Commitments And Contingent Liabilities (Guaranteed Obligations) (Detail) (Power [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Power [Member]
Face Value of Outstanding Guarantees	$ 1,564	$ 1,508
Exposure under Current Guarantees	259	226
Letters of Credit Margin Posted	119	124
Letters of Credit Margin Received	61	69
Counterparty Cash Margin Deposited	6	15
Counterparty Cash Margin Received	(1)	(4)
Net Broker Balance Deposited (Received)	149	26
Additional Collateral that could be Required	675	654
Liquidity Available under PSEG's and Power's Credit Facilities to Post Collateral	3,536	3,531
Other Letters of Credit	$ 45	$ 45

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 45

-Paragraph 13

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

Name:	us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant