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Trust Investments (Narrative) (Detail) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) Facility | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
PSEG Power [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Number of Nuclear Facilities | Facility |  |  | 5 |  |  |
Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
NDT Fund Foreign Currency | $ 1 |  | $ 1 |  |  | $ 2
Impairment of Debt Securities | 0 | $ 0 | (3) | [1] | $ 0 |
Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
After tax amount of net unrealized gains recognized in AOCI |  |  | 36 |  |  |
Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
After tax amount of net unrealized gains recognized in AOCI |  |  | 13 |  |  |
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Unrealized Gains (Losses) on Equity Securities still held | 48 |  | 48 |  |  |
Equity Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Unrealized Gains (Losses) on Equity Securities still held | $ 2 |  | $ 1 |  |  |
[1] | PSEG Power recognized an impairment of available-for-sale debt securities that it intends to sell. PSEG Power’s policy is to sell all such securities that are rated below investment grade.

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