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Financial Risk Management Activities (Narrative) (Detail) $ / Derivative in Millions, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) $ / Derivative | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Oct. 31, 2023 USD ($)
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative, Fair Value, Net | $ 49 |  | $ 49 | $ (124) |  |
Credit Risk Derivative Liabilities, at Fair Value | 77 |  | 77 | 190 |  |
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral | 3 |  | 3 | 41 |  |
Additional collateral aggregate fair value | 74 |  | 74 | 149 |  |
Proceeds from Short-term Debt |  |  | 750 | 2,000 | $ 2,500 |
Long-term Debt | 19,411 |  | 19,411 |  |  |
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax | 3 |  | 3 | (3) |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  | 3 |  |  |
PSEG [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Long-term Debt | 4,396 |  | 4,396 | 4,146 |  |
PSEG Power LLC [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative, Fair Value, Net | 60 |  | 60 | (125) |  |
Long-term Debt | 1,250 |  | 1,250 | 1,250 |  |
Senior Notes Three Point Eight Five Percent due Two Thousand Twenty Three [Member] | PSEG Power LLC [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Long-term Debt | 1,250 |  | 1,250 | 1,250 |  |
Senior Notes Five Point Eight Five Percent Due In Two Thousand Twenty Seven | PSEG [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Long-term Debt | 700 |  | 700 | 700 |  |
Three Year Variable rate term loan | PSEG Power LLC [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Long-term Debt | 1,250 |  | $ 1,250 |  |  |
Interest Rate Swaps [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Underlying, Derivative | $ / Derivative |  |  | 1,400 |  |  |
Interest Rate Swaps [Member] | Designated as Hedging Instrument |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative, Fair Value, Net | $ 5 |  | $ 5 | $ 1 |  |
Interest Rate Swaps [Member] | Three Year Variable rate term loan | PSEG Power LLC [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Underlying, Derivative | $ / Derivative |  |  | 900 |  |  |
Interest Rate Swaps [Member] | Parent Variable Rate Term Loan |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Underlying, Derivative | $ / Derivative |  |  | 500 |  |  |
Treasury Lock |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Underlying, Derivative | 600 | 800 |  |  |  |
Derivative, Fair Value, Net | $ (16) |  | $ (16) |  |  | $ 17

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