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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, 2020 | Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Net Assets Measured At Fair Value On A Recurring Basis |  | $ 3,100 | $ 2,600
Net Assets Measured At Fair Value On A Recurring Basis Measured Using Unobservable Input And Classified As Level3 |  | 7 | 7
PSEG Power LLC |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Included in Income |  | 16 | 14
Unrealized Gains (Losses) |  | 2 | 6
Net Derivative Assets (Liabilities) [Member] | PSEG Power LLC |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Opening Balance |  | 7 | 1
Included in Income | [1] | 16 | 14
Purchases, (Sales) |  | 0 | 0
Issuances (Settlements) | [2] | (16) | (8)
Transfers In (Out) | [3] | 0 | 0
Closing Balance |  | 7 | 7
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  | (14) | (7)
Operating Revenues [Member] | PSEG Power LLC |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Included in Income |  | 26 | 23
Unrealized Gains (Losses) |  | 1 | 12
Energy Costs [Member] | PSEG Power LLC |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Included in Income |  | 1 | (6)
Unrealized Gains (Losses) |  | $ (10) | $ (9)
[1] | Unrealized gains (losses) in the following table represent the change in derivative assets and liabilities still held as of December 31, 2020 and 2019.
|  |  | Years Ended December 31, |
|  |  | 2020 |  | 2019 |
|  |  | Total Gains (Losses) |  | Unrealized Gains (Losses) |  | Total Gains (Losses) |  | Unrealized Gains (Losses) |
|  |  | Millions |
| PSEG and PSEG Power |  |  |  |  |  |  |  |  |
| Operating Revenues |  | $ | 26 |  |  | $ | 1 |  |  | $ | 23 |  |  | $ | 12 |  |
| Energy Costs |  | (10) |  |  | 1 |  |  | (9) |  |  | (6) |  |
| Total |  | $ | 16 |  |  | $ | 2 |  |  | $ | 14 |  |  | $ | 6 |  |
[2] | Includes $(14) million and $(7) million in settlements for derivative contracts in 2020 and 2019.
[3] | There were no transfers in 2020 and 2019 to or from Level 3.

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