Financial Risk Management Activities (Narrative) (Detail) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax		$ 20		$ 3
Unrealized Gain to be Reclassified to Earnings During the Next Twelve Months		8
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1]	57		22
Derivative, Fair Value, Net		44		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		53		77
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral		21		3
Additional collateral aggregate fair value		32		74
Derivative, Fair Value, Net		37		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		7		(11)
Three Year Variable rate term loan
Derivatives, Fair Value [Line Items]
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net		1,250
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		$ 7		$ 5

[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 June 30, 2024 and December 31, 2023, PSEG Power had net cash collateral (receipts) payments to counterparties of $137 million and $113 million, respectively. Of these net cash collateral (receipts) payments, $57 million and $22 million as of June 30, 2024 and December 31, 2023, respectively, were netted against the corresponding net derivative contract positions. Of the $57 million as of June 30, 2024, $(24) million was netted against noncurrent assets and $81 million against current 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.