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Commitments And Contingent Liabilities (Basic Generation Service (BGS) And Basic Gas Supply Service (BGSS)) (Detail)
cf in Billions
9 Months Ended
Sep. 30, 2021
USD ($)
cf
$ / MWh
$ / mwd
MW
Long-term Purchase Commitment [Line Items]  
Number of cubic feet in gas hedging permitted to be recovered by BPU | cf 115
Percentage of residential gas supply permitted to be recovered in gas hedging by BPU 80.00%
Number Of Cubic Feet To Be Hedged | cf 70
Percentage of annual residential gas supply requirements to be hedged 50.00%
Public Service Electric and Gas Company [Member]  
Long-term Purchase Commitment [Line Items]  
ZEC Charge per kwh | $ $ 0.004
Public Service Electric and Gas Company [Member] | Auction Year 2018 [Member]  
Long-term Purchase Commitment [Line Items]  
Load (MW) | MW 2,900
Dollars Per Megawatt Hour | $ / MWh 91.77
Public Service Electric and Gas Company [Member] | Auction Year 2019 [Member]  
Long-term Purchase Commitment [Line Items]  
Load (MW) | MW 2,800
Dollars Per Megawatt Hour | $ / MWh 98.04
Public Service Electric and Gas Company [Member] | Auction Year 2020 [Member]  
Long-term Purchase Commitment [Line Items]  
Dollars Per Megawatt-Day | $ / mwd 359.98
Load (MW) | MW 2,800
Dollars Per Megawatt Hour | $ / MWh 102.16
Public Service Electric and Gas Company [Member] | Auction Year 2021  
Long-term Purchase Commitment [Line Items]  
Dollars Per Megawatt-Day | $ / mwd 351.06
Load (MW) | MW 2,900
Dollars Per Megawatt Hour | $ / MWh 64.80