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Trust Investments (Value Of Securities That Have Been In An Unrealized Loss Position For Less Than And Greater Than 12 Months) (Detail) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value of Equity Securities in Unrealized Loss Position, Less Than 12 Months |  | $ 600 | $ 152
Gross Unrealized Losses on Equity Securities, Less Than 12 Months |  | (25) | (6)
Fair Value of Equity Securities in Unrealized Loss Position, Greater Than 12 Months |  | 32 | 40
Gross Unrealized Losses on Equity Securities, Greater Than 12 Months |  | (4) | (8)
Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value of Equity Securities in Unrealized Loss Position, Less Than 12 Months |  | 105 | 21
Gross Unrealized Losses on Equity Securities, Less Than 12 Months |  | (6) | 0
Fair Value of Equity Securities in Unrealized Loss Position, Greater Than 12 Months |  | 1 | 1
Gross Unrealized Losses on Equity Securities, Greater Than 12 Months |  | 0 | 0
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value of Equity Securities in Unrealized Loss Position, Less Than 12 Months | [1] | 98 | 49
Gross Unrealized Losses on Equity Securities, Less Than 12 Months | [1] | (5) | (4)
Fair Value of Equity Securities in Unrealized Loss Position, Greater Than 12 Months | [1] | 22 | 33
Gross Unrealized Losses on Equity Securities, Greater Than 12 Months | [1] | (4) | (8)
Total Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 502 | 103
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | (20) | (2)
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 10 | 7
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, |  | 0 | 0
Total Debt Securities [Member] | Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 105 | 21
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | (6) | 0
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 1 | 1
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, |  | 0 | 0
Corporate Debt Obligations [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | [2] | 203 | 31
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | [2] | (8) | (1)
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | [2] | 9 | 7
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, | [2] | 0 | 0
Corporate Debt Obligations [Member] | Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | [3] | 44 | 2
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | [3] | (2) | 0
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | [3] | 1 | 1
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, | [3] | 0 | 0
Government Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | [4] | 299 | 72
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | [4] | (12) | (1)
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | [4] | 1 | 0
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, | [4] | 0 | 0
Government Debt Securities [Member] | Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | [5] | 61 | 19
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | [5] | (4) | 0
Fair Value of Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | [5] | 0 | 0
Gross Unrealized Losses on Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, | [5] | 0 | 0
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value of Equity Securities in Unrealized Loss Position, Less Than 12 Months | [1] | 42 | 26
Gross Unrealized Losses on Equity Securities, Less Than 12 Months | [1] | (4) | (2)
Fair Value of Equity Securities in Unrealized Loss Position, Greater Than 12 Months | [1] | 20 | 27
Gross Unrealized Losses on Equity Securities, Greater Than 12 Months | [1] | (4) | (7)
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Fair Value of Equity Securities in Unrealized Loss Position, Less Than 12 Months | [1] | 56 | 23
Gross Unrealized Losses on Equity Securities, Less Than 12 Months | [1] | (1) | (2)
Fair Value of Equity Securities in Unrealized Loss Position, Greater Than 12 Months | [1] | 2 | 6
Gross Unrealized Losses on Equity Securities, Greater Than 12 Months | [1] | $ 0 | $ (1)
[1] | Equity Securities—Investments in marketable equity securities within the NDT Fund are primarily in common stocks within a broad range of industries and sectors. Unrealized gains and losses on these securities are recorded in Net Income.
[2] | Debt Securities (Corporate)—Unrealized gains and losses on these securities are recorded in Accumulated Other Comprehensive Income (Loss). Unrealized losses were due to market declines. It is not expected that these securities would settle for less than their amortized cost. PSEG Power does not intend to sell these securities nor will it be more-likely-than-not required to sell before recovery of their amortized cost. PSEG Power did not recognize credit losses for these corporate bonds because they are primarily investment grade securities.
[3] | Debt Securities (Corporate)—Unrealized gains and losses on these securities are recorded in Accumulated Other Comprehensive Income (Loss). Unrealized losses were due to market declines. It is not expected that these securities would settle for less than their amortized cost. PSEG does not intend to sell these securities nor will it be more-likely-than-not required to sell before recovery of their amortized cost. PSEG did not recognize credit losses for these corporate bonds because they are primarily investment grade.
[4] | Debt Securities (Government)—Unrealized gains and losses on these securities are recorded in Accumulated Other Comprehensive Income (Loss). The unrealized losses on PSEG Power’s NDT investments in U.S. Treasury obligations and Federal Agency mortgage-backed securities were caused by interest rate changes. PSEG Power also has investments in municipal bonds. It is not expected that these securities will settle for less than their amortized cost. PSEG Power does not intend to sell these securities nor will it be more-likely-than-not required to sell before recovery of their amortized cost. PSEG Power did not recognize credit losses for U.S. Treasury obligations and Federal Agency mortgage-backed securities because these investments are guaranteed by the U.S. government or an agency of the U.S. government. PSEG Power did not recognize credit losses for municipal bonds because they are primarily investment grade securities.
[5] | 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. PSEG also has investments in municipal bonds. It is not expected that these securities will settle for less than their amortized cost. PSEG does not intend to sell these securities nor will it be more-likely-than-not required to sell before recovery of their amortized cost. PSEG did not recognize credit losses for U.S. Treasury obligations and Federal Agency mortgage-backed securities because these investments are guaranteed by the U.S. government or an agency of the U.S. government. PSEG did not recognize credit losses for municipal bonds because they are primarily investment grade securities.

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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