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LONG-TERM INVESTMENTS - Schedule of Long-Term Investments (Details) - CAD ($) $ in Millions | Dec. 31, 2021 | Oct. 31, 2021 | Jun. 06, 2021 | Mar. 18, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | ---
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) |  |  |  | 25.50% |
Total long-term investments | $ 13,324 |  |  |  | $ 13,818
Noverco Preferred Shares |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) |  |  | 38.90% |  |
Noverco Preferred Shares | Preferred Shares | Gas Distribution and Storage |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
OTHER LONG-TERM INVESTMENTS | $ 0 |  |  |  | 567
MarEn Bakken Company LLC1 | Liquids Pipelines |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 75.00% |  |  |  |
EQUITY INVESTMENTS | $ 1,728 |  |  |  | 1,795
MarEn Bakken Company LLC1 | Bakken Pipeline Investments, LLC |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 49.00% |  |  |  |
MarEn Bakken Company LLC1 | Bakken Pipeline System |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 27.60% |  |  |  |
Gray Oak Holdings LLC |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 65.00% |  |  |  |
Gray Oak Holdings LLC | Liquids Pipelines |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 35.00% |  |  |  |
EQUITY INVESTMENTS | $ 469 |  |  |  | 502
Gray Oak Holdings LLC | Gray Oak Holdings LLC |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 22.80% |  |  |  |
Seaway Crude Holdings LLC | Liquids Pipelines |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 50.00% |  |  |  |
EQUITY INVESTMENTS | $ 2,634 |  |  |  | 2,668
Illinois Extension Pipeline Company, LLC | Liquids Pipelines |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 65.00% |  |  |  |
EQUITY INVESTMENTS | $ 593 |  |  |  | 623
Cactus II Pipeline, LLC | Liquids Pipelines |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 20.00% | 20.00% |  |  |
EQUITY INVESTMENTS | $ 434 |  |  |  | 0
Other | Gas Transmission and Midstream |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 33.30% |  |  |  |
EQUITY INVESTMENTS | $ 2 |  |  |  | 4
Other | Liquids Pipelines |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
EQUITY INVESTMENTS | 71 |  |  |  | 73
Other | Renewable Power Generation |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
EQUITY INVESTMENTS | 93 |  |  |  | 74
Other | Eliminations and Other |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
EQUITY INVESTMENTS | $ 23 |  |  |  | 32
Other | Minimum | Liquids Pipelines |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 30.00% |  |  |  |
Other | Minimum | Renewable Power Generation |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 12.00% |  |  |  |
Other | Minimum | Eliminations and Other |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 42.70% |  |  |  |
Other | Maximum | Liquids Pipelines |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 43.80% |  |  |  |
Other | Maximum | Renewable Power Generation |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 50.00% |  |  |  |
Other | Maximum | Eliminations and Other |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 50.00% |  |  |  |
Other | Common Shares | Gas Distribution and Storage |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
EQUITY INVESTMENTS | $ 20 |  |  |  | 13
Other | Common Shares | Minimum | Gas Distribution and Storage |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 47.60% |  |  |  |
Other | Common Shares | Maximum | Gas Distribution and Storage |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 50.00% |  |  |  |
Alliance Pipeline | Gas Transmission and Midstream |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 50.00% |  |  |  |
EQUITY INVESTMENTS | $ 504 |  |  |  | 269
Aux Sable | Gas Transmission and Midstream |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
EQUITY INVESTMENTS | $ 238 |  |  |  | 251
Aux Sable | Minimum | Gas Transmission and Midstream |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 42.70% |  |  |  |
Aux Sable | Maximum | Gas Transmission and Midstream |  |  |  |  |
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 | $ 397 |  |  |  | 331
DCP Midstream, LLC | DCP Midstream, LP |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 56.50% |  |  |  |
Gulfstream Natural Gas System, L.L.C. | Gas Transmission and Midstream |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 50.00% |  |  |  |
EQUITY INVESTMENTS | $ 1,180 |  |  |  | 1,175
Nexus Gas Transmission, LLC | Gas Transmission and Midstream |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 50.00% |  |  |  |
EQUITY INVESTMENTS | $ 1,724 |  |  |  | 1,745
PennEast Pipeline Company, LLC | Gas Transmission and Midstream |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 20.00% |  |  |  |
EQUITY INVESTMENTS | $ 12 |  |  |  | 116
Sabal Trail Transmission, LLC | Gas Transmission and Midstream |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 50.00% |  |  |  |
EQUITY INVESTMENTS | $ 1,464 |  |  |  | 1,510
Southeast Supply Header, LLC | Gas Transmission and Midstream |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 50.00% |  |  |  |
EQUITY INVESTMENTS | $ 82 |  |  |  | 84
Steckman Ridge, LP | Gas Transmission and Midstream |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 50.00% |  |  |  |
EQUITY INVESTMENTS | $ 88 |  |  |  | 90
Vector Pipeline Limited | Gas Transmission and Midstream |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 60.00% |  |  |  |
EQUITY INVESTMENTS | $ 189 |  |  |  | 201
Offshore - various joint ventures | Gas Transmission and Midstream |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
EQUITY INVESTMENTS | $ 309 |  |  |  | $ 338
Offshore - various joint ventures | Minimum | Gas Transmission and Midstream |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 22.00% |  |  |  |
Offshore - various joint ventures | Maximum | Gas Transmission and Midstream |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 74.30% |  |  |  |
Noverco Preferred Shares | Common Shares | Gas Distribution and Storage |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 38.90% |  |  |  | 38.90%
EQUITY INVESTMENTS | $ 0 |  |  |  | $ 156
EIH S.a.r.l. |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) |  |  |  | 49.00% |
EIH S.a.r.l. | Renewable Power Generation |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 51.00% |  |  |  |
EQUITY INVESTMENTS | $ 38 |  |  |  | 96
Enbridge Renewable Infrastructure Investments S.a.r.l. (ERII) | Renewable Power Generation |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 51.00% |  |  |  |
EQUITY INVESTMENTS | $ 54 |  |  |  | 100
Rampion Offshore Wind Limited | Renewable Power Generation |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 24.90% |  |  |  |
EQUITY INVESTMENTS | $ 450 |  |  |  | 599
NextBridge Infrastructure LP | Renewable Power Generation |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 25.00% |  |  |  |
EQUITY INVESTMENTS | $ 186 |  |  |  | 122
Emerging Technologies and Other | Renewable Power Generation |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
OTHER LONG-TERM INVESTMENTS | 32 |  |  |  | 32
Other long-term investments | Eliminations and Other |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
OTHER LONG-TERM INVESTMENTS | $ 310 |  |  |  | $ 252
Bakken Pipeline Investments, LLC | Bakken Pipeline System |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) | 75.00% |  |  |  |
Éolien Maritime France SAS |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) |  |  |  | 50.00% |
Saint-Nazaire |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) |  |  |  | 25.50% |
Fécamp |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) |  |  |  | 17.90% |
Calvados |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |
Ownership Interest (as a percent) |  |  |  | 21.70% |

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