Financial Risk Management Activities (Schedule Of Derivative Instruments Fair Value In Balance Sheets) (Detail) - USD ($) $ in Millions		Mar. 31, 2022		Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Collateral Already Posted, Aggregate Fair Value		$ 1,527		$ 844
Derivative Contracts, Current Assets		144		72
Derivative Contracts, Noncurrent Assets		49		28
Total Mark-to-Market Derivative Assets		193		100
Derivative Contracts, Current Liabilities		(159)		(17)
Derivative Contracts, Noncurrent Liabilities		(23)		(17)
Total Mark-to-Market Derivative (Liabilities)		(182)		(34)
Net Mark-to-Market Derivative Assets (Liabilities)		11		66
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1]	1,321		615
PSEG Power [Member]
Derivatives, Fair Value [Line Items]
Collateral Already Posted, Aggregate Fair Value		1,500		343
Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net		528		335
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net		(22)		(30)
Other Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net		(15)		(13)
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net		830		323
Energy-Related Contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets		2,228		816
Derivative Contracts, Noncurrent Assets		816		546
Total Mark-to-Market Derivative Assets		3,044		1,362
Derivative Contracts, Current Liabilities		(3,051)		(1,055)
Derivative Contracts, Noncurrent Liabilities		(1,303)		(856)
Total Mark-to-Market Derivative (Liabilities)		(4,354)		(1,911)
Net Mark-to-Market Derivative Assets (Liabilities)		(1,310)		(549)
Energy-Related Contracts [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1]	1,280		839
Energy-Related Contracts [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1]	(2,084)		(744)
Energy-Related Contracts [Member] | Other Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1]	(767)		(518)
Energy-Related Contracts [Member] | Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1],[2],[3]	(2,851)		(1,262)
Energy-Related Contracts [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1]	2,892		1,038
Energy-Related Contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1],[3]	$ 4,172	[4]	$ 1,877	[2]

[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, 2022 and December 31, 2021, PSEG Power had net cash collateral (receipts) payments to counterparties of $1,527 million and $844 million, respectively. Of these net cash collateral (receipts) payments, $1,321 million and $615 million as of March 31, 2022 and December 31, 2021, respectively, were netted against the corresponding net derivative contract positions. Of the $1,321 million as of March 31, 2022, $(22) million was netted against current assets, $(15) million was netted against noncurrent assets, $830 million was netted against current liabilities and $528 million was netted against noncurrent liabilities. Of the $615 million as of December 31, 2021, $(30) million was netted against current assets, $(13) million was netted against noncurrent assets, $323 million was netted against current liabilities and $335 million was netted 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” below 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 13. Financial Risk Management Activities for additional detail.

[4] Private term loan with book value approximating fair value (Level 2 measurement).