2.4.0.8400605 - Disclosure - Utility Rate Regulation (Regulatory Matters) (Details)truefalsefalse1false USDfalsefalse$FROM_Apr01_2013_TO_Jun30_2013http://www.sec.gov/CIK0000922224duration2013-04-01T00:00:002013-06-30T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$FROM_Jan01_2013_TO_Jun30_2013http://www.sec.gov/CIK0000922224duration2013-01-01T00:00:002013-06-30T00:00:00IntegerStandardhttp://pplweb.com/20130630Integerppl0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0YearsStandardhttp://www.xbrl.org/2009/utrYutr0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false USDfalsefalse$AS_OF_Dec31_2012http://www.sec.gov/CIK0000922224instant2012-12-31T00:00:000001-01-01T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 4ppl_RegulatoryMattersPennsylvaniaActivitiesStormDamageExpenseRiderNumericAbstractppl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Regulatory Matters - Pennsylvania Activities - Storm Damage Expense Rider (Numeric) [Abstract]2false 5ppl_RegulatorMattersStormDamageExpenseRiderMaximumPeriodppl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse9090falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:integerItemTypeintegerThe period, in days, allowable to file a proposed Storm Damage Expense Rider as directed by the applicable regulatory agency.No definition available.false256Maximum period to file proposed Storm Damage Expense Rider (in days)3true 4ppl_RegulatoryMattersPennsylvaniaActivitiesAct129NumericAbstractppl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Regulatory Matters - Pennsylvania Activities - Act 129 (Numeric) [Abstract]4false 5ppl_ProposedCostRecoveryCapOverYear2006Revenueppl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truetruefalse0.020.02falsefalsefalse3falsefalsefalse00falsefalsefalsenum:percentItemTypepureUnder Act 129, cap on costs incurred (as percentage of 2006 revenue) for implementation of Energy Efficiency and Conservation Plans (EE and C) that can be recovered through rates.No definition available.false0Under Act 129, percentage cap on costs that can be recovered for implementation of EE and C plan5false 5ppl_PercentageOfReducedElectricityConsumptionRequiredByAct129By2011ppl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truetruefalse0.0100.010falsefalsefalse3falsefalsefalse00falsefalsefalsenum:percentItemTypepureUnder Act 129, percentage reduction in electricity consumption by 2011 required to be achieved by Electric Distribution Companies.No definition available.false0Under Act 129, percentage reduction in electricity consumption by 20116false 5ppl_PercentageOfReducedElectricityConsumptionRequiredByAct129By2013ppl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truetruefalse0.0300.030falsefalsefalse3falsefalsefalse00falsefalsefalsenum:percentItemTypepureUnder Act 129, percentage reduction in electricity consumption by 2013 required to be achieved by Electric Distribution Companies.No definition available.false0Under Act 129, percentage reduction in electricity consumption by 20137false 5ppl_PercentageOfReducedPeakDemandRequiredByAct129By2013ppl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truetruefalse0.0450.045falsefalsefalse3falsefalsefalse00falsefalsefalsenum:percentItemTypepureUnder Act 129, percentage reduction in peak demand electricity consumption by 2013 required to be achieved by Electric Distribution Companies.No definition available.false0Under Act 129, percentage reduction in peak demand electricity consumption by 20138false 5ppl_NumberOfHoursThatAreBenchmarkForDemandReductionsppl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse100100falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:integerItemTypeintegerUnder a state regulatory program related to energy efficiency and conservation plan the benchmarked number of hours, that represent the highest demand hours, that must be reduced by a specific percentage by a certain 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percentage reduction in electricity target for the company under the Phase II program11false 5ppl_MinimumDurationOfLongTermProcurementContractsppl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse44falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:integerItemTypeintegerMinimum term of long-term contracts for PLR supply allowed under Act 129.No definition available.false256Minimum term of long term supply contract under Act 129 (in years)12false 5ppl_MaximumDurationOfLongTermProcurementContractsppl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse2020falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:integerItemTypeintegerMaximum term of long-term contracts for PLR supply allowed under Act 129.No definition available.false256Maximum term of long term supply contract under Act 129 (in years)13false 5ppl_MaximumPercentageOfLongTermContractsForElectricGenerationSupplyServiceppl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truetruefalse0.250.25falsefalsefalse3falsefalsefalse00falsefalsefalsenum:percentItemTypepureThe maximum percentage of PLR supply that long-term electric generation supply contracts are limited to under Act 129.No definition available.false0Maximum percentage of long-term contracts that can be included in the mix of PLR supply contracts under Act 12914true 4ppl_RegulatoryMattersPennsylvaniaActivitiesSmartMeterRiderNumericAbstractppl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Regulatory Matters - Pennsylvania Activities - Smart Meter Rider (Numeric) [Abstract]15false 5ppl_MaximumDepreciableLifeForNewSmartMeterTechnologyInNewConstructionppl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse1515falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:integerItemTypeintegerMaximum number of years the cost of new smart meters installed in compliance with ACT 129 can be depreciated.No definition available.false256Maximum number of years the cost of smart meters can be depreciated16true 4ppl_RegulatoryMattersPennsylvaniaActivitiesPublicUtilityCommissionInvestigationOfRetailElectricityMarketNumericAbstractppl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Regulatory Matters - Pennsylvania Activities - Public Utility Commission Investigation of Retail Electricity Market (Numeric) [Abstract]17false 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5ppl_RatemakingMechanismsAuthorizedForApprovalppl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse22falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:integerItemTypeintegerThe number of specific alternative ratemaking mechanisms authorized by state legislation for approval by a state regulatory authority to provide more timely recovery of a utility's costs.No definition available.false256Number of ratemaking mechanisms authorized for PUC approval20false 5ppl_RegulatoryMattersLongTermInfrastructureImprovementPlanMinimumTermppl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse55falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:integerItemTypeintegerThe minimum term, in years, Act 11 requires utilities to file a Long Term Infrastructure Improvement Plan as a prerequisite to filing for recovery through the distribution system improvement charge.No definition available.false256Minimum term for Long Term Infrastructure Improvement Plan (in years)21false 5ppl_RegulatoryMattersLongTermInfrastructureImprovementPlanMaximumTermppl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse1010falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:integerItemTypeintegerThe maximum term, in years, Act 11 requires utilities to file a Long Term Infrastructure Improvement Plan as a prerequisite to filing for recovery through the distribution system improvement charge.No definition available.false256Maximum term for Long Term Infrastructure Improvement Plan (in years)22false 5ppl_RegulatoryMattersNumberOfIssuesAssignedToOfficeOfAdministrativeLawJudgeppl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse44falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:integerItemTypeintegerThe number of issues assigned to the administrative law judge by the Pennsylvania Public Utility Commission for hearing and preparation of a recommended decision.No definition available.false256Number of issues assigned to the Office of Administrative Law Judge23true 4ppl_RegulatoryMattersFederalMattersFederalEnergyRegulatoryCommissionFormulaRatesNumericAbstractppl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Regulatory Matters - Federal Matters - Federal Energy Regulatory Commission Formula Rates (Numeric) [Abstract]24false 5ppl_FederalEnergyRegulatoryCommissionFormulaRevenueRequirementImpactMinimumppl_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse00USD$falsetruefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe minimum pre-tax amount revenue may be negatively impacted if one or more 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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Reduction in liability for line loss liability, beginning April 2013, resulting refunds included in tariff32false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4false USDtruefalse$FROM_Jan01_2013_TO_Jun30_2013_ppl_ByCompanyAxis_PplElectricUtilitiesCorporationMember_ppl_RatesTypeAxis_DistributionRatesMemberhttp://www.sec.gov/CIK0000922224duration2013-01-01T00:00:002013-06-30T00:00:00falsefalsePPL Electric [Member]ppl_ByCompanyAxisxbrldihttp://xbrl.org/2006/xbrldippl_PplElectricUtilitiesCorporationMemberppl_ByCompanyAxisexplicitMemberfalsefalseDistribution Rates 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[Member]ppl_ByCompanyAxisxbrldihttp://xbrl.org/2006/xbrldippl_LouisvilleGasAndElectricCompanyMemberppl_ByCompanyAxisexplicitMemberfalsefalseElectric Rates [Member]ppl_RatesTypeAxisxbrldihttp://xbrl.org/2006/xbrldippl_ElectricRatesMemberppl_RatesTypeAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0LGE [Member] | Electric Rates [Member]37true 4ppl_RegulatoryMattersRateCaseProceedingNumericAbstractppl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Regulatory Matters - Rate Case Proceeding (Numeric) [Abstract]38false 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4ppl_RegulatoryMattersRateCaseProceedingNumericAbstractppl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Regulatory Matters - Rate Case Proceeding (Numeric) [Abstract]42false 5ppl_RegulatoryMattersApprovedDollarIncreaseDecreaseRatesppl_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse1500000015000000USD$falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryDollar amount of increase (decrease) to rates, approved by the applicable regulatory agency.No definition available.false2Dollar amount of increase to rates43false 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available.false2Dollar amount of increase to rates47false 5ppl_RegulatoryMattersApprovedReturnOnEquityPercentppl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truetruefalse0.10250.1025falsefalsefalse3falsefalsefalse00falsefalsefalsenum:percentItemTypepureReturn on equity authorized as part of rate case approved by the applicable regulatory agency.No definition available.false0Return on equity used in approved rate case proceeding48false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse8false USDtruefalse$FROM_Jan01_2013_TO_Jun30_2013_dei_LegalEntityAxis_PplElectricUtilitiesCorpMemberhttp://www.sec.gov/CIK0000922224duration2013-01-01T00:00:002013-06-30T00:00:00falsefalsePPL Electric Utilities Corp 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Matters - Federal Matters - Federal Energy Regulatory Commission Formula Rates (Numeric) [Abstract]72false 5ppl_FederalEnergyRegulatoryCommissionFormulaRevenueRequirementImpactMinimumppl_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse00USD$falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe minimum pre-tax amount revenue may be negatively impacted if one or more Federal Energy Regulatory Commission Form No. 1 filings have to be re-issued and the revenue requirement under the formula rate recalculated.No definition available.false2Minimum pre-tax amount revenue could be negatively impacted by a formula rate recalculation73false 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