Utility Rate Regulation (Regulatory Matters) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended		12 Months Ended		1 Months Ended	12 Months Ended													1 Months Ended	12 Months Ended
	Dec. 31, 2013 Integer	Dec. 31, 2012	Dec. 31, 2012 PPL Electric [Member]	Dec. 31, 2011 PPL Electric [Member] Pennsylvania 2011 Storms [Member] Integer	Oct. 31, 2012 PPL Electric [Member] Pennsylvania 2012 Storms [Member]	Dec. 31, 2013 PPL Electric [Member] Pennsylvania 2012 Storms [Member]	Dec. 31, 2012 PPL Electric [Member] Pennsylvania 2012 Storms [Member]	Dec. 31, 2012 PPL Electric [Member] Distribution Rates [Member]	Dec. 31, 2012 LGE [Member]	Dec. 31, 2012 LGE [Member] Kentucky August 2011 Storms [Member] Integer	Dec. 31, 2011 LGE [Member] Kentucky August 2011 Storms [Member] Integer	Dec. 31, 2012 LGE [Member] Electric Rates [Member]	Dec. 31, 2012 LGE [Member] Gas Rates [Member]	Dec. 31, 2012 KU [Member]	Dec. 31, 2012 KU [Member] Electric Rates [Member]	Dec. 31, 2013 PPL Electric Utilities Corp [Member] Integer	Dec. 31, 2012 PPL Electric Utilities Corp [Member]	Dec. 31, 2011 PPL Electric Utilities Corp [Member] Pennsylvania 2011 Storms [Member] Integer	Oct. 31, 2012 PPL Electric Utilities Corp [Member] Pennsylvania 2012 Storms [Member]	Dec. 31, 2013 PPL Electric Utilities Corp [Member] Pennsylvania 2012 Storms [Member]	Dec. 31, 2012 PPL Electric Utilities Corp [Member] Pennsylvania 2012 Storms [Member]	Dec. 31, 2012 PPL Electric Utilities Corp [Member] Distribution Rates [Member]	Dec. 31, 2013 LG And E And KU Energy LLC [Member]	Dec. 31, 2012 LG And E And KU Energy LLC [Member] Kentucky August 2011 Storms [Member] Integer	Dec. 31, 2012 LG And E And KU Energy LLC [Member] LGE [Member]	Dec. 31, 2011 LG And E And KU Energy LLC [Member] LGE [Member] Kentucky August 2011 Storms [Member] Integer	Dec. 31, 2012 LG And E And KU Energy LLC [Member] LGE [Member] Electric Rates [Member]	Dec. 31, 2012 LG And E And KU Energy LLC [Member] LGE [Member] Gas Rates [Member]	Dec. 31, 2012 LG And E And KU Energy LLC [Member] KU [Member]	Dec. 31, 2012 LG And E And KU Energy LLC [Member] KU [Member] Electric Rates [Member]	Dec. 31, 2013 Louisville Gas And Electric Co [Member]	Dec. 31, 2012 Louisville Gas And Electric Co [Member]	Dec. 31, 2012 Louisville Gas And Electric Co [Member] Kentucky August 2011 Storms [Member] Integer	Dec. 31, 2011 Louisville Gas And Electric Co [Member] Kentucky August 2011 Storms [Member] Integer	Dec. 31, 2012 Louisville Gas And Electric Co [Member] Electric Rates [Member]	Dec. 31, 2012 Louisville Gas And Electric Co [Member] Gas Rates [Member]	Dec. 31, 2013 Kentucky Utilities Co [Member] Integer	Dec. 31, 2012 Kentucky Utilities Co [Member]	Dec. 31, 2012 Kentucky Utilities Co [Member] Electric Rates [Member]
Regulatory Matters - United Kingdom Activities - Ofgem Review of Line Loss Calculation (Numeric) [Abstract]
Liability at period end regarding line loss incentive/penalty	$ 74	$ 94
WPD's credit to income statement for Distribution Price Control Review 4 liability	79
Charge to income during period for line loss incentive/penalty liability	45
Reduction in liability for line loss liability, in 2013, resulting from refunds included in tariffs and foreign exchange movements	66
Minimum potential loss exposure regarding line loss incentive/penalty	74
Maximum potential loss exposure regarding line loss incentive/penalty	213
Regulatory Matters - Rate Case Proceeding (Numeric) [Abstract]
Return on equity request included in rate case																																					10.70%
Dollar amount of increase to rates								71				34	15		51							71					34	15		51					34	15			51
Reduction in depreciation expense in 2013 as a result of lower weighted-average rates	22																						22								8						14
Return on equity increase resulting from approved increase to rates			10.40%						10.25%					10.25%			10.40%								10.25%				10.25%			10.25%						10.25%
Regulatory Matters - Pennsylvania Activities - Act 129 (Numeric) [Abstract]
Under Act 129, percentage cap on costs that can be recovered for implementation of EE and C plan	2.00%															2.00%
Under Act 129, percentage reduction in electricity consumption by 2011	1.00%															1.00%
Under Act 129, percentage reduction in electricity consumption by 2013	3.00%															3.00%
Under Act 129, percentage reduction in peak demand electricity consumption by 2013	4.50%															4.50%
Number of hours that are the benchmark for demand reductions by 2013	100															100
Number of years EDCs have to comply with consumption reduction target	3															3
Under Act 129, percentage reduction in electricity target for the company under the Phase II program	2.10%															2.10%
Number of modifications filed to Phase II plan	40															40
Minimum term of long term supply contract under Act 129 (in years)	4															4
Maximum term of long term supply contract under Act 129 (in years)	20															20
Maximum percentage of long-term contracts that can be included in the mix of PLR supply contracts under Act 129	25.00%															25.00%
Regulatory Matters - Pennsylvania Activities - Smart Meter Rider (Numeric) [Abstract]
Maximum number of years the cost of smart meters can be depreciated	15															15
Regulatory Matters - Pennsylvania Activities - Public Utility Commission Investigation of Retail Electricity Market (Numeric) [Abstract]
Number of phases of a PUC investigation of retail electricity market	2															2
Regulatory Matters - Pennsylvania Activities - Distribution System Improvement Charge (Numeric) [Abstract]
Number of ratemaking mechanisms authorized for PUC approval	2															2
Minimum term for Long Term Infrastructure Improvement Plan (in years)	5															5
Maximum term for Long Term Infrastructure Improvement Plan (in years)	10															10
Number of issues assigned to the Office of Administrative Law Judge	4															4
Regulatory Matters - Storm Costs (Numeric) [Abstract]
Number of customers impacted by storm											139,000															139,000								139,000
Total storm restoration costs incurred				84	66		81											84	66		81
Storm restoration costs recorded to statement of income				54	50		61											54	50		61
Total probable insurance recoveries recorded				26.50			18.25											26.50			18.25
Total probable insurance recoveries recorded to statement of income				16			14											16			14
Amount of regulatory asset established				$ 25		$ 29	$ 28				$ 8							$ 25		$ 29	$ 28					$ 8								$ 8
Period over which storm costs will be recovered (in years)				5						5								5						5									5
Regulatory Matters - Federal Matters - Federal Energy Regulatory Commission Formula Rates (Numeric) [Abstract]
Number of municipal customers impacted for Federal Energy Regulatory Commission formula rate request																																					12