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Reportable Segments Depreciation, depletion and amortization (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
DD&A | $ 2,164 | $ 2,411 | $ 2,297
Operating Segments | Natural Gas Pipelines |  |  |
Segment Reporting Information [Line Items] |  |  |
DD&A | 1,062 | 1,005 | 955
Operating Segments | Products Pipelines |  |  |
Segment Reporting Information [Line Items] |  |  |
DD&A | 347 | 338 | 326
Operating Segments | Terminals |  |  |
Segment Reporting Information [Line Items] |  |  |
DD&A | 438 | 494 | 489
Operating Segments | CO2 |  |  |
Segment Reporting Information [Line Items] |  |  |
DD&A | 291 | 548 | 473
Operating Segments | Kinder Morgan Canada |  |  |
Segment Reporting Information [Line Items] |  |  |
DD&A | 0 | 0 | 29
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
DD&A | $ 26 | $ 26 | $ 25

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