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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 | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Included in Income |  | $ 13 | $ 1 |  |
Settlements |  | (1) | (4) |  |
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 12 | (3) |  |
Net Derivative Assets (Liabilities) [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Closing Balance |  | 19 | (2) |  |
Net Derivative Assets (Liabilities) [Member] | PSEG Power [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  |  |  | $ 7 | $ 1
Included in Income | [1] | 13 | 1 |  |
Purchases, (Sales) |  | 0 | 0 |  |
Issuances (Settlements) | [2] | (1) | (4) |  |
Transfers In (Out) | [3] | 0 | 0 |  |
Operating Revenues [Member] | PSEG Power [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Included in Income |  | 18 | 6 |  |
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 11 | 0 |  |
Energy Costs [Member] | PSEG Power [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Included in Income |  | 1 | (3) |  |
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) |  | $ (5) | $ (5) |  |
[1] | Unrealized gains (losses) in the following table represent the change in derivative assets and liabilities still held as of March 31, 2020 and 2019. .
|  | Three Months Ended March 31, |
|  | 2020 |  | 2019 |
|  | Total Gains (Losses) |  | Unrealized Gains (Losses) |  | Total Gains (Losses) |  | Unrealized Gains (Losses) |
|  | Millions |
| PSEG and PSEG Power |  |  |  |  |  |  |  |
| Operating Revenues | $ | 18 |  |  | $ | 11 |  |  | $ | 6 |  |  | $ | — |  |
| Energy Costs | (5 | ) |  | 1 |  |  | (5 | ) |  | (3 | ) |
| Total | $ | 13 |  |  | $ | 12 |  |  | $ | 1 |  |  | $ | (3 | ) |
[2] | settlements of $(1) million for the three months ended March 31, 2020 and $(4) million for the three months ended March 31, 2019.
[3] | There were no transfers into or out of Level 3 during the three months ended March 31, 2020 and 2019.

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