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Financial Risk Management Activities (Narrative) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Derivatives, Fair Value [Line Items] |  |
Net cash collateral received in connection with net derivative contracts | $ 4 us-gaap_DerivativeFairValueAmountOffsetAgainstCollateralNet | $ 24 us-gaap_DerivativeFairValueAmountOffsetAgainstCollateralNet
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral | 104 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral | 127 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
Additional collateral aggregate fair value | 881 us-gaap_AdditionalCollateralAggregateFairValue | 945 us-gaap_AdditionalCollateralAggregateFairValue
Power [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Amount of after-tax gains on derivatives designated and effective as cash flow hedges expected to be reclassified to earnings during the 12 months following period end | 1 pseg_CommodityCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet / dei_LegalEntityAxis = pseg_PowerMember |
Credit exposure, percentage | 96.70%pseg_PercentageOfCreditExposure / dei_LegalEntityAxis = pseg_PowerMember |
Number of active counterparties on credit risk derivatives | 144 pseg_NumberOfActiveCounterpartiesOnCreditRiskDerivatives / dei_LegalEntityAxis = pseg_PowerMember |
Power [Member] | Senior Notes 5.32% Due September 2016 [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Senior Notes converted into variable rate debt | 300 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = pseg_SeniorNotes532DueSeptember2016Member / dei_LegalEntityAxis = pseg_PowerMember |
PSEG [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate amount of series of interest rate swaps converting to variable-rate debt | 850 invest_DerivativeNotionalAmount / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Senior Notes converted into variable rate debt | 303 us-gaap_SeniorNotes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Fair value of interest rate swaps designated as underlying hedges | 18 us-gaap_InterestRateFairValueHedgeAssetAtFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 22 us-gaap_InterestRateFairValueHedgeAssetAtFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral | 26 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 18 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Additional collateral aggregate fair value | 78 us-gaap_AdditionalCollateralAggregateFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 109 us-gaap_AdditionalCollateralAggregateFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Amount of reduction in interest expense attributed to interest rate swaps designated as fair value hedges | 5 us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1 / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
PSEG [Member] | Senior Notes 5.5% Due December 2015 [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Senior Notes converted into variable rate debt | 300 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = pseg_SeniorNotesFivePointFivePercentDueTwoThousandFifteenMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Stated interest rate of debt instrument | 5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pseg_SeniorNotesFivePointFivePercentDueTwoThousandFifteenMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
PSEG [Member] | Senior Notes 5.32% Due September 2016 [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Stated interest rate of debt instrument | 5.32%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pseg_SeniorNotes532DueSeptember2016Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
PSEG [Member] | Senior Notes 2.75% Due September 2016 [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Senior Notes converted into variable rate debt | 250 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = pseg_SeniorNotesTwoPointSevenFivePercentDueSeptemberTwoThousandSixteenMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Stated interest rate of debt instrument | 2.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pseg_SeniorNotesTwoPointSevenFivePercentDueSeptemberTwoThousandSixteenMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Non Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Net cash collateral received in connection with net derivative contracts | $ (3)us-gaap_DerivativeFairValueAmountOffsetAgainstCollateralNet / us-gaap_BalanceSheetLocationAxis = pseg_NonCurrentAssetsMember | $ (8)us-gaap_DerivativeFairValueAmountOffsetAgainstCollateralNet / us-gaap_BalanceSheetLocationAxis = pseg_NonCurrentAssetsMember

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Commodity Cash Flow Hedge Gain Loss to be Reclassified During Next 12 Months Net + References No definition available. + Details
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Namespace Prefix: | pseg_
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Balance Type: | credit
Period Type: | instant

X
- Definition Number of active counterparties on credit risk derivatives + References No definition available. + Details
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Namespace Prefix: | pseg_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Definition Percentage Of Credit Exposure + References No definition available. + Details
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Namespace Prefix: | pseg_
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Balance Type: | na
Period Type: | duration

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- Definition No authoritative reference available. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |