Derivative Instruments and Hedging Activities (Commodity Volumetric Activity) (Details)	Dec. 31, 2012 MWh
Power [Member] | 2013 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	(38,791,951)
Power [Member] | 2014 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	(16,720,361)
Power [Member] | 2015 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	1,636,197
Power [Member] | Thereafter [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	3,871,199
Capacity [Member] | 2013 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	(8,248,465)
Capacity [Member] | 2014 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	(135,110)
Capacity [Member] | 2015 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	(37,208)
Capacity [Member] | Thereafter [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	525
Gas [Member] | 2013 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	18,419,599
Gas [Member] | 2014 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	(21,663,269)
Gas [Member] | 2015 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	(10,386,745)
Gas [Member] | Thereafter [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	(5,027,288)
Coal [Member] | 2013 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	(240,000)
Coal [Member] | 2014 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)
Coal [Member] | 2015 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)
Coal [Member] | Thereafter [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)
Financial Transmission Rights [Member] | 2013 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	28,690
Financial Transmission Rights [Member] | 2014 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	6,389
Financial Transmission Rights [Member] | 2015 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	1,465
Financial Transmission Rights [Member] | Thereafter [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)
Oil [Member] | 2013 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	(4,022,000)
Oil [Member] | 2014 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	240,000
Oil [Member] | 2015 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	300,000
Oil [Member] | Thereafter [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	180,000
PPL Energy Supply LLC [Member] | Power [Member] | 2013 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	(38,791,951)
PPL Energy Supply LLC [Member] | Power [Member] | 2014 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	(16,720,361)
PPL Energy Supply LLC [Member] | Power [Member] | 2015 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	1,636,197
PPL Energy Supply LLC [Member] | Power [Member] | Thereafter [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	3,871,199
PPL Energy Supply LLC [Member] | Capacity [Member] | 2013 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	(8,248,465)
PPL Energy Supply LLC [Member] | Capacity [Member] | 2014 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	(135,110)
PPL Energy Supply LLC [Member] | Capacity [Member] | 2015 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	(37,208)
PPL Energy Supply LLC [Member] | Capacity [Member] | Thereafter [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	525
PPL Energy Supply LLC [Member] | Gas [Member] | 2013 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	18,419,599
PPL Energy Supply LLC [Member] | Gas [Member] | 2014 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	(21,663,269)
PPL Energy Supply LLC [Member] | Gas [Member] | 2015 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	(10,386,745)
PPL Energy Supply LLC [Member] | Gas [Member] | Thereafter [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	(5,027,288)
PPL Energy Supply LLC [Member] | Coal [Member] | 2013 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	(240,000)
PPL Energy Supply LLC [Member] | Coal [Member] | 2014 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)
PPL Energy Supply LLC [Member] | Coal [Member] | 2015 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)
PPL Energy Supply LLC [Member] | Coal [Member] | Thereafter [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)
PPL Energy Supply LLC [Member] | Financial Transmission Rights [Member] | 2013 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	28,690
PPL Energy Supply LLC [Member] | Financial Transmission Rights [Member] | 2014 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	6,389
PPL Energy Supply LLC [Member] | Financial Transmission Rights [Member] | 2015 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	1,465
PPL Energy Supply LLC [Member] | Financial Transmission Rights [Member] | Thereafter [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)
PPL Energy Supply LLC [Member] | Oil [Member] | 2013 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	(4,022,000)
PPL Energy Supply LLC [Member] | Oil [Member] | 2014 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	240,000
PPL Energy Supply LLC [Member] | Oil [Member] | 2015 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	300,000
PPL Energy Supply LLC [Member] | Oil [Member] | Thereafter [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	180,000