Acquisitions, Development and Divestures (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013 kV mi Integer	Dec. 31, 2012
Proposed Bell Bend Nuclear Unit [Member]
Development Projects [Abstract]
Amount currently authorized by Board of Directors to spend on Bell Bend COLA	$ 205
Capitalized costs associated with licensing efforts	165	154
Susquehanna Roseland Transmission Line [Member]
Development Projects [Abstract]
Expected capital cost of an expansion project	630
Total length (in miles) of the expansion project to be routed through Pennsylvania	101
Northeast Pocono Reliability Project [Member]
Development Projects [Abstract]
Expected capital cost of an expansion project	335	200
Total length (in miles) of the expansion project	58
Capacity (in kilovolts) of a transmission line	230
Number of new substations included in request	3
Adder to the return on equity incentive denied in ratemaking request (in basis points)	100
Project costs that qualify for the construction work in progress incentive	308
Ironwood [Member]
Business Acquisition [Line Items]
Acquisition date	Apr. 13, 2012
PPL Energy Supply LLC [Member] | Proposed Bell Bend Nuclear Unit [Member]
Development Projects [Abstract]
Amount currently authorized by Board of Directors to spend on Bell Bend COLA	205
Capitalized costs associated with licensing efforts	165	154
PPL Energy Supply LLC [Member] | Ironwood [Member]
Business Acquisition [Line Items]
Acquisition date	Apr. 13, 2012
PPL Electric Utilities Corp [Member] | Susquehanna Roseland Transmission Line [Member]
Development Projects [Abstract]
Expected capital cost of an expansion project	630
Total length (in miles) of the expansion project to be routed through Pennsylvania	101
PPL Electric Utilities Corp [Member] | Northeast Pocono Reliability Project [Member]
Development Projects [Abstract]
Expected capital cost of an expansion project	335	200
Total length (in miles) of the expansion project	58
Capacity (in kilovolts) of a transmission line	230
Number of new substations included in request	3
Adder to the return on equity incentive denied in ratemaking request (in basis points)	100
Project costs that qualify for the construction work in progress incentive	$ 308