Financing Activities (Credit Arrangements) (Details)	12 Months Ended		12 Months Ended				12 Months Ended		12 Months Ended				12 Months Ended								12 Months Ended				12 Months Ended						12 Months Ended				12 Months Ended						12 Months Ended				12 Months Ended																																	12 Months Ended								12 Months Ended				12 Months Ended						12 Months Ended				12 Months Ended							12 Months Ended				12 Months Ended				12 Months Ended						12 Months Ended				12 Months Ended
	Dec. 31, 2014 WPD Limited [Member] Syndicated Credit Facility [Member] USD ($)	Dec. 31, 2013 WPD Limited [Member] Syndicated Credit Facility [Member] USD ($)	Dec. 31, 2014 WPD South West [Member] Syndicated Credit Facility [Member]	Dec. 31, 2014 WPD East Midlands [Member] Syndicated Credit Facility [Member] USD ($)	Dec. 31, 2014 WPD West Midlands [Member] Syndicated Credit Facility [Member]	Dec. 31, 2014 WPD [Member] USD ($)	Dec. 31, 2014 PPL Capital Funding [Member] Syndicated Credit Facility [Member] USD ($)	Dec. 31, 2013 PPL Capital Funding [Member] Syndicated Credit Facility [Member]	Dec. 31, 2014 PPL Capital Funding [Member] Syndicated Credit Facility [Member]	Dec. 31, 2014 PPL Capital Funding [Member] Bilateral Credit Facility [Member]	Dec. 31, 2014 PPL Energy Supply [Member] USD ($)	Dec. 31, 2013 PPL Energy Supply [Member] USD ($)	Dec. 31, 2014 PPL Energy Supply [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2013 PPL Energy Supply [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2014 PPL Energy Supply [Member] Uncommitted Credit Facilities [Member] USD ($)		Dec. 31, 2013 PPL Energy Supply [Member] Uncommitted Credit Facilities [Member] USD ($)		Dec. 31, 2014 PPL Energy Supply [Member] Letter Of Credit Facility [Member] USD ($)		Dec. 31, 2013 PPL Energy Supply [Member] Letter Of Credit Facility [Member] USD ($)		Dec. 31, 2014 PPL Energy Supply [Member] Facility Agreement [Member] USD ($)	Dec. 31, 2014 PPL Energy Supply [Member] Secured Trading Facility [Member] USD ($) Integer	Dec. 31, 2014 PPL Electric [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2013 PPL Electric [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2014 LKE [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2013 LKE [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2014 LGE [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2013 LGE [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2014 KU [Member] USD ($)	Dec. 31, 2013 KU [Member] USD ($)	Dec. 31, 2014 KU [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2013 KU [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2014 KU [Member] Letter Of Credit Facility [Member] USD ($)		Dec. 31, 2013 KU [Member] Letter Of Credit Facility [Member] USD ($)		Dec. 31, 2014 United States of America, Dollars [Member] PPL Capital Funding [Member] USD ($)	Dec. 31, 2013 United States of America, Dollars [Member] PPL Capital Funding [Member] USD ($)	Dec. 31, 2014 United States of America, Dollars [Member] PPL Capital Funding [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2014 United States of America, Dollars [Member] PPL Capital Funding [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2013 United States of America, Dollars [Member] PPL Capital Funding [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2014 United States of America, Dollars [Member] PPL Capital Funding [Member] Bilateral Credit Facility [Member] USD ($)		Dec. 31, 2014 United States of America, Dollars [Member] PPL Capital Funding [Member] Uncommitted Credit Facilities [Member] USD ($)	Dec. 31, 2014 United Kingdom, Pounds [Member] GBP (£)		Dec. 31, 2013 United Kingdom, Pounds [Member] GBP (£)		Dec. 31, 2014 United Kingdom, Pounds [Member] WPD Limited [Member] Syndicated Credit Facility [Member] GBP (£)		Dec. 31, 2013 United Kingdom, Pounds [Member] WPD Limited [Member] Syndicated Credit Facility [Member] GBP (£)		Dec. 31, 2014 United Kingdom, Pounds [Member] WPD South West [Member] Syndicated Credit Facility [Member] GBP (£)		Dec. 31, 2014 United Kingdom, Pounds [Member] WPD East Midlands [Member] Syndicated Credit Facility [Member] GBP (£)		Dec. 31, 2014 United Kingdom, Pounds [Member] WPD West Midlands [Member] Syndicated Credit Facility [Member] GBP (£)		Dec. 31, 2014 United Kingdom, Pounds [Member] WPD [Member] Uncommitted Credit Facilities [Member] GBP (£)	Dec. 31, 2013 United Kingdom, Pounds [Member] WPD [Member] Uncommitted Credit Facilities [Member] GBP (£)	Dec. 31, 2014 PPL Energy Supply LLC [Member] USD ($)	Dec. 31, 2013 PPL Energy Supply LLC [Member] USD ($)	Dec. 31, 2014 PPL Energy Supply LLC [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2013 PPL Energy Supply LLC [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2014 PPL Energy Supply LLC [Member] Uncommitted Credit Facilities [Member] USD ($)		Dec. 31, 2013 PPL Energy Supply LLC [Member] Uncommitted Credit Facilities [Member] USD ($)		Dec. 31, 2014 PPL Energy Supply LLC [Member] Letter Of Credit Facility [Member] USD ($)		Dec. 31, 2013 PPL Energy Supply LLC [Member] Letter Of Credit Facility [Member] USD ($)		Dec. 31, 2014 PPL Energy Supply LLC [Member] Facility Agreement [Member] USD ($)	Dec. 31, 2014 PPL Energy Supply LLC [Member] Secured Trading Facility [Member] USD ($) Integer	Dec. 31, 2014 PPL Electric Utilities Corp [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2013 PPL Electric Utilities Corp [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2014 LG And E And KU Energy LLC [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2013 LG And E And KU Energy LLC [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2014 LG And E And KU Energy LLC [Member] LKE [Member] Syndicated Credit Facility [Member]	Dec. 31, 2014 LG And E And KU Energy LLC [Member] LGE [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2013 LG And E And KU Energy LLC [Member] LGE [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2014 LG And E And KU Energy LLC [Member] KU [Member] USD ($)	Dec. 31, 2013 LG And E And KU Energy LLC [Member] KU [Member] USD ($)	Dec. 31, 2014 LG And E And KU Energy LLC [Member] KU [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2013 LG And E And KU Energy LLC [Member] KU [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2014 LG And E And KU Energy LLC [Member] KU [Member] Letter Of Credit Facility [Member] USD ($)		Dec. 31, 2013 LG And E And KU Energy LLC [Member] KU [Member] Letter Of Credit Facility [Member] USD ($)		Dec. 31, 2014 Louisville Gas And Electric Co [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2013 Louisville Gas And Electric Co [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2014 Kentucky Utilities Co [Member] USD ($)	Dec. 31, 2013 Kentucky Utilities Co [Member] USD ($)	Dec. 31, 2014 Kentucky Utilities Co [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2013 Kentucky Utilities Co [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2014 Kentucky Utilities Co [Member] Letter Of Credit Facility [Member] USD ($)		Dec. 31, 2013 Kentucky Utilities Co [Member] Letter Of Credit Facility [Member] USD ($)
Financing Activities [Line Items]
Expiration date	Dec. 01, 2016		Jul. 01, 2019	Jul. 01, 2019	Jul. 01, 2019		Jul. 28, 2019		Nov. 12, 2018	Mar. 26, 2015			Nov. 06, 2017								Mar. 19, 2015				Jun. 30, 2017	Nov. 03, 2019	Jul. 28, 2019				Oct. 30, 2018				Jul. 29, 2019						Jul. 29, 2019				Oct. 01, 2017																																	Nov. 06, 2017								Mar. 19, 2015				Jun. 30, 2017	Nov. 03, 2019	Jul. 28, 2019				Oct. 30, 2018				Oct. 30, 2018	Jul. 29, 2019						Jul. 29, 2019				Oct. 01, 2017				Jul. 29, 2019						Jul. 29, 2019				Oct. 01, 2017
Capacity											$ 3,250,000,000		$ 3,000,000,000	[1],[2],[3]			$ 100,000,000	[2]			$ 150,000,000	[2]					$ 300,000,000	[1],[2]			$ 75,000,000	[1],[2],[3]			$ 500,000,000	[1],[2]			$ 598,000,000		$ 400,000,000	[1],[2]			$ 198,000,000	[1],[2],[4]			$ 815,000,000		$ 300,000,000	[1],[2],[3]	$ 300,000,000	[1],[2]			$ 150,000,000	[1],[2]	$ 65,000,000	£ 1,160,000,000	[5]			£ 210,000,000	[1],[6]			£ 245,000,000	[1],[6]	£ 300,000,000	[1],[6]	£ 300,000,000	[1],[6]	£ 105,000,000		$ 3,250,000,000		$ 3,000,000,000	[1],[2],[3]			$ 100,000,000	[2]			$ 150,000,000	[2]					$ 300,000,000	[1],[2]			$ 75,000,000	[1],[2],[3]				$ 500,000,000	[1],[2]			$ 598,000,000		$ 400,000,000	[1],[2]			$ 198,000,000	[1],[2],[4]			$ 500,000,000	[1],[2]			$ 598,000,000		$ 400,000,000	[1],[2]			$ 198,000,000	[1],[2],[4]
Borrowed	161,000,000	166,000,000		100,000,000							630,000,000		630,000,000	[1],[2],[3]																	75,000,000	[1],[2],[3]	75,000,000	[1],[2],[3]																270,000,000					270,000,000	[1],[2],[3]				167,000,000	[5]	103,000,000	[5]	103,000,000	[1],[6]	103,000,000	[1],[6]			64,000,000	[1],[6]					630,000,000		630,000,000	[1],[2],[3]																	75,000,000	[1],[2],[3]	75,000,000	[1],[2],[3]
Letters of credit and commercial paper issued											281,000,000	244,000,000	121,000,000	[1],[2],[3]	29,000,000	[1],[2]	22,000,000	[2]	77,000,000	[2]	138,000,000	[2]	138,000,000	[2]			1,000,000	[1],[2]	21,000,000	[1],[2]					264,000,000	[1],[2]	20,000,000	[1],[2]	434,000,000	348,000,000	236,000,000	[1],[2]	150,000,000	[1],[2]	198,000,000	[1],[2],[4]	198,000,000	[1],[2],[4]	22,000,000								21,000,000	[1],[2]	1,000,000	5,000,000	[5]	5,000,000	[5]											5,000,000	5,000,000	281,000,000	244,000,000	121,000,000	[1],[2],[3]	29,000,000	[1],[2]	22,000,000	[2]	77,000,000	[2]	138,000,000	[2]	138,000,000	[2]			1,000,000	[1],[2]	21,000,000	[1],[2]						264,000,000	[1],[2]	20,000,000	[1],[2]	434,000,000	348,000,000	236,000,000	[1],[2]	150,000,000	[1],[2]	198,000,000	[1],[2],[4]	198,000,000	[1],[2],[4]	264,000,000	[1],[2]	20,000,000	[1],[2]	434,000,000	348,000,000	236,000,000	[1],[2]	150,000,000	[1],[2]	198,000,000	[1],[2],[4]	198,000,000	[1],[2],[4]
Unused capacity						1,500,000,000					2,339,000,000		2,249,000,000	[1],[2],[3]			78,000,000	[2]			12,000,000	[2]					299,000,000	[1],[2]							236,000,000	[1],[2]			164,000,000		164,000,000	[1],[2]			0				793,000,000		300,000,000	[1],[2],[3]	300,000,000	[1],[2]			129,000,000	[1],[2]	64,000,000	988,000,000	[5]			107,000,000	[1],[6]			245,000,000	[1],[6]	236,000,000	[1],[6]	300,000,000	[1],[6]	100,000,000		2,339,000,000		2,249,000,000	[1],[2],[3]			78,000,000	[2]			12,000,000	[2]					299,000,000	[1],[2]								236,000,000	[1],[2]			164,000,000		164,000,000	[1],[2]			0				236,000,000	[1],[2]			164,000,000		164,000,000	[1],[2]			0
Minimum interest coverage ratio allowed under the credit facility	3.0 times		3.0 times	3.0 times	3.0 times
Maximum percentage of total net debt to RAV allowed under the credit facility	85.00%		85.00%	85.00%	85.00%
Interest rate on outstanding borrowing	1.86%	1.87%		1.00%				1.79%					2.05%																		1.67%		1.67%																																													2.05%																		1.67%		1.67%
Maximum percentage of debt to total capitalization allowed under the credit facility													65.00%				65.00%				65.00%						70.00%				70.00%				70.00%						70.00%				70.00%																																	65.00%				65.00%				65.00%						70.00%				70.00%					70.00%						70.00%				70.00%				70.00%						70.00%				70.00%
Potential capacity increase							30,000,000						500,000,000														100,000,000				25,000,000										100,000,000																																					500,000,000														100,000,000				25,000,000											100,000,000														100,000,000
Potential maximum Facility Agreement capacity																									500,000,000																																																																	500,000,000
Secured energy marketing and trading facility capacity																										800,000,000																																																																	800,000,000
Aggregate carrying value of mortgages																										2,600,000,000																																																																	2,600,000,000
Automatic renewal term (in years)																										1																																																																	1
Secured obligations outstanding																										$ 64,000,000																																																																	$ 64,000,000

[1] Each company pays customary fees under its respective facility and borrowings generally bear interest at LIBOR-based rates plus an applicable margin.

[2] The facilities contain a financial covenant requiring debt to total capitalization not to exceed 65% for PPL Energy Supply and 70% for PPL Capital Funding, PPL Electric, LKE, LG&E and KU, as calculated in accordance with the facilities and other customary covenants. Additionally, as it relates to the syndicated and bilateral credit facilities and subject to certain conditions, PPL Capital Funding may request that the capacity of its facility expiring in July 2019 be increased by up to $100 million and the facilities expiring in November 2018 and March 2015 may be increased by up to $30 million, PPL Energy Supply may request that its facility's capacity be increased by up to $500 million, PPL Electric and KU each may request up to a $100 million increase in its facility's capacity and LKE may request up to a $25 million increase in its facility's capacity.

[3] At December 31, 2014, PPL Energy Supply’s andLKE's interest rates on outstanding borrowings were 2.05% and 1.67%, respectively. At December 31, 2013, PPL Capital Funding's and LKE’s interest rates on outstanding borrowings were 1.79% and 1.67%, respectively.

[4] KU's letter of credit facility agreement allows for certain payments under the letter of credit facility to be converted to loans rather than requiring immediate payment.

[5] WPD Ltd.'s amounts borrowed at December 31, 2014 and 2013 were USD-denominated borrowings of $161 million and $166 million, which bore interest at 1.86% and 1.87%. WPD (East Midlands) amount borrowed at December 31, 2014 was a GBP-denominated borrowing which equated to $100 million and bore interest at 1.00%. At December 31, 2014, the unused capacity under the U.K. credit facilities was approximately $1.5 billion.

[6] The facilities contain financial covenants to maintain an interest coverage ratio of not less than 3.0 times consolidated earnings before income taxes, depreciation and amortization and total net debt not in excess of 85% of its RAV, calculated in accordance with the credit facility.