Commitments And Contingent Liabilities (Basic Generation Service (BGS) And Basic Gas Supply Service (BGSS)) (Details) (PSE&G [Member])	Sep. 30, 2011 mW cubicFeet
PSE&G [Member]
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%