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Trust Investments (Narrative) (Detail) - PSEG Power [Member] $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) Facility | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($)
Schedule of Trust Investments [Line Items] |  |  |  |
Number of Nuclear Facilities | Facility | 5 |  |  |
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
NDT Fund Foreign Currency | $ 1 |  |  | $ 2
Impairment of Debt Securities | 0 | [1] | $ (3) |
Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
After tax amount of net unrealized gains recognized in AOCI | 8 |  |  |
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Unrealized Gains (Losses) on Equity Securities still held | $ 24 |  |  |
[1] | PSEG Power recognized an impairment of available-for-sale debt securities in 2020. PSEG Power’s policy is to sell all securities that are rated below investment grade.

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