Income Taxes (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended					9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016		Jun. 30, 2016	Sep. 30, 2015		Sep. 30, 2016		Sep. 30, 2015
Income Taxes [Line Items]
Benefit related to planned amendment of prior period tax return					$ 9				$ 9
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income from Continuing Operations Before Income Taxes at statutory tax rate - 35%		$ 214			$ 189		$ 681		$ 571
Federal statutory tax rate		35.00%			35.00%		35.00%		35.00%
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit		$ 13			$ 15		$ 37		$ 44
Valuation allowance adjustments		4			0		13		8
Impact of lower U.K. income tax rates		(37)			(40)		(136)		(138)
Federal and state tax reserve adjustments		0			(9)	[1]	0		(21)	[1]
Enactment of the U.K. Finance Act 2016		(42)	[2]		0		(42)	[2]	0
Depreciation not normalized		0			0		(6)		(4)
Interest benefit on U.K. financing entities		(4)			(4)		(13)		(15)
Stock-based compensation		(1)	[3]		0		(12)	[3]	0
Other		(8)			(7)		(12)		(13)
Total increase (decrease)		(75)			(45)		(171)		(139)
Total income tax		139			144		510		432
Adjustment to settled refund for the years 1998-2011									12
Future U.K. statutory income tax rate revised in current year	18.00%
U.K. statutory income tax rate reduction in year five	17.00%
Income Tax Other Numeric [Abstract]
Tax Adjustments Settlements And Unusual Provisions				$ 3	24
Refund reflected in continuing operations for open audits for the years 1998-2011					12
PPL Electric Utilities Corp [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income from Continuing Operations Before Income Taxes at statutory tax rate - 35%		$ 52			$ 32		$ 149		$ 112
Federal statutory tax rate		35.00%			35.00%		35.00%		35.00%
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit		$ 9			$ 7		$ 27		$ 21
Depreciation not normalized		(2)			(1)		(5)		(3)
Stock-based compensation		0			0		(7)	[4]	0
Other		(1)			(3)		(2)		0
Total increase (decrease)		6			3		13		18
Total income tax		58			35		162		130
LG And E And KU Energy LLC [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income from Continuing Operations Before Income Taxes at statutory tax rate - 35%		$ 74			$ 68		$ 189		$ 172
Federal statutory tax rate		35.00%			35.00%		35.00%		35.00%
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit		$ 8			$ 7		$ 20		$ 18
Amortization of investment tax credit		(1)			(1)		(2)		(2)
Valuation allowance adjustments		0			0		0		8	[5]
Stock-based compensation		(1)			0		(2)		0
Other		(1)			(1)		(3)		(2)
Total increase (decrease)		5			5		13		22
Total income tax		79			73		202		194
Louisville Gas And Electric Co [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income from Continuing Operations Before Income Taxes at statutory tax rate - 35%		$ 36			$ 33		$ 90		$ 83
Federal statutory tax rate		35.00%			35.00%		35.00%		35.00%
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit		$ 4			$ 4		$ 10		$ 9
Other		(1)			(1)		(2)		(1)
Total increase (decrease)		3			3		8		8
Total income tax		39			36		98		91
Kentucky Utilities Co [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income from Continuing Operations Before Income Taxes at statutory tax rate - 35%		$ 44			$ 41		$ 117		$ 106
Federal statutory tax rate		35.00%			35.00%		35.00%		35.00%
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit		$ 5			$ 4		$ 12		$ 11
Other		(1)			(1)		(1)		(2)
Total increase (decrease)		4			3		11		9
Total income tax		$ 48			$ 44		$ 128		$ 115

[1] During the three and nine months ended September 30, 2015, PPL recorded a $9 million tax benefit related to a planned amendment of a prior period tax return.During the nine months ended September 30, 2015, PPL recorded a $12 million tax benefit to adjust the settled refund amount approved by the Joint Committee on Taxation for the open audit years 1998 - 2011.

[2] During the three and nine months ended September 30, 2016, PPL recorded lower income tax expense related to the application of new stock-based compensation accounting guidance. See Note 2 for additional information.

[3] During the three and nine months ended September 30, 2016, PPL recorded lower income tax expense related to the application of new stock-based compensation accounting guidance. See Note 2 for additional information.

[4] During the nine months ended September 30, 2016, PPL Electric recorded lower income tax expense related to the application of new stock-based compensation accounting guidance. See Note 2 for additional information.

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