Related-Party Transactions (Schedule Of Related Party Transactions, Revenue) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Power [Member]
Billings From Power through BGSS	$ 987	[1]	$ 1,294	[1]	$ 1,591	[1]
Billings From Power through BGS	815	[1]	921	[1]	1,139	[1]
Total Revenue from Affiliates	1,802		2,215		2,730
Administrative Billings from Services	(154)	[2]	(147)	[2]	(145)	[2]
Total Expense Billings from Affiliates	(154)		(147)		(145)
PSE&G [Member]
Billings From Power through BGSS	(987)	[1]	(1,294)	[1]	(1,591)	[1]
Billings From Power through BGS	(815)	[1]	(921)	[1]	(1,139)	[1]
Administrative Billings from Services	230	[2]	210	[2]	206	[2]
Total Expense Billings from Affiliates	$ 2,032		$ 2,425		$ 2,936

[1] PSE&G has a full requirements contract with Power to meet the supply requirements of default service gas customers. This long-term contract was for an initial period which extended through March 31, 2012 and continues on a year-to-year basis thereafter, unless terminated by either party with a one year notice. Power has also entered into contracts to supply energy, capacity and ancillary services to PSE&G through the BGS auction process.

[2] Services provides and bills administrative services to Power and PSE&G at cost. In addition, Power and PSE&G have other payables to Services, including amounts related to certain common costs, such as pension and OPEB costs, which Services pays on behalf of each of the operating companies.