Income Taxes (Reconciliation of Income Tax Expense) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2015		Jun. 30, 2014		Jun. 30, 2015		Jun. 30, 2014
Reconciliation of Income Tax Expense
Federal income tax on Income (Loss) Before Income Taxes at statutory tax rate - 35%	$ 112		$ 139		$ 382		$ 333
Federal statutory tax rate	35.00%		35.00%		35.00%		35.00%
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	$ 9		$ 3		$ 29		$ 16
Valuation allowance adjustments	5		46	[1]	8		46	[1]
Impact of lower U.K. income tax rates	(36)		(31)		(98)		(76)
U.S. income tax on foreign earnings - net of foreign tax credit	0		10	[2]	(1)		21	[2]
Federal and state tax reserve adjustments	(12)	[3]	(1)		(12)	[3]	(1)
Intercompany interest on U.K. financing entities	(3)		(1)		(11)		(3)
Other	(4)		1		(9)		(3)
Total increase (decrease)	(41)		27		(94)		0
Total income tax from continuing operations	71		166		288		333
Income Tax Other Numeric [Abstract]
Refund for open audits for the years 1998-2011, subject to a final determination of interest on the refund	23
Refund reflected in continuing operations for open audits for the years 1998-2011, subject to a final determination of interest on the refund	11
PPL Electric Utilities Corp [Member]
Reconciliation of Income Tax Expense
Federal income tax on Income (Loss) Before Income Taxes at statutory tax rate - 35%	$ 30		$ 29		$ 81		$ 77
Federal statutory tax rate	35.00%		35.00%		35.00%		35.00%
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	$ 4		$ 4		$ 14		$ 12
Federal and state tax reserve adjustments	2		(1)		2		(1)
Depreciation not normalized	(1)		(1)		(2)		(3)
Other	1		0		0		(1)
Total increase (decrease)	6		2		14		7
Total income tax from continuing operations	36		31		95		84
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%	$ 37		$ 37		$ 104		$ 102
Federal statutory tax rate	35.00%		35.00%		35.00%		35.00%
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	$ 4		$ 4		$ 11		$ 10
Valuation allowance adjustments	5	[4]	0		8	[4]	0
Other	(1)		0		(2)		(2)
Total increase (decrease)	8		4		17		8
Total income tax from continuing operations	45		41		121		110
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%	$ 20		$ 20		$ 50		$ 48
Federal statutory tax rate	35.00%		35.00%		35.00%		35.00%
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	$ 2		$ 2		$ 5		$ 5
Other	0		(1)		0		(2)
Total increase (decrease)	2		1		5		3
Total income tax from continuing operations	22		21		55		51
Kentucky Utilities Co [Member]
Reconciliation of Income Tax Expense
Federal income tax on Income (Loss) Before Income Taxes at statutory tax rate - 35%	$ 22		$ 23		$ 66		$ 66
Federal statutory tax rate	35.00%		35.00%		35.00%		35.00%
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	$ 2		$ 2		$ 7		$ 7
Other	0		1		(2)		(1)
Total increase (decrease)	2		3		5		6
Total income tax from continuing operations	$ 24		$ 26		$ 71		$ 72

[1] As a result of the spinoff announceme nt, PPL recorded deferred income tax expense during the three and six months ended June 30, 2014 to adjust valuation allowances on deferred tax assets primarily for state net operating loss carryforwards that were previously supported by the earnings of PPL Energy Supply. See Note 8 for additional information on the spinoff .

[2] During the three and six months ended June 30, 201 5 , PPL recorded lower income tax expense due to a decrease in taxa ble dividends .

[3] During the three and six months ended June 30, 2015, PPL recorded a tax benefit to adjust the settled refund amount approved by Joint Committee of Taxation for the open audit years 1998-2011 .

[4] Represents a valuation allowance against tax credits expiring in 2016 and 2017 that are more likely than not to expire before being utilized.