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LONG-TERM INVESTMENTS - Schedule of Long-Term Investments (Details) $ in Millions | Dec. 31, 2022 CAD ($) project | Nov. 30, 2022 | Aug. 17, 2022 | Aug. 16, 2022 | Dec. 31, 2021 CAD ($) | Oct. 12, 2021 | Mar. 18, 2021 project
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LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Total long-term investments | $ 15,936 |  |  |  | $ 13,324 |  |
DCP Midstream, LLC |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 90.00% |  |  | 50.00% |  |  |
DCP Midstream, LP |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 13.20% |  |  |  | 28.30% |  |
Woodfibre LNG Limited Partnership |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) |  | 30.00% |  |  |  |  |
EIH S.a.r.l. |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Number of offshore wind projects | project | 3 |  |  |  |  |  |
Gray Oak Pipeline, LLC |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 65.00% |  |  |  | 65.00% |  |
Éolien Maritime France SAS |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Number of offshore wind projects | project |  |  |  |  |  |  | 3
EMF |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  | 25.50%
Gray Oak Holdings LLC |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  | 58.50% | 22.80% | 35.00% |  |
MaRen Bakken Company LLC | MaRen Bakken Company LLC | Liquids Pipelines |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 75.00% |  |  |  |  |  |
EQUITY INVESTMENTS | $ 1,968 |  |  |  | $ 1,752 |  |
MaRen Bakken Company LLC | Bakken Pipeline Investments, LLC |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 49.00% |  |  |  |  |  |
MaRen Bakken Company LLC | Bakken Pipeline System |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 27.60% |  |  |  |  |  |
DCP Midstream, LLC | DCP Midstream, LLC |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 23.40% |  |  |  |  |  |
DCP Midstream, LLC | DCP Midstream, LLC | Liquids Pipelines |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 90.00% |  |  |  |  |  |
EQUITY INVESTMENTS | $ 1,394 |  |  |  | 469 |  |
DCP Midstream, LLC | DCP Midstream, LLC | Gas Transmission and Midstream |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 23.40% |  |  |  |  |  |
EQUITY INVESTMENTS | $ 317 |  |  |  | 397 |  |
DCP Midstream, LLC | DCP Midstream, LP |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 56.50% |  |  |  |  |  |
Seaway | Seaway | Liquids Pipelines |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 50.00% |  |  |  |  |  |
EQUITY INVESTMENTS | $ 2,744 |  |  |  | 2,634 |  |
Illinois Extension Pipeline Company, LLC | Illinois Extension Pipeline Company, LLC | Liquids Pipelines |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 65.00% |  |  |  |  |  |
EQUITY INVESTMENTS | $ 622 |  |  |  | 593 |  |
Cactus II Pipeline, LLC | Cactus II Pipeline, LLC | Liquids Pipelines |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 30.00% |  |  |  |  | 20.00% |
EQUITY INVESTMENTS | $ 658 |  |  |  | 434 |  |
Other | Other | Liquids Pipelines |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
EQUITY INVESTMENTS | 76 |  |  |  | 71 |  |
Other | Other | Gas Transmission and Midstream |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
EQUITY INVESTMENTS | 0 |  |  |  | 14 |  |
Other | Other | Gas Distribution and Storage |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
EQUITY INVESTMENTS | 20 |  |  |  | 20 |  |
Other | Other | Renewable Power Generation |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
EQUITY INVESTMENTS | $ 107 |  |  |  | 92 |  |
Other | Other | Minimum | Liquids Pipelines |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 30.00% |  |  |  |  |  |
Other | Other | Minimum | Gas Transmission and Midstream |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 20.00% |  |  |  |  |  |
Other | Other | Minimum | Gas Distribution and Storage |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 47.60% |  |  |  |  |  |
Other | Other | Minimum | Renewable Power Generation |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 12.00% |  |  |  |  |  |
Other | Other | Minimum | Eliminations and Other |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 42.70% |  |  |  |  |  |
Other | Other | Maximum | Liquids Pipelines |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 43.80% |  |  |  |  |  |
Other | Other | Maximum | Gas Transmission and Midstream |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 33.30% |  |  |  |  |  |
Other | Other | Maximum | Gas Distribution and Storage |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 50.00% |  |  |  |  |  |
Other | Other | Maximum | Renewable Power Generation |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 50.00% |  |  |  |  |  |
Other | Other | Maximum | Eliminations and Other |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 50.00% |  |  |  |  |  |
Alliance Pipeline | Alliance Pipeline | Gas Transmission and Midstream |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 50.00% |  |  |  |  |  |
EQUITY INVESTMENTS | $ 430 |  |  |  | 504 |  |
Aux Sable | Aux Sable | Gas Transmission and Midstream |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
EQUITY INVESTMENTS | $ 214 |  |  |  | 238 |  |
Aux Sable | Aux Sable | Minimum | Gas Transmission and Midstream |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 42.70% |  |  |  |  |  |
Aux Sable | Aux Sable | Maximum | Gas Transmission and Midstream |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 50.00% |  |  |  |  |  |
Gulfstream Natural Gas System, L.L.C. | Gulfstream Natural Gas System, L.L.C. | Gas Transmission and Midstream |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 50.00% |  |  |  |  |  |
EQUITY INVESTMENTS | $ 1,274 |  |  |  | 1,180 |  |
Nexus Gas Transmission, LLC | Nexus Gas Transmission, LLC | Gas Transmission and Midstream |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 50.00% |  |  |  |  |  |
EQUITY INVESTMENTS | $ 1,813 |  |  |  | 1,724 |  |
Sabal Trail Transmission, LLC | Sabal Trail Transmission, LLC | Gas Transmission and Midstream |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 50.00% |  |  |  |  |  |
EQUITY INVESTMENTS | $ 1,535 |  |  |  | 1,464 |  |
Southeast Supply Header, LLC | Southeast Supply Header, LLC | Gas Transmission and Midstream |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 50.00% |  |  |  |  |  |
EQUITY INVESTMENTS | $ 86 |  |  |  | 82 |  |
Steckman Ridge, LP | Steckman Ridge, LP | Gas Transmission and Midstream |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 50.00% |  |  |  |  |  |
EQUITY INVESTMENTS | $ 91 |  |  |  | 88 |  |
Vector Pipeline Limited | Vector Pipeline Limited | Gas Transmission and Midstream |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 60.00% |  |  |  |  |  |
EQUITY INVESTMENTS | $ 195 |  |  |  | 189 |  |
Woodfibre LNG Limited Partnership | Woodfibre LNG Limited Partnership | Gas Transmission and Midstream |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 30.00% |  |  |  |  |  |
EQUITY INVESTMENTS | $ 635 |  |  |  | 0 |  |
Offshore - various joint ventures | Offshore - various joint ventures | Gas Transmission and Midstream |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
EQUITY INVESTMENTS | $ 314 |  |  |  | 309 |  |
Offshore - various joint ventures | Offshore - various joint ventures | Minimum | Gas Transmission and Midstream |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 22.00% |  |  |  |  |  |
Offshore - various joint ventures | Offshore - various joint ventures | Maximum | Gas Transmission and Midstream |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 74.30% |  |  |  |  |  |
EIH S.a.r.l. | EIH S.a.r.l. |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  | 49.00%
EIH S.a.r.l. | EIH S.a.r.l. | Renewable Power Generation |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 51.00% |  |  |  |  |  |
EQUITY INVESTMENTS | $ 37 |  |  |  | 38 |  |
Enbridge Renewable Infrastructure Investments S.à.r.l. | Enbridge Renewable Infrastructure Investments S.à.r.l. | Renewable Power Generation |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 51.00% |  |  |  |  |  |
EQUITY INVESTMENTS | $ 163 |  |  |  | 54 |  |
Rampion Offshore Wind Limited | Rampion Offshore Wind Limited | Renewable Power Generation |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 24.90% |  |  |  |  |  |
EQUITY INVESTMENTS | $ 413 |  |  |  | 450 |  |
NextBridge Infrastructure LP | NextBridge Infrastructure LP | Renewable Power Generation |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 25.00% |  |  |  |  |  |
EQUITY INVESTMENTS | $ 241 |  |  |  | 186 |  |
Fairwood Peninsula Energy Corporation | Gas Transmission and Midstream |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
OTHER LONG-TERM INVESTMENTS | 22 |  |  |  | 20 |  |
Emerging Technologies and Other | Renewable Power Generation |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
OTHER LONG-TERM INVESTMENTS | 31 |  |  |  | 32 |  |
Other long-term investments | Eliminations and Other |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
OTHER LONG-TERM INVESTMENTS | $ 488 |  |  |  | $ 290 |  |
Bakken Pipeline Investments, LLC | Bakken Pipeline System |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 75.00% |  |  |  |  |  |
Gray Oak Pipeline, LLC | Gray Oak Pipeline, LLC |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) | 58.50% |  |  |  |  |  |
Gray Oak Pipeline, LLC | Gray Oak Holdings LLC |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  | 22.80% |  |
Éolien Maritime France SAS | Éolien Maritime France SAS |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  | 50.00%
Saint-Nazaire | Saint-Nazaire |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  | 25.50%
Fécamp | Fécamp |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  | 17.90%
Calvados | Calvados |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  | 21.70%

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