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Trust Investments (Fair Values And Gross Unrealized Gains And Losses For The Securities) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | $ 228 |  | $ 228
Gross Unrealized Gains | 18 |  | 2
Gross Unrealized Losses | 0 |  | (6)
Fair Value | 246 |  | 224
Rabbi Trust [Member] | Domestic Equity Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 21 |  | 22
Equity Securities, FV-NI, Unrealized Gain | 7 |  | 1
Gross Unrealized Losses | 0 |  | 0
Fair Value | 28 |  | 23
Rabbi Trust [Member] | International Equity Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 0 |  | 0
Equity Securities, FV-NI, Unrealized Gain | 0 |  | 0
Gross Unrealized Losses | 0 |  | 0
Fair Value | 0 |  | 0
Rabbi Trust [Member] | Equity Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 21 |  | 22
Equity Securities, FV-NI, Unrealized Gain | 7 |  | 1
Gross Unrealized Losses | 0 |  | 0
Fair Value | 28 |  | 23
Unrealized Gains (Losses) on Equity Securities still held | 6 |  |
Rabbi Trust [Member] | Government Obligations [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 100 |  | 110
Gross Unrealized Gains | 4 |  | 1
Gross Unrealized Losses | 0 |  | (2)
Fair Value | 104 |  | 109
Rabbi Trust [Member] | Corporate Debt Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 107 |  | 96
Gross Unrealized Gains | 7 |  | 0
Gross Unrealized Losses | 0 |  | (4)
Fair Value | 114 |  | 92
Rabbi Trust [Member] | Debt Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | 8 |  |
Cost | 207 |  | 206
Gross Unrealized Gains | 11 |  | 1
Gross Unrealized Losses | 0 |  | (6)
Fair Value | 218 |  | 201
PSEG Power LLC | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 1,858 |  | 1,769
Gross Unrealized Gains | 374 |  | 192
Gross Unrealized Losses | (18) |  | (83)
Fair Value | 2,214 | [1] | 1,878
PSEG Power LLC | Nuclear Decommissioning Trust (NDT) Fund [Member] | Domestic Equity Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 425 |  | 447
Equity Securities, FV-NI, Unrealized Gain | 238 |  | 153
Gross Unrealized Losses | (4) |  | (29)
Fair Value | 659 |  | 571
PSEG Power LLC | Nuclear Decommissioning Trust (NDT) Fund [Member] | International Equity Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 400 |  | 323
Equity Securities, FV-NI, Unrealized Gain | 103 |  | 36
Gross Unrealized Losses | (11) |  | (30)
Fair Value | 492 |  | 329
PSEG Power LLC | Nuclear Decommissioning Trust (NDT) Fund [Member] | Equity Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 825 |  | 770
Equity Securities, FV-NI, Unrealized Gain | 341 |  | 189
Gross Unrealized Losses | (15) |  | (59)
Fair Value | 1,151 |  | 900
Unrealized Gains (Losses) on Equity Securities still held | 194 |  |
PSEG Power LLC | Nuclear Decommissioning Trust (NDT) Fund [Member] | Government Obligations [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 563 |  | 498
Gross Unrealized Gains | 16 |  | 2
Gross Unrealized Losses | (2) |  | (9)
Fair Value | 577 |  | 491
PSEG Power LLC | Nuclear Decommissioning Trust (NDT) Fund [Member] | Corporate Debt Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 470 |  | 501
Gross Unrealized Gains | 17 |  | 1
Gross Unrealized Losses | (1) |  | (15)
Fair Value | 486 |  | 487
PSEG Power LLC | Nuclear Decommissioning Trust (NDT) Fund [Member] | Debt Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | 17 |  |
Cost | 1,033 |  | 999
Gross Unrealized Gains | 33 |  | 3
Gross Unrealized Losses | (3) |  | (24)
Fair Value | $ 1,063 |  | $ 978
[1] | The NDT Fund Investments table excludes foreign currency of $2 million as of December 31, 2019, which is part of the NDT Fund.

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