Utility Rate Regulation (Regulatory Matters) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended						3 Months Ended	12 Months Ended	3 Months Ended		12 Months Ended	3 Months Ended
	Mar. 31, 2014 Integer Y	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 Pennsylvania 2013 Storms [Member]	Mar. 31, 2014 Hurricane Sandy [Member]	Mar. 31, 2014 PPL Electric [Member] Pennsylvania 2013 Storms [Member]	Mar. 31, 2014 PPL Electric [Member] Hurricane Sandy [Member]	Dec. 31, 2013 PPL Electric [Member] Hurricane Sandy [Member]	Mar. 31, 2014 PPL Electric Utilities Corp [Member] Integer Y	Mar. 31, 2014 PPL Electric Utilities Corp [Member] Hurricane Sandy [Member]	Dec. 31, 2013 PPL Electric Utilities Corp [Member] Hurricane Sandy [Member]	Mar. 31, 2014 LG And E And KU Energy LLC [Member] Integer	Mar. 31, 2014 Louisville Gas And Electric Co [Member] Integer	Mar. 31, 2014 Kentucky Utilities Co [Member] Integer
Regulatory Matters - United Kingdom Activities - Ofgem Review of Line Loss Calculation (Numeric) [Abstract]
Charge to income during period for line loss incentive/penalty liability	$ 65
Liability at period end regarding line loss incentive/penalty	115		74
Regulatory Matters - Kentucky Activities - Certificate of Public Convenience and Necessity Filing (Numeric) [Abstract]
Number of days requested to allow for additional proceedings	90											90	90	90
Regulatory Matters - Pennsylvania Activities - Storm Damage Expense Rider (Numeric) [Abstract]
Amount of regulatory liability reversed				12		12
Number of years costs will be recovered							3			3
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 - 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 - Federal Matters - Federal Energy Regulatory Commission Formula Rates (Numeric) [Abstract]
Number of municipal customers impacted for Federal Energy Regulatory Commission formula rate request												12		12
Approved return on equity												10.70%		10.70%
Number of municipalities that submitted termination notices, effective 2019												9		9
Number of municipalities that submitted termination notices, effective 2017												1		1
Regulatory Matters - Storm Costs (Numeric) [Abstract]
Amount of regulatory asset established							$ 29	$ 29		$ 29	$ 29