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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
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Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Included in Income | [1] | $ (6) |  | $ 26
Transfers In (Out) |  |  |  | (1)
Settlements |  |  |  | 24
Net Assets Measured At Fair Value On A Recurring Basis |  | 2,200 |  | 2,600
Net Assets Measured At Fair Value On A Recurring Basis Measured Using Unobservable Input And Classified As Level3 |  | 1 |  | 7
Unrealized Gains (Losses) |  | (6) |  | 3
Net Derivative Assets (Liabilities) [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening Balance |  | 7 |  | 1
Included in Income | [1] | (6) |  | 26
Included in Regulatory Assets/Liabilities | [2] | 0 |  | 5
Purchases, (Sales) |  | 0 |  | 0
Issuances (Settlements) | [3] | 0 |  | (24)
Transfers In (Out) |  | 0 | [4] | (1)
Closing Balance |  | 1 |  | 7
Net Derivative Assets (Liabilities) [Member] | Power [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening Balance |  | 7 |  | 6
Included in Income | [1] | (6) |  | 26
Included in Regulatory Assets/Liabilities | [2] | 0 |  | 0
Purchases, (Sales) |  | 0 |  | 0
Issuances (Settlements) | [3] | 0 |  | (24)
Transfers In (Out) |  | 0 | [4] | (1)
Closing Balance |  | 1 |  | 7
Net Derivative Assets (Liabilities) [Member] | PSE&G [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening Balance |  | 0 |  | (5)
Included in Income | [1] |  |  | 0
Included in Regulatory Assets/Liabilities | [2] |  |  | 5
Purchases, (Sales) |  |  |  | 0
Issuances (Settlements) | [3] |  |  | 0
Transfers In (Out) |  |  |  | 0
Closing Balance |  |  |  | 0
Operating Revenues [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Included in Income | [1] | (2) |  | 14
Unrealized Gains (Losses) |  | 0 |  | (9)
Energy Costs [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Included in Income | [1] | (4) |  | 12
Unrealized Gains (Losses) |  | $ (6) |  | $ 12
[1] | Unrealized gains (losses) in the following table represent the change in derivative assets and liabilities still held as of December 31, 2018 and 2017.
[2] | (B)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 custom
[3] | Represents $(24) million in settlements for derivative contracts in 2017.
[4] | During the year ended December 31, 2017, $(1) million of net derivatives assets/liabilities were transferred from Level 2 to Level 3. There were no transfers in 2018.

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