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LONG-TERM INVESTMENTS - Schedule of Long-Term Investments (Details) $ in Millions, $ in Billions | Aug. 01, 2018 CAD ($) | Dec. 31, 2018 CAD ($) | Jun. 30, 2018 CAD ($) | Dec. 31, 2017 CAD ($) | Apr. 27, 2017 | Feb. 15, 2017 CAD ($) | Feb. 15, 2017 USD ($) | Feb. 08, 2017
--- | --- | --- | --- | --- | --- | --- | --- | ---
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Total long-term investments |  | $ 16,707 |  | $ 16,644 |  |  |  |
Disposal group, held-for-sale, not discontinued operations | Texas Express Ngl System |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
EQUITY INVESTMENTS | $ 447 |  | $ 447 |  |  |  |  |
Enbridge Renewable Infrastructure Investments S.a.r.l. (ERII) | Canada Pension Plan Investment Board (CPPIB) |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Direct common interest (as a percent) | 49.00% |  |  |  |  |  |  |
Noverco | Common shares |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 38.90% |  | 38.90% |  |  |  |
Noverco | Gas Distribution | Common shares |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
EQUITY INVESTMENTS |  | $ 0 |  | $ 0 |  |  |  |
Noverco | Gas Distribution | Preference shares |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
OTHER LONG-TERM INVESTMENTS |  | $ 478 |  | 371 |  |  |  |
Hohe See Offshore Wind Project |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 50.00%
Bakken Pipeline System |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  | 27.60% |  |  |
Bakken Pipeline System | EEP |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  | 27.60% | 27.60% |
Purchase price |  |  |  |  |  | $ 2,000 | $ 1.5 |
Bakken Pipeline System | Liquids Pipelines |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 27.60% |  |  |  |  |  |
EQUITY INVESTMENTS |  | $ 2,039 |  | 1,938 |  |  |  |
Seaway | Liquids Pipelines |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 50.00% |  |  |  |  |  |
EQUITY INVESTMENTS |  | $ 3,113 |  | 2,882 |  |  |  |
Illinois Extension Pipeline Company, L.L.C.2 | Liquids Pipelines |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 65.00% |  |  |  |  |  |
EQUITY INVESTMENTS |  | $ 724 |  | 686 |  |  |  |
Alliance Pipeline | Gas Transmission and Midstream |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 50.00% |  |  |  |  |  |
EQUITY INVESTMENTS |  | $ 368 |  | 375 |  |  |  |
Aux Sable | Gas Transmission and Midstream |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
EQUITY INVESTMENTS |  | $ 311 |  | 300 |  |  |  |
Aux Sable | Gas Transmission and Midstream | Minimum |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 42.70% |  |  |  |  |  |
Aux Sable | Gas Transmission and Midstream | Maximum |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 50.00% |  |  |  |  |  |
DCP Midstream, LLC | Gas Transmission and Midstream |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 50.00% |  |  |  |  |  |
EQUITY INVESTMENTS |  | $ 2,368 |  | 2,143 |  |  |  |
Gulfstream Natural Gas System, L.L.C. | Gas Transmission and Midstream |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 50.00% |  |  |  |  |  |
EQUITY INVESTMENTS |  | $ 1,289 |  | 1,205 |  |  |  |
Nexus Gas Transmission, LLC | Gas Transmission and Midstream |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 50.00% |  |  |  |  |  |
EQUITY INVESTMENTS |  | $ 1,757 |  | 834 |  |  |  |
Offshore - various joint ventures | Gas Transmission and Midstream |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
EQUITY INVESTMENTS |  | $ 400 |  | 389 |  |  |  |
Offshore - various joint ventures | Gas Transmission and Midstream | Minimum |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 22.00% |  |  |  |  |  |
Offshore - various joint ventures | Gas Transmission and Midstream | Maximum |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 74.30% |  |  |  |  |  |
PennEast Pipeline Company, LLC | Gas Transmission and Midstream |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 20.00% |  |  |  |  |  |
EQUITY INVESTMENTS |  | $ 97 |  | 69 |  |  |  |
Sabal Trail Transmission, LLC | Gas Transmission and Midstream |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 50.00% |  |  |  |  |  |
EQUITY INVESTMENTS |  | $ 1,586 |  | 2,355 |  |  |  |
Southeast Supply Header L.L.C. | Gas Transmission and Midstream |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 50.00% |  |  |  |  |  |
EQUITY INVESTMENTS |  | $ 519 |  | 486 |  |  |  |
Steckman Ridge LP | Gas Transmission and Midstream |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 49.50% |  |  |  |  |  |
EQUITY INVESTMENTS |  | $ 237 |  | 221 |  |  |  |
Texas Express Pipeline6 | Gas Transmission and Midstream |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 35.00% |  |  |  |  |  |
EQUITY INVESTMENTS |  | $ 0 |  | 430 |  |  |  |
Vector Pipeline L.P. | Gas Transmission and Midstream |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 60.00% |  |  |  |  |  |
EQUITY INVESTMENTS |  | $ 198 |  | 169 |  |  |  |
Eolien Maritime France SAS | Green Power and Transmission |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 50.00% |  |  |  |  |  |
EQUITY INVESTMENTS |  | $ 68 |  | 69 |  |  |  |
Enbridge Renewable Infrastructure Investments S.a.r.l. (ERII) | Green Power and Transmission |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 25.50% |  |  |  |  |  |
EQUITY INVESTMENTS |  | $ 127 |  | 763 |  |  |  |
Rampion Offshore Wind Project | Green Power and Transmission |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 24.90% |  |  |  |  |  |
EQUITY INVESTMENTS |  | $ 638 |  | 555 |  |  |  |
Emerging Technologies and Other | Green Power and Transmission |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
OTHER LONG-TERM INVESTMENTS |  | 80 |  | 80 |  |  |  |
Other equity investments | Liquids Pipelines |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
EQUITY INVESTMENTS |  | $ 97 |  | 87 |  |  |  |
Other equity investments | Liquids Pipelines | Minimum |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 30.00% |  |  |  |  |  |
Other equity investments | Liquids Pipelines | Maximum |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 43.80% |  |  |  |  |  |
Other equity investments | Gas Transmission and Midstream |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
EQUITY INVESTMENTS |  | $ 6 |  | 34 |  |  |  |
Other equity investments | Gas Transmission and Midstream | Minimum |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 33.30% |  |  |  |  |  |
Other equity investments | Gas Transmission and Midstream | Maximum |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 50.00% |  |  |  |  |  |
Other equity investments | Gas Distribution | Common shares |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 50.00% |  |  |  |  |  |
EQUITY INVESTMENTS |  | $ 15 |  | 15 |  |  |  |
Other equity investments | Green Power and Transmission |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
EQUITY INVESTMENTS |  | $ 72 |  | 95 |  |  |  |
Other equity investments | Green Power and Transmission | Minimum |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 19.00% |  |  |  |  |  |
Other equity investments | Green Power and Transmission | Maximum |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 50.00% |  |  |  |  |  |
Other equity investments | Eliminations and Other |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
EQUITY INVESTMENTS |  | $ 10 |  | 26 |  |  |  |
Other equity investments | Eliminations and Other | Minimum |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 19.00% |  |  |  |  |  |
Other equity investments | Eliminations and Other | Maximum |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 42.70% |  |  |  |  |  |
Other long-term investments | Eliminations and Other |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
OTHER LONG-TERM INVESTMENTS |  | $ 110 |  | $ 67 |  |  |  |

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- Details
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