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Acquisitions Subsequent Event - Sale of Equity Interest in SNG (Details) - USD ($)
$ in Millions
 6 Months Ended
Jul. 10, 2016
Jun. 30, 2016
Jun. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from sale or casualty of property, plant and equipment, investments and other net assets, net of removal of costs   $ 220 $ 4
Anticipated Sale of 50% of Southern Natural Gas Company LLC [Member] | Subsequent Event [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Disposal Group, Equity Interest Sold 50.00%    
Proceeds from sale or casualty of property, plant and equipment, investments and other net assets, net of removal of costs $ 1,470    
Disposal Group, Equity Method Investment Retained after Disposal, Ownership Interest after Disposal 50.00%    
Total Enterprise Value $ 4,150