Derivative Instruments and Hedging Activities (Risk Disclosures) (Details)	9 Months Ended								3 Months Ended	9 Months Ended										1 Months Ended	9 Months Ended					1 Months Ended	9 Months Ended				1 Months Ended
	Sep. 30, 2014 Cash Flow Hedges [Member] USD ($)	Sep. 30, 2014 Cash Flow Hedges [Member] Interest Rate Swap Contracts [Member] USD ($)	Sep. 30, 2014 Cash Flow Hedges [Member] Cross Currency Interest Rate Swaps [Member] USD ($)	Sep. 30, 2014 Economic Hedges [Member] Interest Rate Swap Contracts [Member] USD ($)	Sep. 30, 2014 Economic Hedges [Member] Foreign Currency Contracts [Member] USD ($)	Sep. 30, 2014 Economic Hedges [Member] Foreign Currency Contracts [Member] GBP (£)	Sep. 30, 2014 Net Investment Hedges [Member] Foreign Currency Contracts [Member] USD ($)	Sep. 30, 2014 Net Investment Hedges [Member] Foreign Currency Contracts [Member] GBP (£)	Sep. 30, 2013 Net Investment Hedges [Member] Intercompany Loans [Member] USD ($)	Sep. 30, 2014 Net Investment Hedges [Member] Intercompany Loans [Member]	Sep. 30, 2013 Net Investment Hedges [Member] Intercompany Loans [Member] USD ($)	Sep. 30, 2014 Net Investment Hedges [Member] Combined Foreign Currency Contracts And Intercompany Loans [Member] USD ($)	Sep. 30, 2014 WPD [Member] Net Investment Hedges [Member] Intercompany Loans [Member] USD ($)	Sep. 30, 2014 WPD [Member] Net Investment Hedges [Member] Intercompany Loans [Member] GBP (£)	Sep. 30, 2014 LG And E And KU Energy LLC [Member] USD ($)	Sep. 30, 2013 LG And E And KU Energy LLC [Member] USD ($)	Sep. 30, 2014 LG And E And KU Energy LLC [Member] Interest Rate Swap Contracts [Member] USD ($)	Sep. 30, 2014 LG And E And KU Energy LLC [Member] Cash Flow Hedges [Member] Interest Rate Swap Contracts [Member]	Sep. 30, 2014 LG And E And KU Energy LLC [Member] Economic Hedges [Member] Interest Rate Swap Contracts [Member] USD ($)	Oct. 31, 2014 LG And E And KU Energy LLC [Member] Subsequent Event [Member] Interest Rate Swap Contracts [Member] USD ($)	Sep. 30, 2014 Louisville Gas And Electric Co [Member] USD ($)	Sep. 30, 2013 Louisville Gas And Electric Co [Member] USD ($)	Sep. 30, 2014 Louisville Gas And Electric Co [Member] Interest Rate Swap Contracts [Member] USD ($)	Sep. 30, 2014 Louisville Gas And Electric Co [Member] Cash Flow Hedges [Member] Interest Rate Swap Contracts [Member]	Sep. 30, 2014 Louisville Gas And Electric Co [Member] Economic Hedges [Member] Interest Rate Swap Contracts [Member] USD ($)	Oct. 31, 2014 Louisville Gas And Electric Co [Member] Subsequent Event [Member] Interest Rate Swap Contracts [Member] USD ($)	Sep. 30, 2014 Kentucky Utilities Co [Member] USD ($)	Sep. 30, 2013 Kentucky Utilities Co [Member] USD ($)	Sep. 30, 2014 Kentucky Utilities Co [Member] Interest Rate Swap Contracts [Member] USD ($)	Sep. 30, 2014 Kentucky Utilities Co [Member] Cash Flow Hedges [Member] Interest Rate Swap Contracts [Member]	Oct. 31, 2014 Kentucky Utilities Co [Member] Subsequent Event [Member] Interest Rate Swap Contracts [Member] USD ($)
Interest Rate Risk And Foreign Currency Risk [Line Items]
Notional amount		$ 1,200,000,000	$ 1,300,000,000	$ 179,000,000			$ 494,000,000	£ 306,000,000									$ 650,000,000		$ 179,000,000	$ 350,000,000			$ 325,000,000		$ 179,000,000	$ 175,000,000			$ 325,000,000		$ 175,000,000
Notional amount of nonderivative instruments													56,000,000	34,000,000
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			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 September 30, 2014 and 2013, PPL had no hedge ineffectiveness associated with interest rate derivatives. There were insignificant amounts of hedge ineffectiveness associated with interest rate derivatives for the nine months ended September 30, 2014 and 2013.																	For the three and nine months ended September 30, 2014, there was no hedge ineffectiveness recorded for the interest rate derivatives.						For the three and nine months ended September 30, 2014, there was no hedge ineffectiveness recorded for the interest rate derivatives.						For the three and nine months ended September 30, 2014, there was no hedge ineffectiveness recorded for the interest rate derivatives.
No or insignificant after-tax gains (losses) previously recorded in AOCI reclassified to earnings related to interest rate cash flow hedge contracts	For the nine months ended September 30, 2014, PPL had an insignificant amount reclassified associated with discontinued cash flow hedges. There were no such reclassifications for the three months ended September 30, 2014 and the three and nine months ended September 30, 2013.
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)
Cash settlement on terminated swaps															0	98,000,000					0	49,000,000					0	49,000,000
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							November 2014	November 2014
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									(9,000,000)		(3,000,000)
Insignificant or no net after tax gains (losses) on net investment hedges recognized in the foreign currency translation adjustment component of AOCI										At September 30, 2014, PPL had $4 million of accumulated net investment hedge after tax gains (losses) that were included in the foreign currency translation adjustment component of AOCI, compared to an insignificant amount at December 31, 2013.		For the three and nine months ended September 30, 2014, PPL recognized an insignificant amount of net investment hedge gains (losses) on the intercompany loans in the foreign currency translation adjustment component of OCI.
Net after tax gains (losses) on net investment hedges included in the foreign currency translation adjustment component of AOCI												4,000,000
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Total exposure hedged related to foreign currency contracts for anticipated earnings hedges classified as economic activity					$ 2,600,000,000	£ 1,600,000,000
Earliest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity					October 2014	October 2014
Latest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity					December 2016	December 2016