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Leases (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Rent - Operating Leases (Details) [Abstract]      
Operating leases, rent expense $ 80us-gaap_LeaseAndRentalExpense $ 111us-gaap_LeaseAndRentalExpense $ 116us-gaap_LeaseAndRentalExpense
Operating leases, future minimum rental payments due (Details) [Abstract]      
2015 36us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 25us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 20us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 12us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 8us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 34us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total 135us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
PPL Energy Supply LLC [Member]      
Rent - Operating Leases (Details) [Abstract]      
Operating leases, rent expense 29us-gaap_LeaseAndRentalExpense
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
55us-gaap_LeaseAndRentalExpense
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
62us-gaap_LeaseAndRentalExpense
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
Operating leases, future minimum rental payments due (Details) [Abstract]      
2015 11us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
   
2016 11us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
   
2017 10us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
   
2018 4us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
   
2019 1us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
   
Thereafter 2us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
   
Total 39us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
   
LG And E And KU Energy LLC [Member]      
Rent - Operating Leases (Details) [Abstract]      
Operating leases, rent expense 18us-gaap_LeaseAndRentalExpense
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
18us-gaap_LeaseAndRentalExpense
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
18us-gaap_LeaseAndRentalExpense
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
Operating leases, future minimum rental payments due (Details) [Abstract]      
2015 16us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
   
2016 11us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
   
2017 8us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
   
2018 7us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
   
2019 5us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
   
Thereafter 26us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
   
Total 73us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
   
Louisville Gas And Electric Co [Member]      
Rent - Operating Leases (Details) [Abstract]      
Operating leases, rent expense 7us-gaap_LeaseAndRentalExpense
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
7us-gaap_LeaseAndRentalExpense
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
7us-gaap_LeaseAndRentalExpense
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
Operating leases, future minimum rental payments due (Details) [Abstract]      
2015 6us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
   
2016 4us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
   
2017 3us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
   
2018 2us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
   
2019 2us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
   
Thereafter 11us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
   
Total 28us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
   
Kentucky Utilities Co [Member]      
Rent - Operating Leases (Details) [Abstract]      
Operating leases, rent expense 10us-gaap_LeaseAndRentalExpense
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
10us-gaap_LeaseAndRentalExpense
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
10us-gaap_LeaseAndRentalExpense
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
Operating leases, future minimum rental payments due (Details) [Abstract]      
2015 9us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
   
2016 7us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
   
2017 5us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
   
2018 4us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
   
2019 3us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
   
Thereafter 13us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
   
Total $ 41us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember