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Available-For-Sale Securities (Fair Values And Gross Unrealized Gains And Losses For The Securities) (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Rabbi Trust [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 67 | $ 106 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 1 | 4 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 34 | 4 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 1 | 0 |
Cost |  | 227 | 209 |
Gross Unrealized Gains |  | 6 | 12 |
Gross Unrealized Losses |  | (2) | (4) |
Fair Value |  | 231 | 217 |
Rabbi Trust [Member] | Domestic Equity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | [1] | 0 | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | [1] | 0 | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | [1] | 0 | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | [1] | 0 | 0 |
Cost |  | 22 | 11 |
Gross Unrealized Gains |  | 3 | 11 |
Gross Unrealized Losses |  | 0 | 0 |
Fair Value |  | 25 | 22 |
Rabbi Trust [Member] | International Equity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | [1] | 0 | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | [1] | 0 | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | [1] | 0 | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | [1] | 0 | 0 |
Cost |  | 0 | 0 |
Gross Unrealized Gains |  | 0 | 0 |
Gross Unrealized Losses |  | 0 | 0 |
Fair Value |  | 0 | 0 |
Rabbi Trust [Member] | Equity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | [1] | 0 | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | [1] | 0 | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | [1] | 0 | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | [1] | 0 | 0 |
Cost |  | 22 | 11 |
Gross Unrealized Gains |  | 3 | 11 |
Gross Unrealized Losses |  | 0 | 0 |
Fair Value |  | 25 | 22 |
Rabbi Trust [Member] | Government Obligations [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | [2] | 28 | 60 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | [2] | 0 | 2 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | [2] | 25 | 1 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | [2] | 1 | 0 |
Cost |  | 85 | 105 |
Gross Unrealized Gains |  | 1 | 0 |
Gross Unrealized Losses |  | (1) | (2) |
Fair Value |  | 85 | 103 |
Rabbi Trust [Member] | Corporate Debt Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | [3] | 39 | 46 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | [3] | 1 | 2 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | [3] | 9 | 3 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | [3] | 0 | 0 |
Cost |  | 118 | 92 |
Gross Unrealized Gains |  | 2 | 1 |
Gross Unrealized Losses |  | (1) | (2) |
Fair Value |  | 119 | 91 |
Rabbi Trust [Member] | Total Debt Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 67 | 106 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 1 | 4 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 34 | 4 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 1 | 0 |
Cost |  | 203 | 197 |
Gross Unrealized Gains |  | 3 | 1 |
Gross Unrealized Losses |  | (2) | (4) |
Fair Value |  | 204 | 194 |
Rabbi Trust [Member] | Other Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cost |  | 2 | 1 |
Gross Unrealized Gains |  | 0 | 0 |
Gross Unrealized Losses |  | 0 | 0 |
Fair Value |  | 2 | 1 |
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 603 | 535 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 8 | 19 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 120 | 27 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 3 | 2 |
Cost |  | 1,794 | 1,604 |
Gross Unrealized Gains |  | 350 | 275 |
Gross Unrealized Losses |  | (11) | (21) |
Fair Value |  | 2,133 | 1,858 | [4]
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Domestic Equity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | [5] | 40 | 51 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | [5] | 2 | 3 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | [5] | 0 | 2 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | [5] | 0 | 0 |
Cost |  | 405 | 439 |
Gross Unrealized Gains |  | 245 | 214 |
Gross Unrealized Losses |  | (2) | (3) |
Fair Value |  | 648 | 650 |
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | International Equity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | [5] | 29 | 69 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | [5] | 3 | 7 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | [5] | 2 | 6 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | [5] | 0 | 1 |
Cost |  | 311 | 266 |
Gross Unrealized Gains |  | 99 | 49 |
Gross Unrealized Losses |  | (3) | (8) |
Fair Value |  | 407 | 307 |
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Equity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | [5] | 69 | 120 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | [5] | 5 | 10 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | [5] | 2 | 8 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | [5] | 0 | 1 |
Cost |  | 716 | 705 |
Gross Unrealized Gains |  | 344 | 263 |
Gross Unrealized Losses |  | (5) | (11) |
Fair Value |  | 1,055 | 957 |
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Government Obligations [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | [6] | 343 | 276 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | [6] | 2 | 6 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | [6] | 91 | 4 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | [6] | 2 | 0 |
Cost |  | 586 | 518 |
Gross Unrealized Gains |  | 2 | 8 |
Gross Unrealized Losses |  | (4) | (6) |
Fair Value |  | 584 | 520 |
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Corporate Debt Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | [7] | 191 | 139 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | [7] | 1 | 3 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | [7] | 27 | 15 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | [7] | 1 | 1 |
Cost |  | 400 | 337 |
Gross Unrealized Gains |  | 4 | 4 |
Gross Unrealized Losses |  | (2) | (4) |
Fair Value |  | 402 | 337 |
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Total Debt Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 534 | 415 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 3 | 9 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 118 | 19 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 3 | 1 |
Cost |  | 986 | 855 |
Gross Unrealized Gains |  | 6 | 12 |
Gross Unrealized Losses |  | (6) | (10) |
Fair Value |  | 986 | 857 |
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Other Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cost |  | 92 | 44 |
Gross Unrealized Gains |  | 0 | 0 |
Gross Unrealized Losses |  | 0 | 0 |
Fair Value |  | 92 | 44 |
Power [Member] | Rabbi Trust [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Fair Value |  | $ 57 | $ 53 |
[1] | Equity Securities—Investments in marketable equity securities within the Rabbi Trust Fund are through a mutual fund which invests primarily in common stocks within a broad range of industries and sectors.
[2] | Debt Securities (Government)—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 before recovery 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, 2017.
[3] | Debt Securities (Corporate)—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 before recovery 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, 2017.
[4] | The NDT available-for-sale securities table excludes cash of $1 million as of December 31, 2016, which is part of the NDT Fund.
[5] | Equity Securities—Investments in marketable equity securities within the NDT Fund are primarily in common stocks within a broad range of industries and sectors. The unrealized losses are distributed over a broad range of securities with limited impairment durations. Power does not consider these securities to be other-than-temporarily impaired as of December 31, 2017.
[6] | Debt Securities (Government)—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 before recovery 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, 2017.
[7] | Debt Securities (Corporate)—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 before recovery 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, 2017.

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