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Reportable Segments Earnings (loss) from equity investments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Earnings from equity investments and amortization of excess cost of equity investments, including loss on impairments | $ 367 | $ (172) | $ 333
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 | 253 | (269) | 285
Operating Segments | CO2 |  |  |
Segment Reporting Information [Line Items] |  |  |
Earnings from equity investments and amortization of excess cost of equity investments, including loss on impairments | 42 | 22 | (5)
Operating Segments | Terminals |  |  |
Segment Reporting Information [Line Items] |  |  |
Earnings from equity investments and amortization of excess cost of equity investments, including loss on impairments | 24 | 19 | 17
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 | $ 48 | $ 56 | $ 36

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