Related-Party Transactions (Schedule Of Related Party Transactions, Payables) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended		144 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
PSE&G [Member]
Payable to Power through BGS and BGSS Contracts	$ (238)	[1]	$ (247)	[1]
Payable to Power Related to Gas Supply Hedges for BGSS	(27)	[1]	(109)	[1]
Payable to Power for SREC Liability	(7)	[2]	(7)	[2]
Receivable from (Payable to) Services	(65)	[3]	(56)	[3]
Tax Receivable from (Payable to) PSEG	256	[4]	131	[4]
Receivable from PSEG	6		8
Receivable from Energy Holdings	2		0
Accounts Payable-Affiliated Companies, net	(73)		(280)
Working Capital Advances to Services	33	[2]	33	[2]
Long-Term Accrued Taxes Payable	(32)	[4]	(83)	[4]
Accrued Liability for Excess SREC costs	17
Power's Share Of PSE&G's Liability [Member]
Accrued Liability for Excess SREC costs	$ 7

[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] In 2008, the BPU issued a decision that certain BGS suppliers will be reimbursed for the cost they incurred above $300 per Solar Renewable Energy Certificate (SREC) during the period June 1, 2008 through May 31, 2010. The BPU order further provided that the excess cost may be passed on to ratepayers. Following an appeal, on March 10, 2011, the New Jersey Supreme Court reversed and remanded the BPU’s 2008 order. On May 1, 2012, the BPU reaffirmed its earlier decision and on December 19, 2012, approved a settlement that defines requirements for review and reimbursement of incremental SREC costs to certain BGS suppliers. PSE&G has estimated and accrued a total liability for the excess SREC cost of $17 million as of December 31, 2012 and 2011, including approximately $7 million for Power’s share which is included in PSE&G’s Accounts Payable—Affiliated Companies as of December 31, 2012 and 2011. Under current guidance, Power is unable to record the related intercompany receivable on its Consolidated Balance Sheet. As a result, PSE&G’s liability to Power is not eliminated in consolidation and is included in Other Current Liabilities on PSEG’s Consolidated Balance Sheet as of December 31, 2012 and 2011.

[3] 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.

[4] PSEG files a consolidated federal income tax return with its affiliated companies. A tax allocation agreement exists between PSEG and each of its affiliated companies. The general operation of these agreements is that the subsidiary company will compute its taxable income on a stand-alone basis. If the result is a net tax liability, such amount shall be paid to PSEG. If there are net operating losses and/or tax credits, the subsidiary shall receive payment for the tax savings from PSEG to the extent that PSEG is able to utilize those benefits.