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Fair Value Measurements (Changes In Level 3 Assets And (Liabilities) Measured At Fair Value On A Recurring Basis) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Settlements |  | $ (20) | $ 51 |
Net Assets Measured At Fair Value On A Recurring Basis |  | 2,500 | 2,500 |
Net Assets Measured At Fair Value On A Recurring Basis Measured Using Unobservable Input And Classified As Level3 |  | 13 | 37 |
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 |  | 20 | (31) |
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized |  |  | 22 |
Derivative [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net |  |  | (3) |
Net Derivative Assets (Liabilities) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs |  |  | 37 | $ 88
Opening Balance |  | 37 |  |
Included in Income | [1] | (20) | 31 |
Included in Regulatory Assets/Liabilities | [2] | (24) | (68) |
Purchases, (Sales) |  | 0 | 0 |
Issuances (Settlements) | [3] | 20 | (51) |
Transfers In (Out) | [4] | 0 | 3 |
Closing Balance |  | 13 | 37 |
Net Derivative Assets (Liabilities) [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs |  |  | 11 | (6)
Opening Balance |  | 11 |  |
Included in Income | [1] | (20) | 31 |
Included in Regulatory Assets/Liabilities | [2] | 0 | 0 |
Purchases, (Sales) |  | 0 | 0 |
Issuances (Settlements) | [3] | 20 | (51) |
Transfers In (Out) | [4] | 0 | 3 |
Closing Balance |  | 11 | 11 |
Net Derivative Assets (Liabilities) [Member] | PSE&G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs |  |  | 26 | $ 94
Opening Balance |  | 26 |  |
Included in Income | [1] | 0 | 0 |
Included in Regulatory Assets/Liabilities | [2] | (24) | (68) |
Purchases, (Sales) |  | 0 | 0 |
Issuances (Settlements) | [3] | 0 | 0 |
Transfers In (Out) | [4] | 0 | 0 |
Closing Balance |  | $ 2 | $ 26 |
[1] | PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities include $20 million and $(31) million in Operating Income in 2015 and 2014, respectively. The $20 million in Operating Income in 2015 is realized. Of the $(31) million in Operating Income in 2014, $22 million is unrealized.
[2] | Mainly includes gains/losses on PSE&G’s derivative contracts that are not included in either earnings or Accumulated Other Comprehensive Income (Loss), as they are deferred as a Regulatory Asset/Liability and are expected to be recovered from/returned to PSE&G’s customers.
[3] | Represents $(20) million and $51 million in settlements for derivative contracts in 2015 and 2014, respectively.
[4] | During the year ended December 31, 2014, $(3) million of net derivatives assets/liabilities were transferred from Level 3 to Level 2 due to more observable pricing for the underlying securities. The transfers were recognized as of the beginning of the quarters (i.e. the quarter in which the transfers occurred), as per PSEG’s policy.

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