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Reportable Segments Earnings (loss) from equity investments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Earnings from equity investments and amortization of excess cost of equity investments | $ 772 | $ 728 | $ 513
Operating Segments | Natural Gas Pipelines |  |  |
Segment Reporting Information [Line Items] |  |  |
Earnings from equity investments and amortization of excess cost of equity investments | 746 | 650 | 435
Operating Segments | Products Pipelines |  |  |
Segment Reporting Information [Line Items] |  |  |
Earnings from equity investments and amortization of excess cost of equity investments | (6) | 33 | 34
Operating Segments | Terminals |  |  |
Segment Reporting Information [Line Items] |  |  |
Earnings from equity investments and amortization of excess cost of equity investments | 9 | 14 | 15
Operating Segments | CO2 |  |  |
Segment Reporting Information [Line Items] |  |  |
Earnings from equity investments and amortization of excess cost of equity investments | $ 23 | $ 31 | $ 29

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