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Related-Party Transactions Related-Party Revenues and Expenses (Details) (Power [Member], USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Power [Member]
      
Related Party Transaction [Line Items]      
Billings To PSE&G through BGSS and BGS $ 1,771us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= pseg_PowerMember		 [1] $ 1,797us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= pseg_PowerMember		 [1] $ 1,802us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= pseg_PowerMember		 [1]
Administrative Billings from Services $ 165pseg_BillingsFromAdministrativeSharedServiceCompanyAffiliated
/ dei_LegalEntityAxis
= pseg_PowerMember		 [2] $ 178pseg_BillingsFromAdministrativeSharedServiceCompanyAffiliated
/ dei_LegalEntityAxis
= pseg_PowerMember		 [2] $ 154pseg_BillingsFromAdministrativeSharedServiceCompanyAffiliated
/ dei_LegalEntityAxis
= pseg_PowerMember		 [2]
[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 PSE&G and Power at cost. In addition, PSE&G and Power 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.