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Goodwill (Schedule Of Goodwill By Reporting Segment) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Goodwill [Line Items]    
Goodwill $ 8,310 $ 5,858
United States [Member]
   
Goodwill [Line Items]    
Goodwill 2,618 2,618
Canada [Member]
   
Goodwill [Line Items]    
Goodwill 1,997 2,838
EnLink [Member]
   
Goodwill [Line Items]    
Goodwill $ 3,695 $ 402