Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2016		Jun. 30, 2015		Jun. 30, 2016		Jun. 30, 2015
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income from Continuing Operations Before Income Taxes at statutory tax rate - 35%	$ 236		$ 112		$ 467		$ 382
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		$ 9		$ 22		$ 29
Valuation allowance adjustments	3		5		9		8
Impact of lower U.K. income tax rates	(45)		(36)		(99)		(98)
Federal and state tax reserve adjustments	0		(12)	[1]	0		(12)	[1]
Interest benefit on United Kingdom financing entities	(4)		(3)		(9)		(11)
Stock-based compensation	(3)	[2]	0		(11)	[2]	0
Other	(4)		(4)		(8)		(10)
Total increase (decrease)	(44)		(41)		(96)		(94)
Total income tax	192		71		371		288
Income Tax Other Numeric [Abstract]
Refund for open audits for the years 1998-2011	3		23
Refund reflected in continuing operations for open audits for the years 1998-2011			11
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%	$ 44		$ 30		$ 97		$ 81
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		$ 4		$ 18		$ 14
Federal and state tax reserve adjustments	0		2		0		2
Depreciation not normalized	(2)		(1)		(3)		(2)
Stock-based compensation	(2)	[3]	0		(7)	[3]	0
Other	0		1		(1)		0
Total increase (decrease)	4		6		7		14
Total income tax	48		36		104		95
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%	$ 47		$ 37		$ 114		$ 104
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
Valuation allowance adjustments	0		5	[4]	0		8	[4]
Stock-based compensation	0		0		(1)		0
Other	(1)		(1)		(2)		(2)
Total increase (decrease)	4		8		9		17
Total income tax	51		45		123		121
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%	$ 22		$ 20		$ 54		$ 50
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	$ 2		$ 2		$ 6		$ 5
Other	0		0		(1)		0
Total increase (decrease)	2		2		5		5
Total income tax	24		22		59		55
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%	$ 31		$ 22		$ 73		$ 66
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	$ 3		$ 2		$ 7		$ 7
Other	0		0		0		(2)
Total increase (decrease)	3		2		7		5
Total income tax	$ 34		$ 24		$ 80		$ 71

[1] 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.

[2] During the three and six months ended June 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 six months ended June 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.

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