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Derivative Instruments and Hedging Activities (Offseting Derivative Instruments and Credit Risk-Related Features) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Offsetting Assets And Liabilities [Line Items]    
Gross assets $ 1,477us-gaap_DerivativeFairValueOfDerivativeAsset $ 1,279us-gaap_DerivativeFairValueOfDerivativeAsset
Derivative instruments eligible for offset - assets 1,125us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral 973us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
Cash collateral received eligible for offset - assets 10us-gaap_DerivativeCollateralObligationToReturnCash 7us-gaap_DerivativeCollateralObligationToReturnCash
Net assets 342us-gaap_DerivativeAssets 299us-gaap_DerivativeAssets
Gross liabilities 1,378us-gaap_DerivativeFairValueOfDerivativeLiability 1,244us-gaap_DerivativeFairValueOfDerivativeLiability
Derivative instruments eligible for offset - liabilities 1,125us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral 973us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
Cash collateral pledged eligible for offset - liabilities 79us-gaap_DerivativeCollateralRightToReclaimCash 24us-gaap_DerivativeCollateralRightToReclaimCash
Net liabilities 174us-gaap_DerivativeLiabilities 247us-gaap_DerivativeLiabilities
Credit Risk-Related Contingent Features [Abstract]    
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features 162us-gaap_DerivativeNetLiabilityPositionAggregateFairValue  
Aggregate fair value of collateral posted on these derivative instruments 127us-gaap_CollateralAlreadyPostedAggregateFairValue  
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade 71us-gaap_AdditionalCollateralAggregateFairValue [1],[2]  
Energy Commodities [Member]    
Offsetting Assets And Liabilities [Line Items]    
Gross assets 1,318us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember		 1,188us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
Derivative instruments eligible for offset - assets 1,060us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember		 912us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
Cash collateral received eligible for offset - assets 10us-gaap_DerivativeCollateralObligationToReturnCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember		 7us-gaap_DerivativeCollateralObligationToReturnCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
Net assets 248us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember		 269us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
Gross liabilities 1,217us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember		 1,070us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
Derivative instruments eligible for offset - liabilities 1,060us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember		 912us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
Cash collateral pledged eligible for offset - liabilities 58us-gaap_DerivativeCollateralRightToReclaimCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember		 1us-gaap_DerivativeCollateralRightToReclaimCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
Net liabilities 99us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember		 157us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
Treasury Derivatives [Member]    
Offsetting Assets And Liabilities [Line Items]    
Gross assets 159us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember		 91us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
Derivative instruments eligible for offset - assets 65us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember		 61us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
Net assets 94us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember		 30us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
Gross liabilities 161us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember		 174us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
Derivative instruments eligible for offset - liabilities 65us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember		 61us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
Cash collateral pledged eligible for offset - liabilities 21us-gaap_DerivativeCollateralRightToReclaimCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember		 23us-gaap_DerivativeCollateralRightToReclaimCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
Net liabilities 75us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember		 90us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
PPL Energy Supply LLC [Member]    
Credit Risk-Related Contingent Features [Abstract]    
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features 98us-gaap_DerivativeNetLiabilityPositionAggregateFairValue
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		  
Aggregate fair value of collateral posted on these derivative instruments 106us-gaap_CollateralAlreadyPostedAggregateFairValue
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		  
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade 26us-gaap_AdditionalCollateralAggregateFairValue
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		 [1],[2]  
PPL Energy Supply LLC [Member] | Energy Commodities [Member]    
Offsetting Assets And Liabilities [Line Items]    
Gross assets 1,318us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		 1,188us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
Derivative instruments eligible for offset - assets 1,060us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		 912us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
Cash collateral received eligible for offset - assets 10us-gaap_DerivativeCollateralObligationToReturnCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		 7us-gaap_DerivativeCollateralObligationToReturnCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
Net assets 248us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		 269us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
Gross liabilities 1,217us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		 1,070us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
Derivative instruments eligible for offset - liabilities 1,060us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		 912us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
Cash collateral pledged eligible for offset - liabilities 58us-gaap_DerivativeCollateralRightToReclaimCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		 1us-gaap_DerivativeCollateralRightToReclaimCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
Net liabilities 99us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember		 157us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
LG And E And KU Energy LLC [Member]    
Credit Risk-Related Contingent Features [Abstract]    
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features 30us-gaap_DerivativeNetLiabilityPositionAggregateFairValue
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember		  
Aggregate fair value of collateral posted on these derivative instruments 21us-gaap_CollateralAlreadyPostedAggregateFairValue
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember		  
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade 10us-gaap_AdditionalCollateralAggregateFairValue
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember		 [1]  
LG And E And KU Energy LLC [Member] | Treasury Derivatives [Member]    
Offsetting Assets And Liabilities [Line Items]    
Gross liabilities 114us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember		 36us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
Cash collateral pledged eligible for offset - liabilities 20us-gaap_DerivativeCollateralRightToReclaimCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember		 20us-gaap_DerivativeCollateralRightToReclaimCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
Net liabilities 94us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember		 16us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
Louisville Gas And Electric Co [Member]    
Credit Risk-Related Contingent Features [Abstract]    
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features 30us-gaap_DerivativeNetLiabilityPositionAggregateFairValue
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember		  
Aggregate fair value of collateral posted on these derivative instruments 21us-gaap_CollateralAlreadyPostedAggregateFairValue
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember		  
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade 10us-gaap_AdditionalCollateralAggregateFairValue
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember		 [1]  
Louisville Gas And Electric Co [Member] | Treasury Derivatives [Member]    
Offsetting Assets And Liabilities [Line Items]    
Gross liabilities 81us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember		 36us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
Cash collateral pledged eligible for offset - liabilities 20us-gaap_DerivativeCollateralRightToReclaimCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember		 20us-gaap_DerivativeCollateralRightToReclaimCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
Net liabilities 61us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember		 16us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
Kentucky Utilities Co [Member] | Treasury Derivatives [Member]    
Offsetting Assets And Liabilities [Line Items]    
Gross liabilities 33us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember		  
Net liabilities $ 33us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember		  
[1]

Includes the effect of net receivables and payables already recorded on the Balance Sheet.

[2]

During the second quarter of 2014, PPL Energy Supply experienced a downgrade in its corporate credit ratings to below investment grade. Amounts related to PPL Energy Supply represent net liability positions subject to further adequate assurance features.