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Asset Impairments (Tables)
 9 Months Ended
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill by Segment
The following table presents the changes in the carrying value of goodwill for the nine months ended September 30, 2016:
Goodwill
 
Regulated Distribution
 
Regulated Transmission
 
Competitive Energy Services
 
Consolidated
 
 
(In millions)
Balance as of December 31, 2015
 
$
5,092

 
$
526

 
$
800

 
$
6,418

Impairment
 
—

 
—

 
(800
)
 
(800
)
Balance as of September 30, 2016
 
$
5,092

 
$
526

 
$
—

 
$
5,618