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Commitments And Contingent Liabilities (Guaranteed Obligations) (Detail) - PSEG Power [Member] - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Loss Contingencies [Line Items]    
Face Value of Outstanding Guarantees $ 1,788 $ 1,792
Exposure under Current Guarantees 113 128
Letters of Credit Margin Posted 112 128
Letters of Credit Margin Received 51 45
Counterparty Cash Collateral Deposited 0 0
Counterparty Cash Collateral Received (4) (5)
Net Broker Balance Deposited (Received) 102 59
Other Letters of Credit $ 42 $ 42