Financing Activities (Distributions and Capital Contributions) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended		6 Months Ended
	May 31, 2013	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Distributions And Capital Contributions [Line Items]
Quarterly common stock dividend declaration date	2013-05
Dividend payable date of quarterly common stock dividend	Jul. 01, 2013
Current quarterly common stock dividend (in dollars per share)	$ 0.3675	$ 0.3675	$ 0.36	$ 0.735	$ 0.72
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	$ 657
Capital contributions received from parent/member		105	472	105	472
PPL Electric Utilities Corp [Member]
Distributions And Capital Contributions [Line Items]
Dividends/distributions paid to parent/member				66	56
Capital contributions received from parent/member		145		205
LG And E And KU Energy LLC [Member]
Distributions And Capital Contributions [Line Items]
Dividends/distributions paid to parent/member				69	60
Capital contributions received from parent/member		71		146
Louisville Gas And Electric Co [Member]
Distributions And Capital Contributions [Line Items]
Dividends/distributions paid to parent/member				48	31
Capital contributions received from parent/member		29		54
Kentucky Utilities Co [Member]
Distributions And Capital Contributions [Line Items]
Dividends/distributions paid to parent/member				55	48
Capital contributions received from parent/member		$ 42		$ 92