Related-Party Transactions (Schedule Of Related Party Transactions, Revenue) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Power [Member]
Billings From Power through BGSS	$ 67	[1]	$ 91	[1]	$ 630	[1]	$ 958	[1]
Billings From Power through BGS	258	[1]	272	[1]	639	[1]	734	[1]
Total Revenue from Affiliates	325		363		1,269		1,692
Administrative Billings from Services	(38)	[2]	(37)	[2]	(110)	[2]	(109)	[2]
Total Expense Billings from Affiliates	(38)		(37)		(110)		(109)
PSE And G [Member]
Billings From Power through BGSS	(67)	[1]	(91)	[1]	(630)	[1]	(958)	[1]
Billings From Power through BGS	(258)	[1]	(272)	[1]	(639)	[1]	(734)	[1]
Administrative Billings from Services	(58)	[2]	(53)	[2]	(165)	[2]	(154)	[2]
Total Expense Billings from Affiliates	$ (383)		$ (416)		$ (1,434)		$ (1,846)

[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. 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.