Income Taxes (Reconciliation of Income Tax Expense) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016		Mar. 31, 2015
Reconciliation of Income Tax Expense
Federal income tax on Income (Loss) Before Income Taxes at statutory tax rate - 35%	$ 231		$ 269
Federal statutory tax rate	35.00%		35.00%
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	$ 13		$ 14
Valuation allowance adjustments	6		9
Impact of lower U.K. income tax rates	(54)		(62)
Interest benefit on United Kingdom financing entities	(5)		(7)
Stock-based compensation	(8)	[1]	0
Other	(4)		(6)
Total increase (decrease)	(52)		(52)
Total income tax from continuing operations	179		217
PPL Electric Utilities Corp [Member]
Reconciliation of Income Tax Expense
Federal income tax on Income (Loss) Before Income Taxes at statutory tax rate - 35%	$ 53		$ 51
Federal statutory tax rate	35.00%		35.00%
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	$ 9		$ 10
Stock-based compensation	(5)	[2]	0
Other	(1)		(2)
Total increase (decrease)	3		8
Total income tax from continuing operations	56		59
LG And E And KU Energy LLC [Member]
Reconciliation of Income Tax Expense
Federal income tax on Income (Loss) Before Income Taxes at statutory tax rate - 35%	$ 67		$ 68
Federal statutory tax rate	35.00%		35.00%
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	$ 7		$ 7
Valuation allowance adjustments	0		3
Stock-based compensation	(1)		0
Other	(1)		(2)
Total increase (decrease)	5		8
Total income tax from continuing operations	72		76
Louisville Gas And Electric Co [Member]
Reconciliation of Income Tax Expense
Federal income tax on Income (Loss) Before Income Taxes at statutory tax rate - 35%	$ 32		$ 30
Federal statutory tax rate	35.00%		35.00%
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	$ 3		$ 3
Total increase (decrease)	3		3
Total income tax from continuing operations	35		33
Kentucky Utilities Co [Member]
Reconciliation of Income Tax Expense
Federal income tax on Income (Loss) Before Income Taxes at statutory tax rate - 35%	$ 42		$ 44
Federal statutory tax rate	35.00%		35.00%
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	$ 4		$ 4
Other	0		(1)
Total increase (decrease)	4		3
Total income tax from continuing operations	$ 46		$ 47

[1] During the three months ended March 31, 2016, PPL recorded an $8 million tax benefit related to the application of new stock-based compensation accounting guidance. See Note 2 for additional information.

[2] During the three months ended March 31, 2016, PPL Electric recorded a $5 million tax benefit related to the application of new stock-based compensation accounting guidance. See Note 2 for additional information.