Financing Activities (Credit Arrangements) (Details) £ in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2016 GBP (£)	Mar. 31, 2016 USD ($)	Feb. 19, 2016 GBP (£)	Dec. 31, 2015 GBP (£)	Dec. 31, 2015 USD ($)
WPD PLC [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Jan. 13, 2021
Interest rate on outstanding borrowing		1.26%	1.26%		1.83%	1.83%
WPD South West [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Jul. 01, 2020
WPD East Midlands [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Jul. 01, 2020
Interest rate on outstanding borrowing		0.91%	0.91%
WPD West Midlands [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Jul. 01, 2020
WPD [Member]
Financing Activities [Line Items]
Unused capacity			$ 1,300
PPL Capital Funding [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Jan. 29, 2021
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. 17, 2017
PPL Electric [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Jan. 29, 2021
LKE [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Interest rate on outstanding borrowing					1.68%	1.68%
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		Dec. 31, 2020
KU [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Dec. 31, 2020
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 | £		£ 1,095
Borrowed | £	[1]	181			£ 133
Letters of credit and commercial paper issued | £		4			4
Unused capacity | £	[1]	916
United Kingdom, Pounds [Member] | WPD PLC [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Capacity | £		210
Borrowed		144	200	£ 138	133	$ 200
Unused capacity | £		72
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		37	51
Unused capacity | £		263
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 | £		40
Letters of credit and commercial paper issued | £		4			£ 4
Unused capacity | £		£ 36
United States of America, Dollars [Member] | PPL Capital Funding [Member]
Financing Activities [Line Items]
Capacity			1,150
Letters of credit and commercial paper issued			790			471
Unused capacity			360
United States of America, Dollars [Member] | PPL Capital Funding [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Capacity			700
Letters of credit and commercial paper issued			700			151
Unused capacity			0
United States of America, Dollars [Member] | PPL Capital Funding [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Capacity			300
Letters of credit and commercial paper issued			73			300
Unused capacity			227
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			17			20
Unused capacity			133
United States of America, Dollars [Member] | PPL Electric [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Capacity			400
Letters of credit and commercial paper issued			126			1
Unused capacity			274
United States of America, Dollars [Member] | LKE [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Capacity			75
Borrowed	[2]					75
Unused capacity			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			82			142
Unused capacity			418
United States of America, Dollars [Member] | KU [Member]
Financing Activities [Line Items]
Capacity			598
Letters of credit and commercial paper issued			232			246
Unused capacity			366
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			34			48
Unused capacity			366
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
Unused capacity			0
PPL Electric Utilities Corp [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Jan. 29, 2021
PPL Electric Utilities Corp [Member] | United States of America, Dollars [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Capacity			400
Letters of credit and commercial paper issued			126			$ 1
Unused capacity			274
LG And E And KU Energy LLC [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Interest rate on outstanding borrowing					1.68%	1.68%
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		Dec. 31, 2020
LG And E And KU Energy LLC [Member] | KU [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Dec. 31, 2020
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
Unused capacity			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			82			142
Unused capacity			418
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			232			246
Unused capacity			366
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			34			48
Unused capacity			366
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
Unused capacity			0
Louisville Gas And Electric Co [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Dec. 31, 2020
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			82			142
Unused capacity			418
Kentucky Utilities Co [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date		Dec. 31, 2020
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			232			246
Unused capacity			366
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			34			48
Unused capacity			366
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
Unused capacity			$ 0

[1] WPD plc 's amounts borrowed at March 31, 2016 and December 31, 2015 were USD-denominated borrowings of $ 200 million for both periods, which bore interest at 1.26% and 1.83% . The unused capacity reflects the amount borrowed in GBP of £ 138 million as of the date borrowed. WPD (East Midlands) amount borrowed at March 31, 2016 was a GBP-denominated borrowing which equated to $ 51 million and bore interest at 0.91% . At March 31, 2016 , the unused capacity under the U.K. credit facilities was approximately $ 1.3 billion.

[2] LKE’s interest rate on outstanding bor rowings at December 31, 2015 was 1.68% .