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General Basis of Presentation (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Number of Operating Segments |  |  |  | 7 |
Loss on impairments and disposals of long-lived assets and equity investments, net |  |  | $ 50 | $ 257 | $ 130
Equity Method Investment, Realized Gain (Loss) on Disposal | $ 12 |  |  | 12 |
Natural Gas Pipelines |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Loss on impairments and disposals of long-lived assets and equity investments, net |  |  | 48 | 106 | 99
Natural Gas Pipelines | Fort Union Gas Gathering L.L.C. and Bighorn Gas Gathering L.L.C. [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Loss on impairments of equity investments |  |  |  | 13 | 26
CO2 |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Loss on impairments and disposals of long-lived assets and equity investments, net |  |  | 9 | 33 | 9
Terminals |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Loss on impairments and disposals of long-lived assets and equity investments, net |  |  |  | 20 |
Products Pipelines |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Loss on impairments and disposals of long-lived assets and equity investments, net |  |  |  | 64 |
Products Pipelines | Discontinued Operations, Held-for-sale [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Loss on impairments and disposals of long-lived assets and equity investments, net |  |  |  | 8 |
Other Assets |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Loss on impairments and disposals of long-lived assets and equity investments, net |  |  | $ 7 | $ 13 | $ 4
Natural Gas Pipelines |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill, Impairment Loss |  | $ 1,150 |  |  |

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