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REVENUES - Disaggregation of Revenue (Details) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer $ 4,309 $ 4,552 $ 9,845 $ 10,308
Total revenues 7,956 13,263 19,969 26,119
Revenues from products transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 15 20 30 37
Revenues from products and services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 4,294 4,532 9,815 10,271
Transportation revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 3,418 3,514 7,328 7,114
Storage and other revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 146 123 298 257
Gas gathering and processing revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 5 115 12 231
Gas distribution revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 686 754 2,103 2,610
Total revenues 694 755 2,110 2,631
Electricity and transmission revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 54 43 104 93
Commodity sales        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer   3   3
Revenue not from contract with customers 2,936 8,413 10,325 15,045
Total revenues 2,936 8,416 10,325 15,048
Other revenues        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 711 298 (201) 766
Liquids Pipelines        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 2,165 2,255 4,631 4,496
Liquids Pipelines | Revenues from products transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Liquids Pipelines | Revenues from products and services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 2,165 2,255 4,631 4,496
Gas Transmission and Midstream        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 1,197 1,277 2,538 2,583
Gas Transmission and Midstream | Revenues from products transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 3 0 3
Gas Transmission and Midstream | Revenues from products and services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 1,197 1,274 2,538 2,580
Gas Distribution and Storage        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 893 977 2,572 3,136
Gas Distribution and Storage | Revenues from products transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 15 17 30 34
Gas Distribution and Storage | Revenues from products and services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 878 960 2,542 3,102
Renewable Power Generation and Transmission        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 54 43 104 93
Renewable Power Generation and Transmission | Revenues from products transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Renewable Power Generation and Transmission | Revenues from products and services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 54 43 104 93
Energy Services        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Energy Services | Revenues from products transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Energy Services | Revenues from products and services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Business segments | Liquids Pipelines        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 2,165 2,255 4,631 4,496
Total revenues 2,945 2,569 4,479 5,227
Business segments | Liquids Pipelines | Transportation revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 2,141 2,230 4,581 4,444
Business segments | Liquids Pipelines | Storage and other revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 24 25 50 52
Business segments | Liquids Pipelines | Gas gathering and processing revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Business segments | Liquids Pipelines | Gas distribution revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Business segments | Liquids Pipelines | Electricity and transmission revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Business segments | Liquids Pipelines | Commodity sales        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer   0   0
Revenue not from contract with customers 0 0 0 0
Business segments | Liquids Pipelines | Other revenues        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 598 199 (419) 539
Business segments | Gas Transmission and Midstream        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 1,197 1,277 2,538 2,583
Total revenues 1,203 1,288 2,560 2,606
Business segments | Gas Transmission and Midstream | Transportation revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 1,126 1,113 2,381 2,250
Business segments | Gas Transmission and Midstream | Storage and other revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 66 46 145 99
Business segments | Gas Transmission and Midstream | Gas gathering and processing revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 5 115 12 231
Business segments | Gas Transmission and Midstream | Gas distribution revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Business segments | Gas Transmission and Midstream | Electricity and transmission revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Business segments | Gas Transmission and Midstream | Commodity sales        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer   3   3
Revenue not from contract with customers 0 0 0 0
Business segments | Gas Transmission and Midstream | Other revenues        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 5 10 21 20
Business segments | Gas Distribution and Storage        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 893 977 2,572 3,136
Total revenues 903 977 2,585 3,168
Business segments | Gas Distribution and Storage | Transportation revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 151 171 366 420
Business segments | Gas Distribution and Storage | Storage and other revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 56 52 103 106
Business segments | Gas Distribution and Storage | Gas gathering and processing revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Business segments | Gas Distribution and Storage | Gas distribution revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 686 754 2,103 2,610
Business segments | Gas Distribution and Storage | Electricity and transmission revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Business segments | Gas Distribution and Storage | Commodity sales        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer   0   0
Revenue not from contract with customers 0 0 0 0
Business segments | Gas Distribution and Storage | Other revenues        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 8 (3) 7 26
Business segments | Renewable Power Generation and Transmission        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 54 43 104 93
Total revenues 150 137 303 289
Business segments | Renewable Power Generation and Transmission | Transportation revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Business segments | Renewable Power Generation and Transmission | Storage and other revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Business segments | Renewable Power Generation and Transmission | Gas gathering and processing revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Business segments | Renewable Power Generation and Transmission | Gas distribution revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Business segments | Renewable Power Generation and Transmission | Electricity and transmission revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 54 43 104 93
Business segments | Renewable Power Generation and Transmission | Commodity sales        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer   0   0
Revenue not from contract with customers 0 0 0 0
Business segments | Renewable Power Generation and Transmission | Other revenues        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 96 94 199 196
Business segments | Energy Services        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Total revenues 2,949 8,418 10,347 15,091
Business segments | Energy Services | Transportation revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Business segments | Energy Services | Storage and other revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Business segments | Energy Services | Gas gathering and processing revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Business segments | Energy Services | Gas distribution revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Business segments | Energy Services | Electricity and transmission revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Business segments | Energy Services | Commodity sales        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer   0   0
Revenue not from contract with customers 2,936 8,413 10,325 15,045
Business segments | Energy Services | Other revenues        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 11 (7) 4 (1)
Eliminations and Other        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Total revenues (194) (126) (305) (262)
Eliminations and Other | Transportation revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Eliminations and Other | Storage and other revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Eliminations and Other | Gas gathering and processing revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Eliminations and Other | Gas distribution revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Eliminations and Other | Electricity and transmission revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Eliminations and Other | Commodity sales        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer   0   0
Revenue not from contract with customers 0 0 0 0
Eliminations and Other | Other revenues        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers (7) 5 (13) (14)
Intersegment revenues        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers (187) (131) (292) (248)
Total revenues (194) (126) (305) (262)
Intersegment revenues | Liquids Pipelines        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 182 115 267 192
Intersegment revenues | Gas Transmission and Midstream        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 1 1 1 3
Intersegment revenues | Gas Distribution and Storage        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 2 3 6 6
Intersegment revenues | Renewable Power Generation and Transmission        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 0 0 0 0
Intersegment revenues | Energy Services        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers $ 2 $ 12 $ 18 $ 47