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Reportable Segments Investments (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Investments | $ 7,481 | $ 7,298
Operating Segments | Natural Gas Pipelines |  |
Segment Reporting Information [Line Items] |  |
Investments | 6,358 | 6,218
Operating Segments | Products Pipelines |  |
Segment Reporting Information [Line Items] |  |
Investments | 839 | 777
Operating Segments | Terminals |  |
Segment Reporting Information [Line Items] |  |
Investments | 268 | 263
Operating Segments | CO2 |  |
Segment Reporting Information [Line Items] |  |
Investments | 16 | 6
Operating Segments | Kinder Morgan Canada |  |
Segment Reporting Information [Line Items] |  |
Investments | $ 0 | $ 34

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