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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, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Schedule of Trust Investments [Line Items] |  |  |  |  |
Net Gains (Losses) on Trust Investments |  | $ (221) |  | $ 128 |
PSEG Power [Member] |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |
Net Gains (Losses) on Trust Investments |  | (220) |  | 126 |
Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |
Proceeds from Sales | [1] | 555 |  | 453 |
Trust Investments, Cost |  | 1,882 |  |  | $ 1,858
Gross Unrealized Gains |  | 232 |  |  | 374
Gross Unrealized Losses |  | (87) |  |  | (18)
Trust Investments, Fair Value |  | 2,027 | [2] |  | 2,214
Gross Realized Gains |  | 38 |  | 45 |
Available-for-sale Securities, Gross Realized Losses |  | 34 |  | 19 |
Realized Investment Gains (Losses) | [3] | 4 |  | 26 |
Unrealized Gain (Loss) on Equity Securities |  | (221) |  | 99 |
Net Gains (Losses) on Trust Investments |  | (220) |  | 125 |
NDT Fund Foreign Currency |  |  |  |  | 2
Rabbi Trust [Member] |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |
Proceeds from Sales | [4] | 54 |  | 44 |
Trust Investments, Cost |  | 229 |  |  | 228
Gross Unrealized Gains |  | 18 |  |  | 18
Gross Unrealized Losses |  | (3) |  |  | 0
Trust Investments, Fair Value |  | 244 |  |  | 246
Gross Realized Gains |  | 5 |  | 1 |
Available-for-sale Securities, Gross Realized Losses |  | 1 |  | 1 |
Realized Investment Gains (Losses) | [5] | 4 |  | 0 |
Unrealized Gain (Loss) on Equity Securities |  | (5) |  | 3 |
Net Gains (Losses) on Trust Investments |  | (1) |  | $ 3 |
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 |  | 1,051 |  |  | 1,033
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 52 |  |  | 33
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 12 |  |  | 3
Debt Securities, Available-for-Sale, Fair Value |  | 1,091 |  |  | 1,063
Total Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 208 |  |  | 207
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 17 |  |  | 11
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 3 |  |  | 0
Debt Securities, Available-for-Sale, Fair Value |  | 222 |  |  | 218
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |
Equity Securities, Cost |  | 831 |  |  | 825
Equity Securities, Accumulated Gross Unrealized Gain |  | 180 |  |  | 341
Equity Securities, Accumulated Gross Unrealized Loss |  | 75 |  |  | 15
Equity Securities, Fair Value |  | 936 |  |  | 1,151
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 |  | 525 |  |  | 470
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 13 |  |  | 17
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 11 |  |  | 1
Debt Securities, Available-for-Sale, Fair Value |  | 527 |  |  | 486
Corporate Debt Obligations [Member] | Rabbi Trust [Member] |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 111 |  |  | 107
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 4 |  |  | 7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 3 |  |  | 0
Debt Securities, Available-for-Sale, Fair Value |  | 112 |  |  | 114
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 |  | 526 |  |  | 563
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 39 |  |  | 16
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 1 |  |  | 2
Debt Securities, Available-for-Sale, Fair Value |  | 564 |  |  | 577
Government Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 97 |  |  | 100
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 13 |  |  | 4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 0 |  |  | 0
Debt Securities, Available-for-Sale, Fair Value |  | 110 |  |  | 104
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |
Equity Securities, Cost |  | 386 |  |  | 400
Equity Securities, Accumulated Gross Unrealized Gain |  | 33 |  |  | 103
Equity Securities, Accumulated Gross Unrealized Loss |  | 48 |  |  | 11
Equity Securities, Fair Value |  | 371 |  |  | 492
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |
Equity Securities, Cost |  | 445 |  |  | 425
Equity Securities, Accumulated Gross Unrealized Gain |  | 147 |  |  | 238
Equity Securities, Accumulated Gross Unrealized Loss |  | 27 |  |  | 4
Equity Securities, Fair Value |  | 565 |  |  | 659
Domestic Equity Securities [Member] | Rabbi Trust [Member] |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |
Equity Securities, Cost |  | 21 |  |  | 21
Equity Securities, Accumulated Gross Unrealized Gain |  | 1 |  |  | 7
Equity Securities, Accumulated Gross Unrealized Loss |  | 0 |  |  | 0
Equity Securities, Fair Value |  | $ 22 |  |  | $ 28
[1] | Includes activity in accounts related to the liquidation of funds being transitioned to new managers.
[2] | The NDT Fund Investments table excludes foreign currency of $2 million as of December 31, 2019, which is part of the NDT Fund.
[3] | The cost of these securities was determined on the basis of specific identification.
[4] | Includes activity in accounts related to the liquidation of funds being transitioned to new managers.
[5] | The cost of these securities was determined on the basis of specific identification.

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