Financing Activities (Distributions and Capital Contributions) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended
	Feb. 28, 2013	Mar. 31, 2013	Mar. 31, 2012
Distributions And Capital Contributions [Line Items]
Quarterly common stock dividend declaration date	2013-02
Dividend payable date of quarterly common stock dividend	Apr. 01, 2013
Current quarterly common stock dividend (in dollars per share)	$ 0.3675	$ 0.3675	$ 0.3600
Annualized current quarterly common stock dividend (in dollars per share)	$ 1.47
PPL Energy Supply LLC [Member]
Distributions And Capital Contributions [Line Items]
Dividends/distributions paid to parent/member		$ 313	$ 557
PPL Electric Utilities Corp [Member]
Distributions And Capital Contributions [Line Items]
Dividends/distributions paid to parent/member		25	35
Capital contributions received from parent/member		60
LG And E And KU Energy LLC [Member]
Distributions And Capital Contributions [Line Items]
Dividends/distributions paid to parent/member		4	25
Capital contributions received from parent/member		75
Louisville Gas And Electric Co [Member]
Distributions And Capital Contributions [Line Items]
Dividends/distributions paid to parent/member		19	15
Capital contributions received from parent/member		25
Kentucky Utilities Co [Member]
Distributions And Capital Contributions [Line Items]
Dividends/distributions paid to parent/member		13	24
Capital contributions received from parent/member		$ 50