Financial Risk Management Activities - Schedule of Derivative Instruments Fair Value in Balance Sheets (Parenthetical) (Details) - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Collateral already posted, aggregate fair value		$ 116	$ 113
Derivative, fair value, amount offset against collateral, net	[1]	35	22
Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative, fair value, amount offset against collateral, net		66	15
Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative, fair value, amount offset against collateral, net			(1)
Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative, fair value, amount offset against collateral, net			$ 8
Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Derivative, fair value, amount offset against collateral, net		$ (31)

[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 September 30, 2024 and December 31, 2023, PSEG Power had net cash collateral (receipts) payments to counterparties of $116 million and $113 million, respectively. Of these net cash collateral (receipts) payments, $35 million and $22 million as of September 30, 2024 and December 31, 2023, respectively, were netted against the corresponding net derivative contract positions. Of the $35 million as of September 30, 2024, $(31) million was netted against noncurrent assets and $66 million against current 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.