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Reportable Segments Investments (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Investments | $ 7,298 | $ 7,027
Operating Segments | Natural Gas Pipelines |  |
Segment Reporting Information [Line Items] |  |
Investments | 6,218 | 6,185
Operating Segments | CO2 |  |
Segment Reporting Information [Line Items] |  |
Investments | 6 | 0
Operating Segments | Terminals |  |
Segment Reporting Information [Line Items] |  |
Investments | 263 | 252
Operating Segments | Products Pipelines |  |
Segment Reporting Information [Line Items] |  |
Investments | 777 | 566
Operating Segments | Kinder Morgan Canada |  |
Segment Reporting Information [Line Items] |  |
Investments | 34 | 20
Corporate, Non-Segment |  |
Segment Reporting Information [Line Items] |  |
Investments | $ 0 | $ 4

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- Definition The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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