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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 | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Included in Income |  | $ 2 |  | $ (4) | $ 10 |  | $ (8) |  |  |  |
Settlements |  | (3) |  | (1) | (9) |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) |  | (2) |  | (3) | 1 |  | (8) |  |  |  |
Net Derivative Assets (Liabilities) [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 |  |  |  |  |  |  |  |  | $ 1 | $ 4 | $ 7
Opening Balance |  | 4 |  |  |  |  |  |  |  |  |
Included in Income |  | (1) | [1] | 4 | 10 | [1] | (8) | [1] |  |  |
Purchases, (Sales) |  | 0 |  | 0 | 0 |  | 0 |  |  |  |
Issuances (Settlements) |  | (4) |  | (1) | (10) | [2] | 0 | [2] |  |  |
Transfers In (Out) | [3] | 0 |  | 0 | 0 |  | 0 |  |  |  |
Closing Balance |  | 1 |  | (1) | 1 |  | (1) |  |  |  |
Operating Revenues [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Included in Income |  | (2) |  | (8) | 14 |  | (7) |  |  |  |
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) |  | (4) |  | (8) | 5 |  | (7) |  |  |  |
Energy Costs [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Included in Income |  | 2 |  | 4 | (4) |  | (1) |  |  |  |
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) |  | $ 4 |  | $ 5 | $ (4) |  | $ (1) |  |  |  |
[1] | Unrealized gains (losses) in the following table represent the change in derivative assets and liabilities still held as of September 30, 2019 and 2018. .
|  |  | Three Months Ended September 30, |  | Nine Months Ended September 30, |
|  |  | 2019 |  | 2018 |  | 2019 |  | 2018 |
|  |  | Total Gains (Losses) |  | Unrealized Gains (Losses) |  | Total Gains (Losses) |  | Unrealized Gains (Losses) |  | Total Gains (Losses) |  | Unrealized Gains (Losses) |  | Total Gains (Losses) |  | Unrealized Gains (Losses) |
|  |  | Millions |
| PSEG and PSEG Power |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Operating Revenues |  | $ | (2 | ) |  | $ | (4 | ) |  | $ | (8 | ) |  | $ | (8 | ) |  | $ | 14 |  |  | $ | 5 |  |  | $ | (7 | ) |  | $ | (7 | ) |
| Energy Costs |  | 4 |  |  | 2 |  |  | 4 |  |  | 5 |  |  | (4 | ) |  | (4 | ) |  | (1 | ) |  | (1 | ) |
| Total |  | $ | 2 |  |  | $ | (2 | ) |  | $ | (4 | ) |  | $ | (3 | ) |  | $ | 10 |  |  | $ | 1 |  |  | $ | (8 | ) |  | $ | (8 | ) |
[2] | settlements of $(3) million and $(9) million for the three months and nine months ended September 30, 2019 and $(1) million for the three months ended September 30, 2018.
[3] | There were no transfers into or out of Level 3 during the three months and nine months ended September 30, 2019 and 2018.

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