Income Taxes (Reconciliation of Income Tax Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended				12 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2011
Reconciliation of Income Tax Expense
Federal income tax on Income (Loss) Before Income Taxes at statutory tax rate - 35%	$ 132		$ 180		$ 282		$ 377
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	(7)		14		(5)		17
State valuation allowance adjustments	46				46
Impact of lower U.K. income tax rates	(31)		(25)		(76)		(63)
U.S. income tax on foreign earnings - net of foreign tax credit	10	[1]	(7)	[1]	21	[1]	(5)	[1]
Federal and state tax reserve adjustments			(39)	[2]			(40)	[2]
Federal income tax credits, excluding foreign tax credit	(1)		(2)		(2)		(5)
Amortization of investment tax credit	(1)		(2)		(3)		(5)
Depreciation not normalized	(2)		(1)		(4)		(4)
State deferred tax rate change	3				3
Other			(9)		(1)		(12)
Total increase (decrease)	17		(71)		(21)		(117)
Total income tax from continuing operations	149		109		261		260
Increase to income tax expense primarily attributable to a revision in the expected taxable amount of cash repatriation in 2013			14				14
Benefit related to the recalculation of 2010 United Kingdom earnings and profits			(19)				(19)
Expense from reversal by United States Court of Appeals for the Third Circuit on deductibility of United Kingdom windfall profit tax									39
Benefit from favorable United States Tax Court decision on deductibility of United Kingdom windfall profit tax			44				44
Interest portion of benefit from favorable United States Tax Court decision on deductibility of United Kingdom windfall profit tax			19				19
PPL Energy Supply LLC [Member]
Reconciliation of Income Tax Expense
Federal income tax on Income (Loss) Before Income Taxes at statutory tax rate - 35%	4		54		(37)		28
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)		9		(18)		3
Federal and state tax reserve adjustments	1		7		1		6
Federal income tax credits, excluding foreign tax credit					(1)		(3)
State deferred tax rate change	3				3
Other	(2)		(3)				(2)
Total increase (decrease)	(7)		13		(15)		4
Total income tax from continuing operations	(3)		67		(52)		32
Prior Period Adjustment (Numeric) [Abstract]
Out of period adjustment amount	(9)
PPL Energy Supply LLC [Member] | Adjustment To 2014 Interim Tax Rate [Member]
Prior Period Adjustment (Numeric) [Abstract]
Out of period adjustment amount	(5)
PPL Energy Supply LLC [Member] | Adjustment To 2013 Tax Rates [Member]
Prior Period Adjustment (Numeric) [Abstract]
Out of period adjustment amount	(4)
PPL Electric Utilities Corp [Member]
Reconciliation of Income Tax Expense
Federal income tax on Income (Loss) Before Income Taxes at statutory tax rate - 35%	29		24		77		58
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		3		12		8
Federal and state tax reserve adjustments	(1)		(2)		(1)		(4)
Depreciation not normalized	(1)		(1)		(3)		(4)
Other					(1)		(1)
Total increase (decrease)	2				7		(1)
Total income tax from continuing operations	31		24		84		57
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		35		102		89
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		3		10		8
Other			(1)		(2)		(3)
Total increase (decrease)	4		2		8		5
Total income tax from continuing operations	41		37		110		94
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		16		48		40
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		1		5		4
Other	(1)				(2)		(2)
Total increase (decrease)	1		1		3		2
Total income tax from continuing operations	21		17		51		42
Kentucky Utilities Co [Member]
Reconciliation of Income Tax Expense
Federal income tax on Income (Loss) Before Income Taxes at statutory tax rate - 35%	23		25		66		61
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		6
Other	1		(1)		(1)		(2)
Total increase (decrease)	3		1		6		4
Total income tax from continuing operations	$ 26		$ 26		$ 72		$ 65

[1] During the three and six months ended June 30, 2014, PPL recorded income tax expense primarily attributable to the expected taxable amount of cash repatriation in 2014.                  During the three and six months ended June 30, 2013, PPL recorded a $14 million increase to income tax expense primarily attributable to a revision in the expected taxable amount of cash repatriation in 2013 offset by a $19 million income tax benefit associated with a ruling obtained from the IRS impacting the recalculation of 2010 U.K. earnings and profits that was reflected on amended 2010 U.S. tax returns.

[2] In 1997, the U.K. imposed a Windfall Profits Tax (WPT) on privatized utilities, including WPD. PPL filed its tax returns for years subsequent to its 1997 and 1998 claims for refund on the basis that the U.K. WPT was creditable. In September 2010, the U.S. Tax Court (Tax Court) ruled in PPL's favor in a dispute with the IRS, concluding that the U.K. WPT is a creditable tax for U.S. tax purposes. In January 2011, the IRS appealed the Tax Court's decision to the U.S. Court of Appeals for the Third Circuit (Third Circuit). In December 2011, the Third Circuit issued its opinion reversing the Tax Court's decision, holding that the U.K. WPT is not a creditable tax. As a result of the Third Circuit’s adverse determination, PPL recorded a $39 million expense in 2011. In June 2012, the U.S. Court of Appeals for the Fifth Circuit issued a contrary opinion in an identical case involving another company. In July 2012, PPL filed a petition for a writ of certiorari seeking U.S. Supreme Court review of the Third Circuit's opinion. The Supreme Court granted PPL's petition and oral argument was held in February 2013. In May 2013, the Supreme Court reversed the Third Circuit’s opinion and ruled that the WPT is a creditable tax. As a result of the Supreme Court ruling, PPL recorded a tax benefit of $44 million during the three and six months ended June 30, 2013, of which $19 million relates to interest.