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Financial Risk Management Activities (Narrative) (Detail) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Derivatives, Fair Value [Line Items] |  |  |  |
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax |  | $ 18 |  | $ (3)
Unrealized Gain to be Reclassified to Earnings During the Next Twelve Months |  | 8 |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1] | 243 |  | 1,111
Derivative, Fair Value, Net |  | 41 |  | (124)
Issuance of Long-term Debt |  | 1,800 | $ 1,750 |
PSEG Power [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value of Derivatives with credit-risk related contingent features |  | 74 |  | 190
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral |  | 12 |  | 41
Additional collateral aggregate fair value |  | 62 |  | 149
Derivative, Fair Value, Net |  | 13 |  | (125)
Public Service Electric and Gas Company [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Issuance of Long-term Debt |  | 1,800 | $ 500 |
Interest Rate Swap [Member] | Designated as Hedging Instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Fair Value, Net |  | 28 |  | 1
Three Year Variable rate term loan |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net |  | 900 |  |
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 |  | 14 |  | $ 1
Parent October 2023 issuance |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Fair Value, Net |  | 14 |  |
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net |  | $ 800 |  |
[1] | Represents the netting of fair value balances with the same counterparty (where the right of offset exists) and the application of 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 September 30, 2023 and December 31, 2022, PSEG Power had net cash collateral (receipts) payments to counterparties of $346 million and $1,521 million, respectively. Of these net cash collateral (receipts) payments, $243 million and $1,111 million as of September 30, 2023 and December 31, 2022, respectively, were netted against the corresponding net derivative contract positions. Of the $243 million as of September 30, 2023, $152 million was netted against current liabilities and $91 million against noncurrent liabilities. Of the $1,111 million as of December 31, 2022, $616 million was netted against current liabilities and $495 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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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480870/815-30-50-1 + Details
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