Commitments And Contingent Liabilities (Basic Generation Service (BGS) And Basic Gas Supply Service (BGSS)) (Detail) - Jun. 30, 2015 cf in Billions		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%
PSE And G [Member] | Auction Year 2012 [Member]
Long-term Purchase Commitment [Line Items]
36-Month Terms Ending		May 31, 2015
Load (MW) | MW		2,900
Dollars Per Megawatt Hour		83.88
PSE And G [Member] | Auction Year 2013 [Member]
Long-term Purchase Commitment [Line Items]
36-Month Terms Ending		May 31, 2016
Load (MW) | MW		2,800
Dollars Per Megawatt Hour		92.18
PSE And G [Member] | Auction Year 2014 [Member]
Long-term Purchase Commitment [Line Items]
Dollars Per Megawatt-Day | $ / mwd		282.04
36-Month Terms Ending		May 31, 2017
Load (MW) | MW		2,800
Dollars Per Megawatt Hour		97.39
PSE And G [Member] | Auction Year 2015 [Member]
Long-term Purchase Commitment [Line Items]
Dollars Per Megawatt-Day | $ / mwd		272.78
36-Month Terms Ending	[1]	May 31, 2018
Load (MW) | MW		2,900
Dollars Per Megawatt Hour		99.54

[1] Prices set for the 2015 BGS auction year became effective on June 1, 2015 when the 2012 BGS auction agreements expired.