Fair Value Measurements and Credit Concentration (Net Assets and Liabilities Measured on Recurring Basis Level 3 Significant Unobservable Inputs) (Details) (Level 3 [Member], USD $)
In Millions, unless otherwise specified |
6 Months Ended | 12 Months Ended | ||||||||||||||||
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Jun. 30, 2014
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Dec. 31, 2013
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Recurring [Member] | Energy Commodities, Net [Member] | Natural Gas Contracts [Member]
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Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||||||||||||||||||
Fair value of net asset and (liability) | $ 7 | [1] | $ 36 | [1] | ||||||||||||||
Recurring [Member] | Energy Commodities, Net [Member] | Natural Gas Contracts [Member] | Discounted Cash Flow [Member] | Maximum [Member]
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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] | Natural Gas Contracts [Member] | Discounted Cash Flow [Member] | Minimum [Member]
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Fair Value Inputs [Abstract] | ||||||||||||||||||
Observable wholesale prices used as proxy for retail delivery points | 14.00% | [2] | 10.00% | [2] | ||||||||||||||
Recurring [Member] | Energy Commodities, Net [Member] | Natural Gas Contracts [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
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Fair Value Inputs [Abstract] | ||||||||||||||||||
Observable wholesale prices used as proxy for retail delivery points | 35.00% | [2] | 86.00% | [2] | ||||||||||||||
Recurring [Member] | Energy Commodities, Net [Member] | Power Sales Contracts [Member]
|
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Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||||||||||||||||||
Fair value of net asset and (liability) | (63) | [3] | (12) | [3] | ||||||||||||||
Recurring [Member] | Energy Commodities, Net [Member] | Power Sales Contracts [Member] | Discounted Cash Flow [Member] | Maximum [Member]
|
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Fair Value Inputs [Abstract] | ||||||||||||||||||
Proprietary model used to calculate forward prices | 100.00% | [2] | 100.00% | [2] | ||||||||||||||
Recurring [Member] | Energy Commodities, Net [Member] | Power Sales Contracts [Member] | Discounted Cash Flow [Member] | Minimum [Member]
|
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Fair Value Inputs [Abstract] | ||||||||||||||||||
Proprietary model used to calculate forward prices | 14.00% | [2] | 100.00% | [2] | ||||||||||||||
Recurring [Member] | Energy Commodities, Net [Member] | Power Sales Contracts [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
|
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Fair Value Inputs [Abstract] | ||||||||||||||||||
Proprietary model used to calculate forward prices | 79.00% | [2] | 100.00% | [2] | ||||||||||||||
Recurring [Member] | Energy Commodities, Net [Member] | Financial Transmission Rights Purchase Contracts [Member]
|
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Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||||||||||||||||||
Fair value of net asset and (liability) | 6 | [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] | Heat Rate Option [Member]
|
||||||||||||||||||
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||||||||||||||||||
Fair value of net asset and (liability) | 124 | [5] | ||||||||||||||||
Recurring [Member] | Energy Commodities, Net [Member] | Heat Rate Option [Member] | Discounted Cash Flow [Member] | Maximum [Member]
|
||||||||||||||||||
Fair Value Inputs [Abstract] | ||||||||||||||||||
Implied correlation, implied volatility, and market implied heat rate | 100.00% | [2] | ||||||||||||||||
Recurring [Member] | Energy Commodities, Net [Member] | Heat Rate Option [Member] | Discounted Cash Flow [Member] | Minimum [Member]
|
||||||||||||||||||
Fair Value Inputs [Abstract] | ||||||||||||||||||
Implied correlation, implied volatility, and market implied heat rate | 22.00% | [2] | ||||||||||||||||
Recurring [Member] | Energy Commodities, Net [Member] | Heat Rate Option [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
|
||||||||||||||||||
Fair Value Inputs [Abstract] | ||||||||||||||||||
Implied correlation, implied volatility, and market implied heat rate | 44.00% | [2] | ||||||||||||||||
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] | 19 | [6] | ||||||||||||||
Recurring [Member] | Auction Rate Securities [Member] | Discounted Cash Flow [Member] | Maximum [Member]
|
||||||||||||||||||
Fair Value Inputs [Abstract] | ||||||||||||||||||
Modeled from SIFMA Index | 75.00% | [2] | 80.00% | [2] | ||||||||||||||
Recurring [Member] | Auction Rate Securities [Member] | Discounted Cash Flow [Member] | Minimum [Member]
|
||||||||||||||||||
Fair Value Inputs [Abstract] | ||||||||||||||||||
Modeled from SIFMA Index | 58.00% | [2] | 10.00% | [2] | ||||||||||||||
Recurring [Member] | Auction Rate Securities [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
|
||||||||||||||||||
Fair Value Inputs [Abstract] | ||||||||||||||||||
Modeled from SIFMA Index | 67.00% | [2] | 63.00% | [2] | ||||||||||||||
Nonrecurring [Member] | Kerr Dam Project [Member]
|
||||||||||||||||||
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||||||||||||||||||
Fair value of net asset and (liability) | 29 | |||||||||||||||||
Nonrecurring [Member] | Kerr Dam Project [Member] | Discounted Cash Flow [Member] | Maximum [Member]
|
||||||||||||||||||
Fair Value Inputs [Abstract] | ||||||||||||||||||
Proprietary Model Used To Calculate Plant Value | 38.00% | [7] | ||||||||||||||||
Nonrecurring [Member] | Kerr Dam Project [Member] | Discounted Cash Flow [Member] | Minimum [Member]
|
||||||||||||||||||
Fair Value Inputs [Abstract] | ||||||||||||||||||
Proprietary Model Used To Calculate Plant Value | 38.00% | [7] | ||||||||||||||||
Nonrecurring [Member] | Kerr Dam Project [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
|
||||||||||||||||||
Fair Value Inputs [Abstract] | ||||||||||||||||||
Proprietary Model Used To Calculate Plant Value | 38.00% | [7] | ||||||||||||||||
PPL Energy Supply LLC [Member] | Recurring [Member] | Energy Commodities, Net [Member] | Natural Gas Contracts [Member]
|
||||||||||||||||||
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||||||||||||||||||
Fair value of net asset and (liability) | 7 | [1] | 36 | [1] | ||||||||||||||
PPL Energy Supply LLC [Member] | Recurring [Member] | Energy Commodities, Net [Member] | Natural Gas 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] | Natural Gas Contracts [Member] | Discounted Cash Flow [Member] | Minimum [Member]
|
||||||||||||||||||
Fair Value Inputs [Abstract] | ||||||||||||||||||
Observable wholesale prices used as proxy for retail delivery points | 14.00% | [2] | 10.00% | [2] | ||||||||||||||
PPL Energy Supply LLC [Member] | Recurring [Member] | Energy Commodities, Net [Member] | Natural Gas Contracts [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
|
||||||||||||||||||
Fair Value Inputs [Abstract] | ||||||||||||||||||
Observable wholesale prices used as proxy for retail delivery points | 35.00% | [2] | 86.00% | [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) | (63) | [3] | (12) | [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 prices | 100.00% | [2] | 100.00% | [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 prices | 14.00% | [2] | 100.00% | [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 prices | 79.00% | [2] | 100.00% | [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) | 6 | [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] | Heat Rate Option [Member]
|
||||||||||||||||||
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||||||||||||||||||
Fair value of net asset and (liability) | 124 | [5] | ||||||||||||||||
PPL Energy Supply LLC [Member] | Recurring [Member] | Energy Commodities, Net [Member] | Heat Rate Option [Member] | Discounted Cash Flow [Member] | Maximum [Member]
|
||||||||||||||||||
Fair Value Inputs [Abstract] | ||||||||||||||||||
Implied correlation, implied volatility, and market implied heat rate | 100.00% | [2] | ||||||||||||||||
PPL Energy Supply LLC [Member] | Recurring [Member] | Energy Commodities, Net [Member] | Heat Rate Option [Member] | Discounted Cash Flow [Member] | Minimum [Member]
|
||||||||||||||||||
Fair Value Inputs [Abstract] | ||||||||||||||||||
Implied correlation, implied volatility, and market implied heat rate | 22.00% | [2] | ||||||||||||||||
PPL Energy Supply LLC [Member] | Recurring [Member] | Energy Commodities, Net [Member] | Heat Rate Option [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
|
||||||||||||||||||
Fair Value Inputs [Abstract] | ||||||||||||||||||
Implied correlation, implied volatility, and market implied heat rate | 44.00% | [2] | ||||||||||||||||
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) | 13 | [6] | 16 | [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 | 75.00% | [2] | 80.00% | [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 | 59.00% | [2] | 10.00% | [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 | 68.00% | [2] | 63.00% | [2] | ||||||||||||||
PPL Energy Supply LLC [Member] | Nonrecurring [Member] | Kerr Dam Project [Member]
|
||||||||||||||||||
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||||||||||||||||||
Fair value of net asset and (liability) | $ 29 | |||||||||||||||||
PPL Energy Supply LLC [Member] | Nonrecurring [Member] | Kerr Dam Project [Member] | Discounted Cash Flow [Member] | Maximum [Member]
|
||||||||||||||||||
Fair Value Inputs [Abstract] | ||||||||||||||||||
Proprietary Model Used To Calculate Plant Value | 38.00% | [7] | ||||||||||||||||
PPL Energy Supply LLC [Member] | Nonrecurring [Member] | Kerr Dam Project [Member] | Discounted Cash Flow [Member] | Minimum [Member]
|
||||||||||||||||||
Fair Value Inputs [Abstract] | ||||||||||||||||||
Proprietary Model Used To Calculate Plant Value | 38.00% | [7] | ||||||||||||||||
PPL Energy Supply LLC [Member] | Nonrecurring [Member] | Kerr Dam Project [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
|
||||||||||||||||||
Fair Value Inputs [Abstract] | ||||||||||||||||||
Proprietary Model Used To Calculate Plant Value | 38.00% | [7] | ||||||||||||||||
|