Preferred Securities (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended						1 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended	1 Months Ended		1 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Preferred Stock [Member]	Dec. 31, 2011 Preferred Stock [Member]	Dec. 31, 2010 Preferred Stock [Member]	Jun. 30, 2012 Preference Stock [Member]	Dec. 31, 2012 PPL Electric Utilities Corp [Member]	Dec. 31, 2011 PPL Electric Utilities Corp [Member]	Dec. 31, 2010 PPL Electric Utilities Corp [Member]	Apr. 30, 2010 PPL Electric Utilities Corp [Member] Preferred Stock [Member]	Dec. 31, 2012 PPL Electric Utilities Corp [Member] Preferred Stock [Member]	Apr. 30, 2010 PPL Electric Utilities Corp [Member] Series Preferred Stock [Member] Integer	Dec. 31, 2012 PPL Electric Utilities Corp [Member] Series Preferred Stock [Member]	Apr. 30, 2010 PPL Electric Utilities Corp [Member] Preferred Stock And Series Preferred Stock [Member]	Jun. 30, 2012 PPL Electric Utilities Corp [Member] Preference Stock [Member]	Dec. 31, 2012 PPL Electric Utilities Corp [Member] Preference Stock [Member]	Dec. 31, 2011 PPL Electric Utilities Corp [Member] Preference Stock [Member]	Dec. 31, 2010 PPL Electric Utilities Corp [Member] Preference Stock [Member]	Dec. 31, 2012 Louisville Gas And Electric Co [Member] Preferred Stock [Member]	Dec. 31, 2012 Louisville Gas And Electric Co [Member] Preferred Stock Without Par Value [Member]	Dec. 31, 2012 Kentucky Utilities Co [Member] Preferred Stock Without Par Value [Member]	Dec. 31, 2012 Kentucky Utilities Co [Member] Preference Stock Without Par Value [Member]
Preferred Securities [Line Items]
Dividend requirements on noncontrolling interests				$ 4	$ 16	$ 17		$ 4	$ 16	$ 17
Shares authorized				10,000,000								629,936		10,000,000			10,000,000			1,720,000	6,750,000	5,300,000	2,000,000
Percentage rate on stock												4.50%					6.25%
Date stock redemeed							Jun. 30, 2012				Apr. 30, 2010		Apr. 30, 2010			Jun. 30, 2012
Number of shares of stock redeemed											247,524		257,665			2,500,000
Number of series of stock redeemed													4
Aggregate value of stock redeemed							250								51	250
Value of stock redeemed including accumulated dividends	$ 250		$ 54					$ 250		$ 54					$ 54
Par value of stock																$ 100				$ 25
Number of shares issued																		2,500,000	2,500,000
Number of shares outstanding																		2,500,000	2,500,000
Depositary shares																10,000,000
Depositary shares rate of interest in Preference Shares																0.25%
Liquidation preference (in dollars per share)																$ 100
Depositary share (in dollars per share)																$ 25