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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

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