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Reportable Segments Depreciation, depletion and amortization (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
DD&A | $ 2,297 | $ 2,261 | $ 2,209
Operating Segments | Natural Gas Pipelines |  |  |
Segment Reporting Information [Line Items] |  |  |
DD&A | 1,058 | 1,011 | 1,041
Operating Segments | Products Pipelines |  |  |
Segment Reporting Information [Line Items] |  |  |
DD&A | 228 | 216 | 221
Operating Segments | Terminals |  |  |
Segment Reporting Information [Line Items] |  |  |
DD&A | 484 | 472 | 435
Operating Segments | CO2 |  |  |
Segment Reporting Information [Line Items] |  |  |
DD&A | 473 | 493 | 446
Operating Segments | Kinder Morgan Canada |  |  |
Segment Reporting Information [Line Items] |  |  |
DD&A | 29 | 46 | 44
Corporate, Non-Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
DD&A | $ 25 | $ 23 | $ 22

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