Financial Risk Management Activities (Narrative) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax		$ (4)		$ (3)
Unrealized Loss to be Reclassified to Earnings During the Next Twelve Months		1
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1]	545		1,111
Derivative, Fair Value, Net		36		(124)
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net		1,050
Issuance of Long-term Debt		900	$ 1,750
May 2022 Term Loan
Derivatives, Fair Value [Line Items]
Short-Term Bank Loans and Notes Payable		500
PSEG Power [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives with credit-risk related contingent features		80		190
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral		6		41
Additional collateral aggregate fair value		74		149
Derivative, Fair Value, Net		38		(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		(2)		$ 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 March 31, 2023 and December 31, 2022, PSEG Power had net cash collateral (receipts) payments to counterparties of $727 million and $1,521 million, respectively. Of these net cash collateral (receipts) payments, $545 million and $1,111 million as of March 31, 2023 and December 31, 2022, respectively, were netted against the corresponding net derivative contract positions. Of the $545 million as of March 31, 2023, $(7) million was netted against current assets, $(3) million against noncurrent assets, $332 million against current liabilities and $223 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.