Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified
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12 Months Ended |
Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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PPL Energy Supply LLC [Member] |
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Support Costs (Details) [Abstract] |
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Support cost allocations from subsidiary of parent to registrant |
$ 218ppl_ServiceCostAllocationsParentToSubsidiary / dei_LegalEntityAxis = ppl_PplEnergySupplyLLCMember |
$ 218ppl_ServiceCostAllocationsParentToSubsidiary / dei_LegalEntityAxis = ppl_PplEnergySupplyLLCMember |
$ 212ppl_ServiceCostAllocationsParentToSubsidiary / dei_LegalEntityAxis = ppl_PplEnergySupplyLLCMember |
PPL Energy Supply LLC [Member] | PPL Electric [Member] |
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PLR Contracts/Purchase of Accounts Receivable (Numeric) [Abstract] |
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Credit exposure with affiliate under a Master Supply Agreement |
25ppl_CreditExposureWithAffiliateUnderMasterSupplyAgreement / dei_LegalEntityAxis = ppl_PplEnergySupplyLLCMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ppl_PplElectricUtilitiesCorporationMember |
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PPL Electric Utilities Corp [Member] |
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Support Costs (Details) [Abstract] |
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Support cost allocations from subsidiary of parent to registrant |
151ppl_ServiceCostAllocationsParentToSubsidiary / dei_LegalEntityAxis = ppl_PplElectricUtilitiesCorpMember |
146ppl_ServiceCostAllocationsParentToSubsidiary / dei_LegalEntityAxis = ppl_PplElectricUtilitiesCorpMember |
157ppl_ServiceCostAllocationsParentToSubsidiary / dei_LegalEntityAxis = ppl_PplElectricUtilitiesCorpMember |
Intercompany Borrowings (Numeric) [Abstract] |
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Notes receivable from affiliates |
0us-gaap_NotesReceivableRelatedParties / dei_LegalEntityAxis = ppl_PplElectricUtilitiesCorpMember |
150us-gaap_NotesReceivableRelatedParties / dei_LegalEntityAxis = ppl_PplElectricUtilitiesCorpMember |
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PPL Electric Utilities Corp [Member] | PPL Energy Funding [Member] |
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Intercompany Borrowings (Numeric) [Abstract] |
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Notes receivable from affiliates |
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150us-gaap_NotesReceivableRelatedParties / dei_LegalEntityAxis = ppl_PplElectricUtilitiesCorpMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ppl_PplEnergyFundingCorporationMember |
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Intercompany borrowings demand note rate on outstanding borrowing |
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1.92%us-gaap_RelatedPartyTransactionRate / dei_LegalEntityAxis = ppl_PplElectricUtilitiesCorpMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ppl_PplEnergyFundingCorporationMember |
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LG And E And KU Energy LLC [Member] |
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Support Costs (Details) [Abstract] |
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Support cost allocations from subsidiary of parent to registrant |
15ppl_ServiceCostAllocationsParentToSubsidiary / dei_LegalEntityAxis = ppl_LGAndEAndKUEnergyLLCMember |
15ppl_ServiceCostAllocationsParentToSubsidiary / dei_LegalEntityAxis = ppl_LGAndEAndKUEnergyLLCMember |
15ppl_ServiceCostAllocationsParentToSubsidiary / dei_LegalEntityAxis = ppl_LGAndEAndKUEnergyLLCMember |
Intercompany Borrowings (Numeric) [Abstract] |
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Notes receivable from affiliates |
0us-gaap_NotesReceivableRelatedParties / dei_LegalEntityAxis = ppl_LGAndEAndKUEnergyLLCMember |
70us-gaap_NotesReceivableRelatedParties / dei_LegalEntityAxis = ppl_LGAndEAndKUEnergyLLCMember |
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Notes payable to affiliates |
41us-gaap_NotesPayableRelatedPartiesClassifiedCurrent / dei_LegalEntityAxis = ppl_LGAndEAndKUEnergyLLCMember |
0us-gaap_NotesPayableRelatedPartiesClassifiedCurrent / dei_LegalEntityAxis = ppl_LGAndEAndKUEnergyLLCMember |
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LG And E And KU Energy LLC [Member] | PPL Energy Funding [Member] |
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Intercompany Borrowings (Numeric) [Abstract] |
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Intercompany borrowings demand note rate on outstanding borrowing |
1.65%us-gaap_RelatedPartyTransactionRate / dei_LegalEntityAxis = ppl_LGAndEAndKUEnergyLLCMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ppl_PplEnergyFundingCorporationMember |
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Notes payable to affiliates |
41us-gaap_NotesPayableRelatedPartiesClassifiedCurrent / dei_LegalEntityAxis = ppl_LGAndEAndKUEnergyLLCMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ppl_PplEnergyFundingCorporationMember |
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Intercompany note with affiliate maximum borrowing capacity |
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225ppl_IntercompanyNoteAffiliateMaximumBorrowingCapacity / dei_LegalEntityAxis = ppl_LGAndEAndKUEnergyLLCMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ppl_PplEnergyFundingCorporationMember |
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Amount of capacity reduction to existing affiliate credit facility |
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75ppl_RelatedPartyTransactionAffiliateCreditFacilityCapacityReduction / dei_LegalEntityAxis = ppl_LGAndEAndKUEnergyLLCMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ppl_PplEnergyFundingCorporationMember |
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LG And E And KU Energy LLC [Member] | PPL Affiliate [Member] |
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Intercompany Borrowings (Numeric) [Abstract] |
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Notes receivable from affiliates |
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70us-gaap_NotesReceivableRelatedParties / dei_LegalEntityAxis = ppl_LGAndEAndKUEnergyLLCMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ppl_CompanyAffiliateMember |
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Intercompany borrowings demand note rate on outstanding borrowing |
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2.17%us-gaap_RelatedPartyTransactionRate / dei_LegalEntityAxis = ppl_LGAndEAndKUEnergyLLCMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ppl_CompanyAffiliateMember |
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Intercompany note with affiliate maximum borrowing capacity |
300ppl_IntercompanyNoteAffiliateMaximumBorrowingCapacity / dei_LegalEntityAxis = ppl_LGAndEAndKUEnergyLLCMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ppl_CompanyAffiliateMember |
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Louisville Gas And Electric Co [Member] |
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Intercompany Billings by LKS (Details) [Abstract] |
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Intercompany billings between affiliates |
203ppl_IntercompanyBillingBetweenAffiliates / dei_LegalEntityAxis = ppl_LouisvilleGasAndElectricCoMember |
216ppl_IntercompanyBillingBetweenAffiliates / dei_LegalEntityAxis = ppl_LouisvilleGasAndElectricCoMember |
186ppl_IntercompanyBillingBetweenAffiliates / dei_LegalEntityAxis = ppl_LouisvilleGasAndElectricCoMember |
Kentucky Utilities Co [Member] |
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Intercompany Billings by LKS (Details) [Abstract] |
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Intercompany billings between affiliates |
$ 225ppl_IntercompanyBillingBetweenAffiliates / dei_LegalEntityAxis = ppl_KentuckyUtilitiesCoMember |
$ 207ppl_IntercompanyBillingBetweenAffiliates / dei_LegalEntityAxis = ppl_KentuckyUtilitiesCoMember |
$ 161ppl_IntercompanyBillingBetweenAffiliates / dei_LegalEntityAxis = ppl_KentuckyUtilitiesCoMember |