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Financial Risk Management Activities - Schedule of Derivative Instruments Fair Value in Balance Sheets (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Derivatives, Fair Value [Line Items]    
Derivative Contracts, Current Assets $ 33 $ 112
Derivative Contracts, Noncurrent Assets 51 29
Total Mark-to-Market Derivative Assets 84 141
Derivative Contracts, Current Liabilities (5) (86)
Derivative Contracts, Noncurrent Liabilities (4) (6)
Total Mark-to-Market Derivative (Liabilities) (9) (92)
Net Mark-to-Market Derivative Assets (Liabilities) 75 49
Derivative, Fair Value, Amount Offset Against Collateral, Net [1] 121 22
PSEG Power    
Derivatives, Fair Value [Line Items]    
Derivative Contracts, Current Assets 33 106
Derivative Contracts, Noncurrent Assets 19 29
Total Mark-to-Market Derivative Assets 52 135
Derivative Contracts, Current Liabilities (5) (70)
Derivative Contracts, Noncurrent Liabilities (4) (5)
Total Mark-to-Market Derivative (Liabilities) (9) (75)
Net Mark-to-Market Derivative Assets (Liabilities) 43 60
Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative, Fair Value, Amount Offset Against Collateral, Net 48 8
Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative, Fair Value, Amount Offset Against Collateral, Net   (1)
Other Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative, Fair Value, Amount Offset Against Collateral, Net 73 15
Energy-Related Contracts | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative Contracts, Current Assets 403 912
Derivative Contracts, Noncurrent Assets 375 440
Total Mark-to-Market Derivative Assets 778 1,352
Derivative Contracts, Current Liabilities (448) (890)
Derivative Contracts, Noncurrent Liabilities (408) (424)
Total Mark-to-Market Derivative (Liabilities) (856) (1,314)
Net Mark-to-Market Derivative Assets (Liabilities) (78) 38
Energy-Related Contracts | Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative, Fair Value, Amount Offset Against Collateral, Net [1] 404 419
Energy-Related Contracts | Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative, Fair Value, Amount Offset Against Collateral, Net [1] (370) (806)
Energy-Related Contracts | Other Noncurrent Assets    
Derivatives, Fair Value [Line Items]    
Derivative, Fair Value, Amount Offset Against Collateral, Net [1] (356) (411)
Energy-Related Contracts | Assets    
Derivatives, Fair Value [Line Items]    
Derivative, Fair Value, Amount Offset Against Collateral, Net [1],[2],[3] (726) (1,217)
Energy-Related Contracts | Other Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative, Fair Value, Amount Offset Against Collateral, Net [1] 443 820
Energy-Related Contracts | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative, Fair Value, Amount Offset Against Collateral, Net [1],[2],[3] 847 1,239
Interest Rate Swap | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative Contracts, Current Assets 0 6
Derivative Contracts, Noncurrent Assets 32 0
Total Mark-to-Market Derivative Assets 32 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) $ 32 (11)
Interest Rate Swap | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative, Fair Value, Amount Offset Against Collateral, Net [3]   $ 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 Consolidated Balance Sheets. As of December 31, 2024 and 2023, PSEG Power had net cash collateral payments to counterparties of $244 million and $113 million, respectively. Of these net cash collateral (receipts) payments, $121 million as of December 31, 2024 and $22 million as of December 31, 2023 were netted against the corresponding net derivative contract positions. Of the $121 million as of December 31, 2024, $73 million was netted against current liabilities and $48 million was netted 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 an exchange, 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 16. Financial Risk Management Activities for additional detail.