Financial Risk Management Activities (Narrative) (Detail) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax		$ 7		$ (3)
Unrealized Gain to be Reclassified to Earnings During the Next Twelve Months		5
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1]	283		1,111
Derivative, Fair Value, Net		79		(124)
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net		900
Issuance of Long-term Debt		900	$ 1,750
PSEG Power [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives with credit-risk related contingent features		76		190
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral		5		41
Additional collateral aggregate fair value		71		149
Derivative, Fair Value, Net		66		(125)
Public Service Electric and Gas Company [Member]
Derivatives, Fair Value [Line Items]
Issuance of Long-term Debt		900	$ 500
Interest Rate Swap [Member] | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net		13		$ 1
Three Year Variable rate term loan | PSEG Power [Member]
Derivatives, Fair Value [Line Items]
Issuance of Long-term Debt		$ 1,250

[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 June 30, 2023 and December 31, 2022, PSEG Power had net cash collateral (receipts) payments to counterparties of $426 million and $1,521 million, respectively. Of these net cash collateral (receipts) payments, $283 million and $1,111 million as of June 30, 2023 and December 31, 2022, respectively, were netted against the corresponding net derivative contract positions. Of the $283 million as of June 30, 2023, $(5) million was netted against current assets, $(1) million against noncurrent assets, $171 million against current liabilities and $118 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.