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Trust Investments (Proceeds From The Sales Of And The Net Realized Gains On Securities) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of Trust Investments [Line Items] |  |  |  |  |
Net Gains (Losses) on Trust Investments |  | $ 194 |  | $ 253 | $ 260
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale | [1] | 1,930 |  | 2,031 | 1,614
Gross Realized Gains |  | 236 |  | 214 | 107
Gross Realized Losses |  | (70) |  | (94) | (53)
Net Realized Gains (Losses) | [2] | 166 |  | 120 | 54
Unrealized Gain (Loss) on Securities |  | 19 |  | 120 | 196
Other than Temporary Impairment Losses, Investments |  | 0 | [3] | (3) | 0
Net Gains (Losses) on Trust Investments |  | 185 |  | 237 | 250
Rabbi Trust [Member] |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale |  | 170 |  | 203 | 173
Gross Realized Gains |  | 16 |  | 19 | 7
Gross Realized Losses |  | (8) |  | (6) | (3)
Net Realized Gains (Losses) |  | 8 |  | 13 | 4
Unrealized Gain (Loss) on Securities |  | 1 |  | 3 | 6
Net Gains (Losses) on Trust Investments |  | $ 9 |  | $ 16 | $ 10
[1] | Includes activity in accounts related to the liquidation of funds being transitioned within the trust.
[2] | The cost of these securities was determined on the basis of specific identification.
[3] | PSEG Power recognized an impairment of available-for-sale debt securities in 2020. PSEG Power’s policy is to sell all 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=123581744&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=123367319&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=123570139&loc=d3e3602-108585 + Details
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