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Summary of Significant Accounting Policies (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Integer
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Summary of Significant Accounting Policies [Line Items]        
Period of lag in reporting results for WPD (in months) 1ppl_ForeignOperationsReportingLag      
Accumulated Other Comprehensive Income (Loss) [Abstract]        
Total Accumulated Other Comprehensive Loss, Net of Tax $ (2,274,000,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (1,565,000,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (1,940,000,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (788,000,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Utility Revenue (Details) [Abstract]        
Domestic electric and gas revenue 5,209,000,000ppl_ElectricAndGasDomesticRegulatedRevenue [1] 4,842,000,000ppl_ElectricAndGasDomesticRegulatedRevenue [1] 4,519,000,000ppl_ElectricAndGasDomesticRegulatedRevenue [1]  
U.K. electric revenue 2,573,000,000ppl_ElectricForeignRegulatedRevenue [2] 2,359,000,000ppl_ElectricForeignRegulatedRevenue [2] 2,289,000,000ppl_ElectricForeignRegulatedRevenue [2]  
Total 7,782,000,000us-gaap_UtilityRevenue 7,201,000,000us-gaap_UtilityRevenue 6,808,000,000us-gaap_UtilityRevenue  
Revenue Recognition (Numeric) [Abstract]        
Costs in excess of billings on uncompleted contracts or programs 20,000,000us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms 14,000,000us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms    
Billings in excess of cost 41,000,000us-gaap_BillingsInExcessOfCost 75,000,000us-gaap_BillingsInExcessOfCost    
Cash (Numeric) [Abstract]        
Maximum maturity period for highly liquid debt instruments to be considered cash equivalents (in months) 3ppl_MaturityPeriodAtTimeOfPurchaseForInstrumentsToBeConsideredCashEquivalents      
Restricted Cash and Cash Equivalents (Numeric) [Abstract]        
Restricted cash and cash equivalents 224,000,000us-gaap_RestrictedCashAndCashEquivalents 134,000,000us-gaap_RestrictedCashAndCashEquivalents    
Property, Plant and Equipment (Numeric) [Abstract]        
Interest costs, capitalized during the period 34,000,000us-gaap_InterestCostsCapitalized 46,000,000us-gaap_InterestCostsCapitalized 53,000,000us-gaap_InterestCostsCapitalized  
Depreciation (Details) [Abstract]        
Reduction in depreciation expense in 2013 as a result of lower weighted-average rates 22,000,000ppl_DepreciationReductionInFuturePeriod 22,000,000ppl_DepreciationReductionInFuturePeriod    
Defined Benefits [Abstract]        
Difference between the actual value of plan assets and the expected value 20.00%ppl_DefinedBenefitsDifferenceBetweenActualValueAndExpectedPlanValuePercentage      
The expected average remaining service of active plan participants 50.00%ppl_DefinedBenefitsExpectedAverageRemainingServiceOfPlanParticipantsPercentage      
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis 10.00%ppl_MinimumPercentageOfPensionGainsLossesToUseAcceleratedAmortization      
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis 30.00%ppl_MaximumPercentageOfPensionGainsLossesToUseAcceleratedAmortization      
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization 30.00%ppl_ExcessPercentageOfPensionGainsLossesToUseAcceleratedAmortization      
Income Taxes [Abstract]        
Minimum percentage to be attained of likelihood of uncertain tax position being realized 50.00%ppl_UncertainTaxPositionsSecondStepBenefitRecognizedThatExceedsPercentage      
Fuel, Materials and Supplies (Details) [Abstract]        
Fuel, materials and supplies on the Balance Sheet 836,000,000us-gaap_PublicUtilitiesInventory 702,000,000us-gaap_PublicUtilitiesInventory    
Fuel [Member]        
Fuel, Materials and Supplies (Details) [Abstract]        
Fuel, materials and supplies on the Balance Sheet 408,000,000us-gaap_PublicUtilitiesInventory
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventoryFuelMember		 305,000,000us-gaap_PublicUtilitiesInventory
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventoryFuelMember		    
Natural Gas Stored Underground [Member]        
Fuel, Materials and Supplies (Details) [Abstract]        
Fuel, materials and supplies on the Balance Sheet 62,000,000us-gaap_PublicUtilitiesInventory
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventoryNaturalGasMember		 [3] 49,000,000us-gaap_PublicUtilitiesInventory
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventoryNaturalGasMember		 [3]    
Material And Supplies [Member]        
Fuel, Materials and Supplies (Details) [Abstract]        
Fuel, materials and supplies on the Balance Sheet 366,000,000us-gaap_PublicUtilitiesInventory
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventorySuppliesMember		 348,000,000us-gaap_PublicUtilitiesInventory
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventorySuppliesMember		    
Regulated Utility Plant [Member]        
Depreciation (Details) [Abstract]        
Weighted-average rates 2.92%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationTransmissionAndDistributionEquipmentMember		 2.94%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationTransmissionAndDistributionEquipmentMember		    
Nonregulated Property Plant And Equipment Generation [Member]        
Depreciation (Details) [Abstract]        
Weighted-average rates 3.28%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember		 3.10%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember		    
Nonregulated Property Plant And Equipment Generation [Member] | Brunner Island And Montour Plants [Member]        
Asset Impairment (Excluding Investments) (Numeric) [Abstract]        
Carrying value of utility plants 2,600,000,000ppl_CarryingValuePlant
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
/ us-gaap_PublicUtilityAxis
= ppl_BrunnerIslandAndMontourPlantsMember		      
Nonregulated Property Plant And Equipment Generation [Member] | Brunner Island Plant [Member]        
Asset Impairment (Excluding Investments) (Numeric) [Abstract]        
Carrying value of utility plants 1,400,000,000ppl_CarryingValuePlant
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
/ us-gaap_PublicUtilityAxis
= ppl_BrunnerIslandPlantMember		      
Nonregulated Property Plant And Equipment Generation [Member] | Montour Plant [Member]        
Asset Impairment (Excluding Investments) (Numeric) [Abstract]        
Carrying value of utility plants 1,200,000,000ppl_CarryingValuePlant
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
/ us-gaap_PublicUtilityAxis
= ppl_MontourPlantMember		      
Margin Deposits Posted To Counterparties [Member]        
Restricted Cash and Cash Equivalents (Numeric) [Abstract]        
Restricted cash and cash equivalents 175,000,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= ppl_MarginDepositsPostedToCounterpartiesMember		 67,000,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= ppl_MarginDepositsPostedToCounterpartiesMember		    
Low Carbon Network Fund [Member]        
Restricted Cash and Cash Equivalents (Numeric) [Abstract]        
Restricted cash and cash equivalents 19,000,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= ppl_LowCarbonNetworkFundMember		 [4] 27,000,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= ppl_LowCarbonNetworkFundMember		 [4]    
Funds Deposited With Trustee [Member]        
Restricted Cash and Cash Equivalents (Numeric) [Abstract]        
Restricted cash and cash equivalents   12,000,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= ppl_FundsDepositedWithTrusteeMember		    
Ironwood Debt Service Reserves [Member]        
Restricted Cash and Cash Equivalents (Numeric) [Abstract]        
Restricted cash and cash equivalents 17,000,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= ppl_IronwoodDebtServiceReservesMember		 17,000,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= ppl_IronwoodDebtServiceReservesMember		    
Other Restricted Cash [Member]        
Restricted Cash and Cash Equivalents (Numeric) [Abstract]        
Restricted cash and cash equivalents 13,000,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= ppl_OtherRestrictedCashMember		 11,000,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= ppl_OtherRestrictedCashMember		    
Allowance For Doubtful Accounts [Member]        
Allowance for Doubtful Accounts (Details) [Roll Forward]        
Balance at beginning of period 64,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 64,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 54,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		  
Additions charged to income 49,000,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 39,000,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 55,000,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [5]  
Additions charged to other accounts 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 4,000,000us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [6] 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		  
Deductions 67,000,000us-gaap_ValuationAllowancesAndReservesDeductions
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [7] 43,000,000us-gaap_ValuationAllowancesAndReservesDeductions
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [7] 45,000,000us-gaap_ValuationAllowancesAndReservesDeductions
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [7]  
Balance at end of period 46,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 64,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 64,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		  
Energy Related Businesses Adjustment 2014 [Member]        
Revenue Recognition (Numeric) [Abstract]        
Out of period adjustment amount, pre-tax 17,000,000us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount
/ us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsByNatureOfErrorAxis
= ppl_EnergyRelatedBusinessesAdjustment2014Member		      
Out of period adjustment amount, after-tax 10,000,000ppl_QuantifyingMisstatementInCurrentYearFinancialStatementsAmountAfterTax
/ us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsByNatureOfErrorAxis
= ppl_EnergyRelatedBusinessesAdjustment2014Member		      
Unaffiliated Third Party Entity [Member]        
Accounts Receivable (Numeric) [Abstract]        
Purchases of accounts receivable 1,100,000,000ppl_PurchasesOfAccountsReceivable
/ us-gaap_CounterpartyNameAxis
= ppl_UnaffiliatedThirdPartyEntityMember		 985,000,000ppl_PurchasesOfAccountsReceivable
/ us-gaap_CounterpartyNameAxis
= ppl_UnaffiliatedThirdPartyEntityMember		 848,000,000ppl_PurchasesOfAccountsReceivable
/ us-gaap_CounterpartyNameAxis
= ppl_UnaffiliatedThirdPartyEntityMember		  
KU [Member] | Electric Energy Inc [Member]        
Equity Method Investment [Abstract]        
Ownership percentage 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ ppl_ByCompanyAxis
= ppl_KentuckyUtilitiesCompanyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ppl_ElectricEnergyIncMember		      
Income (loss) from investment     8,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ ppl_ByCompanyAxis
= ppl_KentuckyUtilitiesCompanyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ppl_ElectricEnergyIncMember		  
Impairment charge     25,000,000us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
/ ppl_ByCompanyAxis
= ppl_KentuckyUtilitiesCompanyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ppl_ElectricEnergyIncMember		  
Impairment charge, after-tax     15,000,000ppl_EquityMethodInvestmentOtherThanTemporaryImpairmentAfterTax
/ ppl_ByCompanyAxis
= ppl_KentuckyUtilitiesCompanyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ppl_ElectricEnergyIncMember		  
PPL Energy Supply LLC [Member]        
Accumulated Other Comprehensive Income (Loss) [Abstract]        
Total Accumulated Other Comprehensive Loss, Net of Tax (23,000,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		 77,000,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		 48,000,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		 487,000,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
Revenue Recognition (Numeric) [Abstract]        
Costs in excess of billings on uncompleted contracts or programs 20,000,000us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		 14,000,000us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		    
Billings in excess of cost 41,000,000us-gaap_BillingsInExcessOfCost
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		 75,000,000us-gaap_BillingsInExcessOfCost
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		    
Cash (Numeric) [Abstract]        
Maximum maturity period for highly liquid debt instruments to be considered cash equivalents (in months) 3ppl_MaturityPeriodAtTimeOfPurchaseForInstrumentsToBeConsideredCashEquivalents
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		      
Restricted Cash and Cash Equivalents (Numeric) [Abstract]        
Restricted cash and cash equivalents 193,000,000us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		 85,000,000us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		    
Property, Plant and Equipment (Numeric) [Abstract]        
Interest costs, capitalized during the period 23,000,000us-gaap_InterestCostsCapitalized
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		 37,000,000us-gaap_InterestCostsCapitalized
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		 47,000,000us-gaap_InterestCostsCapitalized
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		  
Defined Benefits [Abstract]        
Difference between the actual value of plan assets and the expected value 20.00%ppl_DefinedBenefitsDifferenceBetweenActualValueAndExpectedPlanValuePercentage
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		      
The expected average remaining service of active plan participants 50.00%ppl_DefinedBenefitsExpectedAverageRemainingServiceOfPlanParticipantsPercentage
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		      
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis 10.00%ppl_MinimumPercentageOfPensionGainsLossesToUseAcceleratedAmortization
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		      
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis 30.00%ppl_MaximumPercentageOfPensionGainsLossesToUseAcceleratedAmortization
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		      
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization 30.00%ppl_ExcessPercentageOfPensionGainsLossesToUseAcceleratedAmortization
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		      
Income Taxes [Abstract]        
Minimum percentage to be attained of likelihood of uncertain tax position being realized 50.00%ppl_UncertainTaxPositionsSecondStepBenefitRecognizedThatExceedsPercentage
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		      
Intercompany tax receivables (payables) 105,000,000ppl_IntercompanyTaxReceivablesPayables
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		 44,000,000ppl_IntercompanyTaxReceivablesPayables
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		    
Fuel, Materials and Supplies (Details) [Abstract]        
Fuel, materials and supplies on the Balance Sheet 455,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		 358,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		    
PPL Energy Supply LLC [Member] | Fuel [Member]        
Fuel, Materials and Supplies (Details) [Abstract]        
Fuel, materials and supplies on the Balance Sheet 243,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventoryFuelMember		 163,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventoryFuelMember		    
PPL Energy Supply LLC [Member] | Natural Gas Stored Underground [Member]        
Fuel, Materials and Supplies (Details) [Abstract]        
Fuel, materials and supplies on the Balance Sheet 7,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventoryNaturalGasMember		 [3] 2,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventoryNaturalGasMember		 [3]    
PPL Energy Supply LLC [Member] | Material And Supplies [Member]        
Fuel, Materials and Supplies (Details) [Abstract]        
Fuel, materials and supplies on the Balance Sheet 205,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventorySuppliesMember		 193,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventorySuppliesMember		    
PPL Energy Supply LLC [Member] | Nonregulated Property Plant And Equipment Generation [Member]        
Depreciation (Details) [Abstract]        
Weighted-average rates 3.28%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember		 3.10%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember		    
PPL Energy Supply LLC [Member] | Nonregulated Property Plant And Equipment Generation [Member] | Brunner Island And Montour Plants [Member]        
Asset Impairment (Excluding Investments) (Numeric) [Abstract]        
Carrying value of utility plants 2,600,000,000ppl_CarryingValuePlant
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
/ us-gaap_PublicUtilityAxis
= ppl_BrunnerIslandAndMontourPlantsMember		      
PPL Energy Supply LLC [Member] | Nonregulated Property Plant And Equipment Generation [Member] | Brunner Island Plant [Member]        
Asset Impairment (Excluding Investments) (Numeric) [Abstract]        
Carrying value of utility plants 1,400,000,000ppl_CarryingValuePlant
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
/ us-gaap_PublicUtilityAxis
= ppl_BrunnerIslandPlantMember		      
PPL Energy Supply LLC [Member] | Nonregulated Property Plant And Equipment Generation [Member] | Montour Plant [Member]        
Asset Impairment (Excluding Investments) (Numeric) [Abstract]        
Carrying value of utility plants 1,200,000,000ppl_CarryingValuePlant
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
/ us-gaap_PublicUtilityAxis
= ppl_MontourPlantMember		      
PPL Energy Supply LLC [Member] | Margin Deposits Posted To Counterparties [Member]        
Restricted Cash and Cash Equivalents (Numeric) [Abstract]        
Restricted cash and cash equivalents 175,000,000us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= ppl_MarginDepositsPostedToCounterpartiesMember		 67,000,000us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= ppl_MarginDepositsPostedToCounterpartiesMember		    
PPL Energy Supply LLC [Member] | Ironwood Debt Service Reserves [Member]        
Restricted Cash and Cash Equivalents (Numeric) [Abstract]        
Restricted cash and cash equivalents 17,000,000us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= ppl_IronwoodDebtServiceReservesMember		 17,000,000us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= ppl_IronwoodDebtServiceReservesMember		    
PPL Energy Supply LLC [Member] | Other Restricted Cash [Member]        
Restricted Cash and Cash Equivalents (Numeric) [Abstract]        
Restricted cash and cash equivalents 1,000,000us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= ppl_OtherRestrictedCashMember		 1,000,000us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= ppl_OtherRestrictedCashMember		    
PPL Energy Supply LLC [Member] | Allowance For Doubtful Accounts [Member]        
Allowance for Doubtful Accounts (Details) [Roll Forward]        
Balance at beginning of period 21,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 23,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 15,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		  
Additions charged to income 0us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 1,000,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 12,000,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [5]  
Additions charged to other accounts 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		  
Deductions 19,000,000us-gaap_ValuationAllowancesAndReservesDeductions
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [5],[7] 3,000,000us-gaap_ValuationAllowancesAndReservesDeductions
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [7] 4,000,000us-gaap_ValuationAllowancesAndReservesDeductions
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [7]  
Balance at end of period 2,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 21,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 23,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		  
PPL Energy Supply LLC [Member] | Energy Related Businesses Adjustment 2014 [Member]        
Revenue Recognition (Numeric) [Abstract]        
Out of period adjustment amount, pre-tax 17,000,000us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsByNatureOfErrorAxis
= ppl_EnergyRelatedBusinessesAdjustment2014Member		      
Out of period adjustment amount, after-tax 10,000,000ppl_QuantifyingMisstatementInCurrentYearFinancialStatementsAmountAfterTax
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsByNatureOfErrorAxis
= ppl_EnergyRelatedBusinessesAdjustment2014Member		      
PPL Electric Utilities Corp [Member]        
Cash (Numeric) [Abstract]        
Maximum maturity period for highly liquid debt instruments to be considered cash equivalents (in months) 3ppl_MaturityPeriodAtTimeOfPurchaseForInstrumentsToBeConsideredCashEquivalents
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember		      
Restricted Cash and Cash Equivalents (Numeric) [Abstract]        
Restricted cash and cash equivalents 3,000,000us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember		 12,000,000us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember		    
Defined Benefits [Abstract]        
Difference between the actual value of plan assets and the expected value 20.00%ppl_DefinedBenefitsDifferenceBetweenActualValueAndExpectedPlanValuePercentage
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember		      
The expected average remaining service of active plan participants 50.00%ppl_DefinedBenefitsExpectedAverageRemainingServiceOfPlanParticipantsPercentage
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember		      
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis 10.00%ppl_MinimumPercentageOfPensionGainsLossesToUseAcceleratedAmortization
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember		      
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis 30.00%ppl_MaximumPercentageOfPensionGainsLossesToUseAcceleratedAmortization
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember		      
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization 30.00%ppl_ExcessPercentageOfPensionGainsLossesToUseAcceleratedAmortization
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember		      
Income Taxes [Abstract]        
Minimum percentage to be attained of likelihood of uncertain tax position being realized 50.00%ppl_UncertainTaxPositionsSecondStepBenefitRecognizedThatExceedsPercentage
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember		      
Intercompany tax receivables (payables) (25,000,000)ppl_IntercompanyTaxReceivablesPayables
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember		 (19,000,000)ppl_IntercompanyTaxReceivablesPayables
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember		    
PPL Electric Utilities Corp [Member] | Regulated Utility Plant [Member]        
Depreciation (Details) [Abstract]        
Weighted-average rates 2.46%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationTransmissionAndDistributionEquipmentMember		 2.61%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationTransmissionAndDistributionEquipmentMember		    
PPL Electric Utilities Corp [Member] | Funds Deposited With Trustee [Member]        
Restricted Cash and Cash Equivalents (Numeric) [Abstract]        
Restricted cash and cash equivalents   12,000,000us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= ppl_FundsDepositedWithTrusteeMember		    
PPL Electric Utilities Corp [Member] | Other Restricted Cash [Member]        
Restricted Cash and Cash Equivalents (Numeric) [Abstract]        
Restricted cash and cash equivalents 3,000,000us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= ppl_OtherRestrictedCashMember		      
PPL Electric Utilities Corp [Member] | Allowance For Doubtful Accounts [Member]        
Allowance for Doubtful Accounts (Details) [Roll Forward]        
Balance at beginning of period 18,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 18,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 17,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		  
Additions charged to income 34,000,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 32,000,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 32,000,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		  
Additions charged to other accounts 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		  
Deductions 35,000,000us-gaap_ValuationAllowancesAndReservesDeductions
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [7] 32,000,000us-gaap_ValuationAllowancesAndReservesDeductions
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [7] 31,000,000us-gaap_ValuationAllowancesAndReservesDeductions
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [7]  
Balance at end of period 17,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 18,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 18,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		  
PPL Electric Utilities Corp [Member] | Unaffiliated Third Party Entity [Member]        
Accounts Receivable (Numeric) [Abstract]        
Purchases of accounts receivable 1,100,000,000ppl_PurchasesOfAccountsReceivable
/ us-gaap_CounterpartyNameAxis
= ppl_UnaffiliatedThirdPartyEntityMember
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember		 985,000,000ppl_PurchasesOfAccountsReceivable
/ us-gaap_CounterpartyNameAxis
= ppl_UnaffiliatedThirdPartyEntityMember
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember		 848,000,000ppl_PurchasesOfAccountsReceivable
/ us-gaap_CounterpartyNameAxis
= ppl_UnaffiliatedThirdPartyEntityMember
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember		  
LG And E And KU Energy LLC [Member]        
Accumulated Other Comprehensive Income (Loss) [Abstract]        
Total Accumulated Other Comprehensive Loss, Net of Tax (45,000,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember		 13,000,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember		 (15,000,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember		 4,000,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
Cash (Numeric) [Abstract]        
Maximum maturity period for highly liquid debt instruments to be considered cash equivalents (in months) 3ppl_MaturityPeriodAtTimeOfPurchaseForInstrumentsToBeConsideredCashEquivalents
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember		      
Depreciation (Details) [Abstract]        
Reduction in depreciation expense in 2013 as a result of lower weighted-average rates 22,000,000ppl_DepreciationReductionInFuturePeriod
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember		 22,000,000ppl_DepreciationReductionInFuturePeriod
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember		    
Defined Benefits [Abstract]        
Difference between the actual value of plan assets and the expected value 20.00%ppl_DefinedBenefitsDifferenceBetweenActualValueAndExpectedPlanValuePercentage
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember		      
The expected average remaining service of active plan participants 50.00%ppl_DefinedBenefitsExpectedAverageRemainingServiceOfPlanParticipantsPercentage
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember		      
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis 10.00%ppl_MinimumPercentageOfPensionGainsLossesToUseAcceleratedAmortization
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember		      
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis 30.00%ppl_MaximumPercentageOfPensionGainsLossesToUseAcceleratedAmortization
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember		      
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization 30.00%ppl_ExcessPercentageOfPensionGainsLossesToUseAcceleratedAmortization
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember		      
Income Taxes [Abstract]        
Minimum percentage to be attained of likelihood of uncertain tax position being realized 50.00%ppl_UncertainTaxPositionsSecondStepBenefitRecognizedThatExceedsPercentage
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember		      
Intercompany tax receivables (payables) 136,000,000ppl_IntercompanyTaxReceivablesPayables
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember		 (28,000,000)ppl_IntercompanyTaxReceivablesPayables
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember		    
Fuel, Materials and Supplies (Details) [Abstract]        
Fuel, materials and supplies on the Balance Sheet 311,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember		 278,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember		    
LG And E And KU Energy LLC [Member] | Ohio Valley Electric Corporation [Member]        
Cost Method Investments [Abstract]        
Number of electric utilities that are equity owners 10ppl_CostMethodInvestmentElectricUtilitiesEquityOwners
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ppl_OhioValleyElectricCorporationMember		      
Number of companies power is supplied to 11ppl_CostMethodInvestmentCompaniesSuppliedPower
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ppl_OhioValleyElectricCorporationMember		      
LG And E And KU Energy LLC [Member] | Fuel [Member]        
Fuel, Materials and Supplies (Details) [Abstract]        
Fuel, materials and supplies on the Balance Sheet 166,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventoryFuelMember		 141,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventoryFuelMember		    
LG And E And KU Energy LLC [Member] | Natural Gas Stored Underground [Member]        
Fuel, Materials and Supplies (Details) [Abstract]        
Fuel, materials and supplies on the Balance Sheet 54,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventoryNaturalGasMember		 [3] 48,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventoryNaturalGasMember		 [3]    
LG And E And KU Energy LLC [Member] | Material And Supplies [Member]        
Fuel, Materials and Supplies (Details) [Abstract]        
Fuel, materials and supplies on the Balance Sheet 91,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventorySuppliesMember		 89,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventorySuppliesMember		    
LG And E And KU Energy LLC [Member] | Regulated Utility Plant [Member]        
Depreciation (Details) [Abstract]        
Weighted-average rates 3.80%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationTransmissionAndDistributionEquipmentMember		 4.07%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationTransmissionAndDistributionEquipmentMember		    
LG And E And KU Energy LLC [Member] | Allowance For Doubtful Accounts [Member]        
Allowance for Doubtful Accounts (Details) [Roll Forward]        
Balance at beginning of period 22,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 19,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 17,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		  
Additions charged to income 14,000,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 4,000,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 9,000,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		  
Additions charged to other accounts 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 4,000,000us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [6] 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		  
Deductions 11,000,000us-gaap_ValuationAllowancesAndReservesDeductions
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [7] 5,000,000us-gaap_ValuationAllowancesAndReservesDeductions
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [7] 7,000,000us-gaap_ValuationAllowancesAndReservesDeductions
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [7]  
Balance at end of period 25,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 22,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 19,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		  
LG And E And KU Energy LLC [Member] | LGE [Member] | Ohio Valley Electric Corporation [Member]        
Cost Method Investments [Abstract]        
Ownership percentage 5.63%ppl_CostMethodInvestmentOwnershipPercentage
/ ppl_ByCompanyAxis
= ppl_LouisvilleGasAndElectricCompanyMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ppl_OhioValleyElectricCorporationMember		      
Generation capacity in terms of ownership percentage (in MW) 120ppl_CostMethodInvestmentGenerationCapacity
/ ppl_ByCompanyAxis
= ppl_LouisvilleGasAndElectricCompanyMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ppl_OhioValleyElectricCorporationMember		      
LG And E And KU Energy LLC [Member] | KU [Member] | Ohio Valley Electric Corporation [Member]        
Cost Method Investments [Abstract]        
Ownership percentage 2.50%ppl_CostMethodInvestmentOwnershipPercentage
/ ppl_ByCompanyAxis
= ppl_KentuckyUtilitiesCompanyMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ppl_OhioValleyElectricCorporationMember		      
Generation capacity in terms of ownership percentage (in MW) 53ppl_CostMethodInvestmentGenerationCapacity
/ ppl_ByCompanyAxis
= ppl_KentuckyUtilitiesCompanyMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ppl_OhioValleyElectricCorporationMember		      
LG And E And KU Energy LLC [Member] | KU [Member] | Electric Energy Inc [Member]        
Equity Method Investment [Abstract]        
Ownership percentage 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ ppl_ByCompanyAxis
= ppl_KentuckyUtilitiesCompanyMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ppl_ElectricEnergyIncMember		      
Income (loss) from investment     8,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ ppl_ByCompanyAxis
= ppl_KentuckyUtilitiesCompanyMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ppl_ElectricEnergyIncMember		  
Impairment charge     25,000,000us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
/ ppl_ByCompanyAxis
= ppl_KentuckyUtilitiesCompanyMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ppl_ElectricEnergyIncMember		  
Impairment charge, after-tax     15,000,000ppl_EquityMethodInvestmentOtherThanTemporaryImpairmentAfterTax
/ ppl_ByCompanyAxis
= ppl_KentuckyUtilitiesCompanyMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ppl_ElectricEnergyIncMember		  
Louisville Gas And Electric Co [Member]        
Utility Revenue (Details) [Abstract]        
Total 1,445,000,000us-gaap_UtilityRevenue
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember		 1,351,000,000us-gaap_UtilityRevenue
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember		 1,247,000,000us-gaap_UtilityRevenue
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember		  
Cash (Numeric) [Abstract]        
Maximum maturity period for highly liquid debt instruments to be considered cash equivalents (in months) 3ppl_MaturityPeriodAtTimeOfPurchaseForInstrumentsToBeConsideredCashEquivalents
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember		      
Depreciation (Details) [Abstract]        
Reduction in depreciation expense in 2013 as a result of lower weighted-average rates 8,000,000ppl_DepreciationReductionInFuturePeriod
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember		 8,000,000ppl_DepreciationReductionInFuturePeriod
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember		    
Defined Benefits [Abstract]        
Difference between the actual value of plan assets and the expected value 20.00%ppl_DefinedBenefitsDifferenceBetweenActualValueAndExpectedPlanValuePercentage
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember		      
The expected average remaining service of active plan participants 50.00%ppl_DefinedBenefitsExpectedAverageRemainingServiceOfPlanParticipantsPercentage
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember		      
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis 10.00%ppl_MinimumPercentageOfPensionGainsLossesToUseAcceleratedAmortization
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember		      
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis 30.00%ppl_MaximumPercentageOfPensionGainsLossesToUseAcceleratedAmortization
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember		      
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization 30.00%ppl_ExcessPercentageOfPensionGainsLossesToUseAcceleratedAmortization
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember		      
Income Taxes [Abstract]        
Minimum percentage to be attained of likelihood of uncertain tax position being realized 50.00%ppl_UncertainTaxPositionsSecondStepBenefitRecognizedThatExceedsPercentage
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember		      
Intercompany tax receivables (payables) 74,000,000ppl_IntercompanyTaxReceivablesPayables
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember		 (8,000,000)ppl_IntercompanyTaxReceivablesPayables
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember		    
Fuel, Materials and Supplies (Details) [Abstract]        
Fuel, materials and supplies on the Balance Sheet 162,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember		 154,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember		    
Louisville Gas And Electric Co [Member] | Ohio Valley Electric Corporation [Member]        
Cost Method Investments [Abstract]        
Number of electric utilities that are equity owners 10ppl_CostMethodInvestmentElectricUtilitiesEquityOwners
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ppl_OhioValleyElectricCorporationMember		      
Number of companies power is supplied to 11ppl_CostMethodInvestmentCompaniesSuppliedPower
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ppl_OhioValleyElectricCorporationMember		      
Ownership percentage 5.63%ppl_CostMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ppl_OhioValleyElectricCorporationMember		      
Generation capacity in terms of ownership percentage (in MW) 120ppl_CostMethodInvestmentGenerationCapacity
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ppl_OhioValleyElectricCorporationMember		      
Louisville Gas And Electric Co [Member] | Fuel [Member]        
Fuel, Materials and Supplies (Details) [Abstract]        
Fuel, materials and supplies on the Balance Sheet 66,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventoryFuelMember		 64,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventoryFuelMember		    
Louisville Gas And Electric Co [Member] | Natural Gas Stored Underground [Member]        
Fuel, Materials and Supplies (Details) [Abstract]        
Fuel, materials and supplies on the Balance Sheet 54,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventoryNaturalGasMember		 [3] 48,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventoryNaturalGasMember		 [3]    
Louisville Gas And Electric Co [Member] | Material And Supplies [Member]        
Fuel, Materials and Supplies (Details) [Abstract]        
Fuel, materials and supplies on the Balance Sheet 42,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventorySuppliesMember		 42,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventorySuppliesMember		    
Louisville Gas And Electric Co [Member] | Regulated Utility Plant [Member]        
Depreciation (Details) [Abstract]        
Weighted-average rates 4.05%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationTransmissionAndDistributionEquipmentMember		 4.52%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationTransmissionAndDistributionEquipmentMember		    
Louisville Gas And Electric Co [Member] | Allowance For Doubtful Accounts [Member]        
Allowance for Doubtful Accounts (Details) [Roll Forward]        
Balance at beginning of period 2,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 1,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 2,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		  
Additions charged to income 5,000,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 2,000,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 2,000,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		  
Additions charged to other accounts (1,000,000)us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [6] 1,000,000us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [6] 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		  
Deductions 4,000,000us-gaap_ValuationAllowancesAndReservesDeductions
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [7] 2,000,000us-gaap_ValuationAllowancesAndReservesDeductions
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [7] 3,000,000us-gaap_ValuationAllowancesAndReservesDeductions
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [7]  
Balance at end of period 2,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 2,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 1,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		  
Kentucky Utilities Co [Member]        
Accumulated Other Comprehensive Income (Loss) [Abstract]        
Total Accumulated Other Comprehensive Loss, Net of Tax 0us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember		 1,000,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember		    
Utility Revenue (Details) [Abstract]        
Total 1,723,000,000us-gaap_UtilityRevenue
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember		 1,625,000,000us-gaap_UtilityRevenue
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember		 1,512,000,000us-gaap_UtilityRevenue
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember		  
Cash (Numeric) [Abstract]        
Maximum maturity period for highly liquid debt instruments to be considered cash equivalents (in months) 3ppl_MaturityPeriodAtTimeOfPurchaseForInstrumentsToBeConsideredCashEquivalents
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember		      
Depreciation (Details) [Abstract]        
Reduction in depreciation expense in 2013 as a result of lower weighted-average rates 14,000,000ppl_DepreciationReductionInFuturePeriod
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember		 14,000,000ppl_DepreciationReductionInFuturePeriod
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember		    
Defined Benefits [Abstract]        
Difference between the actual value of plan assets and the expected value 20.00%ppl_DefinedBenefitsDifferenceBetweenActualValueAndExpectedPlanValuePercentage
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember		      
The expected average remaining service of active plan participants 50.00%ppl_DefinedBenefitsExpectedAverageRemainingServiceOfPlanParticipantsPercentage
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember		      
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis 10.00%ppl_MinimumPercentageOfPensionGainsLossesToUseAcceleratedAmortization
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember		      
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis 30.00%ppl_MaximumPercentageOfPensionGainsLossesToUseAcceleratedAmortization
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember		      
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization 30.00%ppl_ExcessPercentageOfPensionGainsLossesToUseAcceleratedAmortization
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember		      
Income Taxes [Abstract]        
Minimum percentage to be attained of likelihood of uncertain tax position being realized 50.00%ppl_UncertainTaxPositionsSecondStepBenefitRecognizedThatExceedsPercentage
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember		      
Intercompany tax receivables (payables) 60,000,000ppl_IntercompanyTaxReceivablesPayables
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember		 (27,000,000)ppl_IntercompanyTaxReceivablesPayables
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember		    
Fuel, Materials and Supplies (Details) [Abstract]        
Fuel, materials and supplies on the Balance Sheet 149,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember		 124,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember		    
Kentucky Utilities Co [Member] | Ohio Valley Electric Corporation [Member]        
Cost Method Investments [Abstract]        
Number of electric utilities that are equity owners 10ppl_CostMethodInvestmentElectricUtilitiesEquityOwners
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ppl_OhioValleyElectricCorporationMember		      
Number of companies power is supplied to 11ppl_CostMethodInvestmentCompaniesSuppliedPower
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ppl_OhioValleyElectricCorporationMember		      
Ownership percentage 2.50%ppl_CostMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ppl_OhioValleyElectricCorporationMember		      
Generation capacity in terms of ownership percentage (in MW) 53ppl_CostMethodInvestmentGenerationCapacity
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ppl_OhioValleyElectricCorporationMember		      
Kentucky Utilities Co [Member] | Electric Energy Inc [Member]        
Equity Method Investment [Abstract]        
Ownership percentage 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ppl_ElectricEnergyIncMember		      
Income (loss) from investment     8,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ppl_ElectricEnergyIncMember		  
Impairment charge     25,000,000us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ppl_ElectricEnergyIncMember		  
Impairment charge, after-tax     15,000,000ppl_EquityMethodInvestmentOtherThanTemporaryImpairmentAfterTax
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ppl_ElectricEnergyIncMember		  
Kentucky Utilities Co [Member] | Fuel [Member]        
Fuel, Materials and Supplies (Details) [Abstract]        
Fuel, materials and supplies on the Balance Sheet 100,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventoryFuelMember		 77,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventoryFuelMember		    
Kentucky Utilities Co [Member] | Material And Supplies [Member]        
Fuel, Materials and Supplies (Details) [Abstract]        
Fuel, materials and supplies on the Balance Sheet 49,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventorySuppliesMember		 47,000,000us-gaap_PublicUtilitiesInventory
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventorySuppliesMember		    
Kentucky Utilities Co [Member] | Regulated Utility Plant [Member]        
Depreciation (Details) [Abstract]        
Weighted-average rates 3.63%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationTransmissionAndDistributionEquipmentMember		 3.77%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationTransmissionAndDistributionEquipmentMember		    
Kentucky Utilities Co [Member] | Allowance For Doubtful Accounts [Member]        
Allowance for Doubtful Accounts (Details) [Roll Forward]        
Balance at beginning of period 4,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 2,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 2,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		  
Additions charged to income 8,000,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 3,000,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 4,000,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		  
Additions charged to other accounts (3,000,000)us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [6] 3,000,000us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [6] 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		  
Deductions 7,000,000us-gaap_ValuationAllowancesAndReservesDeductions
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [7] 4,000,000us-gaap_ValuationAllowancesAndReservesDeductions
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [7] 4,000,000us-gaap_ValuationAllowancesAndReservesDeductions
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [7]  
Balance at end of period $ 2,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 $ 4,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 $ 2,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		  
[1]

Represents revenue from cost-based rate-regulated generation, transmission and/or distribution in Pennsylvania, Kentucky, Virginia and Tennessee, including regulated wholesale revenue.

[2]

Represents regulated electricity distribution revenue from the operation of WPD's distribution networks.

[3]

The majority of LKE's and LG&E's natural gas stored underground is held to serve retail customers.
[4]

Funds received by WPD, which are to be spent on approved initiatives to support a low carbon environment.

[5]

In 2011, a wholesale customer, SMGT, filed for bankruptcy protection under Chapter 11 of the U.S. Bankruptcy code. In 2012, PPL EnergyPlus recorded an additional allowance for unpaid amounts under the long-term power contract and the U.S. Bankruptcy Court for the District of Montana approved a request to terminate the contract. In 2014, PPL EnergyPlus received an insignificant amount of cash, settling the outstanding administrative claim and therefore, the related reserve balance was offset against the accounts receivable balance.

[6]

Primarily related to capital projects, thusthe provision was recorded as an adjustment to construction work in progress.
[7]

Primarily related to uncollectible accounts written off.