Related-Party Transactions (Schedule Of Related Party Transactions, Payables) (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2013		Dec. 31, 2012
PSE And G [Member]
Payable to Power through BGS and BGSS Contracts	$ (107)	[1]	$ (238)	[1]
Payable to Power Related to Gas Supply Hedges for BGSS	(28)	[1]	(27)	[1]
Payable to Power for SREC Liability	(9)	[2]	(7)	[2]
Receivable from (Payable to) Services	(48)	[3]	(65)	[3]
Tax Receivable from (Payable to) PSEG	244	[4]	256	[4]
Receivable from PSEG	3		6
Receivable from Energy Holdings	4		2
Accounts Receivable (Payable) - Affiliated Companies, net	59		(73)
Working Capital Advances to Services	33	[5]	33	[5]
Long-Term Accrued Taxes Payable	(43)	[4]	(32)	[4]
Accrued Liability for Excess SREC costs	17		17
Power's Share Of PSE&G's Liability [Member]
Accrued Liability for Excess SREC costs	$ 9		$ 7

[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] Pursuant to a BPU Order, certain BGS suppliers will be reimbursed for the cost they incurred above $300 per Solar Renewable Energy Certificate (SREC) or per Solar Alternative Compliance Payment (SACP) during the period June 1, 2008 through May 31, 2010 and such excess cost will be passed on to ratepayers. In a December 2012 order, the BPU approved a Stipulation of Settlement (Stipulation) that described the mechanism by which BGS suppliers recover reasonable and prudently-incurred costs for these SRECs. In accordance with the Stipulation, New Jersey's EDCs, including PSE&G, made a Verification Filing defining the proposed BGS Supplier payments. PSE&G has estimated and accrued a total liability for the excess SREC cost expected to be recovered from ratepayers of $17 million as of June 30, 2013 and December 31, 2012, including approximately $9 million and $7 million for Power’s share which is included in PSE&G’s Accounts Receivable (Payable)—Affiliated Companies as of June 30, 2013 and December 31, 2012, respectively. Under current accounting guidance, Power was unable to record the related intercompany receivable on its Condensed Consolidated Balance Sheet, until the BPU issued an Order approving such payments. As a result, PSE&G’s liability to Power was not eliminated in consolidation and is included in Other Current Liabilities on PSEG’s Condensed Consolidated Balance Sheet as of June 30, 2013 and December 31, 2012. On May 29, 2013, the BPU issued an Order approving the additional BGS payment for these SRECs with a 45 day appeal period which expired in July 2013 with no appeals filed. As a result, Power recorded its $9 million receivable from PSE&G in July 2013.

[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.

[5] Power and PSE&G have advanced working capital to Services. The amounts are included in Other Noncurrent Assets on Power’s and PSE&G’s Condensed Consolidated Balance Sheets.