Related-Party Transactions (Schedule Of Related Party Transactions, Revenue) (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
Power [Member]
Billings From Power through BGSS	$ 48	[1]	$ 67	[1]	$ 654	[1]	$ 630	[1]
Billings From Power through BGS	236	[1]	258	[1]	621	[1]	639	[1]
Total Revenue from Affiliates	284		325		1,275		1,269
Administrative Billings from Services	(43)	[2]	(38)	[2]	131	[2]	110	[2]
Total Expense Billings from Affiliates	(43)		(38)		(131)		(110)
PSE And G [Member]
Billings From Power through BGSS	(48)	[1]	(67)	[1]	(654)	[1]	(630)	[1]
Billings From Power through BGS	(236)	[1]	(258)	[1]	(621)	[1]	(639)	[1]
Administrative Billings from Services	(61)	[2]	(58)	[2]	(184)	[2]	(165)	[2]
Total Expense Billings from Affiliates	$ (345)		$ (383)		$ (1,459)		$ (1,434)

[1] PSE&G has entered into a requirements contract with Power under which Power provides 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.