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Acquisitions, Divestitures and Discontinued Operations (Textuals) (Details) (USD $)
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12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | |||||||||||||
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Dec. 31, 2012
MW
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Dec. 31, 2011
MW
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Dec. 31, 2010
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Dec. 08, 2010
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Dec. 31, 2012
Bosque Energy Center [Member]
MW
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Dec. 31, 2011
Conectiv [Member]
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Mar. 02, 2011
Conectiv [Member]
MW
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Jul. 02, 2010
Conectiv [Member]
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Dec. 08, 2010
Broad River and South Point [Member]
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Dec. 08, 2010
Broad River [Member]
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Dec. 08, 2010
South Point [Member]
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Dec. 31, 2012
Riverside Energy Center [Member]
MW
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Dec. 31, 2012
Broad River Energy Center [Member]
MW
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Dec. 27, 2012
Broad River Energy Center [Member]
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Dec. 31, 2010
Blue Spruce and Rock Mountain [Member]
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Dec. 06, 2010
Blue Spruce and Rock Mountain [Member]
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Dec. 31, 2010
Freestone Energy Center [Member]
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Dec. 08, 2010
Freestone Energy Center [Member]
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| Business Acquisition [Line Items] | ||||||||||||||||||
| Undivided Interest Percentage In Power Plant Asset | 25.00% | |||||||||||||||||
| Cash Proceeds From Sale Of Undivided Interest In Power Plant Assets | $ 215,000,000 | |||||||||||||||||
| Business Acquisition, Preexisting Relationship, Gain (Loss) Recognized | 125,000,000 | 125,000,000 | ||||||||||||||||
| Business Acquisition, Purchase Price Allocation, Notes Payable and Long-term Debt | 297,000,000 | |||||||||||||||||
| Variable Interest Entity, Financial or Other Support, Amount | 20,000,000 | 87,000,000 | 46,000,000 | 110,000,000 | ||||||||||||||
| Power generation capacity | 8,255 | 11,391 | 800 | 4,491 | 603 | 847 | ||||||||||||
| Business Acquisition, Purchase Price Allocation, Assets Acquired | 432,000,000 | |||||||||||||||||
| Number of Power Plants Acquired | 18 | |||||||||||||||||
| Block one power generation capacity | 250 | |||||||||||||||||
| Block two power generation capacity | 550 | |||||||||||||||||
| Cap on Environmental Remediation Liabilities Acquired | 10,000,000 | |||||||||||||||||
| Number of Employees Acquired In Acquisition | 130 | |||||||||||||||||
| Number Of Employees For Which Pension Obligation Was Reduced | 31 | |||||||||||||||||
| Proceeds from Subsidiary Project Debt | 1,300,000,000 | |||||||||||||||||
| Business Acquisition, Cost of Acquired Entity, Purchase Price | 1,640,000,000 | |||||||||||||||||
| Business Acquisition, Cost of Acquired Entity, Cash Paid | 40,000,000 | |||||||||||||||||
| Business Acquisition, Purchase Price Allocation, Liabilities Assumed | 85,000,000 | |||||||||||||||||
| Debt Eliminated In Acquisition | 212,000,000 | |||||||||||||||||
| Debt Extinguishment Costs Due To Acquisition | 30,000,000 | 30,000,000 | ||||||||||||||||
| Impairment Loss Due To Acquisition | 95,000,000 | 95,000,000 | ||||||||||||||||
| Proceeds from Sale of Productive Assets | 402,000,000 | 423,000,000 | 739,000,000 | |||||||||||||||
| Gain (Loss) on Disposition of Assets | 222,000,000 | 0 | 119,000,000 | 7,000,000 | 215,000,000 | 119,000,000 | ||||||||||||
| Ownership percentage before divestiture of business | 100.00% | 100.00% | ||||||||||||||||
| Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal | $ 209,000,000 | $ 209,000,000 | ||||||||||||||||