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Fair Value Measurements and Credit Concentration (Financial Instruments Not Recorded at Fair Value and Credit Concentration) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Credit Concentration Associated with Financial Instruments (Numeric) [Abstract]    
Gross credit exposure from energy trading partners $ 708ppl_ConcentrationRiskCreditRiskFinInstrumentMaximumExposure  
Net credit exposure to energy trading partners 374ppl_FairValueConcentrationOfCreditRiskAfterMasterNettingCollateralArrangements  
Dollar exposure to top ten energy trading counterparties 164ppl_DollarExposureToTopTenCounterparties  
Percentage exposure to top ten energy trading counterparties 44.00%ppl_PercentageExposureToTopTenCounterparties  
Number of counterparties in top ten that have investment grade credit rating 9ppl_NumberOfCounterpartiesInTopTenWithInvestmentGradeRating  
Percentage of top ten's exposure that consists of counterparties with investment grade credit rating (in hundreths) 95.00%ppl_PercentageOfCounterpartiesInTopTenWithInvestmentGradeRating  
Carrying Amount [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt 20,391us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
20,907us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fair Value [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt 22,670us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
22,177us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
PPL Energy Supply LLC [Member]    
Credit Concentration Associated with Financial Instruments (Numeric) [Abstract]    
Gross credit exposure from energy trading partners 708ppl_ConcentrationRiskCreditRiskFinInstrumentMaximumExposure
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
 
Net credit exposure to energy trading partners 374ppl_FairValueConcentrationOfCreditRiskAfterMasterNettingCollateralArrangements
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
 
Dollar exposure to top ten energy trading counterparties 164ppl_DollarExposureToTopTenCounterparties
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
 
Percentage exposure to top ten energy trading counterparties 44.00%ppl_PercentageExposureToTopTenCounterparties
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
 
Number of counterparties in top ten that have investment grade credit rating 9ppl_NumberOfCounterpartiesInTopTenWithInvestmentGradeRating
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
 
Percentage of top ten's exposure that consists of counterparties with investment grade credit rating (in hundreths) 95.00%ppl_PercentageOfCounterpartiesInTopTenWithInvestmentGradeRating
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
 
PPL Energy Supply LLC [Member] | Carrying Amount [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt 2,218us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
2,525us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
PPL Energy Supply LLC [Member] | Fair Value [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt 2,204us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
2,658us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
PPL Electric Utilities Corp [Member] | Carrying Amount [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt 2,602us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
2,315us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
PPL Electric Utilities Corp [Member] | Fair Value [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt 2,990us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
2,483us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
LG And E And KU Energy LLC [Member] | Carrying Amount [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt 4,567us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
4,565us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
LG And E And KU Energy LLC [Member] | Fair Value [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt 4,946us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
4,672us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
Louisville Gas And Electric Co [Member] | Carrying Amount [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt 1,353us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
1,353us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
Louisville Gas And Electric Co [Member] | Fair Value [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt 1,455us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
1,372us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
Kentucky Utilities Co [Member] | Carrying Amount [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt 2,091us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
2,091us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
Kentucky Utilities Co [Member] | Fair Value [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt $ 2,313us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
$ 2,155us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember