Financing Activities (Credit Arrangements) (Details) £ in Millions, $ in Millions		6 Months Ended
		Jun. 30, 2015 GBP (£)		Jun. 30, 2015 USD ($)	Dec. 31, 2014 GBP (£)		Dec. 31, 2014 USD ($)
WPD PLC [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Dec. 01, 2016
Interest rate on outstanding borrowing		1.89%		1.89%	1.86%		1.86%
WPD South West [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Jul. 01, 2019
WPD East Midlands [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Jul. 01, 2019
Interest rate on outstanding borrowing		1.01%		1.01%	1.00%		1.00%
WPD West Midlands [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Jul. 01, 2019
WPD [Member]
Financing Activities [Line Items]
Unused capacity				$ 1,300
PPL Capital Funding [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Jul. 28, 2019
PPL Capital Funding [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Nov. 12, 2018
PPL Capital Funding [Member] | Bilateral Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Mar. 26, 2016
PPL Electric [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Jul. 28, 2019
LKE [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Interest rate on outstanding borrowing		1.44%		1.44%	1.67%		1.67%
LKE [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Oct. 31, 2018
LGE [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Jul. 29, 2019
KU [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Jul. 29, 2019
KU [Member] | Letter Of Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Oct. 01, 2017
United Kingdom, Pounds [Member]
Financing Activities [Line Items]
Capacity | £		£ 1,120
Borrowed | £	[1]	242			£ 167
Letters of credit and commercial paper issued | £		4			5
Unused capacity | £	[1]	874
United Kingdom, Pounds [Member] | WPD PLC [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Capacity | £		210
Borrowed		130	[1]	$ 200	103	[1]	$ 161
Unused capacity | £		80
United Kingdom, Pounds [Member] | WPD South West [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Capacity | £		245
Unused capacity | £		245
United Kingdom, Pounds [Member] | WPD East Midlands [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Capacity | £		300
Borrowed		112	[1]	171	64	[1]	100
Unused capacity | £		188
United Kingdom, Pounds [Member] | WPD West Midlands [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Capacity | £		300
Unused capacity | £		300
United Kingdom, Pounds [Member] | WPD [Member] | Uncommitted Credit Facilities [Member]
Financing Activities [Line Items]
Capacity | £		65
Letters of credit and commercial paper issued | £		4			£ 5
Unused capacity | £		£ 61
United States of America, Dollars [Member] | PPL Capital Funding [Member]
Financing Activities [Line Items]
Capacity				815
Letters of credit and commercial paper issued				21			22
Unused capacity				794
United States of America, Dollars [Member] | PPL Capital Funding [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Capacity				300
Unused capacity				300
United States of America, Dollars [Member] | PPL Capital Funding [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Capacity				300
Unused capacity				300
United States of America, Dollars [Member] | PPL Capital Funding [Member] | Bilateral Credit Facility [Member]
Financing Activities [Line Items]
Capacity				150
Letters of credit and commercial paper issued				20			21
Unused capacity				130
United States of America, Dollars [Member] | PPL Capital Funding [Member] | Uncommitted Credit Facilities [Member]
Financing Activities [Line Items]
Capacity				65
Letters of credit and commercial paper issued				1			1
Unused capacity				64
United States of America, Dollars [Member] | PPL Electric [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Capacity				300
Letters of credit and commercial paper issued				169			1
Unused capacity				131
United States of America, Dollars [Member] | LKE [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Capacity				75
Borrowed	[2]			75			75
United States of America, Dollars [Member] | LGE [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Capacity				500
Letters of credit and commercial paper issued				259			264
Unused capacity				241
United States of America, Dollars [Member] | KU [Member]
Financing Activities [Line Items]
Capacity				598
Letters of credit and commercial paper issued				425			434
Unused capacity				173
United States of America, Dollars [Member] | KU [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Capacity				400
Letters of credit and commercial paper issued				227			236
Unused capacity				173
United States of America, Dollars [Member] | KU [Member] | Letter Of Credit Facility [Member]
Financing Activities [Line Items]
Capacity				198
Letters of credit and commercial paper issued				198			198
PPL Electric Utilities Corp [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Jul. 28, 2019
PPL Electric Utilities Corp [Member] | United States of America, Dollars [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Capacity				300
Letters of credit and commercial paper issued				169			$ 1
Unused capacity				$ 131
LG And E And KU Energy LLC [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Interest rate on outstanding borrowing		1.44%		1.44%	1.67%		1.67%
LG And E And KU Energy LLC [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Oct. 31, 2018
LG And E And KU Energy LLC [Member] | LGE [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Jul. 29, 2019
LG And E And KU Energy LLC [Member] | KU [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Jul. 29, 2019
LG And E And KU Energy LLC [Member] | KU [Member] | Letter Of Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Oct. 01, 2017
LG And E And KU Energy LLC [Member] | United States of America, Dollars [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Capacity				$ 75
Borrowed	[2]			75			$ 75
LG And E And KU Energy LLC [Member] | United States of America, Dollars [Member] | LGE [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Capacity				500
Letters of credit and commercial paper issued				259			264
Unused capacity				241
LG And E And KU Energy LLC [Member] | United States of America, Dollars [Member] | KU [Member]
Financing Activities [Line Items]
Capacity				598
Letters of credit and commercial paper issued				425			434
Unused capacity				173
LG And E And KU Energy LLC [Member] | United States of America, Dollars [Member] | KU [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Capacity				400
Letters of credit and commercial paper issued				227			236
Unused capacity				173
LG And E And KU Energy LLC [Member] | United States of America, Dollars [Member] | KU [Member] | Letter Of Credit Facility [Member]
Financing Activities [Line Items]
Capacity				198
Letters of credit and commercial paper issued				198			198
Louisville Gas And Electric Co [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Jul. 29, 2019
Louisville Gas And Electric Co [Member] | United States of America, Dollars [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Capacity				500
Letters of credit and commercial paper issued				259			264
Unused capacity				241
Kentucky Utilities Co [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Jul. 29, 2019
Kentucky Utilities Co [Member] | Letter Of Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Oct. 01, 2017
Kentucky Utilities Co [Member] | United States of America, Dollars [Member]
Financing Activities [Line Items]
Capacity				598
Letters of credit and commercial paper issued				425			434
Unused capacity				173
Kentucky Utilities Co [Member] | United States of America, Dollars [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Capacity				400
Letters of credit and commercial paper issued				227			236
Unused capacity				173
Kentucky Utilities Co [Member] | United States of America, Dollars [Member] | Letter Of Credit Facility [Member]
Financing Activities [Line Items]
Capacity				198
Letters of credit and commercial paper issued				$ 198			$ 198

[1] WPD plc 's amounts borrowed at June 30, 2015 and December 31, 2014 were USD-denominated borrowings of $ 200 million and $ 161 million, which bore interest at 1.89% and 1.86% . WPD (East Midlands) amounts borrowed at June 30, 2015 and December 31, 2014 were GBP-denominated borrowings which equated to $ 171 million and $ 100 million, which bore interes t at 1.01% for both periods. At June 30, 2015 , the unused capacity under the U.K. credit facilities was $ 1.3 billion.

[2] LKE’s interest rates on outstanding borrowings at June 30, 2015 and December 31, 2014 , were 1.44% and 1.67% .