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Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications of AOCI) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax $ 8us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax $ 1us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax (4)pseg_ReclassificationfromAccumulatedOtherComprehensiveIncomeCurrentPeriodTax (3)pseg_ReclassificationfromAccumulatedOtherComprehensiveIncomeCurrentPeriodTax  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 4us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax (2)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax  
Cash Flow Hedges [Member]      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Energy-Related Contracts, Pre-Tax 17us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
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Energy-Related Contracts, Tax (7)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax
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Energy-Related Contracts, After-Tax 10us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
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Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 10us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
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Pension and OPEB Plans [Member]      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax (14)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax
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Reclassification Adjustment from AOCI, Pension and OPEB, Tax 6us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax
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Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax (8)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax
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Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (8)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
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Available-for-Sale Securities [Member]      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification for Available for Sale Securities, Pre-Tax 5us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
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Reclassification for Available for Sale Securities, Tax (3)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
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Reclassification for Available for Sale Securities, After-Tax 2us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
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Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 2us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
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Power [Member]      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 10us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
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Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax (5)pseg_ReclassificationfromAccumulatedOtherComprehensiveIncomeCurrentPeriodTax
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Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 5us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
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Power [Member] | Cash Flow Hedges [Member]      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Energy-Related Contracts, Pre-Tax 17us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
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Energy-Related Contracts, Tax (7)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax
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Energy-Related Contracts, After-Tax 10us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
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= pseg_PowerMember
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Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 10us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
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Power [Member] | Pension and OPEB Plans [Member]      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax (12)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax
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Reclassification Adjustment from AOCI, Pension and OPEB, Tax 5us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax
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Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax (7)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax
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Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (7)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
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Power [Member] | Available-for-Sale Securities [Member]      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification for Available for Sale Securities, Pre-Tax 5us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
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Reclassification for Available for Sale Securities, Tax (3)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
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Reclassification for Available for Sale Securities, After-Tax 2us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
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Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 2us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
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Operating Expense [Member] | Pension and OPEB Plans [Member]      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Amortization of Prior Service (Cost) Credit, Pre-Tax 3us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
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Amortization of Prior Service (Cost) Credit, Tax (1)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax
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Amortization of Prior Service (Cost) Credit, After-Tax 2us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
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Amortization of Actuarial Loss, Pre-Tax (17)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
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Amortization of Actuarial Loss, After-Tax (10)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
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Operating Expense [Member] | Power [Member] | Pension and OPEB Plans [Member]      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Amortization of Prior Service (Cost) Credit, Pre-Tax 3us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
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Operating Revenues [Member] | Cash Flow Hedges [Member]      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Energy-Related Contracts, Pre-Tax 17us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
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