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Reportable Segments Earnings (loss) from equity investments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Earnings (loss) from equity investments and amortization of excess cost of equity investments, including loss on impairments of equity investments | $ 640 | $ 18 | $ 522
Operating Segments | Natural Gas Pipelines |  |  |
Segment Reporting Information [Line Items] |  |  |
Earnings (loss) from equity investments and amortization of excess cost of equity investments, including loss on impairments of equity investments | 551 | (101) | 410
Operating Segments | Products Pipelines |  |  |
Segment Reporting Information [Line Items] |  |  |
Earnings (loss) from equity investments and amortization of excess cost of equity investments, including loss on impairments of equity investments | 45 | 63 | 56
Operating Segments | Terminals |  |  |
Segment Reporting Information [Line Items] |  |  |
Earnings (loss) from equity investments and amortization of excess cost of equity investments, including loss on impairments of equity investments | 22 | 23 | 22
Operating Segments | CO2 |  |  |
Segment Reporting Information [Line Items] |  |  |
Earnings (loss) from equity investments and amortization of excess cost of equity investments, including loss on impairments of equity investments | $ 22 | $ 33 | $ 34

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