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Goodwill (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Goodwill [Line Items]    
Goodwill $ 840 $ 840
Natural Gas Distribution [Member]    
Goodwill [Line Items]    
Goodwill 746 746
Energy Services [Member]    
Goodwill [Line Items]    
Goodwill 83 83
Corporate and Other [Member]    
Goodwill [Line Items]    
Goodwill $ 11 $ 11