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Derivative Instruments And Hedging Activities (Tables)
9 Months Ended
Sep. 30, 2011
Derivative Instruments And Hedging Activities [Abstract] 
Energy Price Hedging Fair Values
     Con Edison     CECONY  
(Millions of Dollars)   2011     2010     2011     2010  

Fair value of net derivative assets/(liabilities) – gross

  $ (115   $ (261   $ (62   $ (156

Impact of netting of cash collateral

    73        176        41        104   

Fair value of net derivative assets/(liabilities) – net

  $ (42   $ (85   $ (21   $ (52
Fair Values Of The Companies' Commodity Derivatives
Changes In The Fair Values Of Commodity Derivatives
Number Of Derivative Contracts By Commodity Type
Aggregate Fair Value Of All Derivative Instruments With Credit Risk Related Contingent Features