Income Taxes (Interest And Penalties Related To Unrecognized Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Increase (Decrease) in Unrecognized Tax Benefits Including Interest	$ 395	$ 379	$ 354
PSE&G [Member]
Increase (Decrease) in Unrecognized Tax Benefits Including Interest	(24)	(20)	(22)
Power [Member]
Increase (Decrease) in Unrecognized Tax Benefits Including Interest	(11)	(17)	(2)
Energy Holdings [Member]
Increase (Decrease) in Unrecognized Tax Benefits Including Interest	420	407	370
Other Subsidiaries [Member]
Increase (Decrease) in Unrecognized Tax Benefits Including Interest	$ 10	$ 9	$ 8

- Definition

This element represents the total of interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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