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REVENUES - Disaggregation of Revenue (Details) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | $ 4,294 | $ 4,309 | $ 9,685 | $ 9,845
Total revenues | 10,948 | 7,956 | 23,085 | 19,969
Revenues from products transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 17 | 15 | 34 | 30
Revenues from products and services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 4,277 | 4,294 | 9,651 | 9,815
Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 3,353 | 3,418 | 7,019 | 7,328
Storage and other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 151 | 146 | 309 | 298
Gas gathering and processing revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 10 | 5 | 17 | 12
Gas distribution revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 725 | 686 | 2,259 | 2,103
Total revenues | 737 | 694 | 2,277 | 2,110
Electricity and transmission revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 55 | 54 | 81 | 104
Commodity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 6,334 | 2,936 | 12,763 | 10,325
Total revenues | 6,334 | 2,936 | 12,763 | 10,325
Other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 320 | 711 | 637 | (201)
Liquids Pipelines |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 2,194 | 2,165 | 4,549 | 4,631
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 | 2,194 | 2,165 | 4,549 | 4,631
Gas Transmission and Midstream |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1,119 | 1,197 | 2,321 | 2,538
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 time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1,119 | 1,197 | 2,321 | 2,538
Gas Distribution and Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 926 | 893 | 2,734 | 2,572
Gas Distribution and Storage | Revenues from products transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 17 | 15 | 34 | 30
Gas Distribution and Storage | Revenues from products and services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 909 | 878 | 2,700 | 2,542
Renewable Power Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 55 | 54 | 81 | 104
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 time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 55 | 54 | 81 | 104
Business segments | Liquids Pipelines |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 2,194 | 2,165 | 4,549 | 4,631
Total revenues | 2,547 | 2,945 | 5,246 | 4,479
Business segments | Liquids Pipelines | Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 2,157 | 2,141 | 4,486 | 4,581
Business segments | Liquids Pipelines | Storage and other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 37 | 24 | 63 | 50
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 | 215 | 598 | 427 | (419)
Business segments | Gas Transmission and Midstream |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1,119 | 1,197 | 2,321 | 2,538
Total revenues | 1,128 | 1,203 | 2,342 | 2,560
Business segments | Gas Transmission and Midstream | Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1,046 | 1,126 | 2,167 | 2,381
Business segments | Gas Transmission and Midstream | Storage and other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 63 | 66 | 137 | 145
Business segments | Gas Transmission and Midstream | Gas gathering and processing revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 10 | 5 | 17 | 12
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 | 9 | 5 | 21 | 21
Business segments | Gas Distribution and Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 926 | 893 | 2,734 | 2,572
Total revenues | 953 | 903 | 2,776 | 2,585
Business segments | Gas Distribution and Storage | Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 150 | 151 | 366 | 366
Business segments | Gas Distribution and Storage | Storage and other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 51 | 56 | 109 | 103
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 | 725 | 686 | 2,259 | 2,103
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 | 12 | 8 | 18 | 7
Business segments | Renewable Power Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 55 | 54 | 81 | 104
Total revenues | 132 | 150 | 249 | 303
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 | 55 | 54 | 81 | 104
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 | 77 | 96 | 168 | 199
Business segments | Energy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Total revenues | 6,345 | 2,949 | 12,778 | 10,347
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 | 6,334 | 2,936 | 12,763 | 10,325
Business segments | Energy Services | Other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 1 | 11 | 1 | 4
Eliminations and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Total revenues | (157) | (194) | (306) | (305)
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 | 6 | (7) | 2 | (13)
Intersegment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | (163) | (187) | (308) | (292)
Total revenues | (157) | (194) | (306) | (305)
Intersegment revenue | Liquids Pipelines |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 138 | 182 | 270 | 267
Intersegment revenue | Gas Transmission and Midstream |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 0 | 1 | 0 | 1
Intersegment revenue | Gas Distribution and Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 15 | 2 | 24 | 6
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 | $ 10 | $ 2 | $ 14 | $ 18

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