Commitments And Contingent Liabilities (Basic Generation Service (BGS) And Basic Gas Supply Service (BGSS)) (Detail) cf in Billions	6 Months Ended
	Jun. 30, 2019 USD ($) cf $ / mwd $ / MWh 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 2016 [Member]
Long-term Purchase Commitment [Line Items]
36-Month Terms Ending	May 31, 2019
Load (MW) | MW	2,800
Dollars Per Megawatt Hour | $ / MWh	96.38
Public Service Electric and Gas Company [Member] | Auction Year 2017 [Member]
Long-term Purchase Commitment [Line Items]
36-Month Terms Ending	May 31, 2020
Load (MW) | MW	2,800
Dollars Per Megawatt Hour | $ / MWh	90.78
Public Service Electric and Gas Company [Member] | Auction Year 2018 [Member]
Long-term Purchase Commitment [Line Items]
Dollars Per Megawatt-Day | $ / mwd	287.76
36-Month Terms Ending	May 31, 2021
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]
Dollars Per Megawatt-Day | $ / mwd	281.78
36-Month Terms Ending	May 31, 2022	[1]
Load (MW) | MW	2,800
Dollars Per Megawatt Hour | $ / MWh	98.04

[1] Prices set in the 2019 BGS auction became effective on June 1, 2019 when the 2016 BGS auction agreements expired.