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REVENUES - Disaggregation of Revenue (Details) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | $ 4,275 | $ 4,424 | $ 14,583 | $ 15,832
Total revenues | 11,598 | 11,345 | 37,717 | 34,816
Revenues from products transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 17 | 318 | 54 | 1,695
Revenues from products and services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 4,258 | 4,106 | 14,529 | 14,137
Transportation revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 3,513 | 3,266 | 10,627 | 9,703
Storage and other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 148 | 139 | 405 | 450
Gas gathering and processing revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 98 | 200 | 329 | 636
Gas distribution revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 470 | 478 | 3,080 | 3,260
Total revenues | 454 | 478 | 3,085 | 3,260
Electricity and transmission revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 46 | 43 | 139 | 153
Commodity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer |  | 298 | 3 | 1,630
Revenue not from contract with customers | 7,396 | 6,621 | 22,441 | 19,008
Total revenues | 7,396 | 6,919 | 22,444 | 20,638
Other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | (73) | 300 | 693 | (24)
Liquids Pipelines |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 2,336 | 2,221 | 6,832 | 6,440
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 | 2,336 | 2,221 | 6,832 | 6,440
Gas Transmission and Midstream |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1,240 | 1,530 | 3,823 | 5,319
Gas Transmission and Midstream | Revenues from products transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 298 | 3 | 1,630
Gas Transmission and Midstream | Revenues from products and services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1,240 | 1,232 | 3,820 | 3,689
Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 653 | 630 | 3,789 | 3,920
Gas Distribution | Revenues from products transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 17 | 20 | 51 | 65
Gas Distribution | Revenues from products and services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 636 | 610 | 3,738 | 3,855
Renewable Power Generation and Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 46 | 43 | 139 | 153
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 | 43 | 139 | 153
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 | 2,336 | 2,221 | 6,832 | 6,440
Total revenues | 2,268 | 2,529 | 7,495 | 6,388
Business segments | Liquids Pipelines | Transportation revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 2,305 | 2,190 | 6,749 | 6,327
Business segments | Liquids Pipelines | Storage and other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 31 | 31 | 83 | 113
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 | 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 | (156) | 222 | 383 | (308)
Business segments | Gas Transmission and Midstream |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1,240 | 1,530 | 3,823 | 5,319
Total revenues | 1,264 | 1,528 | 3,870 | 5,329
Business segments | Gas Transmission and Midstream | Transportation revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1,073 | 979 | 3,323 | 2,889
Business segments | Gas Transmission and Midstream | Storage and other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 69 | 53 | 168 | 164
Business segments | Gas Transmission and Midstream | Gas gathering and processing revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 98 | 200 | 329 | 636
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 |  | 298 | 3 | 1,630
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 | 23 | (6) | 43 | 2
Business segments | Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 653 | 630 | 3,789 | 3,920
Total revenues | 635 | 645 | 3,803 | 3,952
Business segments | Gas Distribution | Transportation revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 135 | 97 | 555 | 487
Business segments | Gas Distribution | Storage and other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 48 | 55 | 154 | 173
Business segments | Gas Distribution | Gas gathering and processing revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Business segments | Gas Distribution | Gas distribution revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 470 | 478 | 3,080 | 3,260
Business segments | Gas Distribution | Electricity and transmission revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Business segments | Gas Distribution | Commodity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer |  | 0 | 0 | 0
Revenue not from contract with customers | 0 | 0 | 0 | 0
Business segments | Gas Distribution | Other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | (21) | 11 | 5 | 22
Business segments | Renewable Power Generation and Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 46 | 43 | 139 | 153
Total revenues | 128 | 117 | 417 | 423
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 | 46 | 43 | 139 | 153
Business segments | Renewable Power Generation and Transmission | Commodity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer |  | 0 | 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 | 82 | 74 | 278 | 270
Business segments | Energy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Total revenues | 7,403 | 6,646 | 22,494 | 19,114
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 | 0
Revenue not from contract with customers | 7,396 | 6,621 | 22,441 | 19,008
Business segments | Energy Services | Other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | (1) | 0 | (2) | 0
Eliminations and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Total revenues | (100) | (120) | (362) | (390)
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 | 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 | 0 | (1) | (14) | (10)
Intersegment Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | (100) | (119) | (348) | (380)
Total revenues | (100) | (120) | (362) | (390)
Intersegment Eliminations | Liquids Pipelines |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 88 | 86 | 280 | 256
Intersegment Eliminations | Gas Transmission and Midstream |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 1 | 4 | 4 | 8
Intersegment Eliminations | Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 3 | 4 | 9 | 10
Intersegment Eliminations | Renewable Power Generation and Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 0 | 0 | 0 | 0
Intersegment Eliminations | Energy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | $ 8 | $ 25 | $ 55 | $ 106

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