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Income and Other Taxes (Unrecognized to End) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Integer
Dec. 31, 2013
Dec. 31, 2012
Unrecognized Tax Benefits (Details) [Roll Forward]      
Beginning of period $ 22us-gaap_UnrecognizedTaxBenefits $ 92us-gaap_UnrecognizedTaxBenefits  
Additions based on tax positions of prior years 1us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 3us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions  
Reductions based on tax positions of prior years (2)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (32)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions  
Settlements (1)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities (30)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities  
Lapse of applicable statute of limitation 0us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (11)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations  
End of period 20us-gaap_UnrecognizedTaxBenefits 22us-gaap_UnrecognizedTaxBenefits 92us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits - Probable Increase (Decrease) Next 12 Months (Numeric) [Abstract]      
Total amount unrecognized tax benefits may increase in next 12 months 0us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound    
Total amount unrecognized tax benefits may decrease in next 12 months 20us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeLowerBound    
Total unrecognized tax benefits and related effects that, if recognized, would decrease the effective tax rate 19us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 21us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate  
Open Tax Positions - Accrued Interest (Numeric) [Abstract]      
Accrued interest receivable (payable) related to tax positions 14ppl_AccruedInterestRelatedToOpenTaxPositions 15ppl_AccruedInterestRelatedToOpenTaxPositions  
Open Tax Positions - Interest and Penalties (Numeric) [Abstract]      
Interest expense (benefit) related to tax positions 1ppl_InterestRelatedToOpenTaxPositionsInIncomeTaxExpense (30)ppl_InterestRelatedToOpenTaxPositionsInIncomeTaxExpense (4)ppl_InterestRelatedToOpenTaxPositionsInIncomeTaxExpense
Income Tax Examination (Details) [Line Items]      
Number of major tax jurisdictions tax returns are filed 5ppl_NumberOfMajorTaxJurisdictions    
US - Federal [Member]      
Income Tax Examination (Details) [Line Items]      
Income tax examination, year(s) no longer under examination 1997 and prior    
Pennsylvania - State [Member]      
Income Tax Examination (Details) [Line Items]      
Income tax examination, year(s) no longer under examination 2010 and prior    
Kentucky - State [Member]      
Income Tax Examination (Details) [Line Items]      
Income tax examination, year(s) no longer under examination 2009 and prior    
Montana - State [Member]      
Income Tax Examination (Details) [Line Items]      
Income tax examination, year(s) no longer under examination 2010 and prior    
United Kingdom - Foreign [Member]      
Income Tax Examination (Details) [Line Items]      
Income tax examination, year(s) no longer under examination 2011 and prior    
PPL Energy Supply LLC [Member]      
Unrecognized Tax Benefits (Details) [Roll Forward]      
Beginning of period 15us-gaap_UnrecognizedTaxBenefits
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
30us-gaap_UnrecognizedTaxBenefits
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
 
Reductions based on tax positions of prior years 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
(15)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
 
End of period 15us-gaap_UnrecognizedTaxBenefits
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
15us-gaap_UnrecognizedTaxBenefits
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
30us-gaap_UnrecognizedTaxBenefits
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
Unrecognized Tax Benefits - Probable Increase (Decrease) Next 12 Months (Numeric) [Abstract]      
Total amount unrecognized tax benefits may increase in next 12 months 0us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
   
Total amount unrecognized tax benefits may decrease in next 12 months 15us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeLowerBound
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
   
Total unrecognized tax benefits and related effects that, if recognized, would decrease the effective tax rate 14us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
14us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
 
Open Tax Positions - Accrued Interest (Numeric) [Abstract]      
Accrued interest receivable (payable) related to tax positions 16ppl_AccruedInterestRelatedToOpenTaxPositions
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
15ppl_AccruedInterestRelatedToOpenTaxPositions
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
 
Open Tax Positions - Interest and Penalties (Numeric) [Abstract]      
Interest expense (benefit) related to tax positions (1)ppl_InterestRelatedToOpenTaxPositionsInIncomeTaxExpense
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
5ppl_InterestRelatedToOpenTaxPositionsInIncomeTaxExpense
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
(4)ppl_InterestRelatedToOpenTaxPositionsInIncomeTaxExpense
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
Income Tax Examination (Details) [Line Items]      
Number of major tax jurisdictions tax returns are filed 3ppl_NumberOfMajorTaxJurisdictions
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
   
PPL Energy Supply LLC [Member] | US - Federal [Member]      
Income Tax Examination (Details) [Line Items]      
Income tax examination, year(s) no longer under examination 1997 and prior    
PPL Energy Supply LLC [Member] | Pennsylvania - State [Member]      
Income Tax Examination (Details) [Line Items]      
Income tax examination, year(s) no longer under examination 2010 and prior    
PPL Energy Supply LLC [Member] | Montana - State [Member]      
Income Tax Examination (Details) [Line Items]      
Income tax examination, year(s) no longer under examination 2010 and prior    
PPL Electric Utilities Corp [Member]      
Unrecognized Tax Benefits (Details) [Roll Forward]      
Beginning of period 0us-gaap_UnrecognizedTaxBenefits
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
26us-gaap_UnrecognizedTaxBenefits
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
 
Reductions based on tax positions of prior years 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
(17)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
 
Lapse of applicable statute of limitation 0us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
(9)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
 
End of period 0us-gaap_UnrecognizedTaxBenefits
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
0us-gaap_UnrecognizedTaxBenefits
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
26us-gaap_UnrecognizedTaxBenefits
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
Open Tax Positions - Interest and Penalties (Numeric) [Abstract]      
Interest expense (benefit) related to tax positions $ 0ppl_InterestRelatedToOpenTaxPositionsInIncomeTaxExpense
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
$ (7)ppl_InterestRelatedToOpenTaxPositionsInIncomeTaxExpense
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
$ (4)ppl_InterestRelatedToOpenTaxPositionsInIncomeTaxExpense
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
Income Tax Examination (Details) [Line Items]      
Number of major tax jurisdictions tax returns are filed 2ppl_NumberOfMajorTaxJurisdictions
/ dei_LegalEntityAxis
= ppl_PplElectricUtilitiesCorpMember
   
PPL Electric Utilities Corp [Member] | US - Federal [Member]      
Income Tax Examination (Details) [Line Items]      
Income tax examination, year(s) no longer under examination 1997 and prior    
PPL Electric Utilities Corp [Member] | Pennsylvania - State [Member]      
Income Tax Examination (Details) [Line Items]      
Income tax examination, year(s) no longer under examination 2008 and prior    
LG And E And KU Energy LLC [Member]      
Income Tax Examination (Details) [Line Items]      
Number of major tax jurisdictions tax returns are filed 2ppl_NumberOfMajorTaxJurisdictions
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
   
LG And E And KU Energy LLC [Member] | US - Federal [Member]      
Income Tax Examination (Details) [Line Items]      
Income tax examination, year(s) no longer under examination 10/31/2010 and prior    
LG And E And KU Energy LLC [Member] | Kentucky - State [Member]      
Income Tax Examination (Details) [Line Items]      
Income tax examination, year(s) no longer under examination 2010 and prior    
Louisville Gas And Electric Co [Member]      
Income Tax Examination (Details) [Line Items]      
Number of major tax jurisdictions tax returns are filed 2ppl_NumberOfMajorTaxJurisdictions
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
   
Louisville Gas And Electric Co [Member] | US - Federal [Member]      
Income Tax Examination (Details) [Line Items]      
Income tax examination, year(s) no longer under examination 10/31/2010 and prior    
Louisville Gas And Electric Co [Member] | Kentucky - State [Member]      
Income Tax Examination (Details) [Line Items]      
Income tax examination, year(s) no longer under examination 2010 and prior    
Kentucky Utilities Co [Member]      
Income Tax Examination (Details) [Line Items]      
Number of major tax jurisdictions tax returns are filed 2ppl_NumberOfMajorTaxJurisdictions
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
   
Kentucky Utilities Co [Member] | US - Federal [Member]      
Income Tax Examination (Details) [Line Items]      
Income tax examination, year(s) no longer under examination 10/31/2010 and prior    
Kentucky Utilities Co [Member] | Kentucky - State [Member]      
Income Tax Examination (Details) [Line Items]      
Income tax examination, year(s) no longer under examination 2010 and prior