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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |  |
Net Gains (Losses) on Trust Investments |  | $ 81 |  | $ 201 |  | $ 141 |  | $ (20)
Rabbi Trust [Member] |  |  |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |  |
Proceeds from Sales |  | 29 | [1] | 61 | [1] | 94 |  | 115
Gross Realized Gains |  | 2 |  | 5 |  | 7 |  | 10
Gross Realized Losses |  | (1) |  | (2) |  | (3) |  | (3)
Net Realized Gains (Losses) |  | 1 |  | 3 |  | 4 |  | 7
Unrealized Gain (Loss) on Equity Securities |  | 0 |  | 4 |  | 0 |  | (1)
Net Gains (Losses) on Trust Investments |  | 1 |  | 7 |  | 4 |  | 6
PSEG Power [Member] |  |  |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |  |
Net Gains (Losses) on Trust Investments |  | 79 |  | 196 |  | 137 |  | (24)
PSEG Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |  |
Proceeds from Sales | [1] | 538 |  | 493 |  | 1,135 |  | 1,048
Gross Realized Gains |  | 83 |  | 32 |  | 162 |  | 70
Gross Realized Losses |  | (23) |  | (20) |  | (38) |  | (54)
Net Realized Gains (Losses) | [2] | 60 |  | 12 |  | 124 |  | 16
Unrealized Gain (Loss) on Equity Securities |  | 20 |  | 182 |  | 13 |  | (39)
Impairment of Debt Securities |  | 0 |  | 0 |  | 0 | [3] | (3)
Net Gains (Losses) on Trust Investments |  | $ 80 |  | $ 194 |  | $ 137 |  | $ (26)
[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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