Discontinued Operations (Effective Portion Of The Gain Or Loss On The Derivative Is Reported As A Component Of Accumulated Other Comprehensive Loss) (Details) (USD $) In Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010		Jun. 30, 2011	Jun. 30, 2010
Amount of net pre-tax loss arising during the period included in accumulated other comprehensive loss	$ 3	$ 12		$ 2	$ (78)
Effective portion, loss from discontinued operations, net of income taxes	19	39		46	85
Ineffective portion, loss from discontinued operations, net of income taxes		(1)	[1],[2]		2	[1],[2]
Total net pre-tax loss reclassified into income	19	38		46	87
Net pre-tax loss on commodity derivatives included in other comprehensive loss comprehensive loss	22	50		48	9
Conectiv Energy [Member]
Amount of net pre-tax loss arising during the period included in accumulated other comprehensive loss		44			(74)
Effective portion, loss from discontinued operations, net of income taxes		61			106
Ineffective portion, loss from discontinued operations, net of income taxes		84	[3],[4]		87	[3],[4]
Total net pre-tax loss reclassified into income		145			193
Net pre-tax loss on commodity derivatives included in other comprehensive loss comprehensive loss		189			119
Reclassified from AOCL to income because the forecasted transactions	$ 0	$ 87		$ 0	$ 88

[1] For the six months ended June 30, 2011 and 2010, amounts of zero and less than $1 million, respectively, were reclassified from AOCL to income because the forecasted hedged transactions were deemed probable not to occur.

[2] For the three months ended June 30, 2011 and 2010, amounts of zero and less than $1 million, respectively, were reclassified from AOCL to income because the forecasted hedged transactions were deemed probable not to occur.

[3] For the six months ended June 30, 2011 and 2010, amounts of zero and $88 million, respectively, were reclassified from AOCL to income because the forecasted transactions were deemed probable not to occur.

[4] For the three months ended June 30, 2011 and 2010, amounts of zero and $87 million, respectively, were reclassified from AOCL to income because the forecasted transactions were deemed probable not to occur.