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
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%