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Discontinued Operations (Operating Results) (Details) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
(Loss) income from discontinued operations, net of income taxes $ (1) $ (130) $ 1 $ (122)
Conectiv Energy [Member]
       
(Loss) income from operations of discontinued operations, net of income taxes (2) 2 1 8
Net gains (losses) from dispositions of assets and businesses of discontinued operations, net of income taxes 1 (132)   (130)
(Loss) income from discontinued operations, net of income taxes $ (1) $ (130) $ 1 $ (122)