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Divestitures and Acquisition Sale of Equity Interest in SNG (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Sep. 01, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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 | $ 0 | $ 1,401
Loss on impairments and divestitures, net |  | $ 167 | $ 13 | 387
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 |  |  |
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] |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |
SNG | Bear Creek Storage |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  | 25.00% |  |
SNG | 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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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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