Derivative Instruments and Hedging Activities (Commodity Volumetric Activity) (Details)	9 Months Ended
	Sep. 30, 2012 Integer MW
Commodity Volumetric Activity (Numeric) [Abstract]
Number of strategies used to maximize wholesale energy portfolio value	4
Commodity Volumetric Activity - Sales of Baseload Generation (Numeric) [Abstract]
Baseload generation fleet capacity (in MW)	7,252
Commodity Volumetric Activity - Optimization of Intermediate and Peaking Generation (Numeric) [Abstract]
Intermediate and peaking generation fleet capacity (in MW)	3,256
Commodity Volumetric Activity - Proprietary Trading Activity (Numeric) [Abstract]
Insignificant or no proprietary trading positions	insignificant
2012 [Member] | GWh [Member]
Expected Sales, in GWh, of Baseload Generation [Abstract]
Expected sales of baseload generation (in GWh)	12,928	[1]
2012 [Member] | Percent Unit [Member]
Percentage Of Expected Baseload Generation Sales [Abstract]
Derivative sales, as percentage of expected baseload generation	93.00%	[2],[3]
Total power sales, as percentage of expected baseload generation	100.00%	[3],[4]
Coal fuel purchases, as percentage of expected baseload generation	105.00%	[3],[5]
Nuclear fuel purchases, as percentage of expected baseload generation	100.00%	[3],[5]
2013 [Member] | GWh [Member]
Expected Sales, in GWh, of Baseload Generation [Abstract]
Expected sales of baseload generation (in GWh)	49,593
2013 [Member] | Percent Unit [Member]
Percentage Of Expected Baseload Generation Sales [Abstract]
Derivative sales, as percentage of expected baseload generation	88.00%	[2]
Total power sales, as percentage of expected baseload generation	95.00%	[4]
Coal fuel purchases, as percentage of expected baseload generation	97.00%	[5]
Nuclear fuel purchases, as percentage of expected baseload generation	100.00%	[5]
2014 [Member] | GWh [Member]
Expected Sales, in GWh, of Baseload Generation [Abstract]
Expected sales of baseload generation (in GWh)	50,401
2014 [Member] | Percent Unit [Member]
Percentage Of Expected Baseload Generation Sales [Abstract]
Derivative sales, as percentage of expected baseload generation	50.00%	[2],[6]
Total power sales, as percentage of expected baseload generation	55.00%	[4]
Coal fuel purchases, as percentage of expected baseload generation	77.00%	[5]
Nuclear fuel purchases, as percentage of expected baseload generation	100.00%	[5]
Future Years [Member] | GWh [Member]
Expected Sales, in GWh, of Baseload Generation [Abstract]
Expected sales of baseload generation (in GWh)	2,710
Future Years [Member] | Bcf [Member]
Expected Sales, in GWh, of Baseload Generation [Abstract]
Expected sales of baseload generation (in GWh)	4.0
Capacity [Member] | 2012 [Member] | MW-Months [Member]
Notional amounts included under applicable contracts [Abstract]
Notional amount (in units)	(3,098)	[7]
Capacity [Member] | 2013 [Member] | MW-Months [Member]
Notional amounts included under applicable contracts [Abstract]
Notional amount (in units)	(5,446)	[7]
Capacity [Member] | 2014 [Member] | MW-Months [Member]
Notional amounts included under applicable contracts [Abstract]
Notional amount (in units)	(2,078)	[7]
Capacity [Member] | Future Years [Member] | MW-Months [Member]
Capacity Positions [Abstract]
Capacity positions that deliver in future periods (in MW-months)	989
Financial Transmission Rights [Member] | 2012 [Member] | GWh [Member]
Volumes of Derivative FTR and basis (sales)/purchase contracts [Abstract]
FTRs (in GWh)	13,843	[3]
Financial Transmission Rights [Member] | 2013 [Member] | GWh [Member]
Volumes of Derivative FTR and basis (sales)/purchase contracts [Abstract]
FTRs (in GWh)	21,078
Financial Transmission Rights [Member] | 2014 [Member] | GWh [Member]
Volumes of Derivative FTR and basis (sales)/purchase contracts [Abstract]
FTRs (in GWh)	2,727	[8]
Power Basis Positions [Member] | 2012 [Member] | GWh [Member]
Volumes of Derivative FTR and basis (sales)/purchase contracts [Abstract]
Power basis positions (in GWh)	(3,854)	[3]
Power Basis Positions [Member] | 2013 [Member] | GWh [Member]
Volumes of Derivative FTR and basis (sales)/purchase contracts [Abstract]
Power basis positions (in GWh)	(8,278)
Power Basis Positions [Member] | 2014 [Member] | GWh [Member]
Volumes of Derivative FTR and basis (sales)/purchase contracts [Abstract]
Power basis positions (in GWh)	(2,628)	[9]
Power Basis Positions [Member] | Future Years [Member] | GWh [Member]
Notional amounts included under applicable contracts [Abstract]
Volumes for sales contracts that deliver in future years	(677)
Gas Basis Positions [Member] | 2012 [Member] | Bcf [Member]
Volumes of Derivative FTR and basis (sales)/purchase contracts [Abstract]
Gas basis positions (in Bcf)	2.2	[3]
Gas Basis Positions [Member] | 2013 [Member] | Bcf [Member]
Volumes of Derivative FTR and basis (sales)/purchase contracts [Abstract]
Gas basis positions (in Bcf)	(5.0)
Gas Basis Positions [Member] | 2014 [Member] | Bcf [Member]
Volumes of Derivative FTR and basis (sales)/purchase contracts [Abstract]
Gas basis positions (in Bcf)	(3.9)	[10]
Gas Basis Positions [Member] | Future Years [Member] | Bcf [Member]
Notional amounts included under applicable contracts [Abstract]
Volumes for sales contracts that deliver in future years	(5.7)
Energy Sales Contracts [Member] | 2012 [Member] | GWh [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	(5,426)	[11],[3]
Energy Sales Contracts [Member] | 2013 [Member] | Bcf [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	(10,960)	[11]
Energy Sales Contracts [Member] | 2014 [Member] | GWh [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	(5,052)	[11]
Related Energy Supply Contracts [Member] | Energy Purchases [Member] | 2012 [Member] | GWh [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	3,766	[11],[3]
Related Energy Supply Contracts [Member] | Energy Purchases [Member] | 2013 [Member] | GWh [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	6,725	[11]
Related Energy Supply Contracts [Member] | Energy Purchases [Member] | 2014 [Member] | GWh [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	2,480	[11]
Related Energy Supply Contracts [Member] | Volumetric Hedges [Member] | 2012 [Member] | GWh [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	161	[12],[3]
Related Energy Supply Contracts [Member] | Volumetric Hedges [Member] | 2013 [Member] | GWh [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	382	[12]
Related Energy Supply Contracts [Member] | Volumetric Hedges [Member] | 2014 [Member] | GWh [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	72	[12]
Related Energy Supply Contracts [Member] | Generation Supply [Member] | 2012 [Member] | GWh [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	840	[11],[3]
Related Energy Supply Contracts [Member] | Generation Supply [Member] | 2013 [Member] | GWh [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	2,986	[11]
Related Energy Supply Contracts [Member] | Generation Supply [Member] | 2014 [Member] | GWh [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	1,857	[11]
Retail Natural Gas Purchase Contracts [Member] | 2012 [Member] | Bcf [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	4.7	[3]
Retail Natural Gas Purchase Contracts [Member] | 2013 [Member] | Bcf [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	11.2
Retail Natural Gas Purchase Contracts [Member] | 2014 [Member] | Bcf [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	2.7
Retail Natural Gas Sales Contracts [Member] | 2012 [Member] | Bcf [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	(4.8)	[3]
Retail Natural Gas Sales Contracts [Member] | 2013 [Member] | Bcf [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	(11.3)
Retail Natural Gas Sales Contracts [Member] | 2014 [Member] | Bcf [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	(2.7)
Net Power Sales [Member] | 2012 [Member] | GWh [Member]
Notional amounts included under applicable contracts [Abstract]
Notional amount (in units)	(919)	[3]
Net Power Sales [Member] | 2013 [Member] | GWh [Member]
Notional amounts included under applicable contracts [Abstract]
Notional amount (in units)	(610)	[13]
Net Fuel Purchases [Member] | 2012 [Member] | Bcf [Member]
Notional amounts included under applicable contracts [Abstract]
Notional amount (in units)	11.8	[14],[3]
Net Fuel Purchases [Member] | 2013 [Member] | Bcf [Member]
Notional amounts included under applicable contracts [Abstract]
Notional amount (in units)	5.9	[13],[14]
Oil Swap [Member] | 2012 [Member] | Boe [Member]
Notional amounts included under applicable contracts [Abstract]
Notional amount (in units)	(20,000)	[3]
Oil Swap [Member] | 2013 [Member] | Boe [Member]
Notional amounts included under applicable contracts [Abstract]
Notional amount (in units)	34,000
Oil Swap [Member] | 2014 [Member] | Boe [Member]
Notional amounts included under applicable contracts [Abstract]
Notional amount (in units)	240,000	[15]
PPL Energy Supply LLC [Member]
Commodity Volumetric Activity (Numeric) [Abstract]
Number of strategies used to maximize wholesale energy portfolio value	4
Commodity Volumetric Activity - Sales of Baseload Generation (Numeric) [Abstract]
Baseload generation fleet capacity (in MW)	7,252
Commodity Volumetric Activity - Optimization of Intermediate and Peaking Generation (Numeric) [Abstract]
Intermediate and peaking generation fleet capacity (in MW)	3,256
Commodity Volumetric Activity - Proprietary Trading Activity (Numeric) [Abstract]
Insignificant or no proprietary trading positions	insignificant
PPL Energy Supply LLC [Member] | 2012 [Member] | GWh [Member]
Expected Sales, in GWh, of Baseload Generation [Abstract]
Expected sales of baseload generation (in GWh)	12,928	[1]
PPL Energy Supply LLC [Member] | 2012 [Member] | Percent Unit [Member]
Percentage Of Expected Baseload Generation Sales [Abstract]
Derivative sales, as percentage of expected baseload generation	93.00%	[2],[3]
Total power sales, as percentage of expected baseload generation	100.00%	[3],[4]
Coal fuel purchases, as percentage of expected baseload generation	105.00%	[3],[5]
Nuclear fuel purchases, as percentage of expected baseload generation	100.00%	[3],[5]
PPL Energy Supply LLC [Member] | 2013 [Member] | GWh [Member]
Expected Sales, in GWh, of Baseload Generation [Abstract]
Expected sales of baseload generation (in GWh)	49,593
PPL Energy Supply LLC [Member] | 2013 [Member] | Percent Unit [Member]
Percentage Of Expected Baseload Generation Sales [Abstract]
Derivative sales, as percentage of expected baseload generation	88.00%	[2]
Total power sales, as percentage of expected baseload generation	95.00%	[4]
Coal fuel purchases, as percentage of expected baseload generation	97.00%	[5]
Nuclear fuel purchases, as percentage of expected baseload generation	100.00%	[5]
PPL Energy Supply LLC [Member] | 2014 [Member] | GWh [Member]
Expected Sales, in GWh, of Baseload Generation [Abstract]
Expected sales of baseload generation (in GWh)	50,401
PPL Energy Supply LLC [Member] | 2014 [Member] | Percent Unit [Member]
Percentage Of Expected Baseload Generation Sales [Abstract]
Derivative sales, as percentage of expected baseload generation	50.00%	[2],[6]
Total power sales, as percentage of expected baseload generation	55.00%	[4]
Coal fuel purchases, as percentage of expected baseload generation	77.00%	[5]
Nuclear fuel purchases, as percentage of expected baseload generation	100.00%	[5]
PPL Energy Supply LLC [Member] | Future Years [Member] | GWh [Member]
Expected Sales, in GWh, of Baseload Generation [Abstract]
Expected sales of baseload generation (in GWh)	2,710
PPL Energy Supply LLC [Member] | Future Years [Member] | Bcf [Member]
Expected Sales, in GWh, of Baseload Generation [Abstract]
Expected sales of baseload generation (in GWh)	4.0
PPL Energy Supply LLC [Member] | Capacity [Member] | 2012 [Member] | MW-Months [Member]
Notional amounts included under applicable contracts [Abstract]
Notional amount (in units)	(3,098)	[7]
PPL Energy Supply LLC [Member] | Capacity [Member] | 2013 [Member] | MW-Months [Member]
Notional amounts included under applicable contracts [Abstract]
Notional amount (in units)	(5,446)	[7]
PPL Energy Supply LLC [Member] | Capacity [Member] | 2014 [Member] | MW-Months [Member]
Notional amounts included under applicable contracts [Abstract]
Notional amount (in units)	(2,078)	[7]
PPL Energy Supply LLC [Member] | Capacity [Member] | Future Years [Member] | MW-Months [Member]
Capacity Positions [Abstract]
Capacity positions that deliver in future periods (in MW-months)	989
PPL Energy Supply LLC [Member] | Financial Transmission Rights [Member] | 2012 [Member] | GWh [Member]
Volumes of Derivative FTR and basis (sales)/purchase contracts [Abstract]
FTRs (in GWh)	13,843	[3]
PPL Energy Supply LLC [Member] | Financial Transmission Rights [Member] | 2013 [Member] | GWh [Member]
Volumes of Derivative FTR and basis (sales)/purchase contracts [Abstract]
FTRs (in GWh)	21,078
PPL Energy Supply LLC [Member] | Financial Transmission Rights [Member] | 2014 [Member] | GWh [Member]
Volumes of Derivative FTR and basis (sales)/purchase contracts [Abstract]
FTRs (in GWh)	2,727	[8]
PPL Energy Supply LLC [Member] | Power Basis Positions [Member] | 2012 [Member] | GWh [Member]
Volumes of Derivative FTR and basis (sales)/purchase contracts [Abstract]
Power basis positions (in GWh)	(3,854)	[3]
PPL Energy Supply LLC [Member] | Power Basis Positions [Member] | 2013 [Member] | GWh [Member]
Volumes of Derivative FTR and basis (sales)/purchase contracts [Abstract]
Power basis positions (in GWh)	(8,278)
PPL Energy Supply LLC [Member] | Power Basis Positions [Member] | 2014 [Member] | GWh [Member]
Volumes of Derivative FTR and basis (sales)/purchase contracts [Abstract]
Power basis positions (in GWh)	(2,628)	[9]
PPL Energy Supply LLC [Member] | Power Basis Positions [Member] | Future Years [Member] | GWh [Member]
Notional amounts included under applicable contracts [Abstract]
Volumes for sales contracts that deliver in future years	(677)
PPL Energy Supply LLC [Member] | Gas Basis Positions [Member] | 2012 [Member] | Bcf [Member]
Volumes of Derivative FTR and basis (sales)/purchase contracts [Abstract]
Gas basis positions (in Bcf)	2.2	[3]
PPL Energy Supply LLC [Member] | Gas Basis Positions [Member] | 2013 [Member] | Bcf [Member]
Volumes of Derivative FTR and basis (sales)/purchase contracts [Abstract]
Gas basis positions (in Bcf)	(5.0)
PPL Energy Supply LLC [Member] | Gas Basis Positions [Member] | 2014 [Member] | Bcf [Member]
Volumes of Derivative FTR and basis (sales)/purchase contracts [Abstract]
Gas basis positions (in Bcf)	(3.9)	[10]
PPL Energy Supply LLC [Member] | Gas Basis Positions [Member] | Future Years [Member] | Bcf [Member]
Notional amounts included under applicable contracts [Abstract]
Volumes for sales contracts that deliver in future years	(5.7)
PPL Energy Supply LLC [Member] | Energy Sales Contracts [Member] | 2012 [Member] | GWh [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	(5,426)	[11],[3]
PPL Energy Supply LLC [Member] | Energy Sales Contracts [Member] | 2013 [Member] | GWh [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	(10,960)	[11]
PPL Energy Supply LLC [Member] | Energy Sales Contracts [Member] | 2014 [Member] | GWh [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	(5,052)	[11]
PPL Energy Supply LLC [Member] | Related Energy Supply Contracts [Member] | Energy Purchases [Member] | 2012 [Member] | GWh [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	3,766	[11],[3]
PPL Energy Supply LLC [Member] | Related Energy Supply Contracts [Member] | Energy Purchases [Member] | 2013 [Member] | GWh [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	6,725	[11]
PPL Energy Supply LLC [Member] | Related Energy Supply Contracts [Member] | Energy Purchases [Member] | 2014 [Member] | GWh [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	2,480	[11]
PPL Energy Supply LLC [Member] | Related Energy Supply Contracts [Member] | Volumetric Hedges [Member] | 2012 [Member] | GWh [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	161	[12],[3]
PPL Energy Supply LLC [Member] | Related Energy Supply Contracts [Member] | Volumetric Hedges [Member] | 2013 [Member] | GWh [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	382	[12]
PPL Energy Supply LLC [Member] | Related Energy Supply Contracts [Member] | Volumetric Hedges [Member] | 2014 [Member] | GWh [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	72	[12]
PPL Energy Supply LLC [Member] | Related Energy Supply Contracts [Member] | Generation Supply [Member] | 2012 [Member] | GWh [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	840	[11],[3]
PPL Energy Supply LLC [Member] | Related Energy Supply Contracts [Member] | Generation Supply [Member] | 2013 [Member] | GWh [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	2,986	[11]
PPL Energy Supply LLC [Member] | Related Energy Supply Contracts [Member] | Generation Supply [Member] | 2014 [Member] | GWh [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	1,857	[11]
PPL Energy Supply LLC [Member] | Retail Natural Gas Purchase Contracts [Member] | 2012 [Member] | Bcf [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	4.7	[3]
PPL Energy Supply LLC [Member] | Retail Natural Gas Purchase Contracts [Member] | 2013 [Member] | Bcf [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	11.2
PPL Energy Supply LLC [Member] | Retail Natural Gas Purchase Contracts [Member] | 2014 [Member] | Bcf [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	2.7
PPL Energy Supply LLC [Member] | Retail Natural Gas Sales Contracts [Member] | 2012 [Member] | Bcf [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	(4.8)	[3]
PPL Energy Supply LLC [Member] | Retail Natural Gas Sales Contracts [Member] | 2013 [Member] | Bcf [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	(11.3)
PPL Energy Supply LLC [Member] | Retail Natural Gas Sales Contracts [Member] | 2014 [Member] | Bcf [Member]
Volumes of (Sales)/Purchase Contracts, Excluding FTRs, Renewable Energy Credits, Basis and Capacity Contracts [Abstract]
Net volumes for derivative contracts, excluding contracts that qualify for NPNS, that deliver in 2013 (in units)	(2.7)
PPL Energy Supply LLC [Member] | Net Power Sales [Member] | 2012 [Member]
Notional amounts included under applicable contracts [Abstract]
Notional amount (in units)	(919)	[3]
PPL Energy Supply LLC [Member] | Net Power Sales [Member] | 2013 [Member] | GWh [Member]
Notional amounts included under applicable contracts [Abstract]
Notional amount (in units)	(610)	[13]
PPL Energy Supply LLC [Member] | Net Fuel Purchases [Member] | 2012 [Member] | Bcf [Member]
Notional amounts included under applicable contracts [Abstract]
Notional amount (in units)	11.8	[14],[3]
PPL Energy Supply LLC [Member] | Net Fuel Purchases [Member] | 2013 [Member] | Bcf [Member]
Notional amounts included under applicable contracts [Abstract]
Notional amount (in units)	5.9	[13],[14]
PPL Energy Supply LLC [Member] | Oil Swap [Member] | 2012 [Member] | Boe [Member]
Notional amounts included under applicable contracts [Abstract]
Notional amount (in units)	(20,000)	[3]
PPL Energy Supply LLC [Member] | Oil Swap [Member] | 2013 [Member] | Boe [Member]
Notional amounts included under applicable contracts [Abstract]
Notional amount (in units)	34,000
PPL Energy Supply LLC [Member] | Oil Swap [Member] | 2014 [Member] | Boe [Member]
Notional amounts included under applicable contracts [Abstract]
Notional amount (in units)	240,000	[15]

[1] Represents expected sales for the balance of the current year.

[2] Excludes non-derivative contracts and contracts that qualify for NPNS. Volumes for option contracts factor in the probability of an option being exercised and may be less than the notional amount of the option.

[3] Represents the balance of the current year.

[4] Amount represents derivative (including contracts that qualify for NPNS) and non-derivative contracts. Volumes for option contracts factor in the probability of an option being exercised and may be less than the notional amount of the option. Percentages are based on fixed-price contracts only.

[5] Coal and nuclear contracts receive accrual accounting treatment, as they are not derivative contracts. Percentages are based on both fixed- and variable-priced contracts.

[6] Volumes for derivative sales contracts that deliver in future periods total 2,710 GWh and 4.0 Bcf.

[7] Net volumes that deliver in future periods are 989 MW-months.

[8] Net volumes that deliver in future periods are 1,062 GWh.

[9] Net volumes that deliver in future periods are (677) GWh.

[10] Net volumes that deliver in future periods are (5.7) Bcf.

[11] Includes contracts that are not derivatives and/or contracts that are NPNS, which receive accrual accounting.

[12] PPL Energy Supply uses power and gas options, swaps and futures to hedge the volumetric risk associated with sales contracts since the demand for power varies hourly. Volumes for option contracts factor in the probability of an option being exercised and may be less than the notional amount of the option.

[13] Volumes for derivative contracts used in support of these strategies that deliver in future periods are insignificant.

[14] Included in these volumes are non-options and exercised option contracts that converted to non-option derivative contracts. Volumes associated with option contracts are insignificant.

[15] Net volumes that deliver in future periods are 480 bbls.