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Reportable Segments Assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Assets | $ 74,157.0 | $ 78,866.0 |
Goodwill | 21,451.0 | 21,965.0 | $ 22,162.0
Natural Gas Pipelines |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets | 50,310.0 | 50,261.0 |
Products Pipelines |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets | 9,468.0 | 9,598.0 |
Terminals |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets | 8,890.0 | 9,415.0 |
CO2 |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets | 3,523.0 | 3,928.0 |
Corporate, Non-Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets | $ 1,966.0 | 5,664.0 |
Previously Reported [Member] | Natural Gas Pipelines |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets |  | 51,562.0 |
Previously Reported [Member] | Products Pipelines |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets |  | 8,429.0 |
Previously Reported [Member] | Terminals |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets |  | 9,283.0 |
Restatement Adjustment [Member] | Natural Gas Pipelines |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill |  | (450.0) |
Restatement Adjustment [Member] | Products Pipelines |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill |  | $ 450.0 |

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