Fair Value Measurements and Credit Concentration (Financial Instruments Not Recorded at Fair Value and Credit Concentration) (Details) (USD $) In Millions, unless otherwise specified
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Dec. 31, 2014
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Dec. 31, 2013
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Credit Concentration Associated with Financial Instruments (Numeric) [Abstract] |
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Gross credit exposure from energy trading partners |
$ 708ppl_ConcentrationRiskCreditRiskFinInstrumentMaximumExposure |
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Net credit exposure to energy trading partners |
374ppl_FairValueConcentrationOfCreditRiskAfterMasterNettingCollateralArrangements |
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Dollar exposure to top ten energy trading counterparties |
164ppl_DollarExposureToTopTenCounterparties |
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Percentage exposure to top ten energy trading counterparties |
44.00%ppl_PercentageExposureToTopTenCounterparties |
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Number of counterparties in top ten that have investment grade credit rating |
9ppl_NumberOfCounterpartiesInTopTenWithInvestmentGradeRating |
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Percentage of top ten's exposure that consists of counterparties with investment grade credit rating (in hundreths) |
95.00%ppl_PercentageOfCounterpartiesInTopTenWithInvestmentGradeRating |
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Carrying Amount [Member] |
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
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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] |
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
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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] |
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Credit Concentration Associated with Financial Instruments (Numeric) [Abstract] |
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Gross credit exposure from energy trading partners |
708ppl_ConcentrationRiskCreditRiskFinInstrumentMaximumExposure / dei_LegalEntityAxis = ppl_PplEnergySupplyLLCMember |
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Net credit exposure to energy trading partners |
374ppl_FairValueConcentrationOfCreditRiskAfterMasterNettingCollateralArrangements / dei_LegalEntityAxis = ppl_PplEnergySupplyLLCMember |
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Dollar exposure to top ten energy trading counterparties |
164ppl_DollarExposureToTopTenCounterparties / dei_LegalEntityAxis = ppl_PplEnergySupplyLLCMember |
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Percentage exposure to top ten energy trading counterparties |
44.00%ppl_PercentageExposureToTopTenCounterparties / dei_LegalEntityAxis = ppl_PplEnergySupplyLLCMember |
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Number of counterparties in top ten that have investment grade credit rating |
9ppl_NumberOfCounterpartiesInTopTenWithInvestmentGradeRating / dei_LegalEntityAxis = ppl_PplEnergySupplyLLCMember |
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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 |
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PPL Energy Supply LLC [Member] | Carrying Amount [Member] |
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
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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] |
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
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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] |
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
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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] |
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
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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] |
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
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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] |
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
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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] |
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
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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] |
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
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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] |
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
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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] |
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
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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 |