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REVENUES - Disaggregation of Revenue (Details) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer $ 4,077 $ 4,275 $ 13,922 $ 14,583
Total revenues 9,110 11,598 29,079 37,717
Revenues from products transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 15 17 45 54
Revenues from products and services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 4,062 4,258 13,877 14,529
Transportation revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 3,439 3,513 10,767 10,627
Storage and other revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 137 148 435 405
Gas gathering and processing revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 7 98 19 329
Gas distribution        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 448 470 2,551 3,080
Total revenues 440 454 2,550 3,085
Electricity and transmission revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 46 46 150 139
Commodity sales        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer       3
Revenue not from contract with customers 4,595 7,396 14,920 22,441
Total revenues 4,595 7,396 14,920 22,444
Other revenues        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 438 (73) 237 693
Liquids Pipelines        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 2,256 2,336 6,887 6,832
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 2,256 2,336 6,887 6,832
Gas Transmission and Midstream        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 1,148 1,240 3,686 3,823
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 3
Gas Transmission and Midstream | Revenues from products and services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 1,148 1,240 3,686 3,820
Gas Distribution and Storage        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 627 653 3,199 3,789
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 45 51
Gas Distribution and Storage | Revenues from products and services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 612 636 3,154 3,738
Renewable Power Generation and Transmission        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 46 46 150 139
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 46 46 150 139
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 2,256 2,336 6,887 6,832
Total revenues 2,773 2,268 7,252 7,495
Business segments | Liquids Pipelines | Transportation revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 2,234 2,305 6,815 6,749
Business segments | Liquids Pipelines | Storage and other revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 22 31 72 83
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        
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
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 360 (156) (59) 383
Business segments | Gas Transmission and Midstream        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 1,148 1,240 3,686 3,823
Total revenues 1,162 1,264 3,722 3,870
Business segments | Gas Transmission and Midstream | Transportation revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 1,077 1,073 3,458 3,323
Business segments | Gas Transmission and Midstream | Storage and other revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 64 69 209 168
Business segments | Gas Transmission and Midstream | Gas gathering and processing revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 7 98 19 329
Business segments | Gas Transmission and Midstream | Gas distribution        
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
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 14 23 35 43
Business segments | Gas Distribution and Storage        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 627 653 3,199 3,789
Total revenues 621 635 3,206 3,803
Business segments | Gas Distribution and Storage | Transportation revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 128 135 494 555
Business segments | Gas Distribution and Storage | Storage and other revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 51 48 154 154
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        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 448 470 2,551 3,080
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
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) (21) (1) 5
Business segments | Renewable Power Generation and Transmission        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 46 46 150 139
Total revenues 126 128 429 417
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        
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 46 46 150 139
Business segments | Renewable Power Generation and Transmission | Commodity sales        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer       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 80 82 279 278
Business segments | Energy Services        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Total revenues 4,596 7,403 14,943 22,494
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        
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
Revenue not from contract with customers 4,595 7,396 14,920 22,441
Business segments | Energy Services | Other revenues        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers (3) (1) 1 (2)
Eliminations and Other        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 0 0 0 0
Total revenues (168) (100) (473) (362)
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        
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
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 (5) 0 (18) (14)
Intersegment revenues        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers (163) (100) (455) (348)
Total revenues (168) (100) (473) (362)
Intersegment revenues | Liquids Pipelines        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 157 88 424 280
Intersegment revenues | Gas Transmission and Midstream        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 0 1 1 4
Intersegment revenues | Gas Distribution and Storage        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 2 3 8 9
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 $ 4 $ 8 $ 22 $ 55