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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 |  |

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