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SCHEDULE I - CONDENSED UNCONSOLIDATED STATEMENTS OF CASH FLOWS (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash Flows from Operating Activities [Abstact]      
Net cash provided by (used in) operating activities $ 3,403us-gaap_NetCashProvidedByUsedInOperatingActivities $ 2,857us-gaap_NetCashProvidedByUsedInOperatingActivities $ 2,764us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash Flows from Investing Activities [Abstact]      
Net cash provided by (used in) investing activities (3,329)us-gaap_NetCashProvidedByUsedInInvestingActivities (4,295)us-gaap_NetCashProvidedByUsedInInvestingActivities (3,123)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash Flows from Financing Activities [Abstract]      
Issuance of equity, net of issuance costs 1,074us-gaap_ProceedsFromIssuanceOfCommonStock 1,411us-gaap_ProceedsFromIssuanceOfCommonStock 72us-gaap_ProceedsFromIssuanceOfCommonStock
Net increase (decrease) in short-term debt 777us-gaap_ProceedsFromRepaymentsOfShortTermDebt 49us-gaap_ProceedsFromRepaymentsOfShortTermDebt 74us-gaap_ProceedsFromRepaymentsOfShortTermDebt
Retirement of long-term debt (546)us-gaap_RepaymentsOfLongTermDebt (747)us-gaap_RepaymentsOfLongTermDebt (108)us-gaap_RepaymentsOfLongTermDebt
Issuance of long-term debt 296us-gaap_ProceedsFromIssuanceOfLongTermDebt 2,038us-gaap_ProceedsFromIssuanceOfLongTermDebt 1,223us-gaap_ProceedsFromIssuanceOfLongTermDebt
Debt-issuance costs (22)ppl_PaymentOfDebtIssuanceCostsShortAndLongTermFacilities (49)ppl_PaymentOfDebtIssuanceCostsShortAndLongTermFacilities (17)ppl_PaymentOfDebtIssuanceCostsShortAndLongTermFacilities
Payment of common stock dividends (967)us-gaap_PaymentsOfDividendsCommonStock (878)us-gaap_PaymentsOfDividendsCommonStock (833)us-gaap_PaymentsOfDividendsCommonStock
Contract adjustment payments on Equity Units (22)ppl_PaymentsForContractualAdjustments (82)ppl_PaymentsForContractualAdjustments (94)ppl_PaymentsForContractualAdjustments
Repurchase of common stock 0us-gaap_PaymentsForRepurchaseOfCommonStock (74)us-gaap_PaymentsForRepurchaseOfCommonStock 0us-gaap_PaymentsForRepurchaseOfCommonStock
Other (7)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (37)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (19)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash provided by (used in) financing activities 583us-gaap_NetCashProvidedByUsedInFinancingActivities 1,631us-gaap_NetCashProvidedByUsedInFinancingActivities 48us-gaap_NetCashProvidedByUsedInFinancingActivities
Net Increase (Decrease) in Cash and Cash Equivalents 649us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 201us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (301)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and Cash Equivalents at Beginning of Period 1,102us-gaap_CashAndCashEquivalentsAtCarryingValue 901us-gaap_CashAndCashEquivalentsAtCarryingValue 1,202us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and Cash Equivalents at End of Period 1,751us-gaap_CashAndCashEquivalentsAtCarryingValue 1,102us-gaap_CashAndCashEquivalentsAtCarryingValue 901us-gaap_CashAndCashEquivalentsAtCarryingValue
PPL Corp [Member]      
Cash Flows from Operating Activities [Abstact]      
Net cash provided by (used in) operating activities 1,633us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
968us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
937us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash Flows from Investing Activities [Abstact]      
Capital contributions to affiliated subsidiaries (1,045)us-gaap_PaymentsToAcquireEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(496)us-gaap_PaymentsToAcquireEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(221)us-gaap_PaymentsToAcquireEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Return of capital from affiliated subsidiaries 247ppl_ProceedsFromReturnOfCapitalFromAffiliates
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
213ppl_ProceedsFromReturnOfCapitalFromAffiliates
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0ppl_ProceedsFromReturnOfCapitalFromAffiliates
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash provided by (used in) investing activities (798)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(283)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(221)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash Flows from Financing Activities [Abstract]      
Issuance of equity, net of issuance costs 1,074us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,411us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
72us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net increase (decrease) in short-term debt (913)us-gaap_ProceedsFromRepaymentsOfShortTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,057)us-gaap_ProceedsFromRepaymentsOfShortTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
149us-gaap_ProceedsFromRepaymentsOfShortTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Payment of common stock dividends (967)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(878)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(833)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Contract adjustment payments on Equity Units (22)ppl_PaymentsForContractualAdjustments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(82)ppl_PaymentsForContractualAdjustments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(94)ppl_PaymentsForContractualAdjustments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Repurchase of common stock 0us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(74)us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other (7)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(5)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(10)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash provided by (used in) financing activities (835)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(685)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(716)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Supplemental Disclosures of Cash Flow Information: [Abstract]      
Cash Dividends Received from Affiliated Subsidiaries 1,388us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
960us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
720us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
L G And E And K U Energy L L C Unconsolidated [Member]      
Cash Flows from Operating Activities [Abstact]      
Net cash provided by (used in) operating activities (183)us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
136us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
364us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
Cash Flows from Investing Activities [Abstact]      
Capital contributions to affiliated subsidiaries (248)us-gaap_PaymentsToAcquireEquityMethodInvestments
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
(243)us-gaap_PaymentsToAcquireEquityMethodInvestments
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
0us-gaap_PaymentsToAcquireEquityMethodInvestments
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
Net (increase) decrease in notes receivable from affiliates 555us-gaap_IncreaseDecreaseInNotesReceivableRelatedPartiesCurrent
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
(122)us-gaap_IncreaseDecreaseInNotesReceivableRelatedPartiesCurrent
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
(15)us-gaap_IncreaseDecreaseInNotesReceivableRelatedPartiesCurrent
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
Net cash provided by (used in) investing activities 307us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
(365)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
(15)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
Cash Flows from Financing Activities [Abstract]      
Net increase (decrease) in notes payable to affiliates 58us-gaap_IncreaseDecreaseInNotesPayableRelatedPartiesCurrent
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
171us-gaap_IncreaseDecreaseInNotesPayableRelatedPartiesCurrent
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
(196)us-gaap_IncreaseDecreaseInNotesPayableRelatedPartiesCurrent
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
Net increase (decrease) in short-term debt 0us-gaap_ProceedsFromRepaymentsOfShortTermDebt
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
75us-gaap_ProceedsFromRepaymentsOfShortTermDebt
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
0us-gaap_ProceedsFromRepaymentsOfShortTermDebt
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
Contributions from member 248us-gaap_ProceedsFromContributionsFromAffiliates
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
243us-gaap_ProceedsFromContributionsFromAffiliates
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
0us-gaap_ProceedsFromContributionsFromAffiliates
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
Distributions to member (436)ppl_PaymentOfDistributionsToAffiliate
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
(254)ppl_PaymentOfDistributionsToAffiliate
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
(155)ppl_PaymentOfDistributionsToAffiliate
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
Net cash provided by (used in) financing activities (130)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
235us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
(351)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
Net Increase (Decrease) in Cash and Cash Equivalents (6)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
6us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
(2)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
Cash and Cash Equivalents at Beginning of Period 6us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
2us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
Cash and Cash Equivalents at End of Period 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
6us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
Supplemental Disclosures of Cash Flow Information: [Abstract]      
Cash Dividends Received from Affiliated Subsidiaries $ 260us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
$ 223us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember
$ 175us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCUnconsolidatedMember