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Financial Risk Management Activities (Schedule Of Derivative Instruments Designated As Cash Flow Hedges) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items] |  |
Interest Expense | $ (92) | $ (98)
Operating Revenues | 2,616 | 3,135
PSEG [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion) | 3 | 1
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) | 0 | 0
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Energy Costs (Effective Portion) | 0 | 17
Power [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion) | 0 | 1
Interest Expense | (22) | (31)
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) | 0 | 0
Operating Revenues | 1,313 | 1,725
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Energy Costs (Effective Portion) | 0 | 17
Operating Revenues [Member] | Energy-Related Contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion) | 0 | 1
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion | 0 | 17
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) | 0 | 0
Operating Revenues [Member] | Power [Member] | Energy-Related Contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion) | 0 | 1
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion | 0 | 17
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) | 0 | 0
Interest Expense [Member] | Interest Rate Swap [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion) | 3 |
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) | 0 |
Interest Expense [Member] | PSEG [Member] | Interest Rate Swap [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion) |  | 0
Interest Expense | $ 0 | 0
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) |  | $ 0

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- Definition The effective portion of gain reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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- Definition The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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