Related-Party Transactions (Schedule Of Related Party Transactions, Revenue) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Power [Member]
Billings From Power through BGSS	$ 112	[1]	$ 169	[1]	$ 563	[1]	$ 867	[1]
Billings From Power through BGS	192	[1]	229	[1]	381	[1]	462	[1]
Total Revenue from Affiliates	304		398		944		1,329
Administrative Billings from Services	(38)	[2]	(35)	[2]	(72)	[2]	(72)	[2]
Total Expense Billings from Affiliates	(38)		(35)		(72)		(72)
PSE And G [Member]
Billings From Power through BGSS	(112)	[1]	(169)	[1]	(563)	[1]	(867)	[1]
Billings From Power through BGS	(192)	[1]	(229)	[1]	(381)	[1]	(462)	[1]
Administrative Billings from Services	(57)	[2]	(50)	[2]	(107)	[2]	(101)	[2]
Total Expense Billings from Affiliates	$ (361)		$ (448)		$ (1,051)		$ (1,430)

[1] PSE&G has entered into a requirements contract with Power under which Power provided the gas supply services needed to meet PSE&G's BGSS and other contractual requirements through March 31, 2012 and continues on a year-to-year basis thereafter. 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.