Commitments and Contingencies (Environmental Matter and Other) (Details) (USD $)	9 Months Ended		3 Months Ended	6 Months Ended	9 Months Ended				3 Months Ended	9 Months Ended		3 Months Ended	6 Months Ended	9 Months Ended				3 Months Ended	9 Months Ended		3 Months Ended	6 Months Ended	9 Months Ended			1 Months Ended	9 Months Ended			1 Months Ended	9 Months Ended		9 Months Ended
	Sep. 30, 2014 Integer	Dec. 31, 2013	Sep. 30, 2014 International Brotherhood Of Electrical Workers Local 1600 [Member]	Jun. 30, 2014 International Brotherhood Of Electrical Workers Local 1600 [Member]	Sep. 30, 2014 International Brotherhood Of Electrical Workers Local 1600 [Member] Integer	Sep. 30, 2014 Brunner Island And Montour Plants [Member]	Sep. 30, 2014 Brunner Island Plant [Member]	Sep. 30, 2014 Montour Plant [Member]	Sep. 30, 2014 PPL Energy Supply LLC [Member]	Sep. 30, 2014 PPL Energy Supply LLC [Member] Integer	Dec. 31, 2013 PPL Energy Supply LLC [Member]	Sep. 30, 2014 PPL Energy Supply LLC [Member] International Brotherhood Of Electrical Workers Local 1600 [Member]	Jun. 30, 2014 PPL Energy Supply LLC [Member] International Brotherhood Of Electrical Workers Local 1600 [Member]	Sep. 30, 2014 PPL Energy Supply LLC [Member] International Brotherhood Of Electrical Workers Local 1600 [Member] Integer	Sep. 30, 2014 PPL Energy Supply LLC [Member] Brunner Island And Montour Plants [Member]	Sep. 30, 2014 PPL Energy Supply LLC [Member] Brunner Island Plant [Member]	Sep. 30, 2014 PPL Energy Supply LLC [Member] Montour Plant [Member]	Sep. 30, 2014 PPL Electric Utilities Corp [Member]	Sep. 30, 2014 PPL Electric Utilities Corp [Member]	Dec. 31, 2013 PPL Electric Utilities Corp [Member]	Sep. 30, 2014 PPL Electric Utilities Corp [Member] International Brotherhood Of Electrical Workers Local 1600 [Member]	Jun. 30, 2014 PPL Electric Utilities Corp [Member] International Brotherhood Of Electrical Workers Local 1600 [Member]	Sep. 30, 2014 PPL Electric Utilities Corp [Member] International Brotherhood Of Electrical Workers Local 1600 [Member] Integer	Sep. 30, 2014 LG And E And KU Energy LLC [Member] Integer	Dec. 31, 2013 LG And E And KU Energy LLC [Member]	Nov. 30, 2014 LG And E And KU Energy LLC [Member] LGE [Member] Subsequent Event [Member] International Brotherhood Of Electrical Workers Local 2100 [Member] Integer	Sep. 30, 2014 LG And E And KU Energy LLC [Member] KU [Member] United Steelworkers Of America [Member] Integer	Sep. 30, 2014 Louisville Gas And Electric Co [Member] Integer	Dec. 31, 2013 Louisville Gas And Electric Co [Member]	Nov. 30, 2014 Louisville Gas And Electric Co [Member] Subsequent Event [Member] International Brotherhood Of Electrical Workers Local 2100 [Member] Integer	Sep. 30, 2014 Kentucky Utilities Co [Member] Integer	Dec. 31, 2013 Kentucky Utilities Co [Member]	Sep. 30, 2014 Kentucky Utilities Co [Member] United Steelworkers Of America [Member] Integer
Environmental Matters - Domestic - Air - Cross State Air Pollution Rule (formerly Clean Air Transport Rule) and Clean Air Interstate Rule (Numeric) [Abstract]
Number of phases CSAPR will be implemented	2									2														2				2			2
Environmental Matters - Domestic - Air - Mercury and Air Toxics (Numeric) [Abstract]
Number of states requesting Supreme Court review	23									23														23				23			23
Period for compliance with final mercury and air toxics standards (in years)	3									3														3				3			3
Possible period of extension to comply with final mercury and air toxics standards (in years)	1									1														1				1			1
Environmental Matters - Domestic - Air - Climate Change (Numeric) [Abstract]
Percentage reduction of greenhouse gas emissions below 2005 levels by 2020	17.00%									17.00%									17.00%					17.00%				17.00%			17.00%
Estimate of "social cost of carbon" per metric ton prior to 2015	$ 23.8									$ 23.8									$ 23.8					$ 23.8				$ 23.8			$ 23.8
Estimate of "social cost of carbon" per metric ton in 2015	$ 38									$ 38									$ 38					$ 38				$ 38			$ 38
Number of electric utility companies affected by a September 2009 U.S. Court of Appeals for the Second Circuit decision	5									5														5				5			5
Number of companies cited in May 2011 Mississippi court filing	87									87														87				87			87
Number of indirect subsidaries cited in a May 2011 Mississippi court filing	3																							3							3
Environmental Matters - Domestic - Air - Renewable Energy Legislation (Numeric) [Abstract]
Proposed percentage of New Jersey renewable energy portfolio standard by 2020	30.00%									30.00%
Proposed amount of funding for solar projects	$ 25,000,000								$ 25,000,000	$ 25,000,000								$ 25,000,000	$ 25,000,000
Environmental Matters - Domestic - Water/Waste - Coal Combustion Residuals (Numeric) [Abstract]
Number of approaches proposed by EPA in June 2010 to regulate CCRs	2									2														2				2			2
Number of companies that have issued an intent to sue against the EPA regarding CCRs	2									2
Environmental Matters - Domestic - Water/Waste - Seepages and Groundwater Infiltration - Pennsylvania, Montana and Kentucky (Numeric) [Abstract]
Period for PPL Montana to provide financial assurance to Montana Department of Environmental Quality (in years)	5									5
Other - Nuclear Insurance (Numeric) [Abstract]
Maximum amount of insured property damage losses at nuclear station	2,000,000,000								2,000,000,000	2,000,000,000
Maximum assessment for retroactive premiums for nuclear outage insurance coverage	46,000,000								46,000,000	46,000,000
Maximum public liability for claims resulting an incident at nuclear station	13,600,000,000								13,600,000,000	13,600,000,000
Maximum amount that could be assessed resulting from an incident at nuclear station	255,000,000								255,000,000	255,000,000
Maximum amount payable per year resulting from an incident at nuclear station	38,000,000								38,000,000	38,000,000
Other - Pennsylvania Coal Plants (Numeric) [Abstract]
Carrying value of utility plants	34,397,000,000	33,087,000,000				2,500,000,000	1,300,000,000	1,200,000,000	6,359,000,000	6,359,000,000	7,174,000,000				2,500,000,000	1,300,000,000	1,200,000,000	5,622,000,000	5,622,000,000	5,062,000,000				10,219,000,000	9,544,000,000			4,089,000,000	3,702,000,000		6,124,000,000	5,837,000,000
Other - Labor Union Agreements (Details) [Line Items]
Term, in years, of newly approved labor agreement																										3	3			3			3
Pension benefits recorded related to voluntary retirement election					13,000,000				(5,000,000)	11,000,000				11,000,000				(2,000,000)	2,000,000				2,000,000
Severance compensation recorded related to voluntary retirement election					7,000,000									6,000,000									1,000,000
Total seperation benefits recorded related to voluntary retirement election			$ (9,000,000)	$ 29,000,000	$ 20,000,000							$ (6,000,000)	$ 23,000,000	$ 17,000,000							$ (3,000,000)	$ 6,000,000	$ 3,000,000
Number of employees who elected voluntary retirement					121									105									15
Percentage of wage increase for union employees																										2.50%	2.50%			2.50%			2.50%
Number of employees represented by an union																										700	74			700			74