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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Settlements |  | $ 21 | $ 20 |  |
Net Assets Measured At Fair Value On A Recurring Basis |  | 2,600 | 2,500 |  |
Net Assets Measured At Fair Value On A Recurring Basis Measured Using Unobservable Input And Classified As Level3 |  | 1 | 13 |  |
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 |  | 13 | 20 |  |
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 |  |  | 13 |  | $ 37
Opening Balance |  | 13 |  |  |
Included in Income | [1] | 13 | 20 |  |
Included in Regulatory Assets/Liabilities | [2] | (7) | (24) |  |
Purchases, (Sales) |  | (3) | 0 |  |
Issuances (Settlements) | [3] | 21 | (20) |  |
Transfers In (Out) |  | 0 | 0 |  |
Closing Balance |  | 1 | 13 |  |
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 |  | 11
Opening Balance |  | 11 |  |  |
Included in Income | [1] | 13 | 20 |  |
Included in Regulatory Assets/Liabilities | [2] | 0 | 0 |  |
Purchases, (Sales) |  | (3) | 0 |  |
Issuances (Settlements) | [3] | (21) | (20) |  |
Transfers In (Out) |  | 0 | 0 |  |
Closing Balance |  | 6 | 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 |  |  | 2 |  | $ 26
Opening Balance |  | 2 |  |  |
Included in Income | [1] | 0 | 0 |  |
Included in Regulatory Assets/Liabilities |  | (7) | (24) | [2] |
Purchases, (Sales) |  | 0 | 0 |  |
Issuances (Settlements) | [3] | 0 | 0 |  |
Transfers In (Out) |  | 0 | 0 |  |
Closing Balance |  | $ (5) | $ 2 |  |
[1] | PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities include $13 million and $20 million in Operating Income in 2016 and 2015, respectively. Of the $13 million in Operating Income in 2016 $(5) million is unrealized. The $20 million in Operating Income in 2015 is realized.
[2] | Mainly includes gains/losses on PSE&G’s derivative contracts that are not included in either earnings or Accumulated 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.
[3] | Represents $(21) million and $(20) million in settlements for derivative contracts in 2016 and 2015, respectively.

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