v2.4.0.6
Acquisitions, Divestitures and Discontinued Operations (Details) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 08, 2010
Jul. 02, 2010
Dec. 31, 2011
Conectiv [Member]
Mar. 02, 2011
Conectiv [Member]
Business Acquisition, Purchase Price Allocation [Abstract]            
Consideration       $ 1,640,000,000    
Assets:            
Current assets       78,000,000    
Property, plant and equipment, net       1,574,000,000    
Other long-term assets       85,000,000    
Total assets acquired       1,737,000,000    
Liabilities:            
Current liabilities       46,000,000    
Long-term liabilities       51,000,000    
Total liabilities assumed     85,000,000 97,000,000    
Net assets acquired       1,640,000,000    
Number of Power Plants Acquired       18    
Power generation capacity 11,391 13,656       4,491
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    
Variable Interest Entity, Financial or Other Support, Amount $ 171,000,000 $ 46,000,000     $ 110,000,000