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Fair Value Measurements (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 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 | $ 2,900 | $ 2,500 | $ 2,900 |  | $ 2,500 |  |
Net assets measured at fair value on a recurring basis measured using unobservable input and as Level 3 | 10 | 4 | 10 |  | 4 |  |
Net Derivative Assets [Member] | PSEG Power [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Issuances (Settlements) | (5) | $ (2) | (6) | [1] | $ (6) | [1] |
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] | settlements of $(5) million and $(6) million for the three months and six months ended June 30, 2020, respectively, and $(2) million and $(6) million for the three months and six months ended June 30, 2019, respectively.

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