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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
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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.

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