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Income and Other Taxes (Credit Carryforwards and Valuation Allowances and Reserves) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Valuation Allowances and Reserves (Details) [Roll Forward]      
Reduction of the valuation allowance as a result of the reduction in the UK statutory income tax rate   $ 67,000,000ppl_ValuationRollforwardSpecificTransactionDeductions $ 46,000,000ppl_ValuationRollforwardSpecificTransactionDeductions
Permanently reinvested cumulative undistributed foreign earnings 3,700,000,000ppl_UndistributedForeignEarningsReinvested 2,900,000,000ppl_UndistributedForeignEarningsReinvested  
Valuation Allowance Of Deferred Tax Assets [Member]      
Valuation Allowances and Reserves (Details) [Roll Forward]      
Balance at beginning of period 663,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
706,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
724,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
Additions charged to income 57,000,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
29,000,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
18,000,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
Additions charged to other accounts 6,000,000us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
10,000,000us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
Deductions 26,000,000us-gaap_ValuationAllowancesAndReservesDeductions
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
72,000,000us-gaap_ValuationAllowancesAndReservesDeductions
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
[1] 46,000,000us-gaap_ValuationAllowancesAndReservesDeductions
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
[1]
Balance at end of period 700,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
663,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
706,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
Investment Tax Credit [Member] | Federal [Member]      
Credit carryforwards      
Credit carryforwards, amount 125,000,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_InvestmentCreditMember
   
Investment Tax Credit [Member] | Federal [Member] | Minimum [Member]      
Credit carryforwards      
Expiration 2025-12-31    
Investment Tax Credit [Member] | Federal [Member] | Maximum [Member]      
Credit carryforwards      
Expiration 2028-12-31    
Alternative Minimum Tax Credit [Member] | Federal [Member]      
Credit carryforwards      
Credit carryforwards, amount 44,000,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= ppl_AlternativeMinimumTaxCreditMember
   
Other [Member] | Federal [Member]      
Credit carryforwards      
Credit carryforwards, amount 34,000,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_GeneralBusinessMember
   
Other [Member] | Federal [Member] | Minimum [Member]      
Credit carryforwards      
Expiration 2016-12-31    
Other [Member] | Federal [Member] | Maximum [Member]      
Credit carryforwards      
Expiration 2034-12-31    
Other [Member] | State [Member]      
Credit carryforwards      
Credit carryforwards, amount 8,000,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_GeneralBusinessMember
   
Expiration 2022-12-31    
PPL Energy Supply LLC [Member] | Valuation Allowance Of Deferred Tax Assets [Member]      
Valuation Allowances and Reserves (Details) [Roll Forward]      
Balance at beginning of period 78,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
74,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
72,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
Additions charged to income 0us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
4,000,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
2,000,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
Additions charged to other accounts 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
Deductions 0us-gaap_ValuationAllowancesAndReservesDeductions
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
0us-gaap_ValuationAllowancesAndReservesDeductions
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
0us-gaap_ValuationAllowancesAndReservesDeductions
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
Balance at end of period 78,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
78,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
74,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
PPL Energy Supply LLC [Member] | Alternative Minimum Tax Credit [Member] | Federal [Member]      
Credit carryforwards      
Credit carryforwards, amount 6,000,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_TaxCreditCarryforwardAxis
= ppl_AlternativeMinimumTaxCreditMember
   
PPL Energy Supply LLC [Member] | Other [Member] | Federal [Member]      
Credit carryforwards      
Credit carryforwards, amount 7,000,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ dei_LegalEntityAxis
= ppl_PplEnergySupplyLLCMember
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_GeneralBusinessMember
   
PPL Energy Supply LLC [Member] | Other [Member] | Federal [Member] | Minimum [Member]      
Credit carryforwards      
Expiration 2031-12-31    
PPL Energy Supply LLC [Member] | Other [Member] | Federal [Member] | Maximum [Member]      
Credit carryforwards      
Expiration 2034-12-31    
LG And E And KU Energy LLC [Member] | Valuation Allowance Of Deferred Tax Assets [Member]      
Valuation Allowances and Reserves (Details) [Roll Forward]      
Balance at beginning of period 4,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
5,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
5,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
Additions charged to other accounts 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
Deductions 4,000,000us-gaap_ValuationAllowancesAndReservesDeductions
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
[2] 1,000,000us-gaap_ValuationAllowancesAndReservesDeductions
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
[2] 0us-gaap_ValuationAllowancesAndReservesDeductions
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
Balance at end of period 0us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
4,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
5,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
LG And E And KU Energy LLC [Member] | Investment Tax Credit [Member] | Federal [Member]      
Credit carryforwards      
Credit carryforwards, amount 125,000,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_InvestmentCreditMember
   
LG And E And KU Energy LLC [Member] | Investment Tax Credit [Member] | Federal [Member] | Minimum [Member]      
Credit carryforwards      
Expiration 2025-12-31    
LG And E And KU Energy LLC [Member] | Investment Tax Credit [Member] | Federal [Member] | Maximum [Member]      
Credit carryforwards      
Expiration 2028-12-31    
LG And E And KU Energy LLC [Member] | Alternative Minimum Tax Credit [Member] | Federal [Member]      
Credit carryforwards      
Credit carryforwards, amount 30,000,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_TaxCreditCarryforwardAxis
= ppl_AlternativeMinimumTaxCreditMember
   
LG And E And KU Energy LLC [Member] | Other [Member] | Federal [Member]      
Credit carryforwards      
Credit carryforwards, amount 27,000,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_GeneralBusinessMember
   
LG And E And KU Energy LLC [Member] | Other [Member] | Federal [Member] | Minimum [Member]      
Credit carryforwards      
Expiration 2016-12-31    
LG And E And KU Energy LLC [Member] | Other [Member] | Federal [Member] | Maximum [Member]      
Credit carryforwards      
Expiration 2034-12-31    
LG And E And KU Energy LLC [Member] | Other [Member] | State [Member]      
Credit carryforwards      
Credit carryforwards, amount 8,000,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ dei_LegalEntityAxis
= ppl_LGAndEAndKUEnergyLLCMember
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_GeneralBusinessMember
   
Expiration 2022-12-31    
Louisville Gas And Electric Co [Member] | State [Member]      
Credit carryforwards      
Credit carryforwards, amount 4,000,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ dei_LegalEntityAxis
= ppl_LouisvilleGasAndElectricCoMember
   
Expiration 2022-12-31    
Kentucky Utilities Co [Member] | State [Member]      
Credit carryforwards      
Credit carryforwards, amount $ 4,000,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ dei_LegalEntityAxis
= ppl_KentuckyUtilitiesCoMember
   
Expiration 2022-12-31    
[1]

The reductions of the U.K. statutory income tax rate in 2013 and 2012 resulted in $67 million and $46 million in reductions in deferred tax assets and the corresponding valuation allowances. See "Reconciliation of Income Tax Expense" below for more information on the impact of the U.K. Finance Acts 2013 and 2012.

[2]

Primarily related to the expiration of state capital loss carryforwards.