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Reportable Segments Other expense (income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Other expense (income) | $ (13) | $ (39) | $ 1,617
Operating Segments | Natural Gas Pipelines |  |  |
Segment Reporting Information [Line Items] |  |  |
Other expense (income) | (12) | (13) | 1,597
Operating Segments | Products Pipelines |  |  |
Segment Reporting Information [Line Items] |  |  |
Other expense (income) | 4 | (12) | 0
Operating Segments | Terminals |  |  |
Segment Reporting Information [Line Items] |  |  |
Other expense (income) | (2) | (14) | 32
Operating Segments | CO2 |  |  |
Segment Reporting Information [Line Items] |  |  |
Other expense (income) | 0 | (1) | (8)
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Other expense (income) | $ (3) | $ 1 | $ (4)

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- Definition Amount of other expense (income) that is infrequent in occurrence or unusual in nature. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483613/220-20-50-1 + Details
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