Commitments And Contingent Liabilities (Basic Generation Service (BGS) And Basic Gas Supply Service (BGSS)) (Detail)	3 Months Ended
	Mar. 31, 2015 MW
Long-term Purchase Commitment [Line Items]
Number of cubic feet in gas hedging permitted to be recovered by BPU	115,000,000,000
Percentage of residential gas supply permitted to be recovered in gas hedging by BPU	80.00%
Number of cubic feet to be hedged	70,000,000,000
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)	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)	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	282.04
36-Month Terms Ending	May 31, 2017
Load (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	272.78
36-Month Terms Ending	May 31, 2018	[1]
Load (MW)	2,900
Dollars Per Megawatt Hour	99.54

[1] Prices set for the 2015 BGS auction year will become effective on June 1, 2015 when the 2012 BGS auction agreements expire.