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, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Amount of net pre-tax loss arising during the period included in accumulated other comprehensive loss			$ (100)		$ (129)
Effective portion, loss from discontinued operations, net of income taxes	80		135		164
Ineffective portion, loss from discontinued operations, net of income taxes	1	[1]			2	[1]
Total net pre-tax loss reclassified into income	(81)		(135)		(166)
Net pre-tax loss on commodity derivatives included in other comprehensive loss	81		35		37
Conectiv Energy [Member]
Amount of net pre-tax loss arising during the period included in accumulated other comprehensive loss			(73)		(216)
Effective portion, loss from discontinued operations, net of income taxes			(164)		(224)
Ineffective portion, loss from discontinued operations, net of income taxes			(82)	[2]		[2]
Total net pre-tax loss reclassified into income			246		224
Net pre-tax loss on commodity derivatives included in other comprehensive loss			173		8
Reclassified from AOCL to income because the forecasted transactions were deemed probable not to occur			$ 86		$ 3

[1] Included in the above table is a loss of $1 million and $2 million for the years ended December 31, 2011 and 2009, respectively, which were reclassified from AOCL to income because the forecasted hedged transactions were deemed probable not to occur.

[2] For the years ended December 31, 2010 and 2009, amounts of $86 million and $3 million, respectively, were reclassified from AOCL to income because the forecasted transactions were deemed probable not to occur.