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GOODWILL (Tables)
12 Months Ended
Dec. 31, 2015
Notes To Consolidated Financial Statements [Abstract]  
Schedule Of Goodwill Text Block
   As of December 31, 2015 and 2014
   Electric Electric Natural Gas   
(Billions of Dollars) Distribution Transmission Distribution Total
Goodwill $2.5 $0.6 $0.4 $3.5