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REVENUES - Disaggregation of Revenue (Details) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer $ 4,245 $ 4,077 $ 13,930 $ 13,922
Total revenues 11,466 9,110 34,551 29,079
Revenues from products transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 13 15 47 45
Revenues from products and services transferred over time1        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 4,232 4,062 13,883 13,877
Transportation revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 3,549 3,439 10,568 10,767
Storage and other revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 141 137 450 435
Gas gathering and processing revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 15 7 32 19
Gas distribution revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 496 448 2,755 2,551
Total revenues 492 440 2,769 2,550
Electricity and transmission revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 44 46 125 150
Commodity sales        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 7,279 4,595 20,042 14,920
Total revenues 7,279 4,595 20,042 14,920
Other revenue        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers (58) 438 579 237
Liquids Pipelines        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 2,373 2,256 6,922 6,887
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 time1        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 2,373 2,256 6,922 6,887
Gas Transmission and Midstream        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 1,154 1,148 3,475 3,686
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 0 0
Gas Transmission and Midstream | Revenues from products and services transferred over time1        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 1,154 1,148 3,475 3,686
Gas Distribution and Storage        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 674 627 3,408 3,199
Gas Distribution and Storage | Revenues from products transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 13 15 47 45
Gas Distribution and Storage | Revenues from products and services transferred over time1        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 661 612 3,361 3,154
Renewable Power Generation        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 44 46 125 150
Renewable Power Generation | 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 | Revenues from products and services transferred over time1        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 44 46 125 150
Business segments | Liquids Pipelines        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 2,373 2,256 6,922 6,887
Total revenues 2,370 2,773 7,616 7,252
Business segments | Liquids Pipelines | Transportation revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 2,340 2,234 6,826 6,815
Business segments | Liquids Pipelines | Storage and other revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 33 22 96 72
Business segments | Liquids Pipelines | Gas gathering and processing revenue        
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 revenue        
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 not from contract with customers 0 0 0 0
Business segments | Liquids Pipelines | Other revenue        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers (143) 360 284 (59)
Business segments | Gas Transmission and Midstream        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 1,154 1,148 3,475 3,686
Total revenues 1,159 1,162 3,501 3,722
Business segments | Gas Transmission and Midstream | Transportation revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 1,081 1,077 3,248 3,458
Business segments | Gas Transmission and Midstream | Storage and other revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 58 64 195 209
Business segments | Gas Transmission and Midstream | Gas gathering and processing revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 15 7 32 19
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 revenue        
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 not from contract with customers 0 0 0 0
Business segments | Gas Transmission and Midstream | Other revenue        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 4 14 25 35
Business segments | Gas Distribution and Storage        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 674 627 3,408 3,199
Total revenues 687 621 3,463 3,206
Business segments | Gas Distribution and Storage | Transportation revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 128 128 494 494
Business segments | Gas Distribution and Storage | Storage and other revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 50 51 159 154
Business segments | Gas Distribution and Storage | Gas gathering and processing revenue        
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 496 448 2,755 2,551
Business segments | Gas Distribution and Storage | Electricity and transmission revenue        
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 not from contract with customers 0 0 0 0
Business segments | Gas Distribution and Storage | Other revenue        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 24 (8) 42 (1)
Business segments | Renewable Power Generation        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 44 46 125 150
Total revenues 122 126 371 429
Business segments | Renewable Power Generation | Transportation revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Business segments | Renewable Power Generation | Storage and other revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Business segments | Renewable Power Generation | Gas gathering and processing revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Business segments | Renewable Power Generation | Gas distribution revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Business segments | Renewable Power Generation | Electricity and transmission revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 44 46 125 150
Business segments | Renewable Power Generation | Commodity sales        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 0 0 0 0
Business segments | Renewable Power Generation | Other revenue        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 78 80 246 279
Business segments | Energy Services        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Total revenues 7,290 4,596 20,068 14,943
Business segments | Energy Services | Transportation revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Business segments | Energy Services | Storage and other revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Business segments | Energy Services | Gas gathering and processing revenue        
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 revenue        
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 not from contract with customers 7,279 4,595 20,042 14,920
Business segments | Energy Services | Other revenue        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers (1) (3) 0 1
Eliminations and Other        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Total revenues (162) (168) (468) (473)
Eliminations and Other | Transportation revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Eliminations and Other | Storage and other revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Eliminations and Other | Gas gathering and processing revenue        
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 revenue        
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 not from contract with customers 0 0 0 0
Eliminations and Other | Other revenue        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers (20) (5) (18) (18)
Intersegment revenue        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers (142) (163) (450) (455)
Total revenues (162) (168) (468) (473)
Intersegment revenue | Liquids Pipelines        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 140 157 410 424
Intersegment revenue | Gas Transmission and Midstream        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 1 0 1 1
Intersegment revenue | Gas Distribution and Storage        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers (11) 2 13 8
Intersegment revenue | Renewable Power Generation        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 0 0 0 0
Intersegment revenue | Energy Services        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers $ 12 $ 4 $ 26 $ 22