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Goodwill (Narrative) (Details) (USD $)
9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Goodwill [Line Items]    
Goodwill $ 8,310,000,000 $ 5,858,000,000
EnLink [Member]
   
Goodwill [Line Items]    
Goodwill 3,695,000,000 402,000,000
Increase in goodwill due to contribution to EnLink $ 3,300,000,000