Noncurrent
Fair Value of Legally Restricted Assets
Asset Retirement Obligation, Legally Restricted Assets, Fair Value
Benefit Plans
Pension and Other Postretirement Benefits Disclosure [Text Block]
New Accounting Pronouncements
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]
Property, Plant and Equipment
Property, Plant and Equipment [Table Text Block]
Depreciation, Depletion and Amortization - Regulated
Depreciation, Depletion and Amortization - Regulated [Table Text Block]
Regulated depreciation, depletion and amortization.
Depreciation, Depletion and Amortization - Unregulated
Depreciation, Depletion and Amortization - Unregulated [Table Text Block]
Unregulated depreciation, depletion and amortization.
Asset Retirement Obligation (ARO)
Schedule of Change in Asset Retirement Obligation [Table Text Block]
Allowance For Equity Funds Used During Construction
Allowance For Equity Funds Used During Construction [Table Text Block]
Allowance for equity funds used during construction.
Allowance For Borrowed Funds Used During Construction
Allowance For Borrowed Funds Used During Construction [Table Text Block]
Allowance for borrowed funds used during construction including capitalized interest.
Jointly-owned Electric Facilities
Schedule of Jointly Owned Utility Plants [Table Text Block]
Lease Policy
Lessee, Leases [Policy Text Block]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance Units and Reinvested Dividends on Outstanding Performance Units
Performance units and reinvested dividends on outstanding performance units [Text Block]
Tabular disclosure of the number and weighted-average grant date fair value for performance units and career shares that were outstanding at the beginning and end of the year and the vesting period.
Summary of Performance Scores and Performance Units Earned
Summary Of Performance Scores And Performance Units Earned [Text Block]
Tabular disclosure of performance scores and performance units earned, deferred and paid.
Summary of Cash Payouts for Performance Units and Career Shares
Summary Of Cash Payouts For Performance Units And Career Shares [Text Block]
Tabular disclosure of cash payouts for performance units and career shares.
Status of Nonvested Performance Units
Share-based Compensation Arrangements by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding [Table Text Block]
Monte Carlo Valuation Assumptions
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Summary of Units Awarded and Fair Value of Restricted Stock Units
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
Total Fair Value and Total Intrinsic Value of Restricted Shares and Restricted Stock Units Vested
Total fair value and total intrinsic value of restricted shares and restricted stock units vested [Text Block]
Tabular disclosure of the total intrinsic value of restricted shares and restricted stock units vested, and the total fair value of restricted shares and restricted stock units vested during the year.
Status of Nonvested Restricted Shares and Restricted Stock Units
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]
Stock Unit Accumulation Plan for Non-employee Directors
Share-based Payment Arrangement, Nonemployee Director Award Plan, Activity [Table Text Block]
Compensation Cost and Actual Tax Benefit Realized for Tax Deductions from Compensation Cost for Share-based Payment Arrangements
Share-based Payment Arrangement, Cost by Plan [Table Text Block]
Derivatives and Hedging
Derivatives, Policy [Policy Text Block]
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information
Quarterly Financial Information [Table Text Block]
Reclassification out of Accumulated Other Comprehensive Income [Axis]
Reclassification out of Accumulated Other Comprehensive Income [Axis]
Reclassification out of Accumulated Other Comprehensive Income [Domain]
Reclassification out of Accumulated Other Comprehensive Income [Domain]
Reclassifications from Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Member]
Purchased Electricity for Resale [Member]
Electricity, Purchased [Member]
Derivative Instrument [Axis]
Derivative Instrument [Axis]
Derivative Contract [Domain]
Derivative Contract [Domain]
Commodity [Member]
Commodity Contract [Member]
Interest Rate [Member]
Interest Rate [Member]
Interest Rate Member.
Securities Available for Sale [Member]
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Pension and OPEB [Member]
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Pension and OPEB Activity [Axis]
Pension and OPEB Activity [Axis]
Pension and OPEB activity.
Pension and OPEB Activity [Domain]
Pension and OPEB Activity [Domain]
Pension and OPEB activity.
Amortization of Deferred Costs [Member]
Amortization of Deferred Costs [Member]
Amortization of Deferred Costs on pension and OPEB in Comprehensive Income.
Changes in Funded Status [Member]
Changes in Funded Status [Member]
Changes in funded status on Pension and OPEB in Comprehensive Income.
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 (Loss)
Reclassifications From Accumulated Other Comprehensive Income [Abstract]
Gains and Losses on Cash Flow Hedges
Gains And Losses On Cash Flow Hedges [Abstract]
Commodity
Commodity [Abstract]
Commodity.
Generation and Marketing Revenues
Purchased Electricity for Resale
Cost of Goods and Services Sold
Interest Rate
Interest Rate [Abstract]
Pension and OPEB
Amortization Of Pension And Other Postretirement Benefit Plans [Abstract]
Amortization of Prior Service Cost (Credit)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax
Amortization of Actuarial (Gains) Losses
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax
Reclassifications from AOCI, before Income Tax (Expense) Benefit
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax
Income Tax (Expense) Benefit
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax
Net Current Period Other Comprehensive Income (Loss)
Ending Balance in AOCI
AEP Texas Interim Transmission and Distribution Rates [Member]
AEP Texas Interim Transmission and Distribution Rates [Member]
AEP Texas Interim Transmission and Distribution Rates [Member]
ETT Interim Transmission Rates [Member]
ETT Interim Transmission Rates [Member]
ETT Interim Transmission Rates [Member]
2018 Oklahoma Base Rate Case [Member]
2018 Oklahoma Base Rate Case [Member]
2018 Oklahoma Base Rate Case [Member]
2012 Texas Base Rate Case [Member]
2012 Texas Base Rate Case [Member]
2012 Texas Base Rate Case [Member]
2016 Texas Base Rate Case [Member]
2016 Texas Base Rate Case [Member]
2016 Texas Base Rate Case [Member]
Louisiana 2018 Formula Rate Filing [Member]
Louisiana 2018 Formula Rate Filing [Member]
Louisiana 2018 Formula Rate Filing [Member]
Welsh Plant, Units 1 And 3 - Environmental Projects [Member]
Welsh Plant Units 1 And 3 Environmental Projects [Member]
Welsh Plant Units 1 And 3 Environmental Projects [Member]
2019 Arkansas Base Rate Case [Member]
2019 Arkansas Base Rate Case [Member]
2019 Arkansas Base Rate Case [Member]
FERC Transmission Complaint - AEP SPP Participants [Member]
FERC Transmission Complaint - AEP SPP Participants [Member]
FERC Transmission Complaint - AEP SPP Participants
Welsh Plant, Units 1 and 3 [Member]
Welsh Plant Unit 1 and 3 [Member]
Welsh Plant Unit 1 and 3 [Member]
Capital Incentives [Member]
Capital Incentives [Member]
Capital Incentives [Member]
Other Plant Additions [Member]
Other Plant Additions [Member]
Other Plant Additions [Member]
Capital Investments [Member]
Capital Investments [Member]
Capital Investments [Member]
Rate Case Expense [Member]
Rate Case Expense [Member]
Rate Case Expense.
Vegetation Management [Member]
Amount of 2019 Investments [Member]
Amount of 2019 Investments [Member]
Amount of 2019 Investments [Member]
Approved Item [Axis]
Approved Item [Axis]
Approved Item [Axis]
Approved Item [Domain]
Approved Item [Domain]
[Domain] for Approved Item [Axis]
Refund Item [Axis]
Refund Item [Axis]
Refund Item [Axis]
Refund Item [Domain]
Refund Item [Domain]
[Domain] for Refund Item [Axis]
Excess ADIT and Excess Federal Income Taxes to Distribution Customers [Member]
Excess ADIT and Excess Federal Income Taxes to Distribution Customers [Member]
Excess ADIT and Excess Federal Income Taxes to Distribution Customers [Member]
Excess ADIT and Excess Federal Income Taxes to Transmission Customers [Member]
Excess ADIT and Excess Federal Income Taxes to Transmission Customers [Member]
Excess ADIT and Excess Federal Income Taxes to Transmission Customers [Member]
Previously Collected Rates Subject to Reconciliation [Member]
Previously Collected Rates Subject to Reconciliation [Member]
Previously Collected Rates Subject to Reconciliation [Member]
Financial Instrument [Axis]
Financial Instrument [Axis]
Financial Instruments [Domain]
Financial Instruments [Domain]
Debt [Member]
Debt [Member]
Income Tax Authority [Axis]
Income Tax Authority [Axis]
Income Tax Authority [Domain]
Income Tax Authority [Domain]
AEP Texas Cumulative Revenues Subject to Review
AEP Texas Cumulative Revenues Subject to Review
AEP Texas cumulative revenues, subject to review, based upon interim rate increases received from 2009 through 2016.
ALJ Recommended Annual Decrease
ALJ Recommended Annual Decrease
Decrease in rates recommended by ALJ.
ALJ Recommended Return on Common Equity
ALJ Recommended Return on Common Equity
Increase in common equity recommended by ALJ
Recommended Disallowance from ALJ
Recommended Disallowance from ALJ
Recommended disallowance from ALJ in current case.
Settlement Agreement Annual Decrease
Settlement Agreement Annual Decrease
The annual decrease in revenue as agreed up in the settlement agreement.
Excess ADIT
Excess ADIT
Amount of Excess ADIT used to offset total estimated distribution-related system restoration costs requested in securitization filing.
Texas Restoration Carrying Costs
Texas Restoration Carrying Costs
Total carrying costs for Texas Restoration securitized bonds.
Debt Carrying Costs Recorded as Reduction to Interest Expense
Debt Carrying Costs Recorded as Reduction to Interest Expense
Amount of debt carrying costs recorded as reduction to interest expense in securitization filing.
Transmission Related Assets to be Recovered at a Later Time
Transmission Related Assets to be Recovered at a Later Time
Total amount of Transmission Related Assets to be recovered at a later time.
Parent Ownership Interest In ETT
Parent Ownership Interest In ETT
Parents equity ownership interest in ETT.
AEP Share Of ETT Cumulative Revenues Subject To Review
AEP Share Of ETT Cumulative Revenues Subject To Review
AEP's share of ETT's cumulative revenues, subject to review, based upon interim rate increases received from 2009 through 2015.
Refund for Excess ADIT
Refund for Excess ADIT
Amount of refund to be given through rate reductions, riders, etc related to Excess ADIT.
Amount of Increase Related to Increased Storm Expense Amortization
Amount of Increase Related to Increased Storm Expense Amortization
Amount of requested increase related to the increase in storm expense amortization.
Approved Annual Revenue Increase - Net
Approved Annual Revenue Increase - Net
The approved annual revenue increase net of current riders.
Disallowed Item in Commission Order
Disallowed Item in Commission Order
An item that is disallowed in a commission order.
Approved Increase in Annual Depreciation Expense
Approved Increase in Annual Depreciation Expense
Amount of increase annual depreciation expense that is approved in an order.
Revenue Cap on New Distribution Reliability and Safety Rider
Revenue Cap on New Distribution Reliability and Safety Rider
Amount of the revenue cap on the new distribution reliability and safety rider.
2013 Reversal Of Previously Recorded Regulatory Disallowances
2013ReversalOfPreviouslyRecordedRegulatoryDisallowances
The 2013 reversal of previously recorded regulatory disallowances.
Resulting Approved Base Rate Increase
Resulting Approved Base Rate Increase
The resulting annual base rate increase subsequent to recent rulings.
Property, Plant and Equipment, Net
Public Utilities, Property, Plant and Equipment, Net
Texas Jurisdictional Share of Turk Plant
Texas Jurisdictional Share of Turk Plant
Texas jurisdictional share of the Turk Plant
Requested Net Increase in Texas Annual Revenues
Requested Net Increase in Texas Annual Revenues
Requested net increase in Texas annual revenues.
Approved Net Increase in Texas Annual Revenues
Approved Net Increase in Texas Annual Revenues
Net Increase in approved Texas Annual Revenues
Approved Additional Vegetation Management Expenses
Approved Additional Vegetation Management Expenses
Increase in approved additional vegetation management expenses
Impairment Charge Total
Impairment Charge Total
Total impairment charge recorded as part of agreement.
Impairment Charge Welsh Plant, Unit 2
Impairment Charge Welsh Plant, Unit 2
Impairment recorded due to lack of return on Welsh Plant Unit 2.
Impairment Charge Disallowed Plant Investments
Impairment Charge Disallowed Plant Investments
Impairment Charge recorded to recognize disallowed plant investments.
Additional Revenues Recognized to be Surcharged to Customers
Additional Revenues Recognized to be Surcharged to Customers
Increase in revenues recognized to be surcharged to customers
Additional Recognized Expenses Consisting Primarily of Depreciation and Vegetation Management
Additional Recognized Expenses Consisting Primarily of Depreciation and Vegetation Management
Increase in recognized expenses consisting primarily of depreciation and vegetation management
Adjusted Requested Annual Increase
Adjusted Requested Annual Increase
Adjusted annual increase request due to various factors such as true up of historical information.
Refund for Current Year Tax Reform Rate Change
Refund for Current Year Tax Reform Rate Change
Amount of refund to be given through rate reductions, riders, etc related to over-collection of current year taxes as a result of Tax Reform.
Additional Refund for Current Year Tax Reform Rate Change
Additional Refund for Current Year Tax Reform Rate Change
Additional refund for current year tax reform rate change as recommended by staff.
Staff Recommended Annual Rate Increase
Staff Recommended Annual Rate Increase
The staff's recommended annual rate increase.
Settlement Agreement Return on Common Equity
Settlement Agreement Return on Common Equity
The return on common equity as agreed upon in the settlement agreement.
Settlement Agreement Capital Structure
Settlement Agreement Capital Structure
Capital Structure as agreed to in a settlement agreement.
Settlement Agreement Approved for Recovery
Settlement Agreement Approved for Recovery
Items that are agreed to be approved for recovery within a settlement agreement.
Settlement Agreement Disallowance
Settlement Agreement Disallowance
Items that were disallowed as part of a settlement agreement.
Settlement Agreement Refund to Customers
Settlement Agreement Refund to Customers
Amount of refund to customers as agreed to in a settlement agreement.
Write-off of Regulatory Expense
Write-off of Regulatory Expense
Write-off of regulatory expense due to a disallowance.
Total Amount of Welsh Environmental Project Approved For Recovery
Total Amount of Welsh Environmental Project Approved For Recovery
The total amount of Welsh Environmental Project approved for recovery within all of SWEPCo's jurisdictions.
Requested Annual Net Increase
Requested Annual Net Increase
Requested annual net increase in rates
Requested Additional Vegetation Management Expenses
Requested Additional Vegetation Management Expenses
Amount of additional vegetation management expenses requested
Income Statement [Abstract]
Transmission and Distribution Utilities [Member]
Fuel and Other Consumables Used for Electric Generation [Member]
Revenues
Revenues [Abstract]
Other Revenues - Affiliated
Related Party Transaction, Other Revenues from Transactions with Related Party
TOTAL REVENUES
Expenses
Operating Expenses [Abstract]
Cost of Goods and Services Sold
Purchased Electricity from AEP Affiliates
Other Operation
Utilities Operating Expense, Operations
Maintenance
Utilities Operating Expense, Maintenance
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]
Other Income
Other Nonoperating Income (Expense)
Non-Service Cost Components of Net Periodic Benefit Cost
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component
Gain on Sale of Equity Investment
Gain (Loss) on Disposition of Stock in Subsidiary or Equity Method Investee
Interest Expense
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest
Net Income Attributable to Noncontrolling Interests
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS
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
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
TOTAL DILUTED EARNINGS PER SHARE ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS
Earnings Per Share, Diluted
Equity units [Member]
Equity units [Member]
Equity units issued by AEP in March 2019
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
Equity Securities [Member]
Equity Securities [Member]
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]
Trust Assets [Axis]
Trust Assets [Axis]
Trust Assets [Axis]
Trust Assets [Domain]
Trust Assets [Domain]
[Domain] for Trust Assets [Axis]
Spent Nuclear Fuel and Decommissioning Trusts [Member]
Spent Nuclear Fuel and Decommissioning Trusts [Member]
Spent Nuclear Fuel and Decommissioning Trusts.
Unrealized Gain on Securities
Unrealized Gain on Securities
Unrealized Loss on Securities
Unrealized Loss on Securities
Book Values and Fair Values of Long - term Debt
Long-term Debt, Other Disclosures [Abstract]
Total Long-term Debt Outstanding
Long-term Debt, Fair Value
Long-term Debt, Fair Value
Other Temporary Investments
Short-term Investments [Abstract]
Cost
Investment Owned, at Cost
Gross Unrealized Gains
Investment Owned, Unrecognized Unrealized Appreciation
Gross Unrealized Losses
Investment Owned, Unrecognized Unrealized Depreciation
Fair Value
Other Short-term Investments
Debt and Equity Securities Within Other Temporary Investments
Debt and Equity Securities Within Other Temporary Investments [Abstract]
Activity for our debt and equity securities within Other Temporary Investments.
Proceeds From Investment Sales
Proceeds from Sale of Short-term Investments
Purchases of Investments
Payments to Acquire Short-term Investments
Gross Realized Gains on Investment Sales
Gross Realized Gains on Investment Sales On Short Term Investment
Gross Realized Gains on Investment Sales On Short Term Investment.
Gross Realized Losses on Investment Sales
Gross Realized Losses On Investment Sales On Short Term Investment
Gross Realized Losses On Investment Sales On Short Term Investment.
Nuclear Trust Fund Investments
Nuclear Trust Fund Investments [Abstract]
Nuclear trust fund investments.
Fair Value
Spent Nuclear Fuel And Decommissioning Trusts
Funds to pay for the disposal of spent nuclear fuel and the decontaminating and decommissioning of nuclear facilities through the collection of revenues from rate payers.
Gross Unrealized Gains
Available-for-sale Securities, Gross Unrealized Gain
Other-Than-Temporary Impairments
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities
Securities Activity Within the Decommissioning and SNF Trusts
Securities Activity Within Decommissioning and SNF Trusts [Abstract]
Securities Activity Within Decommissioning And Snf Trusts.
Proceeds from Investment Sales
Proceeds from Sale of Available-for-sale Securities
Purchases of Investments
Payments to Acquire Available-for-sale Securities
Gross Realized Gains on Investment Sales
Available-for-sale Securities, Gross Realized Gains
Gross Realized Losses on Investment Sales
Available-for-sale Securities, Gross Realized Losses
Contractual Maturities, Fair Value of Debt Securities
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Within 1 year
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value
After 1 year through 5 years
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value
After 5 years through 10 years
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value
After 10 years
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value
Fair Value Measurements (Textuals)
Fair Value Measurements (Textuals) [Abstract]
Fair Value Measurements Textuals Abstract
Adjusted Cost of Debt Securities
Adjusted cost of debt securities
Adjusted cost of debt securities.
Adjusted Cost of Domestic Equity Securities
Adjusted Cost Of Equity Securities
Adjusted cost of equity securities within the nuclear trusts
Public Utilities, General Disclosures [Abstract]
Rate Matters
Public Utilities Disclosure [Text Block]
Property, Plant and Equipment
Depreciation, Depletion, and Amortization [Policy Text Block]
Asset Retirement Obligations
Asset Retirement Obligation and Environmental Cost [Policy Text Block]
Defined Benefit Plan, Plan Assets, Category [Axis]
Defined Benefit Plan, Plan Assets, Category [Axis]
Defined Benefit Plan, Plan Assets, Category [Domain]
Defined Benefit Plan, Plan Assets, Category [Domain]
Equity Securities [Member]
Defined Benefit Plan, Equity Securities [Member]
Domestic [Member]
Defined Benefit Plan, Equity Securities, US [Member]
International [Member]
Defined Benefit Plan, Equity Securities, Non-US [Member]
Options [Member]
Equity Option [Member]
Common Collective Trusts [Member]
Defined Benefit Plan, Common Collective Trust [Member]
Fixed Income [Member]
Fixed Income Securities [Member]
Common Collective Trust - Debt [Member]
Common Collective Trust - Debt [Member]
Common Collective Trust - Debt.
United States Government and Agency Securities [Member]
US Treasury and Government [Member]
Foreign Debt [Member]
Foreign Debt [Member]
Foreign Debt [Member]
State and Local Government [Member]
US States and Political Subdivisions Debt Securities [Member]
Other - Asset Backed [Member]
Asset-backed Securities [Member]
Infrastructure [Member]
Infrastructure [Member]
Infrastructure.
Real Estate [Member]
Defined Benefit Plan, Real Estate [Member]
Alternative Investments [Member]
Alternative Investments [Member]
Alternative Investments.
Trusted Owned Life Insurance [Member]
Trusted Owned Life Insurance [Member]
Trusted Owned Life Insurance Member
International Equities [Member]
International Equities [Member]
International Equities [Member]
United States Bonds [Member]
US Treasury Bond Securities [Member]
Cash and Cash Equivalents [Member]
Defined Benefit Plan, Cash and Cash Equivalents [Member]
Other - Pending Transactions and Accrued Income [Member]
Other Pending Transactions and Accrued Income [Member]
Other Pending Transactions and Accrued Income.
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Domain]
Fair Value Hierarchy and NAV [Domain]
Level 1 [Member]
Fair Value, Inputs, Level 1 [Member]
Level 2 [Member]
Fair Value, Inputs, Level 2 [Member]
Level 3 [Member]
Fair Value, Inputs, Level 3 [Member]
Measurement Basis [Axis]
Measurement Basis [Axis]
Fair Value Measurement [Domain]
Fair Value Measurement [Domain]
Portion at Fair Value Measurement [Member]
Portion at Fair Value Measurement [Member]
Other [Member]
Portion at Other than Fair Value Measurement [Member]
Pension Plan [Member]
Allocated Assets of Investments
Allocated Assets of Investments
Percentage of investments that are allocated to the Registrant Subsidiary.
Pension and Other Postretirement Plans' Assets
Defined Benefit Plan, Information about Plan Assets [Abstract]
Asset Class
Year End Allocation
Pension and Other Postretirement Plans Assets Percentage [Abstract]
Pension and Other Postretirement Plans' Assets Percentage.
Total
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage
Transmission And Distribution Utilities [Member]
Other Segments [Member]
Consolidation Eliminations [Member]
Retail [Member]
Retail [Member]
Residential [Member]
Residential [Member]
Retail revenues from the residential class.
Commercial [Member]
Commercial [Member]
Retail revenues from the commercial class.
Industrial [Member]
Industrial [Member]
Retail revenues from the industrial class.
Other Retail [Member]
Other Retail [Member]
Revenues from retail classes other than residential, commercial and industrial.
Wholesale and Competitive [Member]
Wholesale and Competitive [Member]
Revenues related to wholesale and competitive sales.
Wholesale Generation [Member]
Wholesale Generation [Member]
Wholesale Generation.
Wholesale Transmission [Member]
Wholesale Transmission [Member]
Wholesale Transmission.
Renewable Generation [Member]
Renewable Generation [Member]
Renewable Generation
Retail, Trading and Marketing Revenue [Member]
Marketing, Competitive Retail and Renewable [Member]
Marketing, Competitive Retail and Renewable [Member]
Other Revenues [Member]
Other Revenues - Affiliated and Nonaffiliated [Member]
Other Revenues - Affiliated and Nonaffiliated.
Affiliated and Nonaffiliated [Member]
Affiliated and Nonaffiliated [Member]
Includes affiliated and nonaffiliated revenues.
Alternative and Other [Member]
Alternative and Other [Member]
Alternative and Other [Member]
Alternative [Member]
Alternative [Member]
Alternative [Member]
Recognition Period [Axis]
Recognition Period [Axis]
Recognition Period [Axis]
Recognition Period [Domain]
Recognition Period [Domain]
[Domain] for Recognition Period [Axis]
2020 [Member]
Less Than 1 Year [Member]
Time period in which fixed performance obligations will be satisfied.
2021-2022 [Member]
2-3 Years [Member]
Time period in which fixed performance obligations will be satisfied.
2023-2024 [Member]
4-5 Years [Member]
Time period in which fixed performance obligations will be satisfied.
After 2024 [Member]
After 5 Years [Member]
Time period in which fixed performance obligations will be satisfied.
Contract with Customer, Duration [Axis]
Contract with Customer, Duration [Axis]
Contract with Customer, Duration [Domain]
Contract with Customer, Duration [Domain]
Short-term Contract with Customer [Member]
Short-term Contract with Customer [Member]
Disaggregation of Revenue
Disaggregation of Revenue [Abstract]
Revenue, Performance Obligation
Revenue, Performance Obligation [Abstract]
Fixed Performance Obligations
Revenue, Remaining Performance Obligation, Amount
Affiliated Companies - Contracts with Customers
Accounts Receivable, Related Parties, Current
Revenue Textuals
Revenue Textuals [Abstract]
Revenue Textuals Abstract.
Revenue from Related Parties
Revenues
Mutual Funds Equity [Member]
Mutual Fund [Member]
Corporate Debt Securities [Member]
State and Local Jurisdiction [Member]
Hedging Relationship [Axis]
Hedging Relationship [Axis]
Hedging Relationship [Domain]
Hedging Relationship [Domain]
Risk Management Commodity Contracts [Member]
Risk Management Commodity Contracts [Member]
Risk Management Contracts Member.
Energy Contracts [Member]
Energy Contracts [Member]
Risk management commodity contracts whose primary underlying risk is tied energy contracts.
Natural Gas Contracts [Member]
Natural Gas Contract [Member]
Nominal energy measure used to calculate payments on a derivative instrument.
FTRs [Member]
Financial Trasnsmission Rights [Member]
Risk management commodity contracts whose primary underlying risk is tied financial transmission rights.
Commodity Hedges [Member]
Commodity [Member]
Interest Rate 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 Abstract [Axis]
Maturity Year [Domain]
Maturity Year [Domain]
2019 [Member]
Maturity Period One [Member]
2020 [Member]
Maturity Period Two [Member]
2020 - 2022 [Member]
Maturity Period Three [Member]
2021 - 2023 [Member]
Maturity Period Four [Member]
2023 - 2024 [Member]
Maturity Period 5 [Member]
2024-2025 [Member]
Maturity Period Six [Member]
2025 - 2032 [Member]
Maturity Period Seven [Member]
2026 - 2032 [Member]
Maturity Period Eight [Member]
Maturity Period Eight.
Low [Member]
High [Member]
Weighted Average [Member]
Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Assets, Fair Value Disclosure
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents
Cash and Cash Equivalents, Fair Value Disclosure
Other Temporary Investments
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, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss)
Settlements
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases, Sales, Issues, Settlements
Transfers into Level 3
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3
Transfers out of Level 3
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3
Changes in Fair Value Allocated to Regulated Jurisdiction
Changes in Fair Value Allocated to Regulated Jurisdiction
This element represents total gains or losses for the period (realized and unrealized), arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are allocated to regulated jurisdictions.
Ending Balance
Level 3 Quantitative Information
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Fair Value Significant Unobservable Input Price Per Unit
Fair Value Significant Unobservable Input Price Per Unit
Price per unit of significant unobservable inputs, such as but not limited to fair value for financial transmission rights agreements and energy contracts.
Fair Value Measurements 1 (Textuals)
Fair Value Measurements 1 (Textuals) [Abstract]
Fair value measurements textuals abstract for assets and liabilities measured on a recurring basis.
Maturity Of Net Fair Value Of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities
Maturity Of Net Fair Value Of Risk Management Contracts Prior To Cash Collateral Assets Or Liabilities
Maturity of the net fair value of risk management contracts prior to cash collateral, assets or liabilities.
Variable Interest Entities
Variable Interest Entity Disclosure [Text Block]
Details of Income Taxes as Reported
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Reconciliation of Federal Statutory Tax Rate to Reported Tax Rate
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Reconciliation of Significant Temporary Differences
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
State Net Income Tax Operating Loss Carryforwards
Summary of Operating Loss Carryforwards [Table Text Block]
Summary of Tax Credit Carryforwards
Summary of Tax Credit Carryforwards [Table Text Block]
Reconciliation of Beginning and Ending Unrecognized Tax Benefits
Summary of Income Tax Contingencies [Table Text Block]
Unrecognized Tax Benefits Affecting Effective Tax Rate
Unrecognized Tax Benefits That Would Impact Effective Tax Rate [Table Text Block]
Tabular disclosure of the total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.
Noncontrolling Interest [Member]
Revenues [Member]
Operating Revenue [Member]
Percentage of Risk associated with Operating Revenue.
Accounts Receivable [Member]
Accounts Receivable [Member]
Restricted Stock Units and Performance Share Units [Member]
Restricted Stock Units and Performance Share Units [Member]
Pension and Other Postretirement Benefit Plans [Member]
Postemployment Retirement Benefits [Member]
Other Investments [Member]
Other Investments [Member]
Debt Instrument [Axis]
Debt Instrument [Axis]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Investment, Name [Axis]
Investment, Name [Axis]
Investment, Name [Domain]
Investment, Name [Domain]
Materials and Supplies
Securities Loaned
Securities Loaned
Cash, Cash Equivalents and Restricted Cash
Cash, Cash Equivalents and Restricted Cash [Abstract]
Cash, Cash Equivalents and Restricted Cash [Abstract]
Supplementary Information
Supplementary Information [Abstract]
Supplementary Information.
Related Party Transactions
AEP Consolidated Revenues - Other Revenues:
Parent Companys Consolidated Revenues Other Revenues [Abstract]
Parent Companys Consolidated Revenues Other Revenues.
Ohio Valley Electric Corporation - Barging and Other Transportation Services (43.47% Owned)
Supplemental Income Statement Elements
Supplemental Income Statement Elements [Abstract]
Depreciation and Amortization of Property, Plant and Equipment
Depreciation
Amortization of Certain Securitized Assets
Amortization of Certain Securitized Assets
The expense charged against earnings during the period to allocate the capitalized costs of securitized assets over the periods expected to benefit from such costs.
Amortization of Regulatory Assets and Liabilities
Amortization of Regulatory Assets and Liabilities
The expense/income charged against earnings during the period to allocate the capitalized costs of regulatory assets/liabilities over the periods expected to benefit from such costs.
Utilities Operating Expense, Depreciation and Amortization
Cash Flow Information
Cash Paid (Received) for:
Cash Paid Received for [Abstract]
Cash Paid (Received) for.
Income Taxes Paid, Net
Construction in Progress Expenditures Incurred but Not yet Paid
Noncash Investing and Financing Activities:
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Lease Obligation Incurred
Lease Obligation Incurred
Construction Expenditures Included in Noncurrent Liabilities as of December 31,
Capital Expenditures Incurred but Not yet Paid
Noncash Contribution of Assets by Noncontrolling Interest
Noncontrolling Interest Assumed with Sempra Renewables LLC and Santa Rita East Acquisition
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed
Restricted Cash
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Risks and Uncertainties
Risks and Uncertainties [Abstract]
Percentage of Significant Customers Concentration Risk
Concentration Risk, Percentage
Target Asset Allocations
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target Asset Allocation
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage
Basic and Diluted EPS Calculations
Amounts Attributable to AEP Common Shareholders
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
Weighted Average Number of Basic AEP Common Shares Outstanding
Earnings Per Share, Basic
Weighted Average Dilutive Effect of:
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Weighted Average Dilutive Effect of Shares
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements
Dilutive Securities, Effect on Basic Earnings Per Share
Dilutive Securities 1
Includes adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.
Weighted Average Number of Diluted AEP Common Shares Outstanding
Earnings Per Share, Diluted
Supplementary Information
Income Statement
Revenues
Expenses
Depreciation and Amortization
TOTAL EXPENSES
Other Income (Expense)
Interest Expense
Assets
Assets [Abstract]
Accounts Receivable:
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]
Customers
Accounts Receivable, before Allowance for Credit Loss, Current
Total Accounts Receivable
Accounts Receivable, after Allowance for Credit Loss, Current
Accrued Tax Benefits
Income Taxes Receivable, Current
TOTAL CURRENT ASSETS
Assets, Current
Transmission
Deferred Property Taxes
Deferred Tax Assets, Property, Plant and Equipment
TOTAL OTHER NONCURRENT ASSETS
Assets, Noncurrent
TOTAL ASSETS
Liabilities
Liabilities [Abstract]
Accounts Payable
Accounts Payable, Current
Affiliated Companies
Accounts Payable, Related Parties, Current
Accrued Taxes
Taxes Payable, Current
TOTAL CURRENT LIABILITIES
Liabilities, Current
Liabilities, Noncurrent
Deferred Income Taxes
Deferred Tax Liabilities, Net, Noncurrent
Regulatory Liabilities and Deferred Investment Tax Credits
TOTAL NONCURRENT LIABILITIES
Liabilities, Noncurrent
TOTAL LIABILITIES
Liabilities
Equity [Abstract]
Equity [Abstract]
Retained Earnings
Retained Earnings (Accumulated Deficit)
TOTAL MEMBER'S EQUITY
TOTAL LIABILITIES AND EQUITY
Liabilities and Equity
Statement of Cash Flows
Deferred Income Taxes
Amortization of Deferred Property Taxes
Increase (Decrease) in Other Noncurrent Liabilities
Net Cash Provided by (Used in) Financing Activities
Organization and Summary of Significant Accounting Policies (Textuals)
Organization and Summary of Significant Accounting Policies Textuals [Abstract]
Organization and Summary of Significant Accounting Policies.
Equity Method Investment
Income (Loss) from Equity Method Investment
Antidilutive Shares Outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Net Income (Loss)
Fair Value, Inputs, Level 3 [Member]
Fair Value, Inputs, Level 2 [Member]
Maturity Of Fair Value Risk Management Contracts Abstract [Axis]
Maturity Period 5 [Member]
Maturity Period Eight [Member]
Maturity Period Seven [Member]
Vertically Integrated Utilities Revenues [Member]
Vertically Integrated Utilities Revenues [Member]
Vertically Integrated Utilities Revenues.
Electric Generation, Transmission and Distribution Revenues [Member]
Electric Generation Transmission Distribution Revenues [Member]
Electric Generation, Transmission and Distribution Revenues.
Purchased Electricity for Resale [Member]
Purchased Electricity for Resale [Member]
Purchased Electricity for Resale.
Other Operation Expense [Member]
Other Operation Expense [Member]
Other operation expense.
Maintenance Expense [Member]
Maintenance Expense [Member]
Maintenance expense.
Regulatory Liabilities [Member]
Regulatory Liabilities [Member]
Regulatory Liabilities.
Interest Rate [Member]
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member]
Gross Amounts of Risk Management Assets Liabilities Recognized [Member]
Gross Amounts of Risk Management Assets/Liabilities Recognized.
Gross Amounts Offset in the Statement of Financial Position [Member]
Gross Amounts Offset in Statement of Financial Position [Member]
Gross Amounts Offset in the Statement of Financial Position.
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member]
Net Amounts of Assets Liabilities Presented in Statement of Financial Position [Member]
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position.
Power [Member]
Power Contract Member [Member]
Nominal energy measure used to calculate payments on a derivative instrument.
Natural Gas [Member]
Heating Oil and Gasoline [Member]
Heating Oil And Gasoline Contract Member [Member]
Nominal volume used to calculate payments on a derivative instrument.
Interest Rate Contract [Member]
Interest Rate Contract [Member]
Risk Management Contracts [Member]
Hedging Contracts [Member]
Hedging Contracts [Member]
Maturity Of Net Fair Value Of Risk Management Contracts Prior To Cash Collateral Assets Or Liabilities
Change in Fair Value Recognized in AOCI
Notional Volume Of Derivative Instruments
Notional Volume Of Derivative Instruments [Abstract]
Notional Volume Of Derivative Instruments Abstract.
Derivative, Energy Notional Amount
Derivative Nonmonetary Energy Notional Amount
Volume of power derivatives 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
Derivative Asset, Current
Long-term Risk Management Assets
Derivative Asset, Noncurrent
Total Assets
Current Risk Management Liabilities
Derivative Liability, Current
Long-term Risk Management Liabilities
Derivative Liability, Noncurrent
Total Liabilities
Total MTM Derivative Contract Net Assets (Liabilities)
Derivative Assets (Liabilities), at Fair Value, Net
Amount of Gain (Loss) Recognized on Risk Management Contracts
Gain (Loss) on Derivative Instruments, Net, Pretax [Abstract]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Gain (Loss) on Derivative Instruments, Net, Pretax
Amount of Gain (Loss) Recognized on Risk Management Contracts
Derivative Risk Management Contracts Gain Loss Recognized As Regulatory Asset Liability
Realized and unrealized gains and losses subject to regulatory accounting treatment recorded as either current or noncurrent on the balance sheets.
Impact of Fair Value Hedges on the Balance Sheet
Impact of Fair Value Hedges on the Balance Sheet [Abstract]
Impact of Fair Value Hedges on the Balance Sheet.
Carrying Amount of Hedged Asset (Liability)
Carrying Amount of Hedged Asset (Liability)
Carrying Amount of Hedged Asset (Liability)
Cumulative Fair Value Hedging Adjustment in the Carrying Amount of the Hedged Asset (Liability)
Cumulative Fair Value Hedging Adjustment in the Carrying Amount of the Hedged Asset (Liability)
Cumulative Fair Value Hedging Adjustment in the Carrying Amount of the Hedged Asset (Liability)
Impact of Cash Flow Hedges on the Balance Sheet
Impact of Cash Flow Hedges on our Consolidated Balance Sheet [Abstract]
Impact of Cash Flow Hedges on our Consolidated Balance Sheet.
AOCI Gain (Loss) Net of Tax
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax
Portion Expected to be Reclassified to Net Income During the Next Twelve Months
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months
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.
Collateral Triggering Events
Collateral Triggering Events [Abstract]
Collateral Triggering Events Abstract.
Liabilities for Contracts with Cross Default Provisions Prior to Contractural Netting Arrangements
Fair Value Of Derivative Liabilities Subject To Cross Default Provisions
Fair value of derivative liabilities subject to cross-default provisions.
Amount of Cash Collateral Posted
Collateral Already Posted, Aggregate Fair Value
Additional Settlement Liability if Cross Default Provision is Triggered
Assets Needed for Immediate Settlement, Aggregate Fair Value
Derivatives and Hedging (Textuals)
Derivatives and Hedging Textuals [Abstract]
Derivatives and Hedging Textuals
Maximum Length of Time Hedged in Price Risk Cash Flow Hedge
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
Summary of Unaudited Quarterly Financial Information
Selected Quarterly Financial Information [Abstract]
Operating Income (Loss)
Amounts Attributable to Common Shareholders
Earnings (Loss) Attributable To Common Shareholders
Basic Earnings (Loss) per Share Attributable to AEP Common Shareholders:
Earnings Per Share, Basic [Abstract]
Basic Earnings (Loss) per Share Attributable to AEP Common Shareholders from Continuing Operations
Total Basic Earnings (Loss) per Share Attributable to AEP Common Shareholders
Diluted Earnings (Loss) per Share Attributable to AEP Common Shareholders:
Earnings Per Share, Diluted [Abstract]
Diluted Earnings (Loss) per Share Attributable to AEP Common Shareholders from Continuing Operations
Total Diluted Earnings (Loss) Per Share Attributable to AEP Common Shareholders
Changes in Carrying Amount of Goodwill
Schedule of Goodwill [Table Text Block]
Advances to Affiliates
Due from Related Parties, Current
Accounts Receivable:
Affiliated Companies
Accrued Unbilled Revenues
Unbilled Receivables, Current
Pledged Accounts Receivable - AEP Credit
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount
Miscellaneous
Other Receivables
Allowance for Uncollectible Accounts
Accounts Receivable, Allowance for Credit Loss, Current
Renewable Energy Credits
Renewable Energy Credits
Amount of renewable energy credits removed from the materials and supplies line item and split out separately on the face of the balance sheet due to materiality.
Risk Management Assets
Regulatory Asset for Under-Recovered Fuel Costs
Accrued Reimbursement of Spent Nuclear Fuel Costs
Accrued Reimbursement of Spent Nuclear Fuel Costs
Accrued reimbursement of spent nuclear fuel costs at Cook nuclear plant. The Department of Energy has an obligation to I&M over the storage of spent nuclear waste.
Margin Deposits
Margin Deposit Assets
Prepayments and Other Current Assets
Prepaid Expense and Other Assets, Current
Property, Plant and Equipment
Distribution
Regulatory Assets
Goodwill
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
Advances from Affiliates
Due to Related Parties, Current
Short-term Debt:
Short-term Debt [Abstract]
Securitized Debt for Receivables - AEP Credit
Other Short-term Debt
Short-term Bank Loans and Notes Payable
Risk Management Liabilities
Customer Deposits
Customer Deposits, Current
Accrued Interest
Oklaunion Purchase Power Agreement
Oklaunion Purchase Power Agreement - Current
AEP Texas has partial ownership in the Oklaunion Plant which is operated by PSO but has leased its entire portion of the output of the plant to a non-utility affiliate. This is the current liability portion of the lease.
Obligations Under Operating Leases
Regulatory Liability for Over-Recovered Fuel Costs
Other Current Liabilities
Long-term Risk Management Liabilities
Asset Retirement Obligations
Asset Retirement Obligations, Noncurrent
Employee Benefits and Pension Obligations
Employee Benefits and Pension Obligations
Element represents the noncurrent liability recognized on the balance sheet that is associated with employee benefit and pension obligations including, but not limited to, defined benefit pension plans, other postretirement defined benefit plans, deferred incentive compensation and other postemployment benefits.
Obligations Under Operating Leases
Deferred Credits and Other Noncurrent 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
Contingently Redeemable Performance Share Awards
Mezzanine Equity
The fair value as of the balance sheet date of contingently redeemable performance share awards.
Total Mezzanine Equity
Total Mezzanine Equity
Total mezzanine equity balance.
Members' Capital
Members' Capital
Common Stock
Common Stock, Value, Issued
Paid-in Capital
Additional Paid in Capital
Accumulated Other Comprehensive Income (Loss)
TOTAL COMMON SHAREHOLDERS' EQUITY
Stockholders' Equity Attributable to Parent
Noncontrolling Interests
Stockholders' Equity Attributable to Noncontrolling Interest
TOTAL EQUITY
Goodwill
Goodwill Disclosure [Text Block]
Actuarial Assumption Financial Statement Effect [Axis]
Actuarial Assumption Financial Statement Effect [Axis]
Actuarial Assumption Financial Statement Effect.
Actuarial Assumption Financial Statement Effect [Domain]
Actuarial Assumption Financial Statement Effect [Domain]
[Domain] for Actuarial Assumption Financial Statement Effect.
Benefit Obligations [Member]
Benefit Obligations [Member]
Benefit Obligations Member
Benefit Costs [Member]
Benefit Costs [Member]
Benefit Costs Member
Actuarial Assumptions
Defined Benefit Plan, Assumptions [Table Text Block]
Health Care Trend Rates
Schedule of Health Care Cost Trend Rates [Table Text Block]
Reconciliation of Changes in Benefit Obligations and Fair Value of Assets
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block]
Benefit Amounts Recognized on the Balance Sheets
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]
Amounts Included in AOCI and Regulatory Assets
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
Components of Change in Amounts Included in AOCI and Regulatory Assets
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
Allocated Assets of Investments
Allocated Assets of Investments [Table Text Block]
Tabular disclosure of the percentage of investments that are allocated to the Registrant Subsidiaries.
Assets within Fair Value Hierarchy
Schedule of Allocation of Plan Assets [Table Text Block]
Accumulated Benefit Obligation
Accumulated Benefit Obligation [Text Block]
Table containing the Accumulated Benefit Obligation as a single block of text.
Underfunded Projected Benefit Obligation
Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets [Table Text Block]
Underfunded Accumulated Benefit Obligation
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block]
Estimated Contributions and Payments to the Pension and OPEB Plans
Schedule Of Estimated Contributions And Payments To Pension And O P E B Plans [Text Block]
Tabular disclosure of the expected contributions and payments expected to be paid to the pension plans and/or other employee benefit plans in the next fiscal year.
Estimated Payments Expected to be Made by the Pension and OPEB Plans
Schedule of Expected Benefit Payments [Table Text Block]
Components of Net Periodic Benefit Cost
Schedule of Net Benefit Costs [Table Text Block]
Cost for Matching Contributions to the Retirement Savings Plans
Schedule of Costs of Retirement Plans [Table Text Block]
Financing Activities
Debt Disclosure [Text Block]
Property, Plant and Equipment [Member]
Property, Plant and Equipment [Member]
Asset Retirement Obligation [Member]
Asset Retirement Obligation [Member]
Asset retirement obligation shown on the balance sheet
Equity Method Investments [Member]
Equity Method Investments [Member]
Liabilities, Total [Member]
Liabilities, Total [Member]
Impaired Long-Lived Assets Held and Used by Type [Axis]
Impaired Long-Lived Assets Held and Used by Type [Axis]
Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Other Assets [Member]
Other Assets [Member]
Merchant Coal-Fired Generation Assets [Member]
Merchant Coal-Fired Generation Assets [Member]
Merchant Coal-Fired Generation Assets [Member]
Zimmer Plant Assets [Member]
Zimmer Plant Assets [Member]
Zimmer Plant Assets [Member]
Racine Hydroelectric Plant [Member]
Racine Hydroelectric Plant [Member]
Racine Hydroelectric Plant [Member]
Gavin, Waterford, Darby and Lawrenceburg Plants [Member]
Gavin, Waterford, Darby and Lawrenceburg Plants [Member]
Gavin, Waterford, Darby and Lawrenceburg Plants [Member]
Welsh Plant Unit 2 [Member]
Welsh Plant Unit 2 [Member]
Welsh Plant Unit 2
Noncash or Part Noncash Acquisition, Other Assets Acquired
Noncash Contribution of Assets by Noncontrolling Interest
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed
Noncash or Part Noncash Acquisition, Value of Assets Acquired
Noncash or Part Noncash Acquisition, Value of Assets Acquired
Competitive generation assets sold to a nonaffiliated party (in MWs).
Competitive generation assets sold to a nonaffiliated party (in MWs).
Competitive generation assets of AGR and AEGCo sold to a nonaffiliated party in January 2017.
Cash Proceeds from Sales of Assets, Investing Activities
Proceeds from Sales of Assets, Investing Activities
Cash Proceeds from Disposition of Plant, Net
Cash Proceeds from Disposition of Business, Net
Cash Proceeds from Disposition of Business, Net
Pre-tax Gain on Sale of Plants
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal
Dispositions, Assets and Liabilities Held for Sale and Impairments (Textuals)
Dispositions, Assets and Liabilities Held for Sale and Impairments (Textuals) [Abstract]
Dispositions, Assets and Liabilities Held for Sale and Impairments (Textuals) [Abstract]
Make Whole Premium on Extinguishment of Long-term Debt
Disposal Group, Including Discontinued Operation, Income Statement Disclosures
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Asset Impairment Charges
Asset Impairment Charges [Abstract]
Fair Value of Impaired Assets
Property, Plant, and Equipment, Fair Value Disclosure
Book Value of Impaired Assets
Utilities Operating Expense, Operations
Noncash or Part Noncash Acquisition, Debt Assumed
Noncash or Part Noncash Acquisition, Debt Assumed
Payments to Acquire Businesses, Gross
Payments to Acquire Businesses, Gross
Guarantor Obligations, Current Carrying Value
Book Values and Fair Values of Long-term Debt
Fair Value, by Balance Sheet Grouping [Table Text Block]
Other Temporary Investments
Other Temporary Investments [Text Block]
Other Temporary Investments
Debt and Equity Securities Within Other Temporary Investments
Debt and Equity Securities Within Other Temporary Investments [Text Block]
Debt and equity securities within Other Temporary Investments.
Nuclear Trust Fund Investments
Nuclear Trust Fund Investments [Text Block]
Nuclear trust fund investments.
Securities Activity Within the Decommissioning and SNF Trusts
Securities Activity Within Decommissioning and SNF Trusts [Text Block]
Securities Activity Within the decommissioning and SNF trusts.
Contractual Maturities, Fair Value of Debt Securities
Investments Classified by Contractual Maturity Date [Table Text Block]
Fair Value, Assets and Liabilities Measured on Recurring Basis
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Changes in Fair Value of Net Trading Derivatives Classified as Level 3
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Significant Unobservable Inputs for Level 3
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block]
Sensitivity of Fair Value Measurements
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
Reportable Segment Information
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Operating Loss Carryforwards [Table]
Operating Loss Carryforwards [Table]
Arkansas [Member]
ARKANSAS
Kentucky [Member]
KENTUCKY
Louisiana [Member]
LOUISIANA
Oklahoma [Member]
OKLAHOMA
Tennessee [Member]
TENNESSEE
Virginia [Member]
VIRGINIA
West Virginia [Member]
WEST VIRGINIA
Ohio Municipal [Member]
Ohio Municipal [Member]
Ohio Municipal [Member]
Federal [Member]
Internal Revenue Service (IRS) [Member]
Tax Issue [Axis]
Tax Issue [Axis]
Tax Issue [Axis]
Tax Issue [Domain]
Tax Issue [Domain]
[Domain] for Tax Issue [Axis]
Remeasurement of Kentucky Deferred Taxes [Member]
Remeasurement of Kentucky Deferred Taxes [Member]
Income Tax Expense (Benefit) due to remeasurement of Kentucky deferred taxes under a unitary filing group.
Statement [Line Items]
Operating Loss Carryforwards [Line Items]
Consolidated Income Taxes Before Extraordinary Item
Income Tax Expense (Benefit), Continuing Operations, by Jurisdiction [Abstract]
Federal:
Federal Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current
Current Federal Tax Expense (Benefit)
Deferred
Deferred Federal Income Tax Expense (Benefit)
Deferred Investment Tax Credits
Investment Tax Credit
Total Federal
Federal Income Tax Expense (Benefit), Continuing Operations
Current
Current State and Local Tax Expense (Benefit)
Deferred
Deferred State and Local Income Tax Expense (Benefit)
Deferred State and Local Investment Tax Credits
Deferred State and Local Investment Tax Credits
For state and local, the amount deducted from an entities' taxes, reflecting a percentage of an amount invested in certain assets spread over the useful life of those assets; includes deferred state and local investment tax credits.
Total State and Local
State and Local Income Tax Expense (Benefit), Continuing Operations
Income Tax Expense (Benefit):
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Net Income
Less: Equity Earnings – Dolet Hills
Income Taxes on Pretax Income at Statutory Rate (21%, 21% and 35% in 2019, 2018 and 2017, Respectively)
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount
Federal Statutory Income Tax Rate
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Depreciation
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depreciation, Amount
Depletion
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depletion, Amount
Investment Tax Credit Amortization
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount
Increase Decrease in income taxes due to energy production credits
Increase Decrease in income taxes due to energy production credits
Increase Decrease in Income Taxes due to Energy Production Credits.
State and Local Income Taxes, Net
Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Amount
Removal Costs
Increase Decrease in Income Taxes Due to Removal Costs
The portion of the difference between total income tax expense (benefit) as reported in the Income Statement and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations due to removal costs.
AFUDC
Increase Decrease In Income Taxes Afudc
The portion of the difference between total income tax expense (benefit) as reported in the Income Statement and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to AFUDC.
Parent Company Loss Benefit
Effective Income Tax Rate Reconciliation, Parent Company Loss Benefit
The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to the loss benefit of the Parent company as attributable to the subsidiaries.
Valuation Allowance
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount
Tax Reform Adjustments
Tax Reform Adjustments
The portion of the difference related to Federal Tax Reform Adjustments.
Tax Adjustments
Increase Decrease in Income Taxes Due to Tax Reserve Adjustments
The portion of the difference between total income tax expense (benefit) as reported in the Income Statement and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to tax reserve adjustments.
Tax Reform Excess ADIT Reversal
Tax Reform Excess ADIT Reversal
The portion of the difference related to Tax Reform Excess ADIT Reversal.
Other
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount
Effective Income Tax Rate
Effective Income Tax Rate Reconciliation, Percent
Net Deferred Tax Liability and Significant Temporary Differences
Net Deferred Tax Liability and Significant Temporary Differences [Abstract]
Net deferred tax liability and significant temporary differences.
Deferred Tax Assets
Deferred Tax Assets, Gross
Deferred Tax Liabilities
Deferred Tax Liabilities, Gross
Property Related Temporary Differences
Deferred Tax Assets Liabilities Net Property Related Temporary Differences
The difference between the tax basis and the carrying amount of an asset or liability in the financial statements prepared in accordance with GAAP that will result in taxable amounts in one or more future periods related to property related temporary differences.
Amounts Due from Customers for Future Federal Income Taxes
Amounts Due from Customers for Future Federal Income Taxes
The difference between the tax basis and the carrying amount of an asset or liability in the financial statements prepared in accordance with GAAP that will result in taxable amounts in one or more future periods related to amounts due from customers for future federal income taxes.
Deferred State Income Taxes
Deferred State Income Taxes
Amount of deferred tax liability attributable to taxable temporary differences from state income taxes.
Securitized Assets
Deferred Tax Assets Liabilities Securitized Transition Assets
The difference between the tax basis and the carrying amount of an asset or liability in the financial statements prepared in accordance with GAAP that will result in taxable amounts in one or more future periods related to carrying value of a regulatory asset that represents capitalized stranded costs that have been securitized (financed with debt) and are expected to be recoverable through a transition charge after one year (or beyond the operating cycle if longer).
Regulatory Assets
Deferred Tax Liabilities, Regulatory Assets
Accrued Nuclear Decommissioning
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Asset Retirement Obligations
Deferred Revenues
Deferred Revenue
Net Operating Loss Carryforward
Deferred Tax Assets, Operating Loss Carryforwards
Tax Credit Carryforward
Deferred Tax Assets, Tax Credit Carryforwards, General Business
Investment in Partnership
Deferred Tax Liabilities, Investments
All Other, Net
All Other, Net
The total of all other differences not specifically indicated elsewhere between the tax basis and the carrying amount of an asset or liability in the financial statements prepared in accordance with GAAP that will result in taxable amounts in one or more future periods.
Net Deferred Tax Liabilities
Deferred Income Tax Liabilities, Net
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards [Abstract]
Operating Loss Carryforwards [Abstract]
Net Income Tax Operating Loss Carryforward
Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date
Operating Loss Carryforwards, Expiration Date
Tax Credit Carryforward
Summary of Tax Credit Carryforwards [Abstract]
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
Tax Credit Carryforward, Amount
Tax Credit Carryforward, Amount
Tax Credit Carryforward Amount To Expire If Not Used
Tax Credit Carryforward Amount To Expire If Not Used
The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws that will expire if not used by certain dates.
Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1,
Unrecognized Tax Benefits
Increase - Tax Positions Taken During a Prior Period
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions
Decrease - Tax Positions Taken During a Prior Period
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions
Increase - Tax Positions Taken During the Current Year
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions
Decrease - Tax Positions Taken During the Current Year
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions
Decrease - Settlements with Taxing Authorities
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities
Decrease - Lapse of the Applicable Statute of Limitations
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations
Balance at December 31,
Tax Contingency [Abstract]
Tax Contingency [Abstract]
Tax Contingency [Abstract]
Unrecognized Tax Benefits, if Recognized - Amount
Unrecognized Tax Benefits that Would Impact Effective Tax Rate
Income Taxes (Textuals) [Abstract]
Income Taxes (Textuals) [Abstract]
Income Taxes.
Valuation Allowance
Deferred Tax Assets, Valuation Allowance
Period with No Change in Unrecognized Tax Benefits
Period with No Change in Unrecognized Tax Benefits
Period within which there will be no change in unrecognized tax benefits.
Tax Credit Carryforward, Expiration Date
Tax Credit Carryforward, Expiration Date
Kentucky Single Corporate Tax Rate
Kentucky Single Corporate Tax Rate
Kentucky Single Corporate Tax Rate
Kentucky Net Operating Loss Limitation Percent
Kentucky Net Operating Loss Limitation Percent
Kentucky Net Operating Loss Limitation Percent
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.
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.
Actuarial Assumptions for Benefit Obligations
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]
Actuarial Assumptions for Benefit Obligations
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount Rate
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate
Interest Crediting Rate
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Interest Crediting Rate
Interest Crediting Rate used to determine benefit obligation of defined benefit plan.
Rate of Compensation Increase
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase
Actuarial Assumptions for Net Periodic Benefit Costs
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount Rate
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate
Interest Crediting Rate
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Interest Crediting Rate
Interest Crediting Rate used to determine net periodic benefit cost of defined benefit plan.
Expected Return on Plan Assets
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets
Rate of Compensation Increase
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase
Health Care Trend Rates
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Initial
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year
Ultimate
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate
Year Ultimate Reached
Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate
Projected Plan Obligations, Plan Assets and Funded Status
Defined Benefit Plan [Abstract]
Change in Benefit Obligation
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation as of January 1
Actuarial (Gain) Loss
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)
Plan Amendments
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment
Benefit Payments
Defined Benefit Plan, Benefit Obligation, Benefits Paid
Participant Contributions
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant
Medicare Subsidy
Defined Benefit Plan, Benefit Obligation, Prescription Drug Subsidy Receipt
Benefit Obligation as of December 31
Change in Fair Value of Plan Assets
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets as of January 1
Actual Gain (Loss) on Plan Assets
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)
Company Contributions
Defined Benefit Plan, Plan Assets, Contributions by Employer
Participant Contributions
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant
Benefit Payments
Defined Benefit Plan, Plan Assets, Benefits Paid
Fair Value of Plan Assets as of December 31
Funded (Underfunded) Status as of December 31
Defined Benefit Plan, Funded (Unfunded) Status of Plan
Benefit Amounts Recognized on the Balance Sheets
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Deferred Charges and Other Noncurrent Assets - Prepaid Benefit Costs
Employee Benefits and Pension Assets - Prepaid Benefit Costs
Assets for Plan Benefits, Defined Benefit Plan
Other Current Liabilities - Accrued Short-term Benefit Liability
Liability, Defined Benefit Plan, Current
Employee Benefits and Pension Obligations - Accrued Long-term Benefit Liability
Liability, Defined Benefit Plan, Noncurrent
Deferred Credits and Other Noncurrent Liabilities - Accrued Long-term Benefit Liability
Funded (Underfunded) Status
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position
Amounts Included in AOCI, Income Tax Expense and Regulatory Assets
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Components
Components [Abstract]
Components.
Net Actuarial Loss
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax
Prior Service Cost (Credit)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax
Recorded as
Recorded as [Abstract]
Recorded as.
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax
Components of Change in Amounts Included in AOCI and Regulatory Assets
Components Of Change In Plan Assets And Benefit Obligations Recognized In Pretax AOCI [Abstract]
Actuarial (Gain) Loss During the Year
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax
Amortization of Actuarial Gain (Loss)
Prior Service (Credit) Cost
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax
Amortization of Prior Service Credit (Cost)
Change for the Year
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax
Benefit Plans (Textuals) [Abstract]
Leases
Leases of Lessee Disclosure [Text Block]
Quarterly Financial Information
Quarterly Financial Information [Text Block]
Cash Flow Hedges, Tax
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax
Securities Available for Sale, Tax
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax
Amortization of Pension and OPEB Deferred Costs, Tax
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax
Pension and OPEB Funded Status, Tax
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax
Stock-based Compensation
Share-based Payment Arrangement [Text Block]
Cover page.
Entities [Table]
Entities [Table]
Entity Listings, Exchange [Axis]
Entity Listings, Exchange [Axis]
Exchange [Domain]
Exchange [Domain]
New York Stock Exchange
NEW YORK STOCK EXCHANGE, INC. [Member]
Common Stock, $6.50 par value
6.125% Corporate Units
Preferred Stock [Member]
Entity Information [Line Items]
Entity Information [Line Items]
Document Type
Document Type
Document Annual Report
Document Annual Report
Document Period End Date
Document Period End Date
Document Transition Report
Document Transition Report
Entity File Number
Entity File Number
Entity Registrant Name
Entity Registrant Name
Entity Incorporation, State or Country Code
Entity Incorporation, State or Country Code
Entity Tax Identification Number
Entity Tax Identification Number
Entity Address, Address Line One
Entity Address, Address Line One
Entity Address, City or Town
Entity Address, City or Town
Entity Address, State or Province
Entity Address, State or Province
Entity Address, Postal Zip Code
Entity Address, Postal Zip Code
City Area Code
City Area Code
Local Phone Number
Local Phone Number
Title of 12(b) Security
Title of 12(b) Security
Trading Symbol
Trading Symbol
Security Exchange Name
Security Exchange Name
Entity Well-known Seasoned Issuer
Entity Well-known Seasoned Issuer
Entity Voluntary Filers
Entity Voluntary Filers
Entity Current Reporting Status
Entity Current Reporting Status
Entity Interactive Data Current
Entity Interactive Data Current
Entity Filer Category
Entity Filer Category
Entity Small Business
Entity Small Business
Entity Emerging Growth Company
Entity Emerging Growth Company
Entity Shell Company
Entity Shell Company
Entity Public Float
Entity Public Float
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Documents Incorporated by Reference
Documents Incorporated by Reference [Text Block]
Entity Central Index Key
Entity Central Index Key
Amendment Flag
Amendment Flag
Document Fiscal Year Focus
Document Fiscal Year Focus
Document Fiscal Period Focus
Document Fiscal Period Focus
Current Fiscal Year End Date
Current Fiscal Year End Date