Income Taxes (Reconciliation of Income Tax Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Reconciliation of Income Tax Expense
Federal income tax on Income (Loss) Before Income Taxes at statutory tax rate - 35%	$ 150	$ 197
Federal statutory tax rate	35.00%	35.00%
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	2	3
Impact of lower U.K. income tax rates	(45)	(38)
U.S. income tax on foreign earnings - net of foreign tax credit	11	2
Federal income tax credits, excluding foreign tax credit	(1)	(4)
Amortization of investment tax credit	(2)	(3)
Depreciation not normalized	(2)	(3)
Other	(1)	(3)
Total increase (decrease)	(38)	(46)
Total income tax from continuing operations	112	151
PPL Energy Supply LLC [Member]
Reconciliation of Income Tax Expense
Federal income tax on Income (Loss) Before Income Taxes at statutory tax rate - 35%	(40)	(26)
Federal statutory tax rate	35.00%	35.00%
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	(9)	(6)
Federal income tax credits, excluding foreign tax credit	(1)	(3)
Other	1
Total increase (decrease)	(9)	(9)
Total income tax from continuing operations	(49)	(35)
PPL Electric Utilities Corp [Member]
Reconciliation of Income Tax Expense
Federal income tax on Income (Loss) Before Income Taxes at statutory tax rate - 35%	48	34
Federal statutory tax rate	35.00%	35.00%
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	8	5
Federal and state tax reserve adjustments		(2)
Depreciation not normalized	(2)	(3)
Other	(1)	(1)
Total increase (decrease)	5	(1)
Total income tax from continuing operations	53	33
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%	64	54
Federal statutory tax rate	35.00%	35.00%
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	7	5
Other	(2)	(2)
Total increase (decrease)	5	3
Total income tax from continuing operations	69	57
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%	29	24
Federal statutory tax rate	35.00%	35.00%
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	3	3
Other	(2)	(2)
Total increase (decrease)	1	1
Total income tax from continuing operations	30	25
Kentucky Utilities Co [Member]
Reconciliation of Income Tax Expense
Federal income tax on Income (Loss) Before Income Taxes at statutory tax rate - 35%	43	36
Federal statutory tax rate	35.00%	35.00%
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	4	4
Other	(1)	(1)
Total increase (decrease)	3	3
Total income tax from continuing operations	$ 46	$ 39