Derivative Instruments and Hedging Activities (Commodity Volumes Volumetric Activity) (Details)	Dec. 31, 2013 MWh
Purchase Contracts [Member] | Power [Member] | 2016 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	4,348,927	[1]
Purchase Contracts [Member] | Power [Member] | Thereafter [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	18,931,370	[1]
Purchase Contracts [Member] | Capacity [Member] | 2016 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	501	[1]
Purchase Contracts [Member] | Capacity [Member] | Thereafter [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	9	[1]
Purchase Contracts [Member] | Gas [Member] | 2014 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	25,869,617	[1]
Purchase Contracts [Member] | Gas [Member] | 2016 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	19,082,945	[1]
Purchase Contracts [Member] | Coal [Member] | 2014 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	495,900	[1]
Purchase Contracts [Member] | Coal [Member] | 2015 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)
Purchase Contracts [Member] | Coal [Member] | 2016 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)
Purchase Contracts [Member] | Coal [Member] | Thereafter [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)
Purchase Contracts [Member] | Financial Transmission Rights [Member] | 2014 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	9,581	[1]
Purchase Contracts [Member] | Financial Transmission Rights [Member] | 2015 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	1,705	[1]
Purchase Contracts [Member] | Financial Transmission Rights [Member] | 2016 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)
Purchase Contracts [Member] | Financial Transmission Rights [Member] | Thereafter [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)
Purchase Contracts [Member] | Oil [Member] | 2014 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	150,000	[1]
Purchase Contracts [Member] | Oil [Member] | 2015 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	380,869	[1]
Purchase Contracts [Member] | Oil [Member] | 2016 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	274,137	[1]
Purchase Contracts [Member] | Oil [Member] | Thereafter [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	101,261	[1]
Sales Contracts [Member] | Power [Member] | 2014 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	33,278,963	[1]
Sales Contracts [Member] | Power [Member] | 2015 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	14,421,817	[1]
Sales Contracts [Member] | Capacity [Member] | 2014 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	19,575	[1]
Sales Contracts [Member] | Capacity [Member] | 2015 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	3,929	[1]
Sales Contracts [Member] | Gas [Member] | 2015 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	33,082,289	[1]
Sales Contracts [Member] | Gas [Member] | Thereafter [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	9,202,403	[1]
PPL Energy Supply LLC [Member] | Purchase Contracts [Member] | Power [Member] | 2016 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	4,348,927	[1]
PPL Energy Supply LLC [Member] | Purchase Contracts [Member] | Power [Member] | Thereafter [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	18,931,370	[1]
PPL Energy Supply LLC [Member] | Purchase Contracts [Member] | Capacity [Member] | 2016 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	501	[1]
PPL Energy Supply LLC [Member] | Purchase Contracts [Member] | Capacity [Member] | Thereafter [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	9	[1]
PPL Energy Supply LLC [Member] | Purchase Contracts [Member] | Gas [Member] | 2014 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	25,869,617	[1]
PPL Energy Supply LLC [Member] | Purchase Contracts [Member] | Gas [Member] | 2016 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	19,082,945	[1]
PPL Energy Supply LLC [Member] | Purchase Contracts [Member] | Coal [Member] | 2014 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	495,900	[1]
PPL Energy Supply LLC [Member] | Purchase Contracts [Member] | Coal [Member] | 2015 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)
PPL Energy Supply LLC [Member] | Purchase Contracts [Member] | Coal [Member] | 2016 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)
PPL Energy Supply LLC [Member] | Purchase Contracts [Member] | Coal [Member] | Thereafter [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)
PPL Energy Supply LLC [Member] | Purchase Contracts [Member] | Financial Transmission Rights [Member] | 2014 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	9,581	[1]
PPL Energy Supply LLC [Member] | Purchase Contracts [Member] | Financial Transmission Rights [Member] | 2015 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	1,705	[1]
PPL Energy Supply LLC [Member] | Purchase Contracts [Member] | Financial Transmission Rights [Member] | 2016 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)
PPL Energy Supply LLC [Member] | Purchase Contracts [Member] | Financial Transmission Rights [Member] | Thereafter [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)
PPL Energy Supply LLC [Member] | Purchase Contracts [Member] | Oil [Member] | 2014 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	150,000	[1]
PPL Energy Supply LLC [Member] | Purchase Contracts [Member] | Oil [Member] | 2015 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	380,869	[1]
PPL Energy Supply LLC [Member] | Purchase Contracts [Member] | Oil [Member] | 2016 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	274,137	[1]
PPL Energy Supply LLC [Member] | Purchase Contracts [Member] | Oil [Member] | Thereafter [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	101,261	[1]
PPL Energy Supply LLC [Member] | Sales Contracts [Member] | Power [Member] | 2014 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	33,278,963	[1]
PPL Energy Supply LLC [Member] | Sales Contracts [Member] | Power [Member] | 2015 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	14,421,817	[1]
PPL Energy Supply LLC [Member] | Sales Contracts [Member] | Capacity [Member] | 2014 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	19,575	[1]
PPL Energy Supply LLC [Member] | Sales Contracts [Member] | Capacity [Member] | 2015 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	3,929	[1]
PPL Energy Supply LLC [Member] | Sales Contracts [Member] | Gas [Member] | 2015 [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	33,082,289	[1]
PPL Energy Supply LLC [Member] | Sales Contracts [Member] | Gas [Member] | Thereafter [Member]
Commodity Volumetric Activity [Line Items]
Notional amount (in units)	9,202,403	[1]

[1] Volumes for option contracts factor in the probability of an option being exercised and may be less than the notional amount of the option.