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Impairments (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) Terminals | Dec. 31, 2015 USD ($) | Sep. 01, 2016
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Loss (gain) on Sale of Assets and Asset Impairment Charges | $ 172 | $ 1,013 | $ 2,125 |
Loss on impairment of goodwill | 0 | 0 | 1,150 |
Loss (Gain) on impairments and divestitures of equity investments, net | 150 | 610 | 30 |
MEP |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Loss (Gain) on impairments and divestitures of equity investments, net |  | 350 |  |
Ruby |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Loss (Gain) on impairments and divestitures of equity investments, net |  | 250 |  |
Sale Equity Interest in SNG [Member] |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Disposal Group, Equity Interest Sold |  |  |  | 50.00%
Regulated |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Impairment of long-lived assets |  |  | 32 |
Natural Gas Pipelines |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Loss (gain) on Sale of Assets and Asset Impairment Charges | 0 | 94 | 43 |
Loss on impairment of goodwill | 0 | 0 | 1,150 |
Impairment of long-lived assets | 30 | 106 | 79 |
Loss (Gain) on impairments and divestitures of equity investments, net | 150 | 606 | 26 |
Natural Gas Pipelines | Investee [Member] |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Loss (Gain) on impairments and divestitures of equity investments, net | 10 | 7 | 0 |
Nonregulated |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Impairment of long-lived assets |  |  | 47 |
CO2 |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Loss (gain) on Sale of Assets and Asset Impairment Charges | 0 | (1) | 0 |
Impairment of long-lived assets | (1) | 20 | 606 |
CO2 | Investee [Member] |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Loss (Gain) on impairments and divestitures of equity investments, net | (4) | 9 | 26 |
CO2 | Oil and Gas Properties [Member] |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Impairment of long-lived assets |  |  | 399 |
CO2 | Source and transportation projects [Member] |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Impairment of long-lived assets |  |  | 207 |
Terminals |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Loss (gain) on Sale of Assets and Asset Impairment Charges | (18) | 80 | 3 |
Impairment of long-lived assets | 3 | 19 | 188 |
Loss (Gain) on impairments and divestitures of equity investments, net | 0 | $ 16 | 4 |
Number of terminals | Terminals |  | 20 |  |
Terminals | Coal |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Impairment of long-lived assets |  |  | 175 |
Terminals | Deeprock Development [Member] |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Loss (gain) on Sale of Assets and Asset Impairment Charges | $ 23 |  |  |
Disposal Group, Equity Interest Sold | 40.00% |  |  |
Products Pipelines |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Loss (gain) on Sale of Assets and Asset Impairment Charges | $ 0 | $ 10 | 1 |
Impairment of long-lived assets | 0 | 66 | 0 |
Loss (Gain) on impairments and divestitures of equity investments, net | 0 | (12) | 0 |
Other |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Loss (gain) on Sale of Assets and Asset Impairment Charges | 2 | (7) | (1) |
Operating Segments |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Loss (gain) on Sale of Assets and Asset Impairment Charges | 172 | $ 1,013 | 2,125 |
Natural Gas Pipelines-Nonregulated |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Loss on impairment of goodwill |  |  | $ 1,150 |
Cost of Sales [Member] | Colden storage [Member] |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Impairment of long-lived assets | $ 3 |  |  |

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