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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, 2018 | Dec. 31, 2017
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value |  | $ 978 |
Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Trust Investments, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  |  | $ 67
Trust Investments, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  |  | 1
Trust Investments, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  |  | 34
Trust Investments, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  |  | 1
Cost |  | 228 |
Gross Unrealized Gains |  | 2 |
Gross Unrealized Losses |  | (6) |
Fair Value |  | 201 |
Cost |  |  | 227
Gross Unrealized Gains |  |  | 6
Gross Unrealized Losses |  |  | (2)
Fair Value |  | 224 | 231
Rabbi Trust [Member] | Domestic Equity Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost |  | 22 |
Gross Unrealized Gains |  | 1 |
Gross Unrealized Losses |  | 0 |
Fair Value |  | 23 |
Cost |  |  | 24
Gross Unrealized Gains |  |  | 3
Gross Unrealized Losses |  |  | 0
Fair Value |  |  | 27
Rabbi Trust [Member] | International Equity Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost |  | 0 |
Gross Unrealized Gains |  | 0 |
Gross Unrealized Losses |  | 0 |
Fair Value |  | 0 |
Cost |  |  | 0
Gross Unrealized Gains |  |  | 0
Gross Unrealized Losses |  |  | 0
Fair Value |  |  | 0
Rabbi Trust [Member] | Equity Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost |  | 22 |
Gross Unrealized Gains |  | 1 |
Gross Unrealized Losses |  | 0 |
Fair Value |  | 23 |
Cost |  |  | 24
Gross Unrealized Gains |  |  | 3
Gross Unrealized Losses |  |  | 0
Fair Value |  |  | 27
Unrealized Gains (Losses) on Equity Securities still held |  | (2) |
Rabbi Trust [Member] | Government Obligations [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Trust Investments, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | [1] |  | 28
Trust Investments, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | [1] |  | 0
Trust Investments, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | [1] |  | 25
Trust Investments, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | [1] |  | 1
Cost |  | 110 |
Gross Unrealized Gains |  | 1 |
Gross Unrealized Losses |  | (2) |
Fair Value |  | 109 |
Cost |  |  | 85
Gross Unrealized Gains |  |  | 1
Gross Unrealized Losses |  |  | (1)
Fair Value |  |  | 85
Rabbi Trust [Member] | Corporate Debt Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Trust Investments, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | [2] |  | 39
Trust Investments, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | [2] |  | 1
Trust Investments, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | [2] |  | 9
Trust Investments, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | [2] |  | 0
Cost |  | 96 |
Gross Unrealized Gains |  | 0 |
Gross Unrealized Losses |  | (4) |
Fair Value |  | 92 |
Cost |  |  | 118
Gross Unrealized Gains |  |  | 2
Gross Unrealized Losses |  |  | (1)
Fair Value |  |  | 119
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 |  | (4) |
Trust Investments, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  |  | 67
Trust Investments, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  |  | 1
Trust Investments, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  |  | 34
Trust Investments, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  |  | 1
Cost |  | 206 |
Gross Unrealized Gains |  | 1 |
Gross Unrealized Losses |  | (6) |
Fair Value |  | 201 |
Cost |  |  | 203
Gross Unrealized Gains |  |  | 3
Gross Unrealized Losses |  |  | (2)
Fair Value |  |  | 204
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Trust Investments, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  |  | 603
Trust Investments, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  |  | 8
Trust Investments, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  |  | 120
Trust Investments, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  |  | 3
Cost |  | 1,769 |
Gross Unrealized Gains |  | 192 |
Gross Unrealized Losses |  | (83) |
Fair Value |  | 1,878 |
Cost |  |  | 1,794
Gross Unrealized Gains |  |  | 350
Gross Unrealized Losses |  |  | (11)
Fair Value |  |  | 2,133
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Domestic Equity Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Trust Investments, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | [3] | 147 | 40
Trust Investments, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | [3] | 26 | 2
Trust Investments, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | [3] | 5 | 0
Trust Investments, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | [3] | 3 | 0
Cost |  | 447 |
Gross Unrealized Gains |  | 153 |
Gross Unrealized Losses |  | (29) |
Fair Value |  | 571 |
Cost |  |  | 497
Gross Unrealized Gains |  |  | 245
Gross Unrealized Losses |  |  | (2)
Fair Value |  |  | 740
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | International Equity Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Trust Investments, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | [3] | 131 | 29
Trust Investments, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | [3] | 28 | 3
Trust Investments, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | [3] | 5 | 2
Trust Investments, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | [3] | 2 | 0
Cost |  | 323 |
Gross Unrealized Gains |  | 36 |
Gross Unrealized Losses |  | (30) |
Fair Value |  | 329 |
Cost |  |  | 311
Gross Unrealized Gains |  |  | 99
Gross Unrealized Losses |  |  | (3)
Fair Value |  |  | 407
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Equity Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Trust Investments, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | [3] | 278 | 69
Trust Investments, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | [3] | 54 | 5
Trust Investments, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | [3] | 10 | 2
Trust Investments, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | [3] | 5 | 0
Cost |  | 770 |
Gross Unrealized Gains |  | 189 |
Gross Unrealized Losses |  | (59) |
Fair Value |  | 900 |
Cost |  |  | 808
Gross Unrealized Gains |  |  | 344
Gross Unrealized Losses |  |  | (5)
Fair Value |  |  | 1,147
Unrealized Gains (Losses) on Equity Securities still held |  | (127) |
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Government Obligations [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Trust Investments, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | [4] |  | 343
Trust Investments, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | [4] |  | 2
Trust Investments, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | [4] |  | 91
Trust Investments, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | [4] |  | 2
Cost |  | 498 |
Gross Unrealized Gains |  | 2 |
Gross Unrealized Losses |  | (9) |
Fair Value |  | 491 |
Cost |  |  | 586
Gross Unrealized Gains |  |  | 2
Gross Unrealized Losses |  |  | (4)
Fair Value |  |  | 584
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Corporate Debt Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Trust Investments, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | [5] |  | 191
Trust Investments, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | [5] |  | 1
Trust Investments, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | [5] |  | 27
Trust Investments, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | [5] |  | 1
Cost |  | 501 |
Gross Unrealized Gains |  | 1 |
Gross Unrealized Losses |  | (15) |
Fair Value |  | 487 |
Cost |  |  | 400
Gross Unrealized Gains |  |  | 4
Gross Unrealized Losses |  |  | (2)
Fair Value |  |  | 402
Power [Member] | 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 |  | (12) |
Trust Investments, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  |  | 534
Trust Investments, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  |  | 3
Trust Investments, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  |  | 118
Trust Investments, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  |  | 3
Cost |  | 999 |
Gross Unrealized Gains |  | 3 |
Gross Unrealized Losses |  | (24) |
Fair Value |  | 978 |
Cost |  |  | 986
Gross Unrealized Gains |  |  | 6
Gross Unrealized Losses |  |  | (6)
Fair Value |  |  | 986
Power [Member] | Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value |  | $ 56 | $ 57
[1] | Debt Securities (Government)—Unrealized gains and losses on these securities are recorded in Accumulated Other Comprehensive Income (Loss). The unrealized losses on PSEG’s Rabbi Trust investments in U.S. Treasury obligations and Federal Agency mortgage-backed securities were caused by interest rate changes. These investments are guaranteed by the U.S. government or an agency of the U.S. government. PSEG also has investments in municipal bonds that are primarily in investment grade securities. It is not expected that these securities will settle for less than their amortized cost. Since PSEG does not intend to sell these securities nor will it be more-likely-than-not required to sell, PSEG does not consider these debt securities to be other-than-temporarily impaired as of December 31, 2018.
[2] | Debt Securities (Corporate)—Unrealized gains and losses on these securities are recorded in Accumulated Other Comprehensive Income (Loss). PSEG’s investments in corporate bonds are primarily in investment grade securities. It is not expected that these securities would settle for less than their amortized cost. Since PSEG does not intend to sell these securities nor will it be more-likely-than-not required to sell, PSEG does not consider these debt securities to be other-than-temporarily impaired as of December 31, 2018.
[3] | Equity Securities—Investments in marketable equity securities within the NDT Fund are primarily in common stocks within a broad range of industries and sectors. Effective January 1, 2018, unrealized gains and losses on these securities are recorded in Net Income.
[4] | Debt Securities (Government)—Unrealized gains and losses on these securities are recorded in Accumulated Other Comprehensive Income (Loss). The unrealized losses on Power’s NDT investments in U.S. Treasury obligations and Federal Agency mortgage-backed securities were caused by interest rate changes. These investments are guaranteed by the U.S. government or an agency of the U.S. government. Power also has investments in municipal bonds that are primarily in investment grade securities. It is not expected that these securities will settle for less than their amortized cost. Since Power does not intend to sell these securities nor will it be more-likely-than-not required to sell, Power does not consider these debt securities to be other-than-temporarily impaired as of December 31, 2018.
[5] | Debt Securities (Corporate)—Unrealized gains and losses on these securities are recorded in Accumulated Other Comprehensive Income (Loss). Power’s investments in corporate bonds are primarily in investment grade securities. It is not expected that these securities would settle for less than their amortized cost. Since Power does not intend to sell these securities nor will it be more-likely-than-not required to sell, Power does not consider these debt securities to be other-than-temporarily impaired as of December 31, 2018.

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