Commitments And Contingent Liabilities (Guaranteed Obligations) (Detail) - PSEG Power [Member] - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Face Value of Outstanding Guarantees	$ 1,914	$ 1,959
Exposure under Current Guarantees	188	176
Letters of Credit Margin Posted	83	80
Letters of Credit Margin Received	21	242
Counterparty Cash Collateral Deposited	32	60
Counterparty Cash Collateral Received	(1)	(1)
Net Broker Balance Deposited (Received)	1,496	785
Other Letters of Credit	$ 82	$ 67