Acquisitions, Development and Divestures (Details) (USD $)	12 Months Ended				12 Months Ended							1 Months Ended	12 Months Ended			12 Months Ended						1 Months Ended	12 Months Ended				1 Months Ended	12 Months Ended			12 Months Ended							12 Months Ended				12 Months Ended
	Dec. 31, 2013 MW	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Cane Run Unit 7 [Member]	Dec. 31, 2013 Cane Run And Green River Plants [Member] Integer MW	Dec. 31, 2013 Tyrone Plant [Member] MW	Dec. 31, 2013 Haefling Plant [Member] MW	Dec. 31, 2013 Future Capacity [Member] MW	Dec. 31, 2013 Green River Plant [Member] MW	Dec. 31, 2013 Solar Generation Facility [Member] MW	Dec. 31, 2013 Holtwood Hydroelectric Plant Expansion [Member] MW	Jan. 31, 2014 Rainbow Hydroelectric Plant Expansion [Member]	Dec. 31, 2013 Rainbow Hydroelectric Plant Expansion [Member] MW	Dec. 31, 2013 Proposed Bell Bend Nuclear Unit [Member] Integer	Dec. 31, 2012 Proposed Bell Bend Nuclear Unit [Member]	Dec. 31, 2013 Susquehanna Roseland Transmission Line [Member] mi kV	Dec. 31, 2013 Northeast Pocono Reliability Project [Member] mi Integer	Dec. 31, 2013 PPL Energy Supply LLC [Member] MW Integer	Dec. 31, 2012 PPL Energy Supply LLC [Member]	Dec. 31, 2011 PPL Energy Supply LLC [Member]	Dec. 31, 2013 PPL Energy Supply LLC [Member] Holtwood Hydroelectric Plant Expansion [Member] MW	Jan. 31, 2014 PPL Energy Supply LLC [Member] Rainbow Hydroelectric Plant Expansion [Member]	Dec. 31, 2013 PPL Energy Supply LLC [Member] Rainbow Hydroelectric Plant Expansion [Member] MW	Dec. 31, 2013 PPL Energy Supply LLC [Member] Proposed Bell Bend Nuclear Unit [Member] Integer	Dec. 31, 2012 PPL Energy Supply LLC [Member] Proposed Bell Bend Nuclear Unit [Member]	Dec. 31, 2013 PPL Energy Supply LLC [Member] Susquehanna Roseland Transmission Line [Member]	Jan. 31, 2014 PPL Electric Utilities Corp [Member] Rainbow Hydroelectric Plant Expansion [Member]	Dec. 31, 2013 PPL Electric Utilities Corp [Member] Susquehanna Roseland Transmission Line [Member] mi kV	Dec. 31, 2013 PPL Electric Utilities Corp [Member] Northeast Pocono Reliability Project [Member] Integer mi	Dec. 31, 2013 LG And E And KU Energy LLC [Member] Cane Run Unit 7 [Member]	Dec. 31, 2013 LG And E And KU Energy LLC [Member] Cane Run And Green River Plants [Member] MW Integer	Dec. 31, 2013 LG And E And KU Energy LLC [Member] Tyrone Plant [Member] MW	Dec. 31, 2013 LG And E And KU Energy LLC [Member] Haefling Plant [Member] MW	Dec. 31, 2013 LG And E And KU Energy LLC [Member] Future Capacity [Member] MW	Dec. 31, 2013 LG And E And KU Energy LLC [Member] Green River Plant [Member] MW	Dec. 31, 2013 LG And E And KU Energy LLC [Member] Solar Generation Facility [Member] MW	Dec. 31, 2013 Louisville Gas And Electric Co [Member] Cane Run Unit 7 [Member]	Dec. 31, 2013 Louisville Gas And Electric Co [Member] Cane Run And Green River Plants [Member] Integer MW	Dec. 31, 2013 Louisville Gas And Electric Co [Member] Green River Plant [Member] MW	Dec. 31, 2013 Louisville Gas And Electric Co [Member] Solar Generation Facility [Member] MW	Dec. 31, 2013 Kentucky Utilities Co [Member] Cane Run Unit 7 [Member]	Dec. 31, 2013 Kentucky Utilities Co [Member] Cane Run And Green River Plants [Member] MW Integer	Dec. 31, 2013 Kentucky Utilities Co [Member] Tyrone Plant [Member] MW	Dec. 31, 2013 Kentucky Utilities Co [Member] Haefling Plant [Member] MW	Dec. 31, 2013 Kentucky Utilities Co [Member] Green River Plant [Member] MW	Dec. 31, 2013 Kentucky Utilities Co [Member] Solar Generation Facility [Member] MW
Development Projects [Abstract]
Planned capacity expansion (in MW)								700	700	10																								700	700	10			700	10					700	10
Completed capacity expansion (in MW)											125		63								125		63
Expected capital cost of an expansion project				$ 600,000,000					$ 700,000,000	$ 36,000,000							$ 335,000,000												$ 335,000,000	$ 600,000,000					$ 700,000,000	$ 36,000,000	$ 600,000,000		$ 700,000,000	$ 36,000,000	$ 600,000,000				$ 700,000,000	$ 36,000,000
Ownership percentage in a jointly owned plant																																					22.00%		40.00%	36.00%	78.00%				60.00%	64.00%
Number of plants anticipated to retire based on stricter EPA regulations or new construction					5																										5							5				5
Capacity of plants anticipated to be retired (in MW)					724																										724							724				724
Capacity of plants retired (in MW)						71	12																									71	12										71	12
Cumulative deferred investments tax credits recorded	60,000,000										117,000,000		60,000,000								117,000,000		60,000,000
Treasury grants approved, accepted and to be received in lieu of tax credits												56,000,000										56,000,000
Cumulative deferred investments tax credits to be recaptured												60,000,000															60,000,000
Number of applicants still active in DOE nuclear guarantee program														8										8
Number of applicants that submitted loan guarantees to the DOE														10										10
Current appropriated federal loan guarantees for nuclear projects														18,500,000,000										18,500,000,000
Maximum number of projects the DOE is expected to finance														3										3
Amount currently authorized by Board of Directors to spend on Bell Bend COLA														224,000,000										224,000,000
Capitalized costs associated with licensing efforts														173,000,000	154,000,000									173,000,000	154,000,000
Total length (in miles) of the expansion project																150	58											150	58
Capacity (in kilovolts) of a transmission line																500	230											500	230
Share of the expected capital cost of an expansion project when the company has a joint ownership interest																630,000,000												630,000,000
Project costs capitalized																377,000,000										377,000,000
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
Zoning petitions to be approved																	2												2
Other - Montana Transactions (Numeric) [Line Items]
Capacity of facilities to be sold (in MW)	633																	633
Agreed upon sales price for disposal of hydroelectric facilities owned by PPL Montana	900,000,000																	900,000,000
Number of hydroelectric facilities owned by PPL Montana to be sold	11																	11
Loss on lease termination	(697,000,000)																	(697,000,000)
Loss on sale-leaseback termination, after-tax	413,000,000																	413,000,000
Payment on lease termination	$ 271,000,000																	$ 271,000,000