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LONG-TERM INVESTMENTS - Schedule of Long-Term Investments (Details) $ in Millions, $ in Millions | Dec. 13, 2023 CAD ($) | Jan. 09, 2023 CAD ($) | Jan. 09, 2023 USD ($) | Nov. 29, 2022 CAD ($) | Nov. 29, 2022 USD ($) | Nov. 02, 2022 CAD ($) | Nov. 02, 2022 USD ($) | Dec. 31, 2023 CAD ($) | Nov. 30, 2023 | Nov. 15, 2023 | Dec. 31, 2022 CAD ($) | Aug. 17, 2022 | Aug. 16, 2022 | Oct. 12, 2021 | Mar. 18, 2021 project
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LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term investments |  |  |  |  |  |  |  | $ 16,793 |  |  | $ 15,936 |  |  |  |
Woodfibre LNG Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments |  |  |  | $ 533 | $ 392 |  |  |  |  |  |  |  |  |  |
DCP Midstream, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 90.00% |  |  |  |  |  |  |
Fox Squirrel Solar LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
Gray Oak Pipeline, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 65.00% |  |  |  |  |  |  |
Gray Oak Holdings LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 58.50% | 22.80% |  |
DCP Midstream, LP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 13.20% |  |  |  |  |  |  |
Éolien Maritime France SAS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of offshore wind projects | project |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3
Other long-term investments | Gas Distribution and Storage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term investments |  |  |  |  |  |  |  | $ 24 |  |  | 48 |  |  |  |
MaRen Bakken Company LLC | MaRen Bakken Company LLC | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 75.00% |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  | $ 1,819 |  |  | 1,968 |  |  |  |
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 method investments |  |  |  |  |  |  |  | $ 1,486 |  |  | 1,394 |  |  |  |
DCP Midstream, LLC | DCP Midstream, LLC | Gas Transmission and Midstream |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 23.40% |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  | $ 367 |  |  | 317 |  |  |  |
DCP Midstream, LLC | DCP Midstream, LP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 56.50% |  |  |  |  |  |  |
Seaway Crude Holdings LLC | Seaway Crude Holdings LLC | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  | $ 2,661 |  |  | 2,744 |  |  |  |
Illinois Extension Pipeline Company, LLC | Illinois Extension Pipeline Company, LLC | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 65.00% |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  | $ 584 |  |  | 622 |  |  |  |
Cactus II Pipeline, LLC | Cactus II Pipeline, LLC | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  | 10.00% | 10.00% | 30.00% |  |  |  |  |  | 20.00% |
Equity method investments |  |  |  |  |  |  |  | $ 618 |  |  | 658 |  |  |  |
Cash consideration |  |  |  |  |  | $ 241 | $ 177 |  |  |  |  |  |  |  |
Other | Other | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  | 84 |  |  | 76 |  |  |  |
Other | Other | Gas Distribution and Storage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  | 22 |  |  | 20 |  |  |  |
Other | Other | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  | $ 110 |  |  | 107 |  |  |  |
Other | Other | Minimum | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 3000.00% |  |  |  |  |  |  |
Other | Other | Minimum | Gas Distribution and Storage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |  |
Other | Other | Minimum | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 1640.00% |  |  |  |  |  |  |
Other | Other | Maximum | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 4380.00% |  |  |  |  |  |  |
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) |  |  |  |  |  |  |  | 5000.00% |  |  |  |  |  |  |
Alliance Pipeline | Alliance Pipeline |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 method investments |  |  |  |  |  |  |  | $ 359 |  |  | 430 |  |  |  |
Aux Sable | Aux Sable | Gas Transmission and Midstream |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  | $ 229 |  |  | 214 |  |  |  |
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% |  |  |  |  |  |  |
Pembina Pipeline Corporation | Pembina Pipeline Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments | $ 3,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments on nonrecourse debt | $ 300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 method investments |  |  |  |  |  |  |  | $ 1,224 |  |  | 1,274 |  |  |  |
NEXUS Gas Transmission, LLC | NEXUS Gas Transmission, LLC | Gas Transmission and Midstream |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  | $ 1,220 |  |  | 1,813 |  |  |  |
Sabal Trail Transmission, LLC | Sabal Trail Transmission, LLC | Gas Transmission and Midstream |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  | $ 1,467 |  |  | 1,535 |  |  |  |
Southeast Supply Header, LLC | Southeast Supply Header, LLC | Gas Transmission and Midstream |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  | $ 80 |  |  | 86 |  |  |  |
Steckman Ridge, LP | Steckman Ridge, LP | Gas Transmission and Midstream |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  | $ 87 |  |  | 91 |  |  |  |
Vector Pipeline Limited | Vector Pipeline Limited | Gas Transmission and Midstream |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 60.00% |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  | $ 191 |  |  | 195 |  |  |  |
Woodfibre LNG Limited Partnership10 | Woodfibre LNG Limited Partnership10 | Gas Transmission and Midstream |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  | $ 777 |  |  | 635 |  |  |  |
Offshore - various joint ventures | Offshore - various joint ventures | Gas Transmission and Midstream |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  | $ 217 |  |  | 314 |  |  |  |
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. | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 51.00% |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  | $ 52 |  |  | 37 |  |  |  |
Hohe See and Albatros Offshore Wind Facilities | Hohe See and Albatros Offshore Wind Facilities | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 49.90% |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  | $ 1,701 |  |  | 163 |  |  |  |
Rampion Offshore Wind Limited | Rampion Offshore Wind Limited | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 24.90% |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  | $ 391 |  |  | 413 |  |  |  |
East-West Tie Limited Partnership | East-West Tie Limited Partnership | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 24.10% |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  | $ 132 |  |  | 241 |  |  |  |
Fox Squirrel Solar LLC | Fox Squirrel Solar LLC | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 50.00% | 50.00% |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  | $ 312 |  |  | 0 |  |  |  |
Ara Divert HoldCo, Inc. | Gas Transmission and Midstream |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term investments |  |  |  |  |  |  |  | 106 |  |  | 0 |  |  |  |
Other long-term investments | Gas Transmission and Midstream |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term investments |  |  |  |  |  |  |  | 22 |  |  | 22 |  |  |  |
Other long-term investments | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term investments |  |  |  |  |  |  |  | 21 |  |  | 31 |  |  |  |
Other long-term investments | Eliminations and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term investments |  |  |  |  |  |  |  | $ 430 |  |  | $ 488 |  |  |  |
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) |  | 68.50% | 68.50% |  |  |  |  | 58.50% |  |  |  |  |  |  |
Cash consideration |  | $ 230 | $ 172 |  |  |  |  |  |  |  |  |  |  |  |
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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