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Reportable Segments Earnings (loss) from equity investments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Earnings from equity investments and amortization of excess cost of equity investments, including loss on impairments | $ 522 | $ 367 | $ (172)
Operating Segments | Natural Gas Pipelines |  |  |
Segment Reporting Information [Line Items] |  |  |
Earnings from equity investments and amortization of excess cost of equity investments, including loss on impairments | 391 | 253 | (269)
Operating Segments | Products Pipelines |  |  |
Segment Reporting Information [Line Items] |  |  |
Earnings from equity investments and amortization of excess cost of equity investments, including loss on impairments | 75 | 48 | 56
Operating Segments | Terminals |  |  |
Segment Reporting Information [Line Items] |  |  |
Earnings from equity investments and amortization of excess cost of equity investments, including loss on impairments | 22 | 24 | 19
Operating Segments | CO2 |  |  |
Segment Reporting Information [Line Items] |  |  |
Earnings from equity investments and amortization of excess cost of equity investments, including loss on impairments | $ 34 | $ 42 | $ 22

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