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Goodwill (Tables)
12 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
Goodwill by reportable business segment as of both December 31, 2015 and 2014 are as follows:
 
(in millions)
Natural Gas Distribution
$
746

Energy Services (1)
83

Other
11

Total
$
840



(1)
Amounts presented are net of accumulated goodwill impairment charge of $252 million.