Derivative Instruments and Hedging Activities (Risk Disclosures) (Details)	3 Months Ended									12 Months Ended	3 Months Ended
	Mar. 31, 2015 Cash Flow Hedges [Member] USD ($)	Mar. 31, 2015 Cash Flow Hedges [Member] Interest Rate Swap Contracts [Member] USD ($)	Mar. 31, 2015 Cash Flow Hedges [Member] Cross Currency Interest Rate Swaps [Member] USD ($)	Mar. 31, 2015 Economic Hedges [Member] Interest Rate Swap Contracts [Member] USD ($)	Mar. 31, 2015 Economic Hedges [Member] Foreign Currency Contracts [Member] USD ($)	Mar. 31, 2015 Economic Hedges [Member] Foreign Currency Contracts [Member] GBP (£)	Mar. 31, 2015 Net Investment Hedges [Member] Foreign Currency Contracts [Member] USD ($)	Mar. 31, 2015 Net Investment Hedges [Member] Foreign Currency Contracts [Member] GBP (£)	Mar. 31, 2015 Net Investment Hedges [Member] Combined Foreign Currency Contracts And Intercompany Loans [Member] USD ($)	Dec. 31, 2014 Net Investment Hedges [Member] Combined Foreign Currency Contracts And Intercompany Loans [Member] USD ($)	Mar. 31, 2015 LG And E And KU Energy LLC [Member] Interest Rate Swap Contracts [Member] USD ($)	Mar. 31, 2015 LG And E And KU Energy LLC [Member] Economic Hedges [Member] Interest Rate Swap Contracts [Member] USD ($)	Mar. 31, 2015 Louisville Gas And Electric Co [Member] Interest Rate Swap Contracts [Member] USD ($)	Mar. 31, 2015 Louisville Gas And Electric Co [Member] Economic Hedges [Member] Interest Rate Swap Contracts [Member] USD ($)	Mar. 31, 2015 Kentucky Utilities Co [Member] Interest Rate Swap Contracts [Member] USD ($)
Interest Rate Risk And Foreign Currency Risk [Line Items]
Notional amount		$ 1,600,000,000	$ 1,300,000,000	$ 179,000,000			$ 355,000,000	£ 217,000,000			$ 1,000,000,000	$ 179,000,000	$ 500,000,000	$ 179,000,000	$ 500,000,000
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]
Year of expiration of the maximum maturity date of interest rate cash flow hedge contracts		2045									2045		2045		2045
Latest maturity date of cross-currency cash flow hedge contracts			2028
Insignificant or no hedge ineffectiveness associated with interest rate cash flow hedges	For the three months ended March 31, 2015, PPL had no hedge ineffectiveness associated with interest rate derivatives and an insignificant amount for the three months ended March 31, 2014.
No or insignificant after-tax gains (losses) previously recorded in AOCI reclassified to earnings related to interest rate cash flow hedge contracts	PPL had no such reclassifications for the three months ended March 31, 2015 associated with discontinued cash flow hedges and an insignificant amount reclassified for the three months ended March 31, 2014.
Net unrealized after-tax gains (losses) on interest rate cash flow hedge contracts expected to be reclassified into earnings during next 12 months	(13,000,000)
Interest Rate Risk - Economic Activity (Numeric) [Abstract]
Year of expiration of the maximum maturity date of interest rate economic activity contracts				2033								2033		2033
Foreign Currency Risk - Net Investment Hedges (Numeric) [Abstract]
Earliest settlement date of net investment hedge contracts							May 2015	May 2015
Latest settlement date of net investment hedge contracts							June 2016	June 2016
Net after tax gains (losses) on net investment hedges recognized in the foreign currency translation adjustment component of AOCI									24,000,000	14,000,000
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Total exposure hedged related to foreign currency contracts for anticipated earnings hedges classified as economic activity					$ 2,100,000,000	£ 1,300,000,000
Earliest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity					April 2015	April 2015
Latest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity					March 2017	March 2017