Acquisitions, Development and Divestures (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 mi	Dec. 31, 2013
Other - Montana Hydro Sale Agreement (Numeric) [Line Items]
Capacity of facilities to be sold (in MW)	633
Agreed upon sales price for disposal of hydroelectric facilities owned by PPL Montana	$ 900
Number of hydroelectric facilities owned by PPL Montana to be sold	11
Rainbow Hydroelectric Plant Expansion [Member]
Development Projects [Abstract]
Treasury grants approved, accepted and to be received in lieu of tax credits	56
Cumulative deferred investments tax credits to be recaptured	60
Susquehanna Roseland Transmission Line [Member]
Development Projects [Abstract]
Expected capital cost of an expansion project	630
Project costs capitalized	458	377
Total length (in miles) of the expansion project to be routed through Pennsylvania	101
PPL Energy Supply LLC [Member]
Other - Montana Hydro Sale Agreement (Numeric) [Line Items]
Capacity of facilities to be sold (in MW)	633
Agreed upon sales price for disposal of hydroelectric facilities owned by PPL Montana	900
Number of hydroelectric facilities owned by PPL Montana to be sold	11
PPL Energy Supply LLC [Member] | Rainbow Hydroelectric Plant Expansion [Member]
Development Projects [Abstract]
Treasury grants approved, accepted and to be received in lieu of tax credits	56
Cumulative deferred investments tax credits to be recaptured	60
PPL Electric Utilities Corp [Member] | Susquehanna Roseland Transmission Line [Member]
Development Projects [Abstract]
Expected capital cost of an expansion project	630
Project costs capitalized	$ 458	$ 377
Total length (in miles) of the expansion project to be routed through Pennsylvania	101