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LONG-TERM INVESTMENTS - Schedule of Long-Term Investments (Details) $ in Millions, $ in Millions |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2024 CAD ($) | Oct. 31, 2024 USD ($) | Apr. 01, 2024 CAD ($) | Jan. 09, 2023 CAD ($) | Jan. 09, 2023 USD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2022 CAD ($) | May 29, 2024 | May 28, 2024 | Nov. 15, 2023 | Mar. 18, 2021 project
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total long-term investments |  |  |  |  |  | $ 20,691 | $ 16,793 |  |  |  |  |
Proceeds from sale of equity method investments |  |  |  |  |  | 0 | 0 | $ 522 |  |  |  |
Proceeds from non-recourse debt |  |  |  |  |  | 99 | 71 | $ 0 |  |  |  |
Long-Term Investments |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total long-term investments |  |  |  |  |  | $ 20,691 | 16,793 |  |  |  |  |
Cactus II Pipeline LLC | Long-Term Investments | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 30.00% |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 651 | 618 |  |  |  |  |
DCP Midstream, LLC | Long-Term Investments |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 56.50% |  |  |  |  |  |
DCP Midstream, LLC | Long-Term Investments | Class A units |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 23.40% |  |  |  |  |  |
DCP Midstream, LLC | Long-Term Investments | Class B units |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 90.00% |  |  |  |  |  |
DCP Midstream, LLC | Long-Term Investments | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 90.00% |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 1,554 | 1,486 |  |  |  |  |
DCP Midstream, LLC | Long-Term Investments | Gas Transmission |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 23.40% |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 480 | 367 |  |  |  |  |
Illinois Extension Pipeline Company, L.L.C. | Long-Term Investments | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 65.00% |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 608 | 584 |  |  |  |  |
MarEn Bakken Company LLC | Long-Term Investments | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 75.00% |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 2,296 | 1,819 |  |  |  |  |
Seaway Crude Holdings LLC | Long-Term Investments | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 50.00% |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 2,820 | 2,661 |  |  |  |  |
Other | Long-Term Investments |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other long-term investments |  |  |  |  |  | 1,032 | 430 |  |  |  |  |
Other | Long-Term Investments | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 96 | 84 |  |  |  |  |
Other | Long-Term Investments | Liquids Pipelines | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 30.00% |  |  |  |  |  |
Other | Long-Term Investments | Liquids Pipelines | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 43.80% |  |  |  |  |  |
Other | Long-Term Investments | Gas Transmission |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other long-term investments |  |  |  |  |  | $ 23 | 22 |  |  |  |  |
Other | Long-Term Investments | Gas Distribution and Storage |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  | 67 | 22 |  |  |  |  |
Other long-term investments |  |  |  |  |  | $ 27 | 24 |  |  |  |  |
Other | Long-Term Investments | Gas Distribution and Storage | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 17.00% |  |  |  |  |  |
Other | Long-Term Investments | Gas Distribution and Storage | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 50.00% |  |  |  |  |  |
Other | Long-Term Investments | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 93 | 110 |  |  |  |  |
Other long-term investments |  |  |  |  |  | $ 21 | 21 |  |  |  |  |
Other | Long-Term Investments | Renewable Power Generation | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 16.40% |  |  |  |  |  |
Other | Long-Term Investments | Renewable Power Generation | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 50.00% |  |  |  |  |  |
Other | Long-Term Investments | Gas Transmission |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 49 | 0 |  |  |  |  |
Other | Long-Term Investments | Gas Transmission | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 21.30% |  |  |  |  |  |
Other | Long-Term Investments | Gas Transmission | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 45.00% |  |  |  |  |  |
Alliance Pipeline | Long-Term Investments | Gas Transmission |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 50.00% |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 0 | 359 |  |  |  |  |
Aux Sable | Long-Term Investments | Gas Transmission |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 42.70% |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 0 | 229 |  |  |  |  |
Aux Sable | Long-Term Investments | Gas Transmission | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 42.70% |  |  |  |  |  |
Aux Sable | Long-Term Investments | Gas Transmission | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 50.00% |  |  |  |  |  |
Delaware Basin Residue, LLC | Long-Term Investments | Gas Transmission |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) | 15.00% | 15.00% |  |  |  | 15.00% |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 319 | 0 |  |  |  |  |
Payments to acquire equity method investments | $ 303 | $ 220 |  |  |  |  |  |  |  |  |  |
Gulfstream Natural Gas System, L.L.C. | Long-Term Investments | Gas Transmission |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 50.00% |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 1,316 | 1,224 |  |  |  |  |
NEXUS Gas Transmission, LLC | Long-Term Investments | Gas Transmission |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 50.00% |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 1,301 | 1,220 |  |  |  |  |
Sabal Trail Transmission, LLC | Long-Term Investments | Gas Transmission |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 50.00% |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 1,565 | 1,467 |  |  |  |  |
Southeast Supply Header, LLC | Long-Term Investments | Gas Transmission |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 50.00% |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 355 | 80 |  |  |  |  |
Steckman Ridge, LP | Long-Term Investments | Gas Transmission |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 50.00% |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 101 | 87 |  |  |  |  |
Vector Pipeline Limited | Long-Term Investments | Gas Transmission |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 60.00% |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 193 | 191 |  |  |  |  |
Whistler Parent JV |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  |  |  |  | 19.00% |  |  |
Whistler Parent JV | Long-Term Investments | Gas Transmission |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 19.00% |  |  | 19.00% |  |  |
Equity method investments |  |  |  |  |  | $ 1,102 | 0 |  |  |  |  |
Woodfibre LNG LP | Long-Term Investments | Gas Transmission |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 30.00% |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 1,275 | 777 |  |  |  |  |
Offshore - various joint ventures | Long-Term Investments | Gas Transmission |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 260 | 217 |  |  |  |  |
Offshore - various joint ventures | Long-Term Investments | Gas Transmission | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 22.00% |  |  |  |  |  |
Offshore - various joint ventures | Long-Term Investments | Gas Transmission | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 74.30% |  |  |  |  |  |
East-West Tie Limited Partnership | Long-Term Investments | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 24.10% |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 106 | 132 |  |  |  |  |
EIH S.a.r.l. | Long-Term Investments | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 51.00% |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 89 | 52 |  |  |  |  |
Fox Squirrel Solar LLC |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  |  |  |  |  |  | 50.00% |
Fox Squirrel Solar LLC | Long-Term Investments | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 50.00% |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 783 | 312 |  |  |  |  |
Hohe See and Albatros Offshore Wind Facilities | Long-Term Investments | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 49.90% |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 1,606 | 1,701 |  |  |  |  |
Rampion Offshore Wind Limited | Long-Term Investments | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 24.90% |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 387 | 391 |  |  |  |  |
Ara Divert HoldCo, Inc. | Long-Term Investments | Gas Transmission |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other long-term investments |  |  |  |  |  | $ 116 | $ 106 |  |  |  |  |
Gray Oak Pipeline, LLC | Long-Term Investments |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  | 68.50% | 68.50% | 58.50% |  |  |  |  |  |
Equity method investment direct ownership interest (as percent) |  |  |  | 0.100 | 0.100 |  |  |  |  |  |  |
Cash consideration |  |  |  | $ 230 | $ 172 |  |  |  |  |  |  |
Gray Oak Pipeline, LLC | Long-Term Investments | DCP Midstream, LLC |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 65.00% |  |  |  |  |  |
Bakken Pipeline LLC | Long-Term Investments | MarEn Bakken Company LLC |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 49.00% |  |  |  |  |  |
Bakken Pipeline System | Long-Term Investments |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 27.60% |  |  |  |  |  |
Bakken Pipeline System | Long-Term Investments | Bakken Pipeline LLC |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 75.00% |  |  |  |  |  |
Pembina Pipeline Corporation | Long-Term Investments |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  | 50.00% |  |  |  |  |  |  |  |  |
Proceeds from sale of equity method investments |  |  | $ 3,100 |  |  |  |  |  |  |  |  |
Proceeds from non-recourse debt |  |  | $ 300 |  |  |  |  |  |  |  |  |
DCP Midstream, LP | Long-Term Investments |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 13.20% |  |  |  |  |  |
Rio Bravo |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  |  |  |  | 25.00% | 100.00% |  |
Special ownership interest (percent) |  |  |  |  |  |  |  |  | 39.30% |  |  |
Rio Bravo | Long-Term Investments | Whistler Parent JV |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  |  |  |  | 100.00% |  |  |
Rio Bravo | Long-Term Investments | Gas Transmission |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Special ownership interest (percent) |  |  |  |  |  |  |  |  | 25.00% |  |  |
Eolien Maritime France Sas | Long-Term Investments |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 50.00% |  |  |  |  |  |
Number of offshore wind projects | project |  |  |  |  |  |  |  |  |  |  |  | 3
Saint-Nazaire | Long-Term Investments |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  |  |  |  |  |  |  | 25.50%
Fécamp | Long-Term Investments |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  |  |  |  |  |  |  | 17.90%
Calvados | Long-Term Investments |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  |  |  |  |  |  |  | 21.70%

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