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Reportable Segments Assets (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Assets | $ 71,973 | $ 74,157
Operating Segments | Natural Gas Pipelines |  |
Segment Reporting Information [Line Items] |  |
Assets | 48,597 | 50,310
Operating Segments | Products Pipelines |  |
Segment Reporting Information [Line Items] |  |
Assets | 9,182 | 9,468
Operating Segments | Terminals |  |
Segment Reporting Information [Line Items] |  |
Assets | 8,639 | 8,890
Operating Segments | CO2 |  |
Segment Reporting Information [Line Items] |  |
Assets | 2,478 | 3,523
Other |  |
Segment Reporting Information [Line Items] |  |
Assets | $ 3,077 | $ 1,966

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