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Trust Investments (Narrative) (Detail) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) Facility
PSEG Power [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Number of Nuclear Facilities | Facility |  | 5
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 |  | $ 22
Debt Securities [Member] | Rabbi Trust [Member] |  |
Schedule of Trust Investments [Line Items] |  |
After tax amount of net unrealized gains recognized in AOCI |  | 11
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 | $ (9) | 102
Equity Securities [Member] | Rabbi Trust [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Unrealized Gains (Losses) on Equity Securities still held | $ 1 | $ 4

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