Commitments And Contingent Liabilities (Face Value Of Outstanding Guarantees, Current Exposure And Margin Positions) (Detail) - PSEG Power LLC [Member] - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Other Commitments [Line Items]
Face Value of Outstanding Guarantees	$ 1,959	$ 1,792
Exposure under Current Guarantees	176	128
Letters of Credit Margin Posted	80	128
Letters of Credit Margin Received	242	45
Counterparty Cash Margin Deposited	60	0
Counterparty Cash Margin Received	(1)	(5)
Net Broker Balance Deposited (Received)	785	59
Other Letters of Credit	$ 67	$ 42