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SCHEDULE I - NOTES TO CONDENSED UNCONSOLIDATED FINANCIAL STATEMENTS (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Aggregate maturities of long-term debt (Details) [Abstract]  
2015 $ 1,535us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
After 2019 16,960us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
LKE Guarantee [Member] | Indemnification Guarantee [Member] | Indemnification Of Lease Termination And Other Divestitures [Member]  
Condensed Unconsolidated Financial Statements [Line Items]  
Maximum exposure 301us-gaap_GuaranteeObligationsMaximumExposure
/ ppl_GuaranteeByDescriptionAxis
= ppl_IndemnificationsIssuedByLkeMember
/ ppl_GuaranteeByEntityAxis
= ppl_LouisvilleGasAndElectricAndKuEnergyGuaranteeMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_IndemnificationGuaranteeMember
[1]
Term of guarantee (in years) 12
Expiration date minimum 2021
Maximum exposure of guarantee related to terminated lease specific to operational, regulatory and environmental issues 200ppl_GuaranteeMaximumExposure2021
/ ppl_GuaranteeByDescriptionAxis
= ppl_IndemnificationsIssuedByLkeMember
/ ppl_GuaranteeByEntityAxis
= ppl_LouisvilleGasAndElectricAndKuEnergyGuaranteeMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_IndemnificationGuaranteeMember
Maximum exposure of other guarantees expiring related to a terminated lease 100ppl_GuaranteeMaximumExposure2023
/ ppl_GuaranteeByDescriptionAxis
= ppl_IndemnificationsIssuedByLkeMember
/ ppl_GuaranteeByEntityAxis
= ppl_LouisvilleGasAndElectricAndKuEnergyGuaranteeMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_IndemnificationGuaranteeMember
Expiration date maximum 2023
Charge recorded in discontinued operations relating to certain indemnification, pre-tax 9us-gaap_LossContingencyLossInPeriod
/ ppl_GuaranteeByDescriptionAxis
= ppl_IndemnificationsIssuedByLkeMember
/ ppl_GuaranteeByEntityAxis
= ppl_LouisvilleGasAndElectricAndKuEnergyGuaranteeMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_IndemnificationGuaranteeMember
Charge recorded in discontinued operations relating to certain indemnification, after-tax 5ppl_LossContingencyLossInPeriodAfterTax
/ ppl_GuaranteeByDescriptionAxis
= ppl_IndemnificationsIssuedByLkeMember
/ ppl_GuaranteeByEntityAxis
= ppl_LouisvilleGasAndElectricAndKuEnergyGuaranteeMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_IndemnificationGuaranteeMember
PPL Corp [Member] | PPL Guarantee [Member] | Financial Guarantee [Member] | Guarantee Of Principal And Premium And Interest [Member]  
Condensed Unconsolidated Financial Statements [Line Items]  
Maximum exposure 8,100us-gaap_GuaranteeObligationsMaximumExposure
/ ppl_GuaranteeByDescriptionAxis
= ppl_IndemnificationsIssuedByPplCapitalFundingMember
/ ppl_GuaranteeByEntityAxis
= ppl_PplGuaranteeMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_FinancialGuaranteeMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Expiration date 2073
LG&E and KU Energy LLC Unconsolidated  
Aggregate maturities of long-term debt (Details) [Abstract]  
2015 400us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
After 2019 722us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
LG&E and KU Energy LLC Unconsolidated | LKE Guarantee [Member] | Indemnification Guarantee [Member] | Indemnification Of Lease Termination And Other Divestitures [Member]  
Condensed Unconsolidated Financial Statements [Line Items]  
Term of guarantee (in years) 12
Expiration date minimum 2021
Maximum exposure of guarantee related to terminated lease specific to operational, regulatory and environmental issues 200ppl_GuaranteeMaximumExposure2021
/ ppl_GuaranteeByDescriptionAxis
= ppl_IndemnificationsIssuedByLkeMember
/ ppl_GuaranteeByEntityAxis
= ppl_LouisvilleGasAndElectricAndKuEnergyGuaranteeMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_IndemnificationGuaranteeMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
Maximum exposure of other guarantees expiring related to a terminated lease 100ppl_GuaranteeMaximumExposure2023
/ ppl_GuaranteeByDescriptionAxis
= ppl_IndemnificationsIssuedByLkeMember
/ ppl_GuaranteeByEntityAxis
= ppl_LouisvilleGasAndElectricAndKuEnergyGuaranteeMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_IndemnificationGuaranteeMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
Expiration date maximum 2023
Charge recorded in discontinued operations relating to certain indemnification, pre-tax 9us-gaap_LossContingencyLossInPeriod
/ ppl_GuaranteeByDescriptionAxis
= ppl_IndemnificationsIssuedByLkeMember
/ ppl_GuaranteeByEntityAxis
= ppl_LouisvilleGasAndElectricAndKuEnergyGuaranteeMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_IndemnificationGuaranteeMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
Charge recorded in discontinued operations relating to certain indemnification, after-tax $ 5ppl_LossContingencyLossInPeriodAfterTax
/ ppl_GuaranteeByDescriptionAxis
= ppl_IndemnificationsIssuedByLkeMember
/ ppl_GuaranteeByEntityAxis
= ppl_LouisvilleGasAndElectricAndKuEnergyGuaranteeMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_IndemnificationGuaranteeMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
[1]

LKE provides certain indemnifications, the most significant of which relate to the termination of the WKE lease in July 2009.These guarantees cover the due and punctual payment, performance and discharge by each party of its respective present and future obligations. The most comprehensive of these WKE-related guarantees is the LKE guarantee covering operational, regulatory and environmental commitments and indemnifications made by WKE under the WKE Transaction Termination Agreement. This guarantee has a term of 12 years ending July 2021, and a cumulative maximum exposure of $200 million. Certain items such as government fines and penalties fall outside the cumulative cap.Another WKE-related LKE guarantee covers other indemnifications, has a term expiring in 2023 and a maximum exposure of $100 million. In May 2012, LKE's indemnitee received an unfavorable arbitration panel's decision interpreting this matter, which granted LKE’s indemnitee certain rights of first refusal to purchase excess power at a market-based price rather than at an absolute fixed price. In January 2013, LKE's indemnitee commenced a proceeding in the Kentucky Court of Appeals appealing a December 2012 order of the Henderson Circuit Court, confirming the arbitration award.In May 2014, the Court of Appeals issued an opinion affirming the lower court decision. LKE's indemnitee filed a Motion for Discretionary Review with the Kentucky Supreme Court on October 2, 2014.LKE believes its indemnification obligations in this matter remain subject to various uncertainties, including potential for additional legal challenges regarding the arbitration decision as well as future prices, availability and demand for the subject excess power. LKE continues to evaluate various legal and commercial options with respect to this indemnification matter. The ultimate outcomes of the WKE termination-related indemnifications cannot be predicted at this time. In the second quarter of 2012, LKE adjusted its estimated liability for the WKE-related indemnifications by $9 million ($5 million after-tax), which is reflected in "Income (Loss) from Discontinued Operations (net of income taxes)" on the Statement of Income. The adjustment was recorded in the Kentucky Regulated segment for PPL. Additionally, LKE has indemnified various third parties related to historical obligations for other divested subsidiaries and affiliates. The indemnifications vary by entity and the maximum exposures range from being capped at the sale price to no specified maximum; LKE could be required to perform on these indemnifications in the event of covered losses or liabilities being claimed by an indemnified party. However, LKE is not aware of formal claims under such indemnities made by any party at this time. LKE cannot predict the ultimate outcomes of indemnification circumstances, but does not currently expect such outcomes to result in significant losses above the amounts recorded.