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Reportable Segments Assets (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Assets at December 31 | $ 79,055 | $ 80,305
Assets held for sale | 0 | 78
Corporate, Non-Segment |  |
Segment Reporting Information [Line Items] |  |
Assets at December 31 | 3,382 | 6,108
Operating Segments | Natural Gas Pipelines |  |
Segment Reporting Information [Line Items] |  |
Assets at December 31 | 51,173 | 50,428
Operating Segments | CO2 |  |
Segment Reporting Information [Line Items] |  |
Assets at December 31 | 3,946 | 4,065
Operating Segments | Terminals |  |
Segment Reporting Information [Line Items] |  |
Assets at December 31 | 9,935 | 9,725
Operating Segments | Products Pipelines |  |
Segment Reporting Information [Line Items] |  |
Assets at December 31 | 8,539 | 8,329
Operating Segments | Kinder Morgan Canada |  |
Segment Reporting Information [Line Items] |  |
Assets at December 31 | $ 2,080 | $ 1,572

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