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.