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Trust Investments (Proceeds From The Sales Of And The Net Realized Gains On Securities in the NDT and Rabbi Trusts) (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Schedule of Trust Investments [Line Items] |  |  |  |
Net Gains (Losses) on Trust Investments |  | $ (221) |  | $ 128
Rabbi Trust [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Proceeds from Sales | [1] | 54 |  | 44
Gross Realized Gains |  | 5 |  | 1
Gross Realized Losses |  | (1) |  | (1)
Net Realized Gains (Losses) | [2] | 4 |  | 0
Unrealized Gain (Loss) on Equity Securities |  | (5) |  | 3
Net Gains (Losses) on Trust Investments |  | (1) |  | 3
PSEG Power [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Net Gains (Losses) on Trust Investments |  | (220) |  | 126
PSEG Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |
Proceeds from Sales | [3] | 555 |  | 453
Gross Realized Gains |  | 38 |  | 45
Gross Realized Losses |  | (34) |  | (19)
Net Realized Gains (Losses) | [4] | 4 |  | 26
Unrealized Gain (Loss) on Equity Securities |  | (221) |  | 99
Unrealized Losses on Debt Securities |  | (3) | [5] | 0
Net Gains (Losses) on Trust Investments |  | $ (220) |  | $ 125
[1] | Includes activity in accounts related to the liquidation of funds being transitioned to new managers.
[2] | The cost of these securities was determined on the basis of specific identification.
[3] | Includes activity in accounts related to the liquidation of funds being transitioned to new managers.
[4] | The cost of these securities was determined on the basis of specific identification.
[5] | PSEG Power recognized an impairment of available-for-sale debt securities that it intends to sell. PSEG Power’s policy is to sell all such securities that are rated below investment grade.

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- Definition Amount of realized and unrealized gain (loss) on investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27405-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=118954083&loc=SL6284422-111562 + Details
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- Definition Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3151-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26853-111562 + Details
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- Definition The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
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