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, 2014	Mar. 31, 2014	Mar. 31, 2013
Distributions [Line Items]
Quarterly common stock dividend declaration date	2014-02
Dividend payable date of quarterly common stock dividend	Apr. 01, 2014
Current quarterly common stock dividend (in dollars per share)	$ 0.3725	$ 0.3725	$ 0.3675
Annualized current quarterly common stock dividend (in dollars per share)	$ 1.49
PPL Energy Supply LLC [Member]
Distributions [Line Items]
Dividends/distributions paid to parent/member		$ 654	$ 313
PPL Electric Utilities Corp [Member]
Distributions [Line Items]
Dividends/distributions paid to parent/member		32	25
Capital contributions received from parent/member		65	60
LG And E And KU Energy LLC [Member]
Distributions [Line Items]
Dividends/distributions paid to parent/member		104	4
Capital contributions received from parent/member		40	75
Louisville Gas And Electric Co [Member]
Distributions [Line Items]
Dividends/distributions paid to parent/member		27	19
Capital contributions received from parent/member			25
Kentucky Utilities Co [Member]
Distributions [Line Items]
Dividends/distributions paid to parent/member		37	13
Capital contributions received from parent/member		$ 40	$ 50