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REVENUES - Disaggregation of Revenue (Details) - CAD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 5,441	$ 5,536
Total revenues	12,187	12,013
Revenues from products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	17	15
Revenues from products and services transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	5,424	5,521
Transportation revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3,666	3,910
Storage and other revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	158	152
Gas gathering and processing revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	7	7
Gas distribution revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,534	1,417
Total revenues	1,540	1,416
Electricity and transmission revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	76	50
Commodity sales
Disaggregation of Revenue [Line Items]
Revenue not from contract with customers	6,429	7,389
Total revenues	6,429	7,389
Other revenues
Disaggregation of Revenue [Line Items]
Revenue not from contract with customers	317	(912)
Liquids Pipelines
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2,355	2,466
Liquids Pipelines | Revenues from products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Liquids Pipelines | Revenues from products and services transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2,355	2,466
Gas Transmission and Midstream
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,202	1,341
Gas Transmission and Midstream | Revenues from products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Gas Transmission and Midstream | Revenues from products and services transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,202	1,341
Gas Distribution and Storage
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,808	1,679
Gas Distribution and Storage | Revenues from products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	17	15
Gas Distribution and Storage | Revenues from products and services transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,791	1,664
Renewable Power Generation
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	76	50
Renewable Power Generation | Revenues from products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Renewable Power Generation | Revenues from products and services transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	76	50
Business segments | Liquids Pipelines
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2,355	2,466
Total revenues	2,699	1,534
Business segments | Liquids Pipelines | Transportation revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2,329	2,440
Business segments | Liquids Pipelines | Storage and other revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	26	26
Business segments | Liquids Pipelines | Gas gathering and processing revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Business segments | Liquids Pipelines | Gas distribution revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Business segments | Liquids Pipelines | Electricity and transmission revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Business segments | Liquids Pipelines | Commodity sales
Disaggregation of Revenue [Line Items]
Revenue not from contract with customers	0	0
Business segments | Liquids Pipelines | Other revenues
Disaggregation of Revenue [Line Items]
Revenue not from contract with customers	212	(1,017)
Business segments | Gas Transmission and Midstream
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,202	1,341
Total revenues	1,214	1,357
Business segments | Gas Transmission and Midstream | Transportation revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,121	1,255
Business segments | Gas Transmission and Midstream | Storage and other revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	74	79
Business segments | Gas Transmission and Midstream | Gas gathering and processing revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	7	7
Business segments | Gas Transmission and Midstream | Gas distribution revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Business segments | Gas Transmission and Midstream | Electricity and transmission revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Business segments | Gas Transmission and Midstream | Commodity sales
Disaggregation of Revenue [Line Items]
Revenue not from contract with customers	0	0
Business segments | Gas Transmission and Midstream | Other revenues
Disaggregation of Revenue [Line Items]
Revenue not from contract with customers	12	16
Business segments | Gas Distribution and Storage
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,808	1,679
Total revenues	1,823	1,682
Business segments | Gas Distribution and Storage | Transportation revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	216	215
Business segments | Gas Distribution and Storage | Storage and other revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	58	47
Business segments | Gas Distribution and Storage | Gas gathering and processing revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Business segments | Gas Distribution and Storage | Gas distribution revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,534	1,417
Business segments | Gas Distribution and Storage | Electricity and transmission revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Business segments | Gas Distribution and Storage | Commodity sales
Disaggregation of Revenue [Line Items]
Revenue not from contract with customers	0	0
Business segments | Gas Distribution and Storage | Other revenues
Disaggregation of Revenue [Line Items]
Revenue not from contract with customers	6	(1)
Business segments | Renewable Power Generation
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	76	50
Total revenues	167	153
Business segments | Renewable Power Generation | Transportation revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Business segments | Renewable Power Generation | Storage and other revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Business segments | Renewable Power Generation | Gas gathering and processing revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Business segments | Renewable Power Generation | Gas distribution revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Business segments | Renewable Power Generation | Electricity and transmission revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	76	50
Business segments | Renewable Power Generation | Commodity sales
Disaggregation of Revenue [Line Items]
Revenue not from contract with customers	0	0
Business segments | Renewable Power Generation | Other revenues
Disaggregation of Revenue [Line Items]
Revenue not from contract with customers	91	103
Business segments | Energy Services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Total revenues	6,433	7,398
Business segments | Energy Services | Transportation revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Business segments | Energy Services | Storage and other revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Business segments | Energy Services | Gas gathering and processing revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Business segments | Energy Services | Gas distribution revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Business segments | Energy Services | Electricity and transmission revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Business segments | Energy Services | Commodity sales
Disaggregation of Revenue [Line Items]
Revenue not from contract with customers	6,429	7,389
Business segments | Energy Services | Other revenues
Disaggregation of Revenue [Line Items]
Revenue not from contract with customers	0	(7)
Eliminations and Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Total revenues	(149)	(111)
Eliminations and Other | Transportation revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Eliminations and Other | Storage and other revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Eliminations and Other | Gas gathering and processing revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Eliminations and Other | Gas distribution revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Eliminations and Other | Electricity and transmission revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Eliminations and Other | Commodity sales
Disaggregation of Revenue [Line Items]
Revenue not from contract with customers	0	0
Eliminations and Other | Other revenues
Disaggregation of Revenue [Line Items]
Revenue not from contract with customers	(4)	(6)
Intersegment revenues
Disaggregation of Revenue [Line Items]
Revenue not from contract with customers	(145)	(105)
Total revenues	(149)	(111)
Intersegment revenues | Liquids Pipelines
Disaggregation of Revenue [Line Items]
Revenue not from contract with customers	132	85
Intersegment revenues | Gas Transmission and Midstream
Disaggregation of Revenue [Line Items]
Revenue not from contract with customers	0	0
Intersegment revenues | Gas Distribution and Storage
Disaggregation of Revenue [Line Items]
Revenue not from contract with customers	9	4
Intersegment revenues | Renewable Power Generation
Disaggregation of Revenue [Line Items]
Revenue not from contract with customers	0	0
Intersegment revenues | Energy Services
Disaggregation of Revenue [Line Items]
Revenue not from contract with customers	$ 4	$ 16

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