Acquisitions, Development and Divestures (Details) (USD $)	3 Months Ended		6 Months Ended			6 Months Ended		1 Months Ended	6 Months Ended			1 Months Ended	6 Months Ended					6 Months Ended				6 Months Ended				6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2014 Integer	Jun. 30, 2013	Jun. 30, 2014 Integer MW	Jun. 30, 2013	Jun. 30, 2014 Green River Plant [Member] MW	Jun. 30, 2014 Solar Generation Facility [Member] MW	Jun. 30, 2014 Rainbow Hydroelectric Plant Expansion [Member]	Jul. 31, 2014 Holtwood Hydroelectric Plant Expansion [Member]	Jun. 30, 2014 PPL Energy Supply LLC [Member] MW Integer	Jun. 30, 2013 PPL Energy Supply LLC [Member]	Jun. 30, 2014 PPL Energy Supply LLC [Member] Rainbow Hydroelectric Plant Expansion [Member]	Jul. 31, 2014 PPL Energy Supply LLC [Member] Holtwood Hydroelectric Plant Expansion [Member]	Jun. 30, 2014 PPL Electric Utilities Corp [Member]	Jun. 30, 2013 PPL Electric Utilities Corp [Member]	Jun. 30, 2014 LG And E And KU Energy LLC [Member] Integer	Jun. 30, 2013 LG And E And KU Energy LLC [Member]	Jun. 30, 2014 LG And E And KU Energy LLC [Member] Green River Plant [Member] MW	Jun. 30, 2014 LG And E And KU Energy LLC [Member] Solar Generation Facility [Member] MW	Jun. 30, 2014 Louisville Gas And Electric Co [Member] Integer	Jun. 30, 2013 Louisville Gas And Electric Co [Member]	Jun. 30, 2014 Louisville Gas And Electric Co [Member] Green River Plant [Member] MW	Jun. 30, 2014 Louisville Gas And Electric Co [Member] Solar Generation Facility [Member] MW	Jun. 30, 2014 Kentucky Utilities Co [Member] Integer	Jun. 30, 2013 Kentucky Utilities Co [Member]	Jun. 30, 2014 Kentucky Utilities Co [Member] Green River Plant [Member] MW	Jun. 30, 2014 Kentucky Utilities Co [Member] Solar Generation Facility [Member] MW	Jun. 30, 2014 Spinoff [Member]	Jun. 30, 2014 Spinoff [Member]	Jun. 30, 2014 Spinoff [Member] PPL Energy Supply LLC [Member]
Divestitures - Anticipated Spinoff of PPL Energy Supply (Numeric) [Abstract]
Spinoff agreement execution date																												Jun. 09, 2014	Jun. 09, 2014
Certain details of spinoff transaction																												PPL and PPL Energy Supply executed definitive agreements with affiliates of Riverstone to combine their competitive power generation businesses into a new, stand-alone, publicly traded, independent power producer named Talen Energy. Under the terms of the agreements, at closing, PPL will spin off PPL Energy Supply to PPL shareowners and simultaneously combine that business with RJS Power. In June 2014, PPL and PPL Energy Supply executed definitive agreements with affiliates of Riverstone to combine their competitive power generation businesses into a new, stand-alone, publicly traded, independent power producer named Talen Energy. Under the terms of the agreements, at closing, PPL will spin off PPL Energy Supply to PPL shareowners and simultaneously combine that business with RJS Power.	PPL and PPL Energy Supply executed definitive agreements with affiliates of Riverstone to combine their competitive power generation businesses into a new, stand-alone, publicly traded, independent power producer named Talen Energy. Under the terms of the agreements, at closing, PPL will spin off PPL Energy Supply to PPL shareowners and simultaneously combine that business with RJS Power. In June 2014, PPL and PPL Energy Supply executed definitive agreements with affiliates of Riverstone to combine their competitive power generation businesses into a new, stand-alone, publicly traded, independent power producer named Talen Energy. Under the terms of the agreements, at closing, PPL will spin off PPL Energy Supply to PPL shareowners and simultaneously combine that business with RJS Power.
Initial percent ownership in new company, Talen Energy, by PPL shareowners																												65.00%	65.00%
Initial percent ownership in new company, Talen Energy, by Riverstone Holdings, LLC																												35.00%	35.00%
Minimum capacity of revolving credit facility for Talen required at closing under agreement terms																												$ 1,000,000,000	$ 1,000,000,000
Spinoff expected completion date																												Expected to close in first or second quarter of 2015	Expected to close in first or second quarter of 2015
Deferred income tax recorded as result of agreement to adjust valuation allowances			133,000,000	291,000,000					(120,000,000)	98,000,000			44,000,000	81,000,000	149,000,000	95,000,000			20,000,000	21,000,000			89,000,000	72,000,000			46,000,000	46,000,000
Spinoff transaction costs	16,000,000		16,000,000																								16,000,000	16,000,000
Spinoff anticipated transaction costs in future periods																											26,000,000	26,000,000
Development Projects [Abstract]
Planned capacity expansion (in MW)						10												10				10				10
Completed capacity expansion (in MW)					700												700				700				700
Expected capital cost of an expansion project					700,000,000	36,000,000											700,000,000	36,000,000			700,000,000	36,000,000			700,000,000	36,000,000
Treasury grants approved, accepted and to be received in lieu of tax credits							56,000,000	108,000,000			56,000,000	108,000,000
Cumulative deferred investments tax credits to be recaptured							60,000,000	117,000,000			60,000,000	117,000,000
Number of days requested to allow for additional proceedings			90												90				90				90
Divestitures - Montana Hydro Sale Agreement (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						11