Fair Value Measurements and Credit Concentration (Net Assets and Liabilities Measured on Recurring and Nonrecurring Basis Level 3 Significant Unobservable Inputs) (Details) (Level 3 [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Recurring [Member] | Energy Commodities, Net [Member] | Retail Natural Gas Sales Contracts [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair value of net asset and (liability)	$ 36	[1]	$ 24	[1]
Recurring [Member] | Energy Commodities, Net [Member] | Retail Natural Gas Sales Contracts [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Inputs [Abstract]
Observable wholesale prices used as proxy for retail delivery points	100.00%	[2]	100.00%	[2]
Recurring [Member] | Energy Commodities, Net [Member] | Retail Natural Gas Sales Contracts [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Inputs [Abstract]
Observable wholesale prices used as proxy for retail delivery points	10.00%	[2]	21.00%	[2]
Recurring [Member] | Energy Commodities, Net [Member] | Retail Natural Gas Sales Contracts [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Fair Value Inputs [Abstract]
Observable wholesale prices used as proxy for retail delivery points	86.00%	[2]	75.00%	[2]
Recurring [Member] | Energy Commodities, Net [Member] | Power Sales Contracts [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair value of net asset and (liability)			(4)	[3]
Recurring [Member] | Energy Commodities, Net [Member] | Power Sales Contracts [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Inputs [Abstract]
Proprietary model used to calculate forward basis prices			24.00%	[2]
Recurring [Member] | Energy Commodities, Net [Member] | Power Sales Contracts [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Inputs [Abstract]
Proprietary model used to calculate forward basis prices			24.00%	[2]
Recurring [Member] | Energy Commodities, Net [Member] | Power Sales Contracts [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Fair Value Inputs [Abstract]
Proprietary model used to calculate forward basis prices			24.00%	[2]
Recurring [Member] | Energy Commodities, Net [Member] | Financial Transmission Rights Purchase Contracts [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair value of net asset and (liability)			2	[4]
Recurring [Member] | Energy Commodities, Net [Member] | Financial Transmission Rights Purchase Contracts [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Inputs [Abstract]
Historical settled prices used to model forward prices			100.00%	[2]
Recurring [Member] | Energy Commodities, Net [Member] | Financial Transmission Rights Purchase Contracts [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Inputs [Abstract]
Historical settled prices used to model forward prices			100.00%	[2]
Recurring [Member] | Energy Commodities, Net [Member] | Financial Transmission Rights Purchase Contracts [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Fair Value Inputs [Abstract]
Historical settled prices used to model forward prices			100.00%	[2]
Recurring [Member] | Energy Commodities, Net [Member] | Full Requirement Sales Contracts [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair value of net asset and (liability)	(12)	[5]
Recurring [Member] | Energy Commodities, Net [Member] | Full Requirement Sales Contracts [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Inputs [Abstract]
Proprietary model	100.00%	[5]
Recurring [Member] | Energy Commodities, Net [Member] | Full Requirement Sales Contracts [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Inputs [Abstract]
Proprietary model	100.00%	[5]
Recurring [Member] | Energy Commodities, Net [Member] | Full Requirement Sales Contracts [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Fair Value Inputs [Abstract]
Proprietary model	100.00%	[5]
Recurring [Member] | Auction Rate Securities [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair value of net asset and (liability)	19	[6]	16	[6]
Recurring [Member] | Auction Rate Securities [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Inputs [Abstract]
Modeled from SIFMA Index	80.00%	[2]	74.00%	[2]
Recurring [Member] | Auction Rate Securities [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Inputs [Abstract]
Modeled from SIFMA Index	10.00%	[2]	54.00%	[2]
Recurring [Member] | Auction Rate Securities [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Fair Value Inputs [Abstract]
Modeled from SIFMA Index	63.00%	[2]	64.00%	[2]
Recurring [Member] | Cross Currency Swaps [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair value of net asset and (liability)			1	[7]
Recurring [Member] | Cross Currency Swaps [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Inputs [Abstract]
Credit valuation adjustment			22.00%	[2]
Recurring [Member] | Cross Currency Swaps [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Inputs [Abstract]
Credit valuation adjustment			22.00%	[2]
Recurring [Member] | Cross Currency Swaps [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Fair Value Inputs [Abstract]
Credit valuation adjustment			22.00%	[2]
Nonrecurring [Member] | Equity Investment In Electric Energy Incorporated [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair value of net asset and (liability)
Nonrecurring [Member] | Equity Investment In Electric Energy Incorporated [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Inputs [Abstract]
Long term forward price curves and capital expenditure projections			100.00%
Nonrecurring [Member] | Equity Investment In Electric Energy Incorporated [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Inputs [Abstract]
Long term forward price curves and capital expenditure projections			100.00%
Nonrecurring [Member] | Equity Investment In Electric Energy Incorporated [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Fair Value Inputs [Abstract]
Long term forward price curves and capital expenditure projections			100.00%
Nonrecurring [Member] | Corette Plant And Emission Allowances [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair value of net asset and (liability)
Nonrecurring [Member] | Corette Plant And Emission Allowances [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Inputs [Abstract]
Long term forward price curves and capital expenditure projections	100.00%
Nonrecurring [Member] | Corette Plant And Emission Allowances [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Inputs [Abstract]
Long term forward price curves and capital expenditure projections	100.00%
Nonrecurring [Member] | Corette Plant And Emission Allowances [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Fair Value Inputs [Abstract]
Long term forward price curves and capital expenditure projections	100.00%
PPL Energy Supply LLC [Member] | Recurring [Member] | Energy Commodities, Net [Member] | Retail Natural Gas Sales Contracts [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair value of net asset and (liability)	36	[1]	24	[1]
PPL Energy Supply LLC [Member] | Recurring [Member] | Energy Commodities, Net [Member] | Retail Natural Gas Sales Contracts [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Inputs [Abstract]
Observable wholesale prices used as proxy for retail delivery points	100.00%	[2]	100.00%	[2]
PPL Energy Supply LLC [Member] | Recurring [Member] | Energy Commodities, Net [Member] | Retail Natural Gas Sales Contracts [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Inputs [Abstract]
Observable wholesale prices used as proxy for retail delivery points	10.00%	[2]	21.00%	[2]
PPL Energy Supply LLC [Member] | Recurring [Member] | Energy Commodities, Net [Member] | Retail Natural Gas Sales Contracts [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Fair Value Inputs [Abstract]
Observable wholesale prices used as proxy for retail delivery points	86.00%	[2]	75.00%	[2]
PPL Energy Supply LLC [Member] | Recurring [Member] | Energy Commodities, Net [Member] | Power Sales Contracts [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair value of net asset and (liability)			(4)	[3]
PPL Energy Supply LLC [Member] | Recurring [Member] | Energy Commodities, Net [Member] | Power Sales Contracts [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Inputs [Abstract]
Proprietary model used to calculate forward basis prices			24.00%	[2]
PPL Energy Supply LLC [Member] | Recurring [Member] | Energy Commodities, Net [Member] | Power Sales Contracts [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Inputs [Abstract]
Proprietary model used to calculate forward basis prices			24.00%	[2]
PPL Energy Supply LLC [Member] | Recurring [Member] | Energy Commodities, Net [Member] | Power Sales Contracts [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Fair Value Inputs [Abstract]
Proprietary model used to calculate forward basis prices			24.00%	[2]
PPL Energy Supply LLC [Member] | Recurring [Member] | Energy Commodities, Net [Member] | Financial Transmission Rights Purchase Contracts [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair value of net asset and (liability)			2	[4]
PPL Energy Supply LLC [Member] | Recurring [Member] | Energy Commodities, Net [Member] | Financial Transmission Rights Purchase Contracts [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Inputs [Abstract]
Historical settled prices used to model forward prices			100.00%	[2]
PPL Energy Supply LLC [Member] | Recurring [Member] | Energy Commodities, Net [Member] | Financial Transmission Rights Purchase Contracts [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Inputs [Abstract]
Historical settled prices used to model forward prices			100.00%	[2]
PPL Energy Supply LLC [Member] | Recurring [Member] | Energy Commodities, Net [Member] | Financial Transmission Rights Purchase Contracts [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Fair Value Inputs [Abstract]
Historical settled prices used to model forward prices			100.00%	[2]
PPL Energy Supply LLC [Member] | Recurring [Member] | Energy Commodities, Net [Member] | Full Requirement Sales Contracts [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair value of net asset and (liability)	(12)	[5]
PPL Energy Supply LLC [Member] | Recurring [Member] | Energy Commodities, Net [Member] | Full Requirement Sales Contracts [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Inputs [Abstract]
Proprietary model	100.00%	[5]
PPL Energy Supply LLC [Member] | Recurring [Member] | Energy Commodities, Net [Member] | Full Requirement Sales Contracts [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Inputs [Abstract]
Proprietary model	100.00%	[5]
PPL Energy Supply LLC [Member] | Recurring [Member] | Energy Commodities, Net [Member] | Full Requirement Sales Contracts [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Fair Value Inputs [Abstract]
Proprietary model	100.00%	[5]
PPL Energy Supply LLC [Member] | Recurring [Member] | Auction Rate Securities [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair value of net asset and (liability)	16	[6]	13	[6]
PPL Energy Supply LLC [Member] | Recurring [Member] | Auction Rate Securities [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Inputs [Abstract]
Modeled from SIFMA Index	80.00%	[2]	74.00%	[2]
PPL Energy Supply LLC [Member] | Recurring [Member] | Auction Rate Securities [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Inputs [Abstract]
Modeled from SIFMA Index	10.00%	[2]	57.00%	[2]
PPL Energy Supply LLC [Member] | Recurring [Member] | Auction Rate Securities [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Fair Value Inputs [Abstract]
Modeled from SIFMA Index	63.00%	[2]	65.00%	[2]
PPL Energy Supply LLC [Member] | Nonrecurring [Member] | Corette Plant And Emission Allowances [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair value of net asset and (liability)
PPL Energy Supply LLC [Member] | Nonrecurring [Member] | Corette Plant And Emission Allowances [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Inputs [Abstract]
Long term forward price curves and capital expenditure projections	100.00%
PPL Energy Supply LLC [Member] | Nonrecurring [Member] | Corette Plant And Emission Allowances [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Inputs [Abstract]
Long term forward price curves and capital expenditure projections	100.00%
PPL Energy Supply LLC [Member] | Nonrecurring [Member] | Corette Plant And Emission Allowances [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Fair Value Inputs [Abstract]
Long term forward price curves and capital expenditure projections	100.00%
LG And E And KU Energy LLC [Member] | Nonrecurring [Member] | Equity Investment In Electric Energy Incorporated [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair value of net asset and (liability)
LG And E And KU Energy LLC [Member] | Nonrecurring [Member] | Equity Investment In Electric Energy Incorporated [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Inputs [Abstract]
Long term forward price curves and capital expenditure projections			100.00%
LG And E And KU Energy LLC [Member] | Nonrecurring [Member] | Equity Investment In Electric Energy Incorporated [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Inputs [Abstract]
Long term forward price curves and capital expenditure projections			100.00%
LG And E And KU Energy LLC [Member] | Nonrecurring [Member] | Equity Investment In Electric Energy Incorporated [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Fair Value Inputs [Abstract]
Long term forward price curves and capital expenditure projections			100.00%
Kentucky Utilities Co [Member] | Nonrecurring [Member] | Equity Investment In Electric Energy Incorporated [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair value of net asset and (liability)
Kentucky Utilities Co [Member] | Nonrecurring [Member] | Equity Investment In Electric Energy Incorporated [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Inputs [Abstract]
Long term forward price curves and capital expenditure projections			100.00%
Kentucky Utilities Co [Member] | Nonrecurring [Member] | Equity Investment In Electric Energy Incorporated [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Inputs [Abstract]
Long term forward price curves and capital expenditure projections			100.00%
Kentucky Utilities Co [Member] | Nonrecurring [Member] | Equity Investment In Electric Energy Incorporated [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Fair Value Inputs [Abstract]
Long term forward price curves and capital expenditure projections			100.00%

[1] As the forward price of natural gas increases/(decreases), the fair value of contracts (decreases)/increases.

[2] For energy commodities and auction rate securities, the range and weighted average represent the percentage of fair value derived from the unobservable inputs. For cross-currency swaps, the range and weighted average represent the percentage decrease in fair value due to the unobservable inputs used in the model to calculate the credit valuation adjustment.

[3] As the forward price of basis increases/(decreases), the fair value of contracts (decreases)/increases.

[4] As the forward implied spread increases/(decreases), the fair value of contracts increases/(decreases).

[5] As forward market prices increase/(decrease), the fair value of contracts (decreases)/increases. As the volumetric assumptions for full-requirement sales contracts in a gain position increase/(decrease), the fair value of contracts increases/(decreases). As the volumetric assumptions for full-requirement sales contracts in a loss position increase/(decrease), the fair value of contracts (decreases)/increases.

[6] The model used to calculate fair value incorporates an assumption that the auctions will continue to fail. As the modeled forward rates of the SIFMA Index increase/(decrease), the fair value of the securities increases/(decreases).

[7] The credit valuation adjustment incorporates projected probabilities of default and estimated recovery rates. As the credit valuation adjustment increases/(decreases), the fair value of the swaps (decreases)/increases.