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REVENUES - Disaggregation of Revenue (Details) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | $ 4,309 | $ 4,552 | $ 9,845 | $ 10,308
Total revenues | 7,956 | 13,263 | 19,969 | 26,119
Revenues from products transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 15 | 20 | 30 | 37
Revenues from products and services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 4,294 | 4,532 | 9,815 | 10,271
Transportation revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 3,418 | 3,514 | 7,328 | 7,114
Storage and other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 146 | 123 | 298 | 257
Gas gathering and processing revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 5 | 115 | 12 | 231
Gas distribution revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 686 | 754 | 2,103 | 2,610
Total revenues | 694 | 755 | 2,110 | 2,631
Electricity and transmission revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 54 | 43 | 104 | 93
Commodity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer |  | 3 |  | 3
Revenue not from contract with customers | 2,936 | 8,413 | 10,325 | 15,045
Total revenues | 2,936 | 8,416 | 10,325 | 15,048
Other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 711 | 298 | (201) | 766
Liquids Pipelines |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 2,165 | 2,255 | 4,631 | 4,496
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 | 2,165 | 2,255 | 4,631 | 4,496
Gas Transmission and Midstream |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1,197 | 1,277 | 2,538 | 2,583
Gas Transmission and Midstream | Revenues from products transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 3 | 0 | 3
Gas Transmission and Midstream | Revenues from products and services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1,197 | 1,274 | 2,538 | 2,580
Gas Distribution and Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 893 | 977 | 2,572 | 3,136
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 | 30 | 34
Gas Distribution and Storage | Revenues from products and services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 878 | 960 | 2,542 | 3,102
Renewable Power Generation and Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 54 | 43 | 104 | 93
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 | 54 | 43 | 104 | 93
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 | 2,165 | 2,255 | 4,631 | 4,496
Total revenues | 2,945 | 2,569 | 4,479 | 5,227
Business segments | Liquids Pipelines | Transportation revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 2,141 | 2,230 | 4,581 | 4,444
Business segments | Liquids Pipelines | Storage and other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 24 | 25 | 50 | 52
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
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 | 598 | 199 | (419) | 539
Business segments | Gas Transmission and Midstream |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1,197 | 1,277 | 2,538 | 2,583
Total revenues | 1,203 | 1,288 | 2,560 | 2,606
Business segments | Gas Transmission and Midstream | Transportation revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1,126 | 1,113 | 2,381 | 2,250
Business segments | Gas Transmission and Midstream | Storage and other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 66 | 46 | 145 | 99
Business segments | Gas Transmission and Midstream | Gas gathering and processing revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 5 | 115 | 12 | 231
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 |  | 3 |  | 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 | 5 | 10 | 21 | 20
Business segments | Gas Distribution and Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 893 | 977 | 2,572 | 3,136
Total revenues | 903 | 977 | 2,585 | 3,168
Business segments | Gas Distribution and Storage | Transportation revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 151 | 171 | 366 | 420
Business segments | Gas Distribution and Storage | Storage and other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 56 | 52 | 103 | 106
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 revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 686 | 754 | 2,103 | 2,610
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 |  | 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 | (3) | 7 | 26
Business segments | Renewable Power Generation and Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 54 | 43 | 104 | 93
Total revenues | 150 | 137 | 303 | 289
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 | 54 | 43 | 104 | 93
Business segments | Renewable Power Generation and Transmission | Commodity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer |  | 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 | 96 | 94 | 199 | 196
Business segments | Energy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Total revenues | 2,949 | 8,418 | 10,347 | 15,091
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
Revenue not from contract with customers | 2,936 | 8,413 | 10,325 | 15,045
Business segments | Energy Services | Other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 11 | (7) | 4 | (1)
Eliminations and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Total revenues | (194) | (126) | (305) | (262)
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
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 | (7) | 5 | (13) | (14)
Intersegment revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | (187) | (131) | (292) | (248)
Total revenues | (194) | (126) | (305) | (262)
Intersegment revenues | Liquids Pipelines |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 182 | 115 | 267 | 192
Intersegment revenues | Gas Transmission and Midstream |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 1 | 1 | 1 | 3
Intersegment revenues | Gas Distribution and Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 2 | 3 | 6 | 6
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 | $ 2 | $ 12 | $ 18 | $ 47

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