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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 | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Trust Investments, Cost | $ 2,137 |  | $ 2,137 |  | $ 1,990 |
Gross Unrealized Gains | 504 |  | 504 |  | 523 |
Gross Unrealized Losses | (15) |  | (15) |  | (14) |
Trust Investments, Fair Value | 2,626 | [1] | 2,626 | [1] | 2,499 | [2]
NDT Fund Foreign Currency | 2 |  | 2 |  | 2 |
Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Trust Investments, Cost | 226 |  | 226 |  | 238 |
Gross Unrealized Gains | 21 |  | 21 |  | 28 |
Gross Unrealized Losses | (2) |  | (2) |  | 0 |
Trust Investments, Fair Value | 245 |  | 245 |  | 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 | 1,316 |  | 1,316 |  | 1,083 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 40 |  | 40 |  | 66 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (9) |  | (9) |  | (2) |
Debt Securities, Available-for-Sale, Fair Value | 1,347 |  | 1,347 |  | 1,147 |
Total Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 210 |  | 210 |  | 217 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 10 |  | 10 |  | 18 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (2) |  | (2) |  | 0 |
Debt Securities, Available-for-Sale, Fair Value | 218 |  | 218 |  | 235 |
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost | 821 |  | 821 |  | 907 |
Equity Securities, Accumulated Gross Unrealized Gain |  |  | 464 |  | 457 |
Equity Securities, FV-NI, Unrealized Loss |  |  | (6) |  | (12) |
Equity Securities, Fair Value | 1,279 |  | 1,279 |  | 1,352 |
Unrealized Gains (Losses) on Equity Securities still held | 61 |  | 86 |  |  |
Equity Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Unrealized Gains (Losses) on Equity Securities still held | 1 |  |  |  |  |
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 | 613 |  | 613 |  | 528 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 25 |  | 25 |  | 39 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (3) |  | (3) |  | (1) |
Debt Securities, Available-for-Sale, Fair Value | 635 |  | 635 |  | 566 |
Corporate Debt Obligations [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 111 |  | 111 |  | 123 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 7 |  | 7 |  | 12 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 |  | 0 |  | 0 |
Debt Securities, Available-for-Sale, Fair Value | 118 |  | 118 |  | 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 | 703 |  | 703 |  | 555 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 15 |  | 15 |  | 27 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (6) |  | (6) |  | (1) |
Debt Securities, Available-for-Sale, Fair Value | 712 |  | 712 |  | 581 |
Government Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 99 |  | 99 |  | 94 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 3 |  | 3 |  | 6 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (2) |  | (2) |  | 0 |
Debt Securities, Available-for-Sale, Fair Value | 100 |  | 100 |  | 100 |
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost | 338 |  | 338 |  | 388 |
Equity Securities, Accumulated Gross Unrealized Gain |  |  | 134 |  | 152 |
Equity Securities, FV-NI, Unrealized Loss |  |  | (6) |  | (9) |
Equity Securities, Fair Value | 466 |  | 466 |  | 531 |
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost | 483 |  | 483 |  | 519 |
Equity Securities, Accumulated Gross Unrealized Gain |  |  | 330 |  | 305 |
Equity Securities, FV-NI, Unrealized Loss |  |  | 0 |  | (3) |
Equity Securities, Fair Value | 813 |  | 813 |  | 821 |
Domestic Equity Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost | 15 |  | 15 |  | 21 |
Equity Securities, Accumulated Gross Unrealized Gain |  |  | 11 |  | 10 |
Equity Securities, FV-NI, Unrealized Loss |  |  | 0 |  | 0 |
Equity Securities, Fair Value | 26 |  | 26 |  | $ 31 |
Other Securities | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost | 1 |  | 1 |  |  |
Equity Securities, Accumulated Gross Unrealized Gain |  |  | 0 |  |  |
Equity Securities, FV-NI, Unrealized Loss |  |  | 0 |  |  |
Equity Securities, Fair Value | $ 1 |  | 1 |  |  |
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 |  |  | 18 |  |  |
Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |
After tax amount of net unrealized gains recognized in AOCI |  |  | $ 6 |  |  |
[1] | The NDT Fund Investments table excludes foreign currency of $2 million as of June 30, 2021, which is 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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