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Acquisitions and Divestitures Sale of Equity Interest in SNG (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Sep. 01, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from sale of equity interests in subsidiaries, net |  | $ 0 | $ 1,401 | $ 0
Bear Creek Storage |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  | 75.00% |  |
Sale Equity Interest in SNG [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 of equity interests in subsidiaries, net | $ 1,400 |  |  |
Gain (loss) on impairments and divestitures, net |  |  | $ (84) |
Sale Equity Interest in SNG [Member] | Southern Natural Gas Company LLC |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Disposal Group, Equity Interest Sold | 50.00% |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |
Sale Equity Interest in SNG [Member] | Bear Creek Storage |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |

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