XML 47 R71.htm IDEA: XBRL DOCUMENT v2.4.1.9
Fair Value Measurements and Credit Concentration (Financial Instruments Not Recorded at Fair Value and Credit Concentration) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Credit Concentration Associated with Financial Instruments (Numeric) [Abstract]    
Gross credit exposure from energy trading partners $ 692ppl_ConcentrationRiskCreditRiskFinInstrumentMaximumExposure  
Net credit exposure to energy trading partners 402ppl_FairValueConcentrationOfCreditRiskAfterMasterNettingCollateralArrangements  
Dollar exposure to top ten energy trading counterparties 220ppl_DollarExposureToTopTenCounterparties  
Percentage exposure to top ten energy trading counterparties 55.00%ppl_PercentageExposureToTopTenCounterparties  
Number of counterparties in top ten that have investment grade credit rating 8ppl_NumberOfCounterpartiesInTopTenWithInvestmentGradeRating  
Percentage of top ten's exposure that consists of counterparties with investment grade credit rating (in hundreths) 75.00%ppl_PercentageOfCounterpartiesInTopTenWithInvestmentGradeRating  
Carrying Amount [Member]    
Fair Value of Financial Instruments Not Recorded at Fair Value - Other    
Long-term debt 20,307us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
20,391us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fair Value [Member]    
Fair Value of Financial Instruments Not Recorded at Fair Value - Other    
Long-term debt 23,258us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
22,670us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
PPL Electric Utilities Corp [Member] | Carrying Amount [Member]    
Fair Value of Financial Instruments Not Recorded at Fair Value - Other    
Long-term debt 2,603us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
2,602us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
PPL Electric Utilities Corp [Member] | Fair Value [Member]    
Fair Value of Financial Instruments Not Recorded at Fair Value - Other    
Long-term debt 3,084us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
2,990us-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 of Financial Instruments Not Recorded at Fair Value - Other    
Long-term debt 4,567us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
4,567us-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 of Financial Instruments Not Recorded at Fair Value - Other    
Long-term debt 5,091us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
4,946us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
Louisville Gas And Electric Co [Member] | Carrying Amount [Member]    
Fair Value of Financial Instruments Not Recorded at Fair Value - Other    
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 of Financial Instruments Not Recorded at Fair Value - Other    
Long-term debt 1,493us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
1,455us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
Kentucky Utilities Co [Member] | Carrying Amount [Member]    
Fair Value of Financial Instruments Not Recorded at Fair Value - Other    
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 of Financial Instruments Not Recorded at Fair Value - Other    
Long-term debt $ 2,396us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
$ 2,313us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember