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Trust Investments (Fair Values And Gross Unrealized Gains And Losses For The Securities Held) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Trust Investments, Cost | $ 2,070 |  | $ 1,990 |
Gross Unrealized Gains | 482 |  | 523 |
Gross Unrealized Losses | (29) |  | (14) |
Trust Investments, Fair Value | 2,523 | [1] | 2,499 | [2]
NDT Fund Foreign Currency | 1 |  | 2 |
NDT Fund Cash excluded from Fair Value | 1 |  |  |
Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Trust Investments, Cost | 227 |  | 238 |
Gross Unrealized Gains | 17 |  | 28 |
Gross Unrealized Losses | (6) |  | 0 |
Trust Investments, Fair Value | 238 |  | 266 |
Total Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,223 |  | 1,083 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 34 |  | 66 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (20) |  | (2) |
Debt Securities, Available-for-Sale, Fair Value | 1,237 |  | 1,147 |
Total Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 209 |  | 217 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 7 |  | 18 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (6) |  | 0 |
Debt Securities, Available-for-Sale, Fair Value | 210 |  | 235 |
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Equity Securities, Cost | 847 |  | 907 |
Equity Securities, Accumulated Gross Unrealized Gain | 448 |  | 457 |
Equity Securities, FV-NI, Unrealized Loss | (9) |  | (12) |
Equity Securities, Fair Value | 1,286 |  | 1,352 |
Corporate Debt Obligations [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 587 |  | 528 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 21 |  | 39 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (8) |  | (1) |
Debt Securities, Available-for-Sale, Fair Value | 600 |  | 566 |
Corporate Debt Obligations [Member] | Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 109 |  | 123 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 5 |  | 12 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (2) |  | 0 |
Debt Securities, Available-for-Sale, Fair Value | 112 |  | 135 |
Government Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 636 |  | 555 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 13 |  | 27 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (12) |  | (1) |
Debt Securities, Available-for-Sale, Fair Value | 637 |  | 581 |
Government Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 100 |  | 94 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2 |  | 6 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (4) |  | 0 |
Debt Securities, Available-for-Sale, Fair Value | 98 |  | 100 |
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Equity Securities, Cost | 365 |  | 388 |
Equity Securities, Accumulated Gross Unrealized Gain | 140 |  | 152 |
Equity Securities, FV-NI, Unrealized Loss | (8) |  | (9) |
Equity Securities, Fair Value | 497 |  | 531 |
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Equity Securities, Cost | 482 |  | 519 |
Equity Securities, Accumulated Gross Unrealized Gain | 308 |  | 305 |
Equity Securities, FV-NI, Unrealized Loss | (1) |  | (3) |
Equity Securities, Fair Value | 789 |  | 821 |
Domestic Equity Securities [Member] | Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Equity Securities, Cost | 18 |  | 21 |
Equity Securities, Accumulated Gross Unrealized Gain | 10 |  | 10 |
Equity Securities, FV-NI, Unrealized Loss | 0 |  | 0 |
Equity Securities, Fair Value | $ 28 |  | $ 31 |
[1] | The NDT Fund Investments table excludes cash of $1 million and foreign currency of $1 million as of March 31, 2021, which are part of the NDT Fund.
[2] | The NDT Fund Investments table excludes foreign currency of $2 million as of December 31, 2020, which is part of the NDT Fund.

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