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Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | May 31, 2023 | Dec. 31, 2021 | Aug. 20, 2021
Goodwill [Line Items] |  |  |  |  |
Gross goodwill | $ 26,907 |  |  | $ 26,700 |
Accumulated impairment losses | (6,786) |  |  | (6,786) |
Goodwill | 20,121 | $ 19,965 |  | 19,914 |
Acquisitions | 156 | 51 |  |  |
Kinetrex Energy |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  |  |  |  | $ 53
Natural Gas Pipelines Regulated |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Gross goodwill | 15,892 |  |  | 15,892 |
Accumulated impairment losses | (1,643) |  |  | (1,643) |
Goodwill | 14,249 | 14,249 |  | 14,249 |
Acquisitions | 0 | 0 |  |  |
Natural Gas Pipelines Non-Regulated |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Gross goodwill | 5,096 |  |  | 4,940 |
Accumulated impairment losses | (2,597) |  |  | (2,597) |
Goodwill | 2,499 | 2,343 |  | 2,343 |
Acquisitions | 156 | 0 |  |  |
CO2 |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Gross goodwill | 1,528 |  |  | 1,528 |
Accumulated impairment losses | (600) |  |  | (600) |
Goodwill | 928 | 928 |  | 928 |
Acquisitions | 0 | 0 |  |  |
Products Pipelines |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Gross goodwill | 2,575 |  |  | 2,575 |
Accumulated impairment losses | (1,197) |  |  | (1,197) |
Goodwill | 1,378 | 1,378 |  | 1,378 |
Acquisitions | 0 | 0 |  |  |
Products Pipelines Terminals |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Gross goodwill | 221 |  |  | 221 |
Accumulated impairment losses | (70) |  |  | (70) |
Goodwill | 151 | 151 |  | 151 |
Acquisitions | 0 | 0 |  |  |
Terminals |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Gross goodwill | 1,481 |  |  | 1,481 |
Accumulated impairment losses | (679) |  |  | (679) |
Goodwill | 802 | 802 |  | 802 |
Acquisitions | 0 | 0 |  |  |
Terminals | Maximum |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Fair value in excess of their respective carrying values (percentage) |  |  | 10.00% |  |
Energy Transition Ventures |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Gross goodwill | 114 |  |  | 63 |
Accumulated impairment losses | 0 |  |  | 0 |
Goodwill | 114 | 114 |  | $ 63 |
Acquisitions | $ 0 | 51 |  |  |
Energy Transition Ventures | Kinetrex Energy |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill purchase price adjustment |  | $ (10) |  |  |

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