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Related-Party Transactions (Schedule Of Related Party Transactions, Revenue) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Power [Member]
Billings From Power through BGSS	$ 478	$ 451
Billings From Power through BGS	193	189
Total Revenue from Affiliates	671	640
Administrative Billings from Services	45	34
Total Expense Billings from Affiliates	45	34
PSE And G [Member]
Billings From Power through BGSS	(478)	(451)
Billings From Power through BGS	(193)	(189)
Administrative Billings from Services	(61)	(50)
Total Expense Billings from Affiliates	$ (732)	$ (690)

Costs associated with revenues arising from an entity that is an affiliate of the reporting entity by means of direct or indirect ownership.

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- Definition

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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