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Fair Value Measurements and Credit Concentration (Nonrecurring Fair Value Measurements) (Details) (Nonrecurring [Member], Kerr Dam Project [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Nonrecurring Fair Value Measurements [Abstract]    
Loss $ 18us-gaap_ImpairmentOfLongLivedAssetsHeldForUse [1]  
Carrying Amount [Member]
    
Nonrecurring Fair Value Measurements [Abstract]    
Nonrecurring measurement asset value   47us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ppl_KerrDamProjectMember		 [2]
Level 3 [Member]
    
Nonrecurring Fair Value Measurements [Abstract]    
Nonrecurring measurement asset value $ 29us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ppl_KerrDamProjectMember		  
[1]

The loss on the Kerr Dam Project was recorded in the Supply segment and included in "Income (Loss) from Discontinued Operations (net of income taxes)" on the 2014 Statement of Income.

[2]

Represents carrying value before fair value measurement.