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Related Party Transactions - Schedule of Related Party Transactions Included in Income Statement (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Delmarva Power & Light Co/De [Member]
Related Party Transaction [Line Items]
Intercompany lease transactions	$ 1	$ 1	$ 3	$ 3
Atlantic City Electric Co [Member]
Related Party Transaction [Line Items]
Meter reading services provided by Millennium Account Services LLC (an ACE affiliate)	(1)	(1)	(3)	(3)
Intercompany lease transactions			(1)	(1)
Intercompany use revenue	$ 1		$ 2	$ 1

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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