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%