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Commitments And Contingent Liabilities (Guaranteed Obligations) (Detail) (Power [Member], USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Power [Member] |  |
Face Value of Outstanding Guarantees | $ 1,811 us-gaap_GuaranteeObligationsMaximumExposure / dei_LegalEntityAxis = pseg_PowerMember | $ 1,814 us-gaap_GuaranteeObligationsMaximumExposure / dei_LegalEntityAxis = pseg_PowerMember
Exposure under Current Guarantees | 244 pseg_ExposureUnderCurrentGuarantees / dei_LegalEntityAxis = pseg_PowerMember | 273 pseg_ExposureUnderCurrentGuarantees / dei_LegalEntityAxis = pseg_PowerMember
Letters of Credit Margin Posted | 140 pseg_LettersOfCreditMarginPosted / dei_LegalEntityAxis = pseg_PowerMember | 159 pseg_LettersOfCreditMarginPosted / dei_LegalEntityAxis = pseg_PowerMember
Letters of Credit Margin Received | 91 pseg_LettersOfCreditMarginReceived / dei_LegalEntityAxis = pseg_PowerMember | 40 pseg_LettersOfCreditMarginReceived / dei_LegalEntityAxis = pseg_PowerMember
Counterparty Cash Margin Deposited | 0 pseg_CounterpartyCashMarginDeposited / dei_LegalEntityAxis = pseg_PowerMember | 0 pseg_CounterpartyCashMarginDeposited / dei_LegalEntityAxis = pseg_PowerMember
Counterparty Cash Margin Received | (9)pseg_CounterpartyCashMarginReceived / dei_LegalEntityAxis = pseg_PowerMember | (13)pseg_CounterpartyCashMarginReceived / dei_LegalEntityAxis = pseg_PowerMember
Net Broker Balance Deposited (Received) | 97 pseg_NetBrokerBalanceReceived / dei_LegalEntityAxis = pseg_PowerMember | 115 pseg_NetBrokerBalanceReceived / dei_LegalEntityAxis = pseg_PowerMember
Additional Collateral that could be Required | 881 pseg_AdditionalCollateralThatCouldBeRequiredIfPowerLoosesInvestmentGradeRating / dei_LegalEntityAxis = pseg_PowerMember | 945 pseg_AdditionalCollateralThatCouldBeRequiredIfPowerLoosesInvestmentGradeRating / dei_LegalEntityAxis = pseg_PowerMember
Liquidity Available under PSEG's and Power's Credit Facilities to Post Collateral | 3,514 pseg_LiquidityAvailableUnderPsegAndPowerCreditFacilitiesToPostCollateral / dei_LegalEntityAxis = pseg_PowerMember | 3,495 pseg_LiquidityAvailableUnderPsegAndPowerCreditFacilitiesToPostCollateral / dei_LegalEntityAxis = pseg_PowerMember
Other Letters of Credit | $ 45 pseg_AdditionalAmountsPostedOtherLettersOfCredit / dei_LegalEntityAxis = pseg_PowerMember | $ 45 pseg_AdditionalAmountsPostedOtherLettersOfCredit / dei_LegalEntityAxis = pseg_PowerMember

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- Definition Additional Amounts Posted Other Letters of Credit + References No definition available. + Details
Name: | pseg_AdditionalAmountsPostedOtherLettersOfCredit
Namespace Prefix: | pseg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Additional Collateral that could be Required if Power Looses Investment Grade Rating + References No definition available. + Details
Name: | pseg_AdditionalCollateralThatCouldBeRequiredIfPowerLoosesInvestmentGradeRating
Namespace Prefix: | pseg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Counterparty Cash Margin Deposited + References No definition available. + Details
Name: | pseg_CounterpartyCashMarginDeposited
Namespace Prefix: | pseg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Counterparty Cash Margin Received + References No definition available. + Details
Name: | pseg_CounterpartyCashMarginReceived
Namespace Prefix: | pseg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Exposure under Current Guarantees + References No definition available. + Details
Name: | pseg_ExposureUnderCurrentGuarantees
Namespace Prefix: | pseg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Letters of Credit Margin Posted + References No definition available. + Details
Name: | pseg_LettersOfCreditMarginPosted
Namespace Prefix: | pseg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Letters of Credit Margin Received + References No definition available. + Details
Name: | pseg_LettersOfCreditMarginReceived
Namespace Prefix: | pseg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Liquidity Available under PSEG and Power Credit Facilities to Post Collateral + References No definition available. + Details
Name: | pseg_LiquidityAvailableUnderPsegAndPowerCreditFacilitiesToPostCollateral
Namespace Prefix: | pseg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Net Broker Balance Received + References No definition available. + Details
Name: | pseg_NetBrokerBalanceReceived
Namespace Prefix: | pseg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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