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Fair Value Measurements and Credit Concentration (Nonrecurring Fair Value Measurements) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2011
Nonrecurring [Member] | Equity Investment In Electric Energy Incorporated [Member]        
Nonrecurring Fair Value Measurements [Abstract]        
Loss $ 25us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ us-gaap_FairValueByAssetClassAxis
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Nonrecurring [Member] | Kerr Dam Project [Member] | Asset Class [Domain]        
Nonrecurring Fair Value Measurements [Abstract]        
Loss   18us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain
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= ppl_KerrDamProjectMember		 [1],[2]    
Nonrecurring [Member] | Corette Plant And Emission Allowances [Member] | Asset Class [Domain]        
Nonrecurring Fair Value Measurements [Abstract]        
Loss     65us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain
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/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ppl_CorettePlantEmissionAllowancesMember		 [1]  
Nonrecurring [Member] | Carrying Amount [Member] | Equity Investment In Electric Energy Incorporated [Member]        
Nonrecurring Fair Value Measurements [Abstract]        
Nonrecurring measurement asset value       25us-gaap_AssetsFairValueDisclosureNonrecurring
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= us-gaap_FairValueMeasurementsNonrecurringMember		 [3]
Nonrecurring [Member] | Carrying Amount [Member] | Kerr Dam Project [Member] | Asset Class [Domain]        
Nonrecurring Fair Value Measurements [Abstract]        
Nonrecurring measurement asset value     47us-gaap_AssetsFairValueDisclosureNonrecurring
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= us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ppl_KerrDamProjectMember		 [2],[3]  
Nonrecurring [Member] | Carrying Amount [Member] | Corette Plant And Emission Allowances [Member] | Asset Class [Domain]        
Nonrecurring Fair Value Measurements [Abstract]        
Nonrecurring measurement asset value 65us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ppl_CorettePlantEmissionAllowancesMember		 [3]      
Nonrecurring [Member] | Level 3 [Member] | Equity Investment In Electric Energy Incorporated [Member]        
Nonrecurring Fair Value Measurements [Abstract]        
Nonrecurring measurement asset value 0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		      
Nonrecurring [Member] | Level 3 [Member] | Kerr Dam Project [Member] | Asset Class [Domain]        
Nonrecurring Fair Value Measurements [Abstract]        
Nonrecurring measurement asset value   29us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
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Nonrecurring [Member] | Level 3 [Member] | Corette Plant And Emission Allowances [Member] | Asset Class [Domain]        
Nonrecurring Fair Value Measurements [Abstract]        
Nonrecurring measurement asset value     0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain
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= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ppl_CorettePlantEmissionAllowancesMember		  
PPL Energy Supply LLC [Member] | Nonrecurring [Member] | Kerr Dam Project [Member] | Asset Class [Domain]        
Nonrecurring Fair Value Measurements [Abstract]        
Loss   18us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain
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/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ppl_KerrDamProjectMember		 [1],[2]    
PPL Energy Supply LLC [Member] | Nonrecurring [Member] | Corette Plant And Emission Allowances [Member] | Asset Class [Domain]        
Nonrecurring Fair Value Measurements [Abstract]        
Loss     65us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain
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PPL Energy Supply LLC [Member] | Nonrecurring [Member] | Carrying Amount [Member] | Kerr Dam Project [Member] | Asset Class [Domain]        
Nonrecurring Fair Value Measurements [Abstract]        
Nonrecurring measurement asset value     47us-gaap_AssetsFairValueDisclosureNonrecurring
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/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ppl_KerrDamProjectMember		 [2],[3]  
PPL Energy Supply LLC [Member] | Nonrecurring [Member] | Carrying Amount [Member] | Corette Plant And Emission Allowances [Member] | Asset Class [Domain]        
Nonrecurring Fair Value Measurements [Abstract]        
Nonrecurring measurement asset value 65us-gaap_AssetsFairValueDisclosureNonrecurring
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= ppl_PplEnergySupplyLLCMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ppl_CorettePlantEmissionAllowancesMember		 [3]      
PPL Energy Supply LLC [Member] | Nonrecurring [Member] | Level 3 [Member] | Kerr Dam Project [Member] | Asset Class [Domain]        
Nonrecurring Fair Value Measurements [Abstract]        
Nonrecurring measurement asset value   29us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain
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/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ppl_KerrDamProjectMember		 [2]    
PPL Energy Supply LLC [Member] | Nonrecurring [Member] | Level 3 [Member] | Corette Plant And Emission Allowances [Member] | Asset Class [Domain]        
Nonrecurring Fair Value Measurements [Abstract]        
Nonrecurring measurement asset value     0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
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= ppl_PplEnergySupplyLLCMember
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= ppl_CorettePlantEmissionAllowancesMember		  
LG And E And KU Energy LLC [Member] | Level 3 [Member] | Equity Investment In Electric Energy Incorporated [Member]        
Nonrecurring Fair Value Measurements [Abstract]        
Nonrecurring measurement asset value 0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquityMethodInvestmentsMember
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= ppl_LGAndEAndKUEnergyLLCMember		      
LG And E And KU Energy LLC [Member] | Nonrecurring [Member] | Equity Investment In Electric Energy Incorporated [Member]        
Nonrecurring Fair Value Measurements [Abstract]        
Loss 25us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ us-gaap_FairValueByAssetClassAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember		 [1]      
LG And E And KU Energy LLC [Member] | Nonrecurring [Member] | Carrying Amount [Member] | Equity Investment In Electric Energy Incorporated [Member]        
Nonrecurring Fair Value Measurements [Abstract]        
Nonrecurring measurement asset value       25us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
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= ppl_LGAndEAndKUEnergyLLCMember		 [3]
Kentucky Utilities Co [Member] | Nonrecurring [Member] | Equity Investment In Electric Energy Incorporated [Member]        
Nonrecurring Fair Value Measurements [Abstract]        
Loss 25us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ us-gaap_FairValueByAssetClassAxis
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Kentucky Utilities Co [Member] | Nonrecurring [Member] | Carrying Amount [Member] | Equity Investment In Electric Energy Incorporated [Member]        
Nonrecurring Fair Value Measurements [Abstract]        
Nonrecurring measurement asset value       25us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
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Kentucky Utilities Co [Member] | Nonrecurring [Member] | Level 3 [Member] | Equity Investment In Electric Energy Incorporated [Member]        
Nonrecurring Fair Value Measurements [Abstract]        
Nonrecurring measurement asset value $ 0us-gaap_AssetsFairValueDisclosureNonrecurring
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[1]

The loss on the Kerr Dam Project was recorded in the Supply segment and included in "Income (Loss) from Discontinued Operations (net of income taxes)" on the Statement of Income. The loss on the Corette plant and emission allowances was recorded in the Supply segment and included in "Other operation and maintenance" on the Statement of Income. The loss on the EEI investment was recorded in the Kentucky Regulated segment and included in "Other-Than-Temporary Impairments" on the Statement of Income.
[2]

The Kerr Dam Project was included in the sale of the Montana Hydroelectric facilities and the assets were removed from the Balance Sheet. See Note 8 for additional information.

[3]

Represents carrying value before fair value measurement.