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Reportable Segments Operating expenses (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Operating expenses(b) | $ 7,288 | $ 7,215 | $ 6,222
Operating Segments | Natural Gas Pipelines |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating expenses(b) | 5,353 | 5,457 | 4,393
Operating Segments | Products Pipelines |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating expenses(b) | 594 | 487 | 573
Operating Segments | Terminals |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating expenses(b) | 818 | 788 | 768
Operating Segments | CO2 |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating expenses(b) | 453 | 394 | 399
Operating Segments | Kinder Morgan Canada |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating expenses(b) | 72 | 95 | 87
Corporate, Non-Segment and intersegment eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating expenses(b) | $ (2) | $ (6) | $ 2

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