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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Net Gains (Losses) on Trust Investments |  | $ 39 |  | $ 8 |  | $ 167 |  | $ (14) |  |
PSEG Power [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Net Gains (Losses) on Trust Investments |  | 38 |  | 8 |  | 164 |  | (14) |  |
Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |  |  |  |
NDT Fund Cash |  | 1 |  |  |  | 1 |  |  |  |
Proceeds from Sales | [1] | 427 |  | 402 |  | 880 |  | 774 |  |
Trust Investments, Cost |  | 1,826 |  |  |  | 1,826 |  |  |  | $ 1,769
Gross Unrealized Gains |  | 314 |  |  |  | 314 |  |  |  | 192
Gross Unrealized Losses |  | (24) |  |  |  | (24) |  |  |  | (83)
Trust Investments, Fair Value |  | 2,116 | [2] |  |  | 2,116 | [2] |  |  | 1,878
Gross Realized Gains |  | 18 |  | 34 |  | 63 |  | 58 |  |
Available-for-sale Securities, Gross Realized Losses |  | 13 |  | 10 |  | 32 |  | 22 |  |
Realized Investment Gains (Losses) | [3] | 5 |  | 24 |  | 31 |  | 36 |  |
Unrealized Gain (Loss) on Securities |  | 33 |  | (16) |  | 132 |  | (50) |  |
Net Gains (Losses) on Trust Investments |  | 38 |  | 8 |  | 163 |  | (14) |  |
NDT Fund Foreign Currency |  | 1 |  |  |  | 1 |  |  |  |
Rabbi Trust [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from Sales |  | 42 | [1] | 22 | [1] | 86 | [4] | 47 | [4] |
Trust Investments, Cost |  | 226 |  |  |  | 226 |  |  |  | 228
Gross Unrealized Gains |  | 14 |  |  |  | 14 |  |  |  | 2
Gross Unrealized Losses |  | 0 |  |  |  | 0 |  |  |  | (6)
Trust Investments, Fair Value |  | 240 |  |  |  | 240 |  |  |  | 224
Gross Realized Gains |  | 1 |  | 0 |  | 2 |  | 2 |  |
Available-for-sale Securities, Gross Realized Losses |  | 0 |  | 0 |  | 1 |  | 2 |  |
Realized Investment Gains (Losses) | [5] | 1 |  | 0 |  | 1 |  | 0 |  |
Unrealized Gain (Loss) on Securities |  | 0 |  | 0 |  | 3 |  | 0 |  |
Net Gains (Losses) on Trust Investments |  | 1 |  | $ 0 |  | 4 |  | $ 0 |  |
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 |  | 1,025 |  |  |  | 1,025 |  |  |  | 999
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 31 |  |  |  | 31 |  |  |  | 3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 3 |  |  |  | 3 |  |  |  | 24
Debt Securities, Available-for-Sale, Fair Value |  | 1,053 |  |  |  | 1,053 |  |  |  | 978
Total Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 204 |  |  |  | 204 |  |  |  | 206
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 10 |  |  |  | 10 |  |  |  | 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 0 |  |  |  | 0 |  |  |  | 6
Debt Securities, Available-for-Sale, Fair Value |  | 214 |  |  |  | 214 |  |  |  | 201
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Securities, Cost |  | 801 |  |  |  | 801 |  |  |  | 770
Equity Securities, Accumulated Gross Unrealized Gain |  |  |  |  |  | 283 |  |  |  | 189
Equity Securities, Accumulated Gross Unrealized Loss |  |  |  |  |  | 21 |  |  |  | 59
Equity Securities, Fair Value |  | 1,063 |  |  |  | 1,063 |  |  |  | 900
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 |  | 477 |  |  |  | 477 |  |  |  | 501
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 15 |  |  |  | 15 |  |  |  | 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 2 |  |  |  | 2 |  |  |  | 15
Debt Securities, Available-for-Sale, Fair Value |  | 490 |  |  |  | 490 |  |  |  | 487
Corporate Debt Obligations [Member] | Rabbi Trust [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 103 |  |  |  | 103 |  |  |  | 96
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 5 |  |  |  | 5 |  |  |  | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 0 |  |  |  | 0 |  |  |  | 4
Debt Securities, Available-for-Sale, Fair Value |  | 108 |  |  |  | 108 |  |  |  | 92
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 |  | 548 |  |  |  | 548 |  |  |  | 498
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 16 |  |  |  | 16 |  |  |  | 2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 1 |  |  |  | 1 |  |  |  | 9
Debt Securities, Available-for-Sale, Fair Value |  | 563 |  |  |  | 563 |  |  |  | 491
Government Debt Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 101 |  |  |  | 101 |  |  |  | 110
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 5 |  |  |  | 5 |  |  |  | 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 0 |  |  |  | 0 |  |  |  | 2
Debt Securities, Available-for-Sale, Fair Value |  | 106 |  |  |  | 106 |  |  |  | 109
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Securities, Cost |  | 384 |  |  |  | 384 |  |  |  | 323
Equity Securities, Accumulated Gross Unrealized Gain |  |  |  |  |  | 82 |  |  |  | 36
Equity Securities, Accumulated Gross Unrealized Loss |  |  |  |  |  | 16 |  |  |  | 30
Equity Securities, Fair Value |  | 450 |  |  |  | 450 |  |  |  | 329
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Securities, Cost |  | 417 |  |  |  | 417 |  |  |  | 447
Equity Securities, Accumulated Gross Unrealized Gain |  |  |  |  |  | 201 |  |  |  | 153
Equity Securities, Accumulated Gross Unrealized Loss |  |  |  |  |  | 5 |  |  |  | 29
Equity Securities, Fair Value |  | 613 |  |  |  | 613 |  |  |  | 571
Domestic Equity Securities [Member] | Rabbi Trust [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Securities, Cost |  | 22 |  |  |  | 22 |  |  |  | 22
Equity Securities, Accumulated Gross Unrealized Gain |  |  |  |  |  | 4 |  |  |  | 1
Equity Securities, Accumulated Gross Unrealized Loss |  |  |  |  |  | 0 |  |  |  | 0
Equity Securities, Fair Value |  | $ 26 |  |  |  | $ 26 |  |  |  | $ 23
[1] | Includes activity in accounts related to the liquidation of funds being transitioned to new managers.
[2] | The NDT Fund Investments table excludes cash of $1 million and foreign currency of $1 million as of June 30, 2019, which are 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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