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Fair Value Measurements (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Net assets measured at fair value on a recurring basis |  | $ 3,500 | $ 2,400 | $ 3,500 | $ 2,400 |
Net assets measured at fair value on a recurring basis measured using unobservable input and as Level 3 |  |  | 1 |  | 1 |
Net Derivative Assets [Member] | PSEG Power [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Issuances (Settlements) | [1] | (8) | $ (4) | (14) | $ (10) |
Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
NDT Fund Foreign Currency |  | $ 1 |  | $ 1 |  | $ 2
[1] | Includes settlements of $(8) million and $(14) million for the three months and nine months ended September 30, 2020, respectively, and $(3) million and $(9) million for the three months and nine months ended September 30, 2019, respectively.

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