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Recent Accounting Standards New Standards Adopted (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Jan. 01, 2020
Public Service Electric and Gas Company      
New Accounting Pronouncement, Early Adoption [Line Items]      
Accounts Receivable and Unbilled Revenues, Allowance for Credit Losses   $ 206  
Regulatory Assets $ 4,028 $ 4,241  
Public Service Electric and Gas Company | Cumulative Effect, Period of Adoption, Adjustment      
New Accounting Pronouncement, Early Adoption [Line Items]      
Accounts Receivable and Unbilled Revenues, Allowance for Credit Losses     $ 8
Regulatory Assets     6
Retained Earnings, Unappropriated     $ 2
PSEG Power LLC      
New Accounting Pronouncement, Early Adoption [Line Items]      
Goodwill, Impairment Loss $ 16