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Financial Risk Management Activities (Narrative) (Detail) $ / Derivative in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 USD ($) $ / Derivative | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($)
Derivatives, Fair Value [Line Items] |  |  |  |
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax |  | $ 21 |  | $ 3
Unrealized Gain to be Reclassified to Earnings During the Next Twelve Months |  | 8 |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1] | 198 |  | 22
Derivative, Fair Value, Net |  | 17 |  | 49
Issuance of Long-term Debt |  | 2,250 | $ 900 |
PSEG Power [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value of Derivatives with credit-risk related contingent features |  | 86 |  | 77
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral |  | 42 |  | 3
Additional collateral aggregate fair value |  | 44 |  | 74
Derivative, Fair Value, Net |  | 8 |  | 60
Public Service Electric and Gas Company [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Issuance of Long-term Debt |  | 1,000 | $ 900 |
Interest Rate Swap [Member] | Designated as Hedging Instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Fair Value, Net |  | 9 |  | $ (11)
Treasury Lock |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Interest Rate Hedge outstanding |  |  |  | 1,000
Derivative, Fair Value, Net |  | 4 |  |
Three Year Variable rate term loan |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net |  | 1,750 |  |
Three Year Variable rate term loan | PSEG Power [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Issuance of Long-term Debt |  | 1,250 |  |
Three Year Variable rate term loan | Interest Rate Swap [Member] | Designated as Hedging Instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Fair Value, Net |  | 9 |  | $ 5
March 2024 Senior Notes issuance | PSEG [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Long-term Debt, Gross |  | $ 1,250 |  |
Parent Variable Rate Term Loan | Interest Rate Swap [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Interest Rate Hedge outstanding | $ / Derivative |  | 500 |  |
[1] | Represents the netting of fair value balances with the same counterparty (where the right of offset exists) and the application of cash collateral. All cash collateral (received) posted that has been allocated to derivative positions, where the right of offset exists, has been offset on the Condensed Consolidated Balance Sheets. As of March 31, 2024 and December 31, 2023, PSEG Power had net cash collateral (receipts) payments to counterparties of $281 million and $113 million, respectively. Of these net cash collateral (receipts) payments, $198 million and $22 million as of March 31, 2024 and December 31, 2023, respectively, were netted against the corresponding net derivative contract positions. Of the $198 million as of March 31, 2024, $115 million was netted against current liabilities and $83 million against noncurrent liabilities. Of the $22 million as of December 31, 2023, $(1) million was netted against current assets, $15 million against current liabilities and $8 million against noncurrent liabilities.

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- Definition The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4H + Details
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- Definition Amount, after tax, of accumulated gain (loss) on derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-11 + Details
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