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v2.4.1.9

Fair Value Measurements (Changes In Level 3 Assets And (Liabilities) Measured At Fair Value On A Recurring Basis) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Settlements | $ (12)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements |  | $ 59 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements |
Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gains and losses attributable to changes in net derivative assets and liabilities, included in Operating Income | 3 pseg_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInTradingRevenue / dei_LegalEntityAxis = pseg_PowerMember |  | (64)pseg_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInTradingRevenue / dei_LegalEntityAxis = pseg_PowerMember |
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized | (9)us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / dei_LegalEntityAxis = pseg_PowerMember |  | (5)us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / dei_LegalEntityAxis = pseg_PowerMember |
Net Derivative Assets (Liabilities) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Opening Balance | 37 us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember |  | 88 us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember |
Included in Income | 3 us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember | [1] | (64)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember | [2]
Included in Regulatory Assets/Liabilities | (19)pseg_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasiswithUnobservableInputsGainLossIncludedInRegulatoryAssetsLiabilities / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember | [3] | (82)pseg_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasiswithUnobservableInputsGainLossIncludedInRegulatoryAssetsLiabilities / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember | [3]
Purchases, (Sales) | 0 pseg_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasiswithUnobservableInputsPurchasesSales / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember |  | 0 pseg_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasiswithUnobservableInputsPurchasesSales / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember |
Issuances (Settlements) | (12)pseg_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasiswithUnobservableInputsIssuancesSettlements / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember | [4] | 59 pseg_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasiswithUnobservableInputsIssuancesSettlements / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember | [4]
Transfers In (Out) | 0 us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersNet / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember |  | 0 us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersNet / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember |
Closing Balance | 9 us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember |  | 1 us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember |
Net Derivative Assets (Liabilities) [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Opening Balance | 11 us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PowerMember |  | (6)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PowerMember |
Included in Income | 3 us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PowerMember | [1] | (64)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PowerMember | [2]
Included in Regulatory Assets/Liabilities | 0 pseg_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasiswithUnobservableInputsGainLossIncludedInRegulatoryAssetsLiabilities / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PowerMember | [3] | 0 pseg_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasiswithUnobservableInputsGainLossIncludedInRegulatoryAssetsLiabilities / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PowerMember | [3]
Purchases, (Sales) | 0 pseg_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasiswithUnobservableInputsPurchasesSales / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PowerMember |  | 0 pseg_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasiswithUnobservableInputsPurchasesSales / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PowerMember |
Issuances (Settlements) | (12)pseg_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasiswithUnobservableInputsIssuancesSettlements / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PowerMember | [4] | 59 pseg_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasiswithUnobservableInputsIssuancesSettlements / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PowerMember | [4]
Transfers In (Out) | 0 us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersNet / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PowerMember |  | 0 us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersNet / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PowerMember |
Closing Balance | 2 us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PowerMember |  | (11)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PowerMember |
Net Derivative Assets (Liabilities) [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Opening Balance | 26 us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PseAndGMember |  | 94 us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PseAndGMember |
Included in Income | 0 us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PseAndGMember | [1] | 0 us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PseAndGMember | [2]
Included in Regulatory Assets/Liabilities | (19)pseg_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasiswithUnobservableInputsGainLossIncludedInRegulatoryAssetsLiabilities / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PseAndGMember | [3] | (82)pseg_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasiswithUnobservableInputsGainLossIncludedInRegulatoryAssetsLiabilities / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PseAndGMember | [3]
Purchases, (Sales) | 0 pseg_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasiswithUnobservableInputsPurchasesSales / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PseAndGMember |  | 0 pseg_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasiswithUnobservableInputsPurchasesSales / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PseAndGMember |
Issuances (Settlements) | 0 pseg_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasiswithUnobservableInputsIssuancesSettlements / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PseAndGMember | [4] | 0 pseg_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasiswithUnobservableInputsIssuancesSettlements / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PseAndGMember | [4]
Transfers In (Out) | 0 us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersNet / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PseAndGMember |  | 0 us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersNet / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PseAndGMember |
Closing Balance | $ 7 us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PseAndGMember |  | $ 12 us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs / us-gaap_FairValueByAssetClassAxis = pseg_NetDerivativeAssetsMember / dei_LegalEntityAxis = pseg_PseAndGMember |
[1] | PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities include $3 million in Operating Income for the three months ended March 31, 2015, respectively. Of the $3 million in Operating Income, $(9) million is unrealized.
[2] | PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities include $(64) million in Operating Income for the three months ended March 31, 2014. Of the $(64) million in Operating Income, $(5) million is unrealized.
[3] | Mainly includes gains/losses on PSE&G’s derivative contracts that are not included in either earnings or Other Comprehensive Income, as they are deferred as a Regulatory Asset/Liability and are expected to be recovered from/returned to PSE&G’s customers.
[4] | Represents $(12) million and $59 million in settlements for the three months ended March 31, 2015 and 2014.

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