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Derivative Instruments and Hedging Activities (Offseting Derivative Instruments and Credit Risk-Related Features) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Offsetting Assets And Liabilities [Line Items]    
Gross assets $ 1,556us-gaap_DerivativeFairValueOfDerivativeAsset $ 1,477us-gaap_DerivativeFairValueOfDerivativeAsset
Derivative instruments eligible for offset - assets 1,095us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral 1,125us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
Cash collateral received eligible for offset - assets 11us-gaap_DerivativeCollateralObligationToReturnCash 10us-gaap_DerivativeCollateralObligationToReturnCash
Net assets 450us-gaap_DerivativeAssets 342us-gaap_DerivativeAssets
Gross liabilities 1,406us-gaap_DerivativeFairValueOfDerivativeLiability 1,378us-gaap_DerivativeFairValueOfDerivativeLiability
Derivative instruments eligible for offset - liabilities 1,095us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral 1,125us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
Cash collateral pledged eligible for offset - liabilities 70us-gaap_DerivativeCollateralRightToReclaimCash 79us-gaap_DerivativeCollateralRightToReclaimCash
Net liabilities 241us-gaap_DerivativeLiabilities 174us-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 241ppl_DerivativeNetLiabilityPositionAggregateFairValueAlternative  
Aggregate fair value of collateral posted on these derivative instruments 140us-gaap_CollateralAlreadyPostedAggregateFairValue  
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade 128us-gaap_AdditionalCollateralAggregateFairValue [1],[2]  
Energy Commodities [Member]    
Offsetting Assets And Liabilities [Line Items]    
Gross assets 1,298us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
1,318us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
Derivative instruments eligible for offset - assets 990us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
1,060us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
Cash collateral received eligible for offset - assets 11us-gaap_DerivativeCollateralObligationToReturnCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
10us-gaap_DerivativeCollateralObligationToReturnCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
Net assets 297us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
248us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
Gross liabilities 1,163us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
1,217us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
Derivative instruments eligible for offset - liabilities 990us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
1,060us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
Cash collateral pledged eligible for offset - liabilities 49us-gaap_DerivativeCollateralRightToReclaimCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
58us-gaap_DerivativeCollateralRightToReclaimCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
Net liabilities 124us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
99us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
Treasury Derivatives [Member]    
Offsetting Assets And Liabilities [Line Items]    
Gross assets 258us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
159us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
Derivative instruments eligible for offset - assets 105us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
65us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
Net assets 153us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
94us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
Gross liabilities 243us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
161us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
Derivative instruments eligible for offset - liabilities 105us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
65us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
Cash collateral pledged eligible for offset - liabilities 21us-gaap_DerivativeCollateralRightToReclaimCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
21us-gaap_DerivativeCollateralRightToReclaimCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
Net liabilities 117us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
75us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
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 31ppl_DerivativeNetLiabilityPositionAggregateFairValueAlternative
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
 
Aggregate fair value of collateral posted on these derivative instruments 22us-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
[2]  
LG And E And KU Energy LLC [Member] | Treasury Derivatives [Member]    
Offsetting Assets And Liabilities [Line Items]    
Gross liabilities 174us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
114us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
Cash collateral pledged eligible for offset - liabilities 21us-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 153us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
94us-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 31ppl_DerivativeNetLiabilityPositionAggregateFairValueAlternative
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
 
Aggregate fair value of collateral posted on these derivative instruments 22us-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
[2]  
Louisville Gas And Electric Co [Member] | Treasury Derivatives [Member]    
Offsetting Assets And Liabilities [Line Items]    
Gross liabilities 113us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
81us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
Cash collateral pledged eligible for offset - liabilities 21us-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 92us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
61us-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 61us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
33us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
Net liabilities $ 61us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
$ 33us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_SwapMember
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
[1]

PPL Energy Supply's credit rating is currently below investment grade. Amounts related to PPL Energy Supply represent net liability positions subject to further adequate assurance features.

[2]

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