Commitments and Contingent Liabilities - Schedule of Outstanding Guarantees, Current Exposure and Margin Positions (Details) - PSEG Power - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Loss Contingencies [Line Items]
Face Value of Outstanding Guarantees	$ 1,340	$ 1,381
Exposure under Current Guarantees	40	118
Letters of Credit - Counterparty Margining Posted	4	10
Letters of Credit - Counterparty Margining Received	60	91
Counterparty Cash Collateral Deposited	0	0
Counterparty Cash Collateral Received	(1)	(2)
Net Broker Balance Deposited (Received)	117	115
Other Letters of Credit	$ 155	$ 180