Financing Activities (Distributions and Capital Contributions) (Details) (USD $)	1 Months Ended	3 Months Ended																12 Months Ended
	Nov. 30, 2014	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Distributions [Line Items]
Quarterly common stock dividend declaration date	2014-11
Dividend payable date of quarterly common stock dividend	Jan. 02, 2015
Current quarterly common stock dividend (in dollars per share)	$ 0.3725	$ 0.3725	[1],[2]	$ 0.3725	[1],[2]	$ 0.3725	[1],[2]	$ 0.3725	[1],[2]	$ 0.3675	[1],[2]	$ 0.3675	[1],[2]	$ 0.3675	[1],[2]	$ 0.3675	[1],[2]	$ 1.49	$ 1.47	$ 1.44
Annualized current quarterly common stock dividend (in dollars per share)	$ 1.49
Maximum amount of planned distribution from subsidiary to parent in first quarter 2015																		$ 191,000,000
Restricted net assets at end of period		2,400,000,000																2,400,000,000
Unrestricted assets at the end of period		2,900,000,000																2,900,000,000
Minimum adjusted equity to total capitalization in order to pay dividends																		30.00%
PPL Energy Supply LLC [Member]
Distributions [Line Items]
Maximum amount of planned distribution from subsidiary to parent in first quarter 2015																		191,000,000
Restricted net assets at end of period		3,700,000,000																3,700,000,000
LG And E And KU Energy LLC [Member]
Distributions [Line Items]
Restricted net assets at end of period		2,400,000,000																2,400,000,000
Unrestricted assets at the end of period		2,900,000,000																2,900,000,000
Minimum adjusted equity to total capitalization in order to pay dividends																		30.00%
Louisville Gas And Electric Co [Member]
Distributions [Line Items]
Restricted net assets at end of period		900,000,000																900,000,000
Unrestricted assets at the end of period		1,200,000,000																1,200,000,000
Minimum adjusted equity to total capitalization in order to pay dividends																		30.00%
Kentucky Utilities Co [Member]
Distributions [Line Items]
Restricted net assets at end of period		1,500,000,000																1,500,000,000
Unrestricted assets at the end of period		$ 1,700,000,000																$ 1,700,000,000
Minimum adjusted equity to total capitalization in order to pay dividends																		30.00%

[1] Quarterly results can vary depending on, among other things, weather and the forward pricing of power. Accordingly, comparisons among quarters of a year may not be indicative of overall trends and changes in operations.

[2] PPL has paid quarterly cash dividends on its common stock in every year since 1946. Future dividends, declared at the discretion of the Board of Directors, will be dependent upon future earnings, cash flows, financial requirements and other factors.