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