Commitments And Contingent Liabilities (Basic Generation Service (BGS) And Basic Gas Supply Service (BGSS)) (Detail) cf in Billions	Dec. 31, 2020 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%
Percentage of annual residential gas supply requirements to be hedged	50.00%
Number of cubic feet to be hedged | cf	70
Public Service Electric and Gas Company | Auction Year 2017 [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 | Auction Year 2018 [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 | Auction Year 2019 [Member]
Long-term Purchase Commitment [Line Items]
Load (MW) | MW	2,800
$ per kWh | $ / mwd	359.98
Dollars Per Megawatt Hour | $ / MWh	102.16
Public Service Electric and Gas Company | Auction Year 2020 [Member]
Long-term Purchase Commitment [Line Items]
Load (MW) | MW	2,900
$ per kWh | $ / mwd	351.06
Dollars Per Megawatt Hour | $ / MWh	64.80