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Related-Party Transactions (Schedule Of Related Party Transactions, Revenue) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Power [Member] |  |  |  |
Billings to PSE&G through BGS and BGSS | $ 696 us-gaap_RevenueFromRelatedParties / dei_LegalEntityAxis = pseg_PowerMember | [1] | $ 731 us-gaap_RevenueFromRelatedParties / dei_LegalEntityAxis = pseg_PowerMember | [1]
Administrative Billings from Services | 45 pseg_BillingsFromAdministrativeSharedServiceCompanyAffiliated / dei_LegalEntityAxis = pseg_PowerMember | [2] | 42 pseg_BillingsFromAdministrativeSharedServiceCompanyAffiliated / dei_LegalEntityAxis = pseg_PowerMember | [2]
PSE And G [Member] |  |  |  |
Billings from Power through BGS and BGSS | 696 us-gaap_CostsAndExpensesRelatedParty / dei_LegalEntityAxis = pseg_PseAndGMember | [1] | 731 us-gaap_CostsAndExpensesRelatedParty / dei_LegalEntityAxis = pseg_PseAndGMember | [1]
Administrative Billings from Services | 66 pseg_BillingsFromAdministrativeSharedServiceCompanyAffiliated / dei_LegalEntityAxis = pseg_PseAndGMember | [2] | 60 pseg_BillingsFromAdministrativeSharedServiceCompanyAffiliated / dei_LegalEntityAxis = pseg_PseAndGMember | [2]
Total Billings from Affiliates | $ 762 us-gaap_AffiliateCosts / dei_LegalEntityAxis = pseg_PseAndGMember |  | $ 791 us-gaap_AffiliateCosts / dei_LegalEntityAxis = pseg_PseAndGMember |
[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.

X
- Definition Aggregate billings from affiliated entities earned during the period from providing administrative services to investment managers or funds seeking to outsource all or part of their mutual fund service functions. Examples of such administrative or support services include the following: legal advice, centralized cash management, filing of reports with the SEC and the IRS, registering of fund shares, corresponding with shareholders, and determination of compliance with various restrictions. An affiliate is a party that, directly or indirectly through one or more intermediaries, controls, is controlled by, or is under common control with the entity. + References No definition available. + Details
Name: | pseg_BillingsFromAdministrativeSharedServiceCompanyAffiliated
Namespace Prefix: | pseg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | us-gaap_AffiliateCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | us-gaap_CostsAndExpensesRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | us-gaap_RevenueFromRelatedParties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=pseg_PowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=pseg_PseAndGMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |