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Commitments And Contingent Liabilities (Basic Generation Service (BGS) And Basic Gas Supply Service (BGSS)) (Detail)
cf in Billions
12 Months Ended
Dec. 31, 2017
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
PSE&G [Member] | Auction Year 2018 [Member]  
Long-term Purchase Commitment [Line Items]  
36-Month Terms Ending May 31, 2021 [1]
Load (MW) | MW 2,900
$ per kWh | $ / mwd 287.76
Dollars Per Megawatt Hour | $ / mwh 91.77
PSE&G [Member] | Auction Year 2015 [Member]  
Long-term Purchase Commitment [Line Items]  
36-Month Terms Ending May 31, 2018
Load (MW) | MW 2,900
Dollars Per Megawatt Hour | $ / mwh 99.54
PSE&G [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
PSE&G [Member] | Auction Year 2017 [Member]  
Long-term Purchase Commitment [Line Items]  
36-Month Terms Ending May 31, 2020
Load (MW) | MW 2,800
$ per kWh | $ / mwd 276.83
Dollars Per Megawatt Hour | $ / mwh 90.78
[1] Prices set in the 2018 BGS auction will become effective on June 1, 2018 when the 2015 BGS auction agreements expire.