Acquisitions, Development and Divestures (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended						3 Months Ended
	Mar. 31, 2013 Proposed Bell Bend Nuclear Unit [Member]	Dec. 31, 2012 Proposed Bell Bend Nuclear Unit [Member]	Mar. 31, 2013 Rainbow Hydroelectric Plant Expansion [Member] MW	Mar. 31, 2013 Susquehanna Roseland Transmission Line [Member] mi	Mar. 31, 2013 Northeast Pocono Reliability Project [Member] kV mi Integer	Mar. 31, 2013 Ironwood [Member]	Mar. 31, 2013 PPL Energy Supply LLC [Member] Proposed Bell Bend Nuclear Unit [Member]	Dec. 31, 2012 PPL Energy Supply LLC [Member] Proposed Bell Bend Nuclear Unit [Member]	Mar. 31, 2013 PPL Energy Supply LLC [Member] Rainbow Hydroelectric Plant Expansion [Member] MW	Mar. 31, 2013 PPL Energy Supply LLC [Member] Ironwood [Member]	Mar. 31, 2013 PPL Electric Utilities Corp [Member] Susquehanna Roseland Transmission Line [Member] mi	Mar. 31, 2013 PPL Electric Utilities Corp [Member] Northeast Pocono Reliability Project [Member] mi kV Integer
Business Acquisition [Line Items]
Acquisition date						Apr. 13, 2012				Apr. 13, 2012
Development Projects [Abstract]
Planned capacity expansion (in MW)			28						28
Expected capital cost of an expansion project				$ 630	$ 200						$ 630	$ 200
Amount currently authorized by Board of Directors to spend on Bell Bend COLA	205						205
Capitalized costs associated with licensing efforts	159	154					159	154
Total length (in miles) of the expansion project					58							58
Capacity (in kilovolts) of a transmission line					230							230
Total length (in miles) of the expansion project to be routed through Pennsylvania				101							101
Number of new substations included in request					3							3
Adder to the return on equity incentive denied in ratemaking request (in basis points)					100							100
Project costs that qualify for the construction work in progress incentive					$ 190							$ 190