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Goodwill Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Sep. 01, 2016
Goodwill [Line Items] |  |  |
Goodwill, Written off Related to Sale of Business Unit | $ 3 | $ 1,644 |
Natural Gas Pipelines Regulated |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Written off Related to Sale of Business Unit | 0 | 1,635 |
Terminals |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Written off Related to Sale of Business Unit | 3 | 9 |
Products Pipelines Terminals |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Written off Related to Sale of Business Unit | 0 | 0 |
CO2 |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Written off Related to Sale of Business Unit | $ 0 | 0 |
Sale Equity Interest in SNG [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Written off Related to Sale of Business Unit |  | $ 1,635 |
Disposal Group, Equity Interest Sold |  |  | 50.00%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Details
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- Details
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