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GOODWILL (Tables)
 12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The following table presents goodwill by reportable segment:
 
As of December 31, 2016 and 2015
(Billions of Dollars)
Electric
Distribution
 
Electric
Transmission
 
Natural Gas
Distribution
 
Total
Goodwill
$
2.5

 
$
0.6

 
$
0.4

 
$
3.5