Financing Activities (Distributions and Capital Contributions) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Distributions And Capital Contributions [Line Items]
Quarterly common stock dividend declaration date	2013-08
Dividend payable date of quarterly common stock dividend	Oct. 01, 2013
Current quarterly common stock dividend (in dollars per share)	$ 0.3675	$ 0.3675	$ 0.36	$ 1.1025	$ 1.08
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				$ 408	$ 733
Capital contributions received from parent/member				980	472
PPL Electric Utilities Corp [Member]
Distributions And Capital Contributions [Line Items]
Dividends/distributions paid to parent/member				94	75
Capital contributions received from parent/member				205	150
LG And E And KU Energy LLC [Member]
Distributions And Capital Contributions [Line Items]
Dividends/distributions paid to parent/member				116	95
Capital contributions received from parent/member				146
Louisville Gas And Electric Co [Member]
Distributions And Capital Contributions [Line Items]
Dividends/distributions paid to parent/member				67	47
Capital contributions received from parent/member				54
Kentucky Utilities Co [Member]
Distributions And Capital Contributions [Line Items]
Dividends/distributions paid to parent/member				83	68
Capital contributions received from parent/member				$ 92