Financial Risk Management Activities (Schedule Of Derivative Instruments Fair Value In Balance Sheets) (Detail) - USD ($) $ in Millions		Mar. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Collateral Already Posted, Aggregate Fair Value		$ 281	$ 113
Derivative Contracts, Current Assets		74	112
Derivative Contracts, Noncurrent Assets		2	29
Total Mark-to-Market Derivative Assets		76	141
Derivative Contracts, Current Liabilities		(43)	(86)
Derivative Contracts, Noncurrent Liabilities		(16)	(6)
Total Mark-to-Market Derivative (Liabilities)		(59)	(92)
Net Mark-to-Market Derivative Assets (Liabilities)		17	49
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1]	198	22
PSEG Power [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets		65	106
Derivative Contracts, Noncurrent Assets		2	29
Total Mark-to-Market Derivative Assets		67	135
Derivative Contracts, Current Liabilities		(43)	(70)
Derivative Contracts, Noncurrent Liabilities		(16)	(5)
Total Mark-to-Market Derivative (Liabilities)		(59)	(75)
Net Mark-to-Market Derivative Assets (Liabilities)		8	60
Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net		83	8
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net			(1)
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net		115	15
Energy-Related Contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets		697	912
Derivative Contracts, Noncurrent Assets		444	440
Total Mark-to-Market Derivative Assets		1,141	1,352
Derivative Contracts, Current Liabilities		(790)	(890)
Derivative Contracts, Noncurrent Liabilities		(541)	(424)
Total Mark-to-Market Derivative (Liabilities)		(1,331)	(1,314)
Net Mark-to-Market Derivative Assets (Liabilities)		(190)	38
Energy-Related Contracts [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1]	525	419
Energy-Related Contracts [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1]	(632)	(806)
Energy-Related Contracts [Member] | Other Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1]	(442)	(411)
Energy-Related Contracts [Member] | Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1],[2],[3]	(1,074)	(1,217)
Energy-Related Contracts [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1]	747	820
Energy-Related Contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1],[2],[3]	1,272	1,239
Interest Rate Swap [Member] | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets		9	6
Derivative Contracts, Noncurrent Assets		0	0
Total Mark-to-Market Derivative Assets		9	6
Derivative Contracts, Current Liabilities		0	(16)
Derivative Contracts, Noncurrent Liabilities		0	(1)
Total Mark-to-Market Derivative (Liabilities)		0	(17)
Net Mark-to-Market Derivative Assets (Liabilities)		$ 9	(11)
Interest Rate Swap [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	[3],[4]		$ 0

[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.

[2] Level 1—These contracts represent natural gas futures contracts executed on NYMEX, and are being valued solely on settled pricing inputs which come directly from the exchange. Level 2—Fair values for energy-related contracts are obtained primarily using a market-based approach. Most derivative contracts (forward purchase or sale contracts and swaps) are valued using settled prices from similar assets and liabilities from an exchange, such as NYMEX, ICE and Nodal Exchange, or auction prices. Prices used in the valuation process are also corroborated independently by management to determine that values are based on actual transaction data or, in the absence of transactions, bid and offers for the day. Examples may include certain exchange and non-exchange traded capacity and electricity contracts and natural gas physical or swap contracts based on market prices, basis adjustments and other premiums where adjustments and premiums are not considered significant to the overall inputs. Level 3—Unobservable inputs are used for the valuation of certain contracts. See “Additional Information Regarding Level 3 Measurements” for more information on the utilization of unobservable inputs.

[3] Represents the netting of fair value balances with the same counterparty (where the right of offset exists) and the application of collateral. See Note 11. Financial Risk Management Activities for additional detail.

[4] Interest rate derivatives are valued using quoted prices on commonly quoted intervals, which are interpolated for periods different than the quoted intervals, as inputs to a market valuation model. Market inputs can generally be verified and model selection does not involve significant management judgement.