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Impairments (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) Terminals | Sep. 01, 2016
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Impairment of long-lived assets and equity investments | $ 437.0 | $ 172.0 | $ 1,013.0 |
(Gain) Loss on Sale of Assets and Asset Impairment Charges | 167.0 | 13.0 | 387.0 |
Loss (Gain) on impairments and divestitures of equity investments, net | 270.0 | 150.0 | 610.0 |
Gain (Loss) on Disposition of Assets |  | 0.0 | 0.0 |
Revenues | 14,144.0 | 13,705.0 | 13,058.0 |
Trans Mountain,Trans Mountain Expansion Project and Other Related Assets [Member] |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Gain (Loss) on Disposition of Assets | (595.0) |  |  |
Sale Equity Interest in SNG [Member] |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
(Gain) Loss on Sale of Assets and Asset Impairment Charges |  |  | 84.0 |
Disposal Group, Equity Interest Sold |  |  |  | 50.00%
Natural Gas Pipelines |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Loss on impairment of long-lived assets | 600.0 | 30.0 | 106.0 |
(Gain) Loss on Sale of Assets and Asset Impairment Charges | (6.0) | 0.0 | 94.0 |
Loss (Gain) on impairments and divestitures of equity investments, net | 270.0 | 150.0 | 606.0 |
Revenues | 9,015.0 |  |  |
Natural Gas Pipelines | Investee [Member] |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Impairment at equity investee, other than temporary | 0.0 | 10.0 | 7.0 |
Natural Gas Pipelines | Sale Equity Interest in SNG [Member] |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Disposal Group, Equity Interest Sold |  |  |  | 50.00%
Products Pipelines |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Loss on impairment of long-lived assets | 36.0 | 0.0 | 66.0 |
(Gain) Loss on Sale of Assets and Asset Impairment Charges | 0.0 | 0.0 | 10.0 |
Loss (Gain) on impairments and divestitures of equity investments, net | 0.0 | 0.0 | (12.0) |
Revenues | 1,713.0 |  |  |
Terminals |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Loss on impairment of long-lived assets | 59.0 | 3.0 | 19.0 |
(Gain) Loss on Sale of Assets and Asset Impairment Charges | (6.0) | (18.0) | 80.0 |
Loss (Gain) on impairments and divestitures of equity investments, net | 0.0 | 0.0 | $ 16.0 |
Number of terminals | Terminals |  |  | 20 |
Revenues | 2,019.0 |  |  |
Terminals | Deeprock Development [Member] |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
(Gain) Loss on Sale of Assets and Asset Impairment Charges |  | $ (23.0) |  |
Disposal Group, Equity Interest Sold |  | 40.00% |  |
CO2 |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Loss on impairment of long-lived assets | 79.0 | $ (1.0) | $ 20.0 |
(Gain) Loss on Sale of Assets and Asset Impairment Charges | 0.0 | 0.0 | (1.0) |
Revenues | 1,255.0 |  |  |
CO2 | Investee [Member] |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Impairment at equity investee, other than temporary | 0.0 | (4.0) | 9.0 |
Other |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
(Gain) Loss on Sale of Assets and Asset Impairment Charges | 0.0 | 2.0 | (7.0) |
Operating Segments |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
(Gain) Loss on Sale of Assets and Asset Impairment Charges | 437.0 | 172.0 | 1,013.0 |
Operating Segments | Products Pipelines |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Revenues | 1,699.0 | 1,645.0 | 1,631.0 |
Cost of Sales [Member] | Natural Gas Pipelines | Colden storage [Member] |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Loss on impairment of long-lived assets |  | 3.0 |  |
MEP |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Equity Method Investments | 235.0 | 253.0 |  |
MEP | Natural Gas Pipelines |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Loss (Gain) on impairments and divestitures of equity investments, net |  |  | 350.0 |
Ruby |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Equity Method Investments | 750.0 | $ 774.0 |  |
Ruby | Natural Gas Pipelines |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Loss (Gain) on impairments and divestitures of equity investments, net |  |  | $ 250.0 |
Pacific Gas and Electric (PG&E) [Member] | Ruby |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Revenues | 93.0 |  |  |
Ruby |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |
Notes receivable from affiliates | $ 55.0 |  |  |

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