Income Statement [Abstract] Statement [Table] Statement [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] PPL Electric Utilities Corp [Member] PPL ELECTRIC UTILITIES CORP [Member] A direct subsidiary of PPL and a regulated public utility. PPL Electric delivers electricity in its Pennsylvania service territory and provides electricity supply to retail customers in that territory as a provider of last resort under the Customer Choice Act. LG And E And KU Energy LLC [Member] L G And E And K U Energy L L C [Member] A direct wholly owned subsidiary of PPL, a holding company which owns and operates regulated public utilities engaged in the generation, transmission, distribution and sale of electricity and the distribution and sale of natural gas primarily in Kentucky. Louisville Gas And Electric Co [Member] LOUISVILLE GAS And ELECTRIC CO [Member] An indirect subsidiary of PPL and a public utility subsidiary of LKE engaged in the regulated generation, transmission, distribution and sale of electricity in Kentucky, and distribution and sale of natural gas in Kentucky. Kentucky Utilities Co [Member] KENTUCKY UTILITIES CO [Member] An indirect subsidiary of PPL and a public utility subsidiary of LKE engaged in the regulated generation, transmission, distribution and sale of electricity primarily in Kentucky. Statement [Line Items] Statement [Line Items] Operating Revenues Revenues [Abstract] Retail and wholesale Regulated Operating Revenue Electric revenue from affiliate Revenue from Related Parties Operating Revenues Revenues Operating Expenses Operating Expenses [Abstract] Operation Utilities Operating Expense [Abstract] Fuel Fuel Costs Energy purchases Purchased Power And Gas Costs incurred for purchased power and purchased gas charged against earnings for the period. Energy purchases from affiliate Utilities Operating Expense Purchased Power From Related Parties The amount of purchased power from related parties charged against earnings for the period. Other operation and maintenance Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses Depreciation Utilities Operating Expense, Depreciation and Amortization Taxes, other than income Utilities Operating Expense, Taxes Total Operating Expenses Utilities Operating Expense Operating Income Operating Income (Loss) Other Income (Expense) - net Other Nonoperating Income (Expense) Interest Income from Affiliate Interest Income, Related Party Interest Expense Interest Expense Interest Expense with Affiliate Interest Expense, Related Party Income Before Income Taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income Taxes Income Tax Expense (Benefit) Income from Continuing Operations After Income Taxes Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Net Income Net Income (Loss) Attributable to Parent Earnings Per Share of Common Stock: Earnings Per Share [Abstract] Net Income: Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Weighted-Average Shares of Common Stock Outstanding (in thousands) Weighted Average Number of Shares Outstanding, Basic [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income [Text Block] The entire disclosure of accumulated other comprehensive income (loss). Commitments and Contingencies Disclosure [Abstract] Schedule Of Guarantee Obligations [Table] Schedule of Guarantor Obligations [Table] By Company [Axis] By Company [Axis] The set of companies associated with the report. By Company [Domain] By Company [Domain] All the names of the companies being reported upon in a document. PPL Electric [Member] PPL Electric Utilities Corporation [Member] A direct subsidiary of PPL and a regulated public utility. PPL Electric delivers electricity in Pennsylvania. Guarantee By Entity [Axis] Guarantee By Entity [Axis] Information about guarantees and other assurances detailed by subsidiary, if applicable. Guarantee By Entity [Domain] Guarantee By Entity [Domain] Description of guarantees and other assurances detailed by subsidiary, if applicable. PPL Guarantee [Member] PPL Guarantee [Member] Guarantees and other assurances of the parent company, PPL. These include those are direct made by the parent or indirect through subsidiaries that are not SEC registrants. PPL Electric Guarantee [Member] PPL Electric Guarantee [Member] Guarantees and other assurances of PPL Electric and its subsidiaries that, due to consolidation, are direct or indirect guarantees of the parent company, PPL. LKE Guarantee [Member] Louisville Gas And Electric And KU Energy Guarantee [Member] Guarantees and other assurances of Louisville Gas and Electric and KU Energy LLC that, due to consolidation, are direct or indirect guarantees of the parent company, PPL. LGE And KU Guarantee [Member] Louisville Gas And Electric Company And Kentucky Utilities Guarantee [Member] Guarantees and other assurances of Louisville Gas and Electric Company and Kentucky Utilities Company that, due to consolidation, are direct or indirect guarantees of the parent company, LKE and PPL. Guarantee By Nature [Axis] Guarantor Obligations, Nature [Axis] Guarantee By Nature [Domain] Guarantor Obligations, Nature [Domain] Indemnification Guarantee [Member] Indemnification Agreement [Member] Financial Guarantee [Member] Financial Guarantee [Member] Guarantee By Description [Axis] Guarantee By Description [Axis] Information about guarantees and other assurances by description. Guarantee By Description [Domain] Guarantee By Description [Domain] Description of specific guarantees and other assurances. Indemnifications Related To WPD Midlands Acquisition [Member] Indemnifications Related To WPD Midlands Acquisition [Member] Indemnifications related to the acquisition of WPD Midlands acquisition to indemnify certain former directors of a Turkish entity in which WPD Midlands Holdings Limited previously owned an interest for any liabilities that may arise as a result of an investigation by Turkish tax authorities, and PPL WEM has received a cross-indemnity from E.ON AG with respect to these indemnification obligations. Additionally, PPL subsidiaries agreed to provide indemnifications to subsidiaries of E.ON AG for certain liabilities relating to properties and assets owned by affiliates of E.ON AG that were transferred to WPD Midlands in connection with the acquisition. WPD Indemnifications For Entities In Liquidation and Sales Of Assets [Member] WPD Indemnifications For Entities In Liquidation Sales Of Assets [Member] Indemnifications for entities in liquidation and sales of assets. WPD Guarantee Of Pension And Other Obligations Of Unconsolidated Entities [Member] WPD Guarantee Of Pension And Other Obligations Of Unconsolidated Entities [Member] WPD guarantee of pension and other obligations of unconsolidated entities. Guarantee Of Inventory Value [Member] Guarantee Of Inventory Value [Member] Guarantee to purchase any remaining inventory that has not been used or sold from the guaranteed party, thus protecting the guaranteed party from reductions in the fair value of the inventory. Indemnification Of Lease Termination And Other Divestitures [Member] Indemnifications Issued By LKE [Member] Indemnifications issued by LKE to third parties prior to the PPL acquisition in November 2010. LGE And KU Guarantee Of Shortfall Related To OVEC [Member] Guarantee For Shortfall Related To Ohio Valley Electric Corporation [Member] Guarantee of shortfall related to Ohio Valley Electric Corporation. This rolls up to the PPL Corporation through consolidation of LG&E and KU. Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Guarantor Obligations [Line Items] Guarantor Obligations [Line Items] Recorded liability for all guarantees Guarantor Obligations, Current Carrying Value Maximum exposure Guarantor Obligations, Maximum Exposure, Undiscounted Maximum exposure is not estimable Guarantor Obligations, Maximum Exposure Inestimable Term of guarantee (in years) Guarantor Obligations, Term Maximum exposure of guarantee related to terminated lease specific to operational, regulatory and environmental issues Guarantee Maximum Exposure 2021 The maximum exposure of a guarantee related to the termination of a lease related to certain non-utility generating stations in western Kentucky until July 2009. This portion of the guarantee relates to covering operational, regulatory and environmental commitments and indemnifications made under the agreement. Contingent proportionate share of OVEC's outstanding debt Proportionate Share Of Ohio Valley Electric Corporation Outstanding Debt Entity's contingent proportionate share of OVEC's outstanding debt. Minimum Period In Years That Indemnifications Generally Expire Minimum Period In Years That Indemnifications Generally Expire The minimum period, in years, that indemnifications related to the dissolution of entities generally expire after the date of dissolution. Maximum Period In Years That Indemnifications Generally Expire Maximum Period In Years That Indemnifications Generally Expire The maximum period, in years, that indemnifications related to the dissolution of entities generally expire after the date of dissolution. Other Guarantee (Numeric) [Abstract] Other Guarantee (Numeric) [Abstract] Maximum aggregate coverage bodily injury and property damage Maximum Aggregate Coverage Bodily Injury And Property Damage Maximum aggregate insurance coverage for liability assumed under contract for bodily injury and property damage. Income Tax Disclosure [Abstract] Tax Reform [Table] Tax Reform [Table] Tax Reform [Table] Tax Adjustment Items [Axis] Tax Adjustment Type [Axis] Tax Adjustment Type [Axis] Tax Adjustment Items [Domain] Tax Adjustment Type [Domain] [Domain] for Tax Adjustment Type [Axis] Tax Reform [Line Items] Tax Reform [Line Items] Line Items for Tax Reform Table Debt Disclosure [Abstract] Schedule of Short-term Debt [Table] Schedule of Short-term Debt [Table] PPL Capital Funding [Member] PPL Capital Funding [Member] A wholly owned financing subsidiary of PPL. LGE [Member] Louisville Gas And Electric Company [Member] An indirect subsidiary of PPL and a public utility subsidiary of LKE providing electricity in Kentucky and distribution of natural gas in Kentucky. KU [Member] Kentucky Utilities Company [Member] An indirect subsidiary of PPL and a public utility subsidiary of LKE providing electricity primarily in Kentucky, Virginia and Tennessee. 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] Reclassified Debt [Axis] Reclassified Debt [Axis] Reclassification of commercial paper from short-term to long-term. Reclassified Debt [Domain] Reclassified Debt [Domain] [Domain] for Reclassification of commercial paper from short-term to long-term. Short-term Debt [Line Items] Short-term Debt [Line Items] Weighted - Average Interest Rate Short-term Debt, Weighted Average Interest Rate, at Point in Time Capacity Short-term Debt, Maximum Borrowing Capacity Maximum borrowing capacity under the short-term credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Commercial Paper Issuances Commercial Paper Unused Capacity Commercial Paper Unused Borrowing Capacity Amount Amount of unused borrowing capacity under the commercial paper financing arrangement that is available to the entity as of the balance sheet date. Statement of Stockholders' Equity [Abstract] Statement Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Earnings Reinvested [Member] Retained Earnings [Member] Vote per share of PPL's common stock Votes Per Share Of Common Stock The number of votes each holder of one share of the company's common stock is entitled to on any questions presented to any shareowners' meeting. Tax Effect Of New Accounting Principle In Period Of Adoption Tax Effect Of New Accounting Principle In Period Of Adoption Tax effect of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. Income Taxes [Table] Income Taxes [Table] Describes the details pertaining to income taxes. Income Taxes [Line Items] Income Taxes [Line Items] Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Indefinite-Lived Intangible Assets [Table] Schedule of Indefinite-Lived Intangible Assets [Table] Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] Corporate and Other [Member] Corporate Segment [Member] United Kingdom Regulated [Member] United Kingdom Regulated [Member] Consists primarily of the regulated electric distribution operations in the United Kingdom Indefinite-Lived Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis] Indefinite-Lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-Lived Intangible Assets [Line Items] Indefinite-lived Intangible Assets [Line Items] Accounting Policies [Abstract] Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] A summary of the various accounting policy disclosures. U.K. Regulated [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other Noncurrent Assets [Member] Other Noncurrent Assets [Member] Adjustments for Change in Accounting Principle [Axis] Adjustments for Change in Accounting Principle [Axis] Adjustments for Change in Accounting Principle [Domain] Adjustments for Change in Accounting Principle [Domain] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Goodwill Goodwill Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Table] Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow [Table] Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow [Table] Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items] Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow [Line Items] [Line Items] for Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow [Table] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Restricted Cash, Current Restricted Cash, Current Restricted Cash, Noncurrent Restricted Cash, Noncurrent Cash, Cash Equivalents and Restricted Cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Financing Receivable, after Allowance for Credit Loss, Current [Abstract] Financing Receivable, after Allowance for Credit Loss, Current [Abstract] Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Accounts Receivable - Customer and Unbilled Revenue [Member] Accounts Receivable Customer and Unbilled Revenue [Member] Amounts receivable from customers and unbilled revenue. Other [Member] Other Class of Financing Receivable [Member] Other Class of Financing Receivable Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Balance Financing Receivable, Allowance for Credit Loss Charged to Income Financing Receivable, Credit Loss, Expense (Reversal) Deductions Financing Receivable, Allowance for Credit Loss, Writeoff New Accounting Guidance Adopted [Abstract] New Accounting Guidance Adopted [Abstract] New Accounting Guidance Adopted [Abstract] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Statement of Financial Position [Abstract] Assets Assets [Abstract] Assets, Current [Abstract] Assets, Current [Abstract] Accounts receivable (less reserve:) Receivables, Net, Current [Abstract] Customer Accounts Receivable, after Allowance for Credit Loss, Current Other Nontrade Receivables, Current Accounts receivable from affiliates Accounts Receivable, Related Parties Notes receivable from affiliate Notes Receivable, Related Parties, Current Unbilled revenues Unbilled Contracts Receivable Fuel, materials and supplies Inventory, Net Prepayments Prepaid Expense, Current Price risk management assets Derivative Instruments and Hedges, Assets Regulatory assets Regulatory Assets, Current Other current assets Other Assets, Current Total Current Assets Assets, Current Property, Plant and Equipment Property, Plant and Equipment, Net [Abstract] Regulated utility plant Public Utilities, Property, Plant and Equipment, Plant in Service Less: accumulated depreciation - regulated utility plant Public Utilities, Property, Plant and Equipment, Accumulated Depreciation Regulated utility plant, net Public Utilities, Property, Plant and Equipment, Net Non-regulated property, plant and equipment Property, Plant and Equipment, Other, Gross Less: accumulated depreciation - non-regulated property, plant and equipment Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Non-regulated property, plant and equipment, net Property Plant And Equipment Net Nonregulated Period end value of property, plant and equipment, net of accumulated depreciation that relate to non-regulated subsidiaries. Construction work in progress Construction in Progress, Gross Property, Plant and Equipment, net Property, Plant and Equipment, Net Other Noncurrent Assets Assets, Noncurrent [Abstract] Regulatory assets Regulatory Assets, Noncurrent Other intangibles Intangible Assets, Net (Excluding Goodwill) Pension benefit asset Assets for Plan Benefits, Defined Benefit Plan Price risk management assets Derivative Instruments and Hedges, Noncurrent Other noncurrent assets Other Assets, Noncurrent Total Other Noncurrent Assets Assets, Noncurrent Total Assets Assets Liabilities and Equity Liabilities and Equity [Abstract] Current Liabilities Liabilities, Current [Abstract] Short-term debt Short-term Debt Long-term debt due within one year Long-term Debt, Current Maturities Notes payable with affiliates Notes Payable, Related Parties, Current Accounts payable Accounts Payable, Current Accounts payable to affiliates Accounts Payable, Related Parties, Current Taxes Taxes Payable, Current Price risk management liabilities Price risk management liabilities current Carrying amount as of the balance sheet date of the liability arising from derivative instruments and hedging activities, which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer. Interest Interest Payable, Current Dividends Dividends Payable, Current Customer deposits Current Customer Deposits The current portion of money or property received from customers which is either to be returned upon satisfactory contract completion or applied to customer receivables in accordance with the terms of the contract or the understandings. Regulatory liabilities Regulatory Liability, Current Asset retirement obligations Asset Retirement Obligation, Current Other current liabilities Other Liabilities, Current Total Current Liabilities Liabilities, Current Long-term Debt Long-term Debt, Unclassified [Abstract] Long-term debt Notes and Loans, Noncurrent Long-term debt to affiliate Notes Payable, Related Parties, Noncurrent Long-term Debt Long-term Debt, Excluding Current Maturities Deferred Credits and Other Noncurrent Liabilities Liabilities, Noncurrent [Abstract] Deferred income taxes Deferred Income Tax Liabilities, Net Investment tax credits Deferred Investment Tax Credit The noncurrent portion of the deferred investment tax credits as of the balance sheet date. Accrued pension obligations Liability, Defined Benefit Pension Plan, Noncurrent Asset retirement obligations Asset Retirement Obligations, Noncurrent Regulatory liabilities Regulatory Liability, Noncurrent Price risk management liabilities Price risk management liabilities Carrying amount as of the balance sheet date of the liabilities arising from derivative contracts and hedging activities, which are expected to be converted into cash or otherwise disposed of after a year or beyond the normal operating cycle, if longer. Other deferred credits and noncurrent liabilities Other Liabilities, Noncurrent Total Deferred Credits and Other Noncurrent Liabilities Liabilities, Noncurrent Commitments and Contingent Liabilities Commitments and Contingencies Equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Common stock Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Earnings reinvested Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total Equity Stockholders' Equity Attributable to Parent Member's Equity Members' Equity Total Liabilities and Equity Liabilities and Equity Derivative Instruments and Hedging Activities Disclosure [Abstract] Interest Rate Risk And Foreign Currency Risk [Table] Interest Rate Risk And Foreign Currency Risk [Table] Derivative Instruments Gain (Loss) By Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Cash Flow Hedges [Member] Cash Flow Hedging [Member] Net Investment Hedges [Member] Net Investment Hedging [Member] Economic Hedges [Member] Economic Hedges [Member] Derivative contracts that economically hedge a risk, but do not receive hedge accounting treatment because they were not eligible or for which hedge accounting was not elected. Derivative Instrument Risk [Axis] Derivative Instrument [Axis] Derivative Contract Type [Domain] Derivative Contract [Domain] Cross Currency Interest Rate Swap Contracts [Member] Cross Currency Interest Rate Contract [Member] Interest Rate Swaps [Member] Interest Rate Swap [Member] Foreign Currency Contracts [Member] Foreign Exchange Contract [Member] Derivative Instrument Additional Information [Axis] Derivative Instrument Additional Information [Axis] Additional Information By Type of Derivative Contract Derivative Instrument Additional Information [Domain] Derivative Instrument Additional Information [Domain] [Domain] for Additional Information By Type of Derivative Contract Interest Rate Risk And Foreign Currency Risk [Line Items] Interest Rate Risk And Foreign Currency Risk [Line Items] Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract] Interest Rate Risk Cash Flow Hedges Numeric [Abstract] Gain (Loss) on Discontinuation of Interest Rate Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net Gain (Loss) on Discontinuation of Interest Rate Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net Derivative, Notional Amount Derivative, Notional Amount Foreign Currency Risk - Net Investment Hedges (Numeric) [Abstract] Summary of Net Investment Hedge Activity [Abstract] Net after tax gains (losses) on net investment hedges recognized in the foreign currency translation adjustment component of AOCI Gain (Loss) on Derivative Used in Net Investment Hedge, after Tax Foreign Currency Risk - Economic Activity (Numeric) [Abstract] Foreign Currency Derivative Instruments Not Designated as Hedging Instruments [Abstract] Total exposure hedged related to foreign currency contracts for anticipated earnings hedges classified as economic activity Total Exposure Hedged Foreign Currency Contracts Classified As Economic Activity Total exposure hedged through a combination of average rate forwards and average rate options foreign currency contracts for anticipated earnings hedges classified as economic activity. Regulated Operations [Abstract] Schedule Of Regulatory Assets [Table] Schedule of Regulatory Assets [Table] Regulatory Assets [Axis] Regulatory Asset [Axis] Regulatory Assets [Domain] Regulatory Asset [Domain] Plant outage costs [Member] Plant outage costs [Member] Plant outage costs [Member] Gas supply clause [Member] Asset Recoverable Gas Costs [Member] Smart Meter Rider [Member] Smart Meter Rider [Member] Costs of providing smart metering technology to comply with the requirements of Act 129. Allows for the over- or under-recovery from prior years that is refunded to, or from, customers through the adjustment factor determined for the subsequent periods. Transmission Formula Rate [Member] Transmission Formula Rate [Member] Costs recovery associated with actual transmission costs incurred, a return on transmission plant in service and an incentive return. Transmission Service Charge [Member] Transmission Service Charge [Member] Charges allocated to a utility by a operator of a transmission network. These charges are passed on to customers who receive basic generation supply service. These costs are included in allowable costs for rate making purposes. These costs are part of an over-or-under recovery mechanism. Defined Benefit Plans [Member] Pension and Other Postretirement Plans Costs [Member] Storm Costs [Member] Storm Costs [Member] Unamortized Loss On Debt [Member] Loss on Reacquired Debt [Member] Terminated Interest Rate Swaps [Member] Terminated Interest Rate Swap [Member] Forward based contracts in which two parties agree to swap periodic payments that are fixed at the outset of the swap contract with variable payments based on a market interest rate (index rate) over a specified period that are terminated in advance of its contractual maturity date. Accumulated Cost Of Removal Of Utility Plant [Member] Removal Costs [Member] Asset Retirement Obligations [Member] Asset Retirement Obligation Costs [Member] Act 129 Compliance Rider [Member] Act 129 Compliance Rider [Member] Costs incurred in for implementing programs regarding energy efficiency and conservation. These costs are included in allowable costs for rate making purposes. These costs are part of an over-or-under recovery mechanism. Other Regulatory Assets [Member] Other Regulatory Assets [Member] Regulatory Assets [Line Items] Regulatory Assets [Line Items] Current regulatory assets Noncurrent regulatory assets Derivative Instruments, Gain (Loss) By Hedging Relationship, By Income Statement Location, By Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) [Table] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Not Designated As Hedging Instruments [Member] Not Designated as Hedging Instrument [Member] Designated As Hedging Instruments [Member] Designated as Hedging Instrument [Member] Foreign Currency Contracts [Member] Cross Currency Swaps [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Interest Expense [Member] Interest Expense [Member] Other Income (Expense) Net [Member] Other Income Expense Net [Member] The caption reflecting other nonoperating income and expense, net. Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Domain] Other Comprehensive Income Location [Domain] Other Comprehensive Income (Loss) [Member] Other Comprehensive Income (Loss) [Member] Pre-tax Effect Of Derivative Instruments Recognized On Balance Sheet, By Location [Axis] Derivative Instruments Gain Loss By Balance Sheet Location [Axis] The location and amount of gains and losses reported on the balance sheet on derivative instruments. Derivatives Fair Value By Balance Sheet Location [Domain] Derivative Balance Sheet Location [Domain] The balance sheet location of gains and losses on derivative instruments. Regulatory Assets Noncurrent [Member] Regulatory Assets Noncurrent [Member] The amount recorded to noncurrent regulatory assets. Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] Amounts Included In Income Statement Or Other Comprehensive Income [Abstract] Derivative Gain (Loss) Recognized in OCI Other Comprehensive Income (Loss), Unrealized Gain (Loss) On Derivatives Arising During Period, Pre Tax Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments qualifying as cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). Gain (Loss) Reclassified from AOCI into Income Derivative Instruments, Gain (Loss) Reclassified From Accumulated OCI Into Income, Before Tax The pre-tax gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. Gain (loss) recognized in income on derivative Derivative, Gain (Loss) on Derivative, Net Gain (loss) recognized as regulatory liabilities/assets Derivative Instruments Gain Loss Recognized In Regulatory Liabilities Assets The amount of gain (loss) recognized as regulatory assets/liabilities during the period on derivative instruments designated as hedging instruments and not designated as hedging instruments for which regulatory treatment is being applied. Amount of gain (loss) reclassified from AOCI to income Derivative Instruments, Gain (Loss) Reclassified From Accumulated OCI Into Income, Net The net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. Hedged items Hedged Item, Gain (Loss) To Income The gain/(loss) on the hedged item recorded to income. Segment Reporting [Abstract] Segment and Related Information Segment Reporting Disclosure [Text Block] Derivatives, Offsetting Fair Value Amounts, Policy Derivatives, Offsetting Fair Value Amounts, Policy [Policy Text Block] Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Accounts receivable from affiliates [Member] Accounts receivable from affiliates [Member] Financial statement caption encompassing accounts receivable from affiliates. Long Term Debt Type [Axis] Long-term Debt, Type [Axis] Long Term Debt Type [Domain] Long-term Debt, Type [Domain] Note Payable [Member] Note Payable [Member] A written promise to pay a note. Note Payable [Member] Note Payable 1 [Member] A written promise to pay a note. Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] PPL Services [Member] Services Company Affiliate [Member] A subsidiary of the parent that provides services to the parent and the parent's subsidiaries. PPL EU Services [Member] EU Services Company Affiliate [Member] A subsidiary of the parent that provides support services and corporate functions primarily to a subsidiary of the parent and its affiliates. PPL Energy Funding [Member] PPL Energy Funding Corporation [Member] A subsidiary of PPL and the parent holding company of PPL Energy Supply, PPL Global and other subsidiaries. Affiliated Entity [Member] Affiliated Entity [Member] Parent And Affiliate [Member] Parent And Affiliate [Member] Represents activity whereby the parent and an affiliate of the company are providing resources. Examples include when the company participates in an intercompany money pool arrangement with its parent and/or an affiliate. PPL Affiliate [Member] Company Affiliate [Member] Details transactions arising between the entity and an affiliate of the parent company. LKS [Member] L G And E And K U Services Company [Member] A subsidiary of LG&E and KU Energy LLC that provides services to LG&E and KU Energy LLC and its subsidiaries. Related Party Transactions [Line Items] Related Party Transaction [Line Items] Support Costs (Details) [Abstract] Support Costs Details [Abstract] Related Party Transaction, Amounts of Transaction Related Party Transaction, Amounts of Transaction Intercompany Borrowings (Numeric) [Abstract] Intercompany Borrowings Numeric [Abstract] Debt instrument term (in years) Debt Instrument, Term Intercompany note with affiliate maximum borrowing capacity Intercompany Note Affiliate Maximum Borrowing Capacity Maximum loan capacity under the revolving demand note agreement with an affiliate of the reporting entity. Notes Receivable, Related Parties, Current Intercompany Money Pool Agreement Maximum Borrowing Capacity Intercompany Money Pool Agreement Maximum Borrowing Capacity Maximum borrowing capacity under the money pool agreement with an affiliate of the reporting entity. Stated interest rate Debt Instrument, Interest Rate, Stated Percentage Related Party Transaction, Rate Related Party Transaction, Rate VEBA Funds Receivable VEBA Funds Receivable Intercompany receivable related to IRS private letter ruling permitting a transfer of excess funds from the PPL Bargaining Unite Retiree Health Plan VEBA to a new subaccount within the VEBA to be used to pay medical claims of active bargaining unit employees Asset Retirement Obligation Disclosure [Abstract] Disclosure [Table] Disclosure [Table] A table is a schedule used to present multi dimensional data and contains both an axis and line items. Asset Retirement Obligations [Line Items] Asset Retirement Obligations [Line Items] 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. Asset Retirement Obligations Asset Retirement Obligation Disclosure [Text Block] Distributions (Numeric) [Abstract] Distributions Numeric [Abstract] Current quarterly common stock dividend (in dollars per share) Common Stock, Dividends, Per Share, Declared Annualized current quarterly common stock dividend (in dollars per share) Common Stock Dividends Per Share Declared As Per Annum Equivalent The per annum equivalent of the increased quarterly stock dividend the last time the dividend was changed. Financing Activities Debt Disclosure [Text Block] Fair Value Disclosures [Abstract] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Fair Value, by Balance Sheet Grouping Fair Value, by Balance Sheet Grouping [Table Text Block] Assets [Abstract] Current Assets Receivables, Net, Current [Abstract] Accounts receivable reserve for doubtful accounts Accounts Receivable, Allowance for Credit Loss, Current Unbilled Contracts Receivable, Allowance for Credit Loss, Current Unbilled Contracts Receivable, Allowance for Credit Loss, Current Unbilled Contracts Receivable, Allowance for Credit Loss, Current Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, no par value (in dollars per share) Common Stock, No Par Value Common stock shares authorized (in shares) Common Stock, Shares Authorized Common stock shares issued (in shares) Common Stock, Shares, Issued Common stock shares outstanding (in shares) Common Stock, Shares, Outstanding Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] Statement of Comprehensive Income [Abstract] Tax effect of foreign currency translation adjustments arising during the period Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax Tax effect of qualifying derivatives arising during the period Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Tax effect of defined benefit plans - net actuarial gain (loss) arising during the period Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax Tax effect of qualifying derivatives reclassified from AOCI Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax Tax effect of defined benefit plans - prior service costs reclassified from AOCI Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax Tax effect of defined benefit plans - net actuarial (gain) loss reclassified from AOCI Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax Revenue from Contract with Customer [Abstract] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Pennsylvania Regulated [Member] Pennsylvania Regulated [Member] The regulated electric delivery operations of PPL Electric. Also includes PPL's natural gas distribution and propane businesses that were sold in 2008. Kentucky Regulated [Member] Kentucky Regulated [Member] Consists primarily of the activities of LKE's electric generation, transmission and delivery operations primarily in Kentucky and the regulated distribution and sale of natural gas in Kentucky. Scenario [Axis] Scenario [Axis] Scenario [Domain] Scenario [Domain] Forecast [Member] Forecast [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Amount Revenue, Remaining Performance Obligation, Amount Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Revenue from Contracts with Customers [Table] Revenue from contracts with customers [Table] Revenue from contracts with customers [Table] Segments [Axis] Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] Licensed energy suppliers [Member] Licensed energy supplier [Member] Licensed energy supplier [Member] Residential [Member] Residential [Member] Customers who purchase services for private households and apartment buildings. Commercial [Member] Commercial [Member] Customers who purchase services for non-manufacturing business establishments. Industrial [Member] Industrial [Member] Customers who purchase services for the production of goods. Other [Member] Other [Member] Customers who purchase services for miscellaneous purposes. Wholesale - municipal [Member] Wholesale Municipal [Member] Municipalities who purchase services for the purpose of providing services to its citizens. Wholesale - other [Member] Wholesale Other [Member] Energy retailers who purchase services for the purpose of reselling the services to a third-party. Distribution [Member] Distribution [Member] Distribution [Member] Transmission [Member] Transmission [Member] Transmission [Member] Revenue from Contracts with Customers [Line Items] Revenue from contracts with customers [Line Items] [Line Items] for Revenue from contracts with customers [Table] Reconciliation of Revenue from Contracts with Customers [Abstract] Reconciliation of revenue from contacts with customers [Abstract] Reconciliation of revenue from contacts with customers [Abstract] Operating Revenues Alternative Revenue Programs Alternative Revenue Programs Programs that enable the utility to adjust future rates (usually as a surcharge applied to future billings) in response to past activities or completed events. Other Revenue Other Revenue Additional revenues outside the scope of revenues from contracts with customers - which could include, but doesn't have to include leases, late charges, returned checks or other miscellaneous revenues. Disaggregation of Revenue [Abstract] Disaggregation of Revenue [Abstract] Revenues from Contracts with Customers Revenue from Contract with Customer, Excluding Assessed Tax Contract with Customer, Asset and Liability [Abstract] Contract with Customer, Asset and Liability [Abstract] Accounts Receivable, Credit Loss Expense (Reversal) Accounts Receivable, Credit Loss Expense (Reversal) Contract with Customer, Liability Contract with Customer, Liability Contract with Customer, Liability, Revenue Recognized Contract with Customer, Liability, Revenue Recognized New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Other Nonoperating Income (Expense) [Abstract] Other Income (Expense) Net [Line Items] Other Income (Expense) Net [Line Items] Schedule of Other Nonoperating Income (Expense) Schedule of Other Nonoperating Income (Expense) [Table Text Block] Segment and Related Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Interim Financial Statements [Abstract] Interim Financial Statements Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Leases [Abstract] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Utility Rate Regulation [Line Items] Regulated Operations [Line Items] Regulatory Assets and Liabilities Schedule Of Regulatory Assets And Liabilities [Table Text Block] Tabular disclosure of assets and liabilities that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet. Revenue from Contracts with Customers Revenue from Contract with Customer [Text Block] Statement of Cash Flows [Abstract] Cash Flows from Operating Activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net Income Depreciation Depreciation Amortization Amortization Defined benefit plans - (income) expense Pension and Other Postretirement Benefits Expense (Reversal of Expense), Noncash Deferred income taxes and investment tax credits Deferred Income Taxes and Tax Credits Unrealized (gains) losses on derivatives, and other hedging activities Unrealized gains on derivatives, and other hedging activities The non-cash impact from derivative contracts that are included in earnings. Stock-based compensation expense Share-based Payment Arrangement, Noncash Expense Other Other Noncash Income (Expense) Change in current assets and current liabilities Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Receivables Accounts receivable from affiliates Increase (Decrease) in Accounts Receivable, Related Parties Accounts payable Increase (Decrease) in Accounts Payable, Trade Accounts payable to affiliates Increase (Decrease) in Accounts Payable, Related Parties Unbilled revenues Net Change Unbilled Revenues The net change during the reporting period in the unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. Fuel, materials and supplies Increase (Decrease) in Inventories Prepayments Increase (Decrease) in Prepaid Expense Regulatory assets and liabilities, net Increase (Decrease) in Regulatory Assets and Liabilities Taxes payable Increase (Decrease) in Accrued Taxes Payable Accrued interest Increase (Decrease) in Interest Payable, Net Other current liabilities Increase (Decrease) in Other Current Liabilities Other Increase (Decrease) in Other Operating Assets and Liabilities, Net Other operating activities Other Operating Activities [Abstract] Defined benefit plans - funding Payment for Pension Benefits Expenditures for asset retirement obligations Asset Retirement Obligation, Cash Paid to Settle Other assets Increase (Decrease) in Other Noncurrent Assets Other liabilities Increase (Decrease) in Other Noncurrent Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash Flows from Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Expenditures for property, plant and equipment Payments to Acquire Property, Plant, and Equipment Net (increase) decrease in notes receivable from affiliate Net (increase) decrease in notes receivable from affiliate The change in cash during the period due to the net increase or decrease in notes receivable by a related party. Related parties, include, but are not limited to, affiliates, owners or officers and their immediate families, and pension trusts. Purchase of investments Payments to Acquire Investments Proceeds from the sale of investments Proceeds from Sale, Maturity and Collection of Investments Expenditures for intangible assets Payments to Acquire Intangible Assets Other investing activities Payments for (Proceeds from) Other Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash Flows from Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Net increase (decrease) in notes payable with affiliate Increase Decrease In Notes Payable To Affiliates The change in cash during the period due to the net increase or decrease in notes payable by a related party. Related parties, include, but are not limited to, affiliates, owners or officers and their immediate families, and pension trusts. Distributions to member Payments of Distributions to Affiliates Issuance of common stock Proceeds from Issuance of Common Stock Payment of common stock dividends Payments of Ordinary Dividends, Common Stock Issuance of term loan Proceeds from Short-term Debt, Maturing in More than Three Months Payment of common stock dividends to parent SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees Net increase (decrease) in short-term debt Proceeds from (Repayments of) Short-term Debt Net increase (decrease) in short-term debt Proceeds from (Repayments of) Short-term Debt, Maturing in Three Months or Less Contributions from parent Proceeds from Contributions from Parent Other financing activities Proceeds from (Payments for) Other Financing Activities Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Effect of Exchange Rates on Cash, Cash Equivalents and Restricted Cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash and Cash Equivalents, Period Increase (Decrease) Cash and Cash Equivalents, Period Increase (Decrease) Cash and Cash Equivalents at Beginning of Period Cash and Cash Equivalents at End of Period Cash, Cash Equivalents and Restricted Cash at Beginning of Period Cash, Cash Equivalents and Restricted Cash at End of Period Supplemental Disclosures of Cash Flow Information Supplemental Cash Flow Information [Abstract] Accrued expenditures for property, plant and equipment at March 31, Capital Expenditures Incurred but Not yet Paid Accrued expenditures for intangible assets at March 31, Intangible Asset Expenditures Incurred But Not Yet Paid Future cash outflow to pay for purchases of intangible assets that have occurred. Document Entity Information [Abstract] Document Entity [Table] Document Entity [Table] Container to support the formal attachment of each official or unofficial, public or private document as part of a submission package and assemble all relevant information about each entity associated with the document instance. Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Stock [Member] Common Stock [Member] 2013 Series B Junior Subordinated Notes due 2073 [Member] 2013 Series B Due 2073 [Member] 2013 Series B Due 2073 [Member] 2007 Series A Junior Subordinated Notes due 2067 [Member] 2007 Series A Due 2067 [Member] 2007 Series A Due 2067 [Member] Document Entity Information [Line Items] Document Entity Information [Line Items] 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. Title of 12(b) Security Title of 12(b) Security Entity Shell Company Entity Shell Company Entity Interactive Data Current Entity Interactive Data Current Entity File Number Entity File Number Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Incorporation State Country Code 1 Two-character EDGAR code representing the state or country of incorporation. 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 Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Entity Registrant Name Entity Registrant Name Entity Tax Identification Number Entity Tax Identification Number Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Document Quarterly Report Document Quarterly Report Document Transition Report Document Transition Report Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Other Income (Expense) - net Other Income Other Expense Disclosure Nonoperating [Text Block] Disclosure of the detailed components of other nonoperating income and other nonoperating expenses. May include methodology, assumptions and amounts for: (a) dividends, (b) interest on securities, (c) profits on securities (net of losses), (d) miscellaneous other income items, (e) losses on securities (net of profits) and (f) miscellaneous income deductions. Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Fair Value By Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Financial Instruments Not Recorded at Fair Value, Other [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Carrying Amount [Member] Reported Value Measurement [Member] Fair Value [Member] Estimate of Fair Value Measurement [Member] Fair Value of Financial Instruments Not Recorded at Fair Value - Other Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Debt Instrument, Fair Value Disclosure Debt Instrument, Fair Value Disclosure Income Taxes Income Tax Disclosure [Text Block] Intercompany Support Cost Allocations Schedule Of Intercompany Support Cost Allocations [Table Text Block] Tabular disclosure of support cost allocations from parent to subsidiary and between affiliates during the period. Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Reclassification out of Other Comprehensive Income (Loss) Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Reconciliation of Revenue from Contracts with Customers [Table Text Block] Reconciliation of revenue from contracts with customers [Table Text Block] [Table Text Block] for Reconciliation of revenue from contracts with customers [Table] Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table Text Block] Credit Loss Recognized from Contracts with Customers [Table Text Block] Credit loss recognized from contract with customer [Table Text Block] Credit loss recognized from contract with customer [Table Text Block] Contract with Customer, Asset and Liability [Table Text Block] Contract with Customer, Asset and Liability [Table Text Block] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Fair Value By Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value By Measurement Frequency [Domain] Measurement Frequency [Domain] Recurring Fair Value Measurements [Member] Fair Value, Recurring [Member] Fair Value By Fair Value Hierarchy Level [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value By Fair Value Hierarchy Level [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] Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Cash collateral posted to counterparties Other Assets, Fair Value Disclosure Restricted cash and cash equivalents Fair Value Assets Measured On Recurring Basis Restricted Cash And Cash Equivalents The combined current and noncurrent carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Special Use Funds [Abstract] Special Use Funds [Abstract] -- None. No documentation exists for this element. -- Money market fund Fair Value Asset Measured On Recurring Basis Limited To Use Money Market The combined current and noncurrent carrying amounts of special use funds that are limited in use which are invested in money markets. Commingled debt fund measured at NAV Fair Value Assets Measured Using Net Asset Value Limited To Use Commingled Debt Fund The combined current and noncurrent asset amounts that have been measured at their fair value using net asset value as of the measurement date that are invested in commingled debt funds. Commingled equity fund measured at NAV Fair Value Assets Measured Using Net Asset Value Limited To Use Commingled Equity Fund The combined current and noncurrent asset amounts that have been measured at their fair value using net asset value as of the measurement date that are invested in commingled equity funds. Total special use funds Health Care Trust Fund, Assets Limited To Use Total healthcare trust fund assets that are limited in use. Price risk management assets: Price Risk Management Assets [Abstract] Foreign currency contracts Foreign Currency Contract, Asset, Fair Value Disclosure Cross-currency swaps Fair Value Assets Measured On Recurring Basis Cross Currency Swaps Fair value of assets related to derivative instruments whose primary underlying risk is tied to interest rates and foreign exchange rates. Total price risk management assets Fair Value Assets Measured On Recurring Basis Derivative Financial Instruments Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments. Total Assets Assets, Fair Value Disclosure Liabilities Liabilities [Abstract] Price risk management liabilities: Liabilities Price Risk Management Liabilities [Abstract] Interest rate swaps Interest Rate Derivative Liabilities, at Fair Value Foreign currency contracts Foreign Currency Contracts, Liability, Fair Value Disclosure Total price risk management liabilities Derivative Liability, Fair Value, Gross Liability Retirement Benefits [Abstract] Schedule Of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Retirement Plan Tax Status [Axis] Retirement Plan Tax Status [Axis] Retirement Plan Tax Status [Domain] Retirement Plan Tax Status [Domain] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Pension Plan [Member] Pension Plan [Member] Other Postretirement Benefits Plan [Member] Other Postretirement Benefits Plan [Member] Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] Domestic Plan [Member] Domestic Plan [Member] U.S. UNITED STATES Foreign Plan [Member] Foreign Plan [Member] U.K. UNITED KINGDOM Plan Sponsor [Axis] Plan Sponsor [Axis] The set of plan sponsors associated with the report. Plan Sponsor [Domain] Plan Sponsor [Domain] All the names of the plan sponsors being reported upon in a document. LKE [Member] Louisville Gas And Electric And Kentucky Utilities Energy LLC [Member] An direct wholly owned subsidiary of PPL, a holding company which owns and operates regulated public utilities engaged in the generation, transmission, distribution and sale of electricity and the distribution and sale of natural gas primarily in Kentucky. Defined Benefits [Line Items] Defined Benefit Plan Disclosure [Line Items] Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] Defined Benefit Plan [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: [Abstract] Amortization Of [Abstract] Prior service cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Actuarial loss Defined Benefit Plan, Amortization of Gain (Loss) Net Periodic Defined Benefit Costs (Credits) Prior To Settlements Net Periodic Defined Benefit Costs (Credits) Prior To Settlements The total amount of net periodic benefit cost for defined benefit plans for the period, excluding settlements. Settlements Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement Net periodic defined benefit costs (credits) Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Regulatory Asset Amortization Period Regulatory Asset, Amortization Period Deferred recovery of the difference between pension costs calculated with pension accounting policy and pension cost using 15 year amortization period Deferred recovery of the difference between pension costs calculated with pension accounting policy and pension cost using 15 year amortization period Amount of deferred recovery of the difference between the pension cost calculated in accordance with the entities pension accounting policy and pension cost using a 15 year amortization period for actuarial gains and losses. Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract] Net Periodic Defined Benefit Costs Allocated To Subsidiary By Sponsor Numeric [Abstract] Costs allocated to subsidiary by plan sponsors Defined Benefit Plan Costs Allocated To Subsidiary By Plan Sponsors Total amount of net periodic benefit cost for defined benefit plans for the period allocated to subsidiary. Other Liabilities Disclosure [Abstract] Common Stock Aggregate Sales Price Common Stock Aggregate Sales Price Aggregate amount of common stock that the company may sell from time to time based on two separate equity distribution agreements. Maximum Percentage Paid To Selling Agents Maximum Percentage Paid To Selling Agents Maximum percentage of gross offering proceeds of the shares sold which is paid to selling agents with respect to each equity distribution agreement. Common stock issued Stock Issued During Period, Shares, New Issues Basic and Diluted EPS Computations Schedule Of Earnings Per Share Basic And Diluted Computations And Reconciliations [Table Text Block] Tabular disclosure of an entity's basic and diluted earnings per share computations and reconciliation of basic net earnings per share (or unit) to diluted earnings per share (or unit). Common Stock Issuances Schedule Of Common Stock Issuances [Table Text Block] Tabular disclosure of the number of shares issued during the period related to stock-based compensation plans, employee stock ownership plans or dividend reinvestment and direct stock purchase plans. Antidilutive Securities Excluded From Diluted EPS Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule Of Segment Reporting Information, By Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Segment and Related Information [Line Items] Segment Reporting Information [Line Items] Income Statement Data [Abstract] Segment Reporting Information, Profit (Loss) [Abstract] Operating Revenues from external customers Balance Sheet Data [Abstract] Segment Reporting Information Balance Sheet Data [Abstract] Assets Segment (Numeric) [Abstract] Segment Reporting Information, Additional Information [Abstract] Net property, plant and equipment not subject to accounting for the effects of certain types of regulation Segment Assets Property Plant And Equipment Not Subject To Effects Of Certain Type Of Regulation Amount of property, plant and equipment of a regulated segment that are not subject to accounting for the effects of certain types of regulation as prescribed by United Stated Generally Accepted Accounting Principles. Number of Reportable Segments Number of Reportable Segments Number of Operating Segments Number of Operating Segments Adoption of Accounting Guidance [Abstract] Adoption of Accounting Guidance [Abstract] Financing Receivable, Allowance for Credit Loss [Table Text Block] Financing Receivable, Allowance for Credit Loss [Table Text Block] Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow [Table Text Block] [Table Text Block] for Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow [Table] Foreign currency translation adjustments [Member] Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Unrealized gains (losses) on qualifying derivatives [Member] Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Defined benefit plans Prior service costs [Member] Accumulated Defined Benefit Plans Prior Service Costs [Member] Changes to accumulated comprehensive income related to prior service costs. Defined benefit plans Actuarial gain (loss) [Member] Accumulated Defined Benefit Plans Actuarial Gain Loss [Member] Changes to accumulated comprehensive income related to actuarial gain (loss). Balance at beginning of period Amounts arising during the period Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Reclassifications from AOCI Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Net OCI during the period Other Comprehensive Income (Loss), Net of Tax Balance at end of period Purchases Of Accounts Receivable [Table] Purchases Of Accounts Receivable [Table] A table or schedule providing information pertaining to a purchase of accounts receivable program. Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Unaffiliated Third Party Entity [Member] Unaffiliated Third Party Entity [Member] An entity or party to a transaction that is not affiliated with the reporting entity. Purchases Of Accounts Receivable [Line Items] Purchases Of Accounts Receivable [Line Items] Accounts receivable purchased under a Public Utility Commission-approved program whereby certain accounts receivable are purchased and recorded at fair value from affiliated or unaffiliated alternative suppliers at a nominal discount. Purchases of Accounts Receivable Purchases of Accounts Receivable Represents purchases, under a PUC-approved program, of certain accounts receivable from alternative provider of last resort suppliers at a nominal discount, which reflects a provision for uncollectible accounts. Schedule Of Regulatory Liabilities [Table] Schedule of Regulatory Liabilities [Table] Regulatory Liabilities [Axis] Regulatory Liability [Axis] Regulatory Liabilities [Domain] Regulatory Liability [Domain] Generation Supply Charge [Member] Generation Supply Charge [Member] Costs incurred in obtaining generation supply for customers who do not shop for their own that would otherwise be charged to expense. These costs are included in allowable costs for rate making purposes. These costs are part of an over-or-under recovery mechanism. Environmental Cost Recovery [Member] Environmental Cost Recovery [Member] Costs associated with complying with the Federal Clean Air Act and other federal, state or local environment requirements. Includes those that apply to coal combustion wastes and by-products from facilities that utilized for the production of energy from coal. Demand Side Management [Member] Demand Side Management [Member] The costs associated with reducing electricity use through activities or programs that promote electric energy efficiency or conservation, or more efficient management of electric energy loads. Universal Service Rider [Member] Universal Service Rider [Member] Costs incurred in for universal service programs including low-income programs. These costs are included in allowable costs for rate making purposes. These costs are part of an over-or-under recovery mechanism. Fuel adjustment clause [Member] Deferred Fuel Costs [Member] TCJA customer refund [Member] TCJA surcredit [Member] Estimated amounts owed to customers as a result of the reduced U.S. federal corporate income tax rate as enacted by the TCJA, effective January 1, 2018, not yet reflected in customer rates. Storm Damage Expense Rider [Member] Storm Damage Expense [Member] Capitalization or accrual of uninsured storm damage costs that future treatment of these amounts is pending with the regulatory authority. Power Purchase Agreement OVEC [Member] Power Purchase Agreement Ohio Valley Electric Corporation [Member] The fair value of the OVEC power purchase agreement recorded in a business combination that will be amortized as the related contract. A liability relates to the contract having an original cost lower than market price when purchase accounting was recorded. Net deferred taxes [Member] Net Deferred Tax Assets [Member] The regulatory liability associated with net deferred tax assets represents the future revenue impact from the reversal of deferred income taxes required primarily for unamortized investment tax credits. This regulatory liability is recognized when the offsetting deferred tax asset is recognized. For general-purpose financial reporting, this regulatory liability and the deferred tax asset are not offset; rather, each is displayed separately. Terminated interest rate swaps [Member] Other Regulatory Liabilities [Member] Other Regulatory Liabilities [Member] Represents regulatory liabilities not otherwise specified in the taxonomy. Regulatory Liabilities [Line Items] Regulatory Liabilities [Line Items] Current regulatory liabilities Noncurrent regulatory liabilities Lessor, Lease, Description [Table] Lessor, Lease, Description [Table] Lessor, Lease, Description [Line Items] Lessor, Lease, Description [Line Items] Income (Numerator) [Abstract] Income Numerator [Abstract] Less amounts allocated to participating securities Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Net income available to PPL common shareowners - Basic Net Income Available To Common Shareowners Net income available to common shareowners. Net income available to PPL common shareowners - Diluted Net Income (Loss) Available to Common Stockholders, Diluted Shares of Common Stock (Denominator) [Abstract] Shares of Common Stock Denominator [Abstract] Weighted-average shares - Basic EPS (in shares) Add incremental non-participating securities: [Abstract] Add Incremental Non Participating Securities [Abstract] Share-based payment awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Forward sale agreements Incremental Common Shares Attributable to Dilutive Effect of Equity Forward Sales Agreements Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of equity forward arrangements using the treasury stock method. Weighted-average shares - Diluted EPS (in shares) Basic EPS - Available to PPL common shareowners: [Abstract] Earnings Per Share, Basic [Abstract] Net Income Available to PPL common shareowners (in dollars per share) Diluted EPS - Available to PPL common shareowners: [Abstract] Earnings Per Share, Diluted [Abstract] Net Income Available to PPL common shareowners (in dollars per share) Shares Issued (Numeric) [Abstract] Shares Issued Numeric [Abstract] Common stock issued under stock-based compensation plans (in shares) Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Common stock issued under DRIP (in shares) Stock Issued During Period, Shares, Dividend Reinvestment Plan Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities Excluded From Computation Of Earnings Per Share, By Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Stock Options [Member] Share-based Payment Arrangement, Option [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Shares excluded from the computations of diluted EPS Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Cause Of Valuation Allowance [Axis] Cause Of Valuation Allowance [Axis] Cause Of Valuation Allowance [Axis] Cause Of Valuation Allowance [Domain] Cause Of Valuation Allowance [Domain] [Domain] for Cause Of Valuation Allowance [Axis] Reconciliation of Income Tax Expense [Abstract] Effective Income Tax Rate Reconciliation, Percent [Abstract] Federal income tax on Income Before Income Taxes at statutory tax rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Increase (decrease) due to: [Abstract] Increase Decrease Due To [Abstract] State income taxes, net of federal income tax benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Valuation allowance adjustments Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Impact of lower U.K. income tax rates relative to U.S. income tax rates Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount Amortization of excess deferred income taxes Amortization Of Excess Deferred Income Taxes The portion of the difference between total income tax expense (benefit) as reported in the Income Statement for the current period and the expected income tax expense (benefit) computed attributable to the amortization of excess deferred income taxes due to a change in the federal corporate income tax rate. Other Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Total increase (decrease) Total Increase Decrease To Federal Income Tax On Income From Continuing Operations At Statutory Tax Rate The total of increases (decreases) to federal income tax on income from continuing operations before income taxes at statutory tax rate. Total income tax expense (benefit) Other Nonoperating Income (Expense) [Table] Other Nonoperating Income (Expense) [Table] Other Nonoperating Income (Expense) Other Income Other Income, Nonoperating [Abstract] Economic foreign currency exchange contracts Gain (Loss) from Price Risk Management Activity Defined benefit plans - non-service credits Defined Benefit Plan Net Periodic Benefit Cost (Credit) NonService The non-service cost components of net periodic defined benefit costs (credits) (interest cost, expected return on plan assets, amortization of prior service cost and amortization of actuarial loss) that are presented in "Other Income (Expense) - net" on the Statements of Income. Interest Income Interest Income, Other AFUDC - equity component Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity Miscellaneous OtherNonoperatingIncomeMiscellaneous The aggregate amount of other income amounts, the components of which are not separately disclosed. Total Other Income Other Nonoperating Income Other Expense Other Expense, Nonoperating [Abstract] Charitable Contributions Charitable Contributions Amount for contributions made to charitable organizations. Miscellaneous Other Nonoperating Expense Miscellaneous The aggregate amount of other expense amounts, the components of which are not separately disclosed. Total Other Expense Other Nonoperating Expense Other Income (Expense) - net Line of Credit Facility [Table] Line of Credit Facility [Table] WPD PLC [Member] Western Power Distribution Public Limited Company [Member] An indirect U.K. subsidiary of PPL Global. Its principal indirectly owned subsidiaries are WPD (East Midlands), WPD (South Wales), WPD (South West) and WPD (West Midlands). WPD South West [Member] WPD South West [Member] An indirect wholly owned United Kingdom subsidiary (South West) of PPL and a regional electricity distribution utility company. WPD East Midlands [Member] WPD East Midlands [Member] An indirect wholly owned United Kingdom subsidiary (East Midlands) of PPL and a regional electricity distribution utility company. WPD West Midlands [Member] WPD West Midlands [Member] An indirect wholly owned United Kingdom subsidiary (West Midlands) of PPL and a regional electricity distribution utility company. Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] UNITED KINGDOM UNITED STATES Credit Facility Description [Axis] Credit Facility Description [Axis] Information on the name and description of credit facility. Credit Facility Description [Domain] Credit Facility Description [Domain] Description of the credit facility. Syndicated Credit Facility [Member] Syndicated Credit Facility [Member] Syndicated credit facility which provides the company the ability to make cash borrowings and to request the lenders to issue letters of credit. Uncommitted Credit Facilities [Member] Uncommitted Credit Facilities [Member] Uncommitted credit facilities. Term Loan Facility [Member] Term Loan Facility [Member] Term Loan Facility which provides the company the ability to make cash borrowings. Bilateral Credit Facility [Member] Revolving Credit Facility [Member] Bilateral Credit Facility [Member] Bilateral Credit Facility [Member] Arrangement in which loan proceeds can continuously be obtained following repayments, but the total amount borrowed cannot exceed a specified maximum amount. Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Capacity Line of Credit Facility, Maximum Borrowing Capacity Borrowed Long-term Line of Credit Letters of Credit and Commercial Paper Issued Line of Credit Facility Amount of Letters of Credit Issued Aggregate amount of letters of credit issued under a credit facility as of the balance-sheet date, if applicable and inclusion of amounts issued under separate commercial paper program that reduces this facilities capacity. Unused Capacity Line of Credit Facility, Remaining Borrowing Capacity Interest rate on outstanding borrowing Line of Credit Facility, Interest Rate at Period End Borrowed Line Of Credit1 The carrying value as of the date borrowed of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. Fair Values Derivatives Balance Sheet Location By Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Current Assets [Member] Current Assets [Member] Line item in the statement of financial position representing assets which are expected to be realized within one year. Noncurrent Assets [Member] Noncurrent Assets [Member] Line item in the statement of financial position representing assets which are expected to be realized longer than one year. Current Liabilities [Member] Current Liabilities [Member] Line item in the statement of financial position representing liabilities which are expected to be paid or settled within one year. Noncurrent Liabilities [Member] Noncurrent Liabilities [Member] Line item in the statement of financial position representing total liabilities which are expected to be paid or settled after one year. Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Fair Values by Balance Sheet Location [Abstract] Fair Values By Balance Sheet Location [Abstract] Asset value Derivative Asset, Fair Value, Gross Asset Liability value Lease Cost [Abstract] Lease, Cost [Abstract] Lessee, Operating Lease, Liability, Payment, Due [Abstract] Lessee, Operating Lease, Liability, Payment, Due [Abstract] Assets and Liabilities, Lessee [Abstract] Assets and Liabilities, Lessee [Abstract] Asset Retirement Obligations [Table] Asset Retirement Obligations [Table] Describes the details pertaining to asset retirement obligations. Asset Retirement Obligation [Line Items] Asset Retirement Obligation [Line Items] Asset Retirement Obligation [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Balance at Beginning of Period Asset Retirement Obligation Accretion Asset Retirement Obligation, Accretion Expense Changes in estimated timing or cost Asset Retirement Obligation, Revision of Estimate Obligations settled Asset Retirement Obligation, Liabilities Settled Balance at End of Period Long Term Debt Details [Table] Schedule of Long-term Debt Instruments [Table] LGE [Member] Currency [Axis] Currency [Axis] All Currencies [Domain] All Currencies [Domain] Senior Notes [Member] Senior Notes [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Term Loan Due 2022 [Member] Term Loan Due 2022 [Member] Term Loan Due 2022 [Member] Senior Notes Due 2030 [Member] Senior Notes Due 2030 [Member] A debt obligation maturing in 2030. Long Term Debt Activity [Axis] Long Term Debt Activity [Axis] Defines the activity of long-term debt. Long Term Debt Activity [Domain] Long Term Debt Activity [Domain] Activity of long-term debt, such as remarketings or exchanges. Debt Instrument [Line Items] Debt Instrument [Line Items] Long-term Debt (Numeric) [Abstract] Debt Instruments [Abstract] Principal amount Debt Instrument, Face Amount Proceeds from Issuance of Secured Debt Proceeds from Issuance of Secured Debt Fair Value Measurements Fair Value Disclosures [Text Block] Guarantees Schedule of Guarantor Obligations [Table Text Block] Offsetting Assets And Liabilities [Table] Offsetting Assets And Liabilities [Table] Tabular disclosure of derivative and other financial assets and liabilities that are subject to offsetting, including master netting arrangements. Treasury Derivatives [Member] Swap [Member] Offsetting Assets And Liabilities [Line Items] Offsetting Assets And Liabilities [Line Items] Assets [Abstract] Offsetting Derivative Assets [Abstract] Gross Derivative instruments - eligible for offset Derivative Asset, Not Offset, Policy Election Deduction Cash collateral received - eligible for offset Derivative, Collateral, Obligation to Return Cash Net Derivative Asset Liabilities [Abstract] Offsetting Derivative Liabilities [Abstract] Gross Derivative instruments - eligible for offset Derivative Liability, Not Offset, Policy Election Deduction Cash collateral pledged - eligible for offset Derivative, Collateral, Right to Reclaim Cash Net Derivative Liability Derivative Credit Risk Related Contingent Features [Table] Derivative Credit Risk Related Contingent Features [Table] Schedule of credit-risk-related contingent features related to derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) that are in a net liability position at the end of the reporting period. Derivative Credit Risk Related Contingent Features [Line Items] Derivative Credit Risk Related Contingent Features [Line Items] Credit Risk-Related Contingent Features [Abstract] Derivative, Credit Risk Related Contingent Features [Abstract] Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features Derivative Net Liability Position Aggregate Fair Value Alternative The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. Aggregate fair value of collateral posted on these derivative instruments Collateral Already Posted, Aggregate Fair Value Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade Additional Collateral, Aggregate Fair Value Utility Rate Regulation Public Utilities Disclosure [Text Block] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Accumulated Other Comprehensive Loss [Member] AOCI Attributable to Parent [Member] Dividends Declared Per Share of Common Stock (in dollars per share) Balance at beginning of period - shares Balance at beginning of period Balance at beginning of period Common stock shares issued Common stock issued Stock Issued During Period, Value, New Issues Stock-based compensation Stock-based compensation Changes related to share-based payment arrangements, including current period stock compensation expense reflected in the statement of income and the tax benefit associated with these payment arrangements. Capital contributions from parent Capital Contributions From Parent Amount of equity impact as a source of financing from parent that is recorded as additional paid in capital. Dividends and dividend equivalents Dividends Dividends declared on common stock Dividends Common Stock Cash And Non Cash Amount of paid and unpaid common stock dividends declared. Distributions to member Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared Other comprehensive income (loss) Balance at end of period - shares Balance at end of period Balance at end of period Cumulative Effect of New Accounting Principle in Period of Adoption Cumulative Effect of New Accounting Principle in Period of Adoption Schedule of Line of Credit Facilities Schedule of Line of Credit Facilities [Table Text Block] Schedule of Short-term Debt Schedule of Short-term Debt [Table Text Block] Asset Retirement Obligation Roll Forward Schedule of Change in Asset Retirement Obligation [Table Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Master Netting Arrangements [Table] Master Netting Arrangements [Table] Master Netting Arrangements (Numeric) [Line Items] Master Netting Arrangements Numeric [Line Items] Cash collateral obligation under master netting arrangements Cash colleteral posted under master netting arrangements Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Schedule Of Net Periodic Defined Benefit Costs (Credits) Schedule of Defined Benefit Plans Disclosures [Table Text Block] Allocation of Net Periodic Benefit Costs Schedule Of Net Periodic Benefit Costs Allocation [Table Text Block] Tabular disclosure of net periodic benefit cost allocated to affiliates by the plan-sponsoring entity. These amounts include amounts applied to accounts that are further distributed between capital and expense during the period. Reclassification Out Of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Qualifying Derivatives [Member] Defined Benefit Plans [Member] Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Prior Service Costs [Member] Net Actuarial Loss [Member] Reclassification Out Of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification Out Of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Amounts Reclassified From Accumulated Other Comprehensive Income [Member] Reclassification out of Accumulated Other Comprehensive Income [Member] Affected Line Item on the Statements of Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Interest Expense Total Pre-tax Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income Taxes Total After-tax Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Amounts arising during the period - gains (losses), net of tax (expense) benefit: Amounts Arising During Period Gains Losses Net Of Tax Expense Benefit [Abstract] Foreign currency translation adjustments, net of tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Qualifying derivatives, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Defined benefit plans: Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax [Abstract] Defined benefit plan, Net actuarial gain (loss), net of tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax Reclassifications from AOCI - (gains) losses, net of tax expense (benefit): Other Comprehensive Income Loss Reclassifications To Net Income Loss Net Of Tax [Abstract] Qualifying derivatives, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Defined benefit plans: Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract] Defined benefit plan, Prior service costs, net of tax Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax Defined benefit plan, Net actuarial (gain) loss, net of tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax Total other comprehensive income (loss) Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Accounting Changes and Error Corrections [Abstract] Environmental Matters [Table] Environmental Matters [Table] Describes the details pertaining to environmental matters. Environmental Remediation Site [Axis] Environmental Remediation Site [Axis] Environmental Remediation Site [Domain] Environmental Remediation Site [Domain] PPL Electric Additional Sites [Member] PPL Electric Additional Sites [Member] Additional sites previously owned or operated by PPL Electric predecessors or affiliates. Environmental Matters [Line Items] Environmental Matters [Line Items] Environmental Matters - Air (Numeric) [Abstract] Environmental Matters Domestic Air Numeric [Abstract] Environmental Matters - Water/Waste - Coal Combustion Residuals (Numeric) [Abstract] Environmental Matters Water Waste Coal Combustion Residuals Numeric [Abstract] Environmental Matters - Superfund and Other Remediation (Numeric) [Abstract] Environmental Matters Superfund And Other Remediation Numeric [Abstract] Accrual for Environmental Loss Contingencies Accrual for Environmental Loss Contingencies Other - Labor Union Agreements (Numeric) [Abstract] Other - Labor Unions [Abstract] Other - Labor Unions [Abstract] Credit Loss, Financial Instrument [Text Block] Credit Loss, Financial Instrument [Policy Text Block] New Accounting Pronouncements, Policy New Accounting Pronouncements, Policy [Policy Text Block] Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Legal Matters [Table] Legal Matters [Table] Describes the details pertaining to legal matters. Legal Matters [Line Items] Legal Matters [Line Items] Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] Legal Matters Cane Run Environmental Claims Numeric [Abstract] Number of residents that filed class action suit Cane Run Plant Number Of Plaintiffs Filed Suit Number of plaintiffs that have filed claims pertaining to a loss contingency at the Can Run plant. Number of miles within plant that would include a class of residents Can Run Plant Class Of Residents Miles Within Plant The number of miles surrounding the plant that a class of plaintiffs could include in a class action suit. Number of remaining unresolved Clean Air Act violation claims after July 2014 court ruling Cane Run Plant Number Of Unresolved Clean Air Act Violations The number of Clean Air Act violation claims that remains unresolved after a July 2014 court ruling. Generating units retired at the Cane Run plant Generating Units Retired Plant One The number of coal-fired generating units retired at the Cane Run plant. Claim By Former Affiliate [Abstract] Claim By Former Affiliate [Abstract] Claim By Former Affiliate [Abstract] Percent of ownership of Talen Energy by Riverstone Restructuring And Related Activities Ownership Percentage By Riverstone Initial ownership percentage in new company, Talen Energy, by Riverstone Holdings, LLC upon completion of spinoff transaction. Amount of alleged improper distribution Amount Of Alleged Improper Distribution The amount of the alleged improper distribution of the proceeds from the November 2014 sale of Talen Montana's (then PPL Montana's) hydroelectric generating facilities to PPL's subsidiaries. Defined Benefits Pension and Other Postretirement Benefits Disclosure [Text Block] Related Party Transactions Related Party Transactions Disclosure [Text Block] Earnings Per Share Earnings Per Share [Text Block] Derivative Instruments And Hedging Activities [Line Items] Derivative Instruments And Hedging Activities [Line Items] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Derivative Instruments, Gain (Loss) Derivative Instruments, Gain (Loss) [Table Text Block] Derivative Positions Eligible for Offset with Related Cash Collateral Offsetting Assets And Liabilities [Table Text Block] Tabular disclosure of derivative and other financial assets and liabilities that are subject to offsetting, including master netting arrangements. Credit Risk-Related Contingent Features Credit Risk Related Contingent Features [Table Text Block] Tabular disclosure of amounts of credit-risk-related contingent features related to derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) that are in a net liability position at the end of the reporting period. Regulatory Matters [Table] Regulatory Matters [Table] Describes the details pertaining to regulatory matters. Regulatory Agency [Axis] Regulatory Agency [Axis] Regulatory Agency [Domain] Regulatory Agency [Domain] Kentucky Public Service Commission [Member] Kentucky Public Service Commission [Member] The state agency that oversees the regulation of rates and services of utilities in Kentucky. Schedule Of Regulatory Items With Shared Characteristics [Axis] Schedule Of Regulatory Items With Shared Characteristics [Axis] The list of regulatory related items that can either be a regulatory assets or liabilities or both on the balance sheet. These amounts would otherwise be required to appear on the company's income statement and would be charged against current expenses or revenues. Schedule Of Regulatory Items With Shared Characteristics [Domain] Schedule Of Regulatory Items With Shared Characteristics [Domain] A table of regulatory related items that can either be a regulatory assets or liabilities or both on the balance sheet. These amounts would otherwise be required to appear on the company's income statement and would be charged against current expenses or revenues. Project Name [Axis] Project Name [Axis] Project Name [Axis] Project Name [Domain] Project Name [Domain] [Domain] for Project Name [Axis] Rates Type [Axis] Rates Type [Axis] The description of the types of services provided by a utility for which rate changes are periodically requested. Rates Type [Domain] Rates Type [Domain] The names of the types of services provided by a utility for which rate changes are periodically requested. Tax Reform [Axis] Tax Reform [Axis] Tax Reform [Axis] Tax Reform [Domain] Tax Reform [Domain] Domain for Tax Reform Axis Regulatory Matters [Line Items] Regulatory Matters [Line Items] Public Utilities Expected Capital Costs To Comply Public Utilities Expected Capital Costs To Comply Estimated amount of capitalized costs for construction projects. Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] Regulatory Matters Kentucky Activities Rate Case Proceedings [Abstract] Regulatory Matters Kentucky Activities Rate Case Proceedings [Abstract] Public Utilities, Requested Return on Equity, Percentage Public Utilities, Requested Return on Equity, Percentage