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.