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REVENUES - Disaggregation of Revenue (Details) - CAD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | $ 5,441 | $ 5,536
Total revenues | 12,187 | 12,013
Revenues from products transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 17 | 15
Revenues from products and services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 5,424 | 5,521
Transportation revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 3,666 | 3,910
Storage and other revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 158 | 152
Gas gathering and processing revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 7 | 7
Gas distribution revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,534 | 1,417
Total revenues | 1,540 | 1,416
Electricity and transmission revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 76 | 50
Commodity sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 6,429 | 7,389
Total revenues | 6,429 | 7,389
Other revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 317 | (912)
Liquids Pipelines |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 2,355 | 2,466
Liquids Pipelines | Revenues from products transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Liquids Pipelines | Revenues from products and services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 2,355 | 2,466
Gas Transmission and Midstream |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,202 | 1,341
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
Gas Transmission and Midstream | Revenues from products and services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,202 | 1,341
Gas Distribution and Storage |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,808 | 1,679
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
Gas Distribution and Storage | Revenues from products and services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,791 | 1,664
Renewable Power Generation |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 76 | 50
Renewable Power Generation | Revenues from products transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Renewable Power Generation | Revenues from products and services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 76 | 50
Business segments | Liquids Pipelines |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 2,355 | 2,466
Total revenues | 2,699 | 1,534
Business segments | Liquids Pipelines | Transportation revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 2,329 | 2,440
Business segments | Liquids Pipelines | Storage and other revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 26 | 26
Business segments | Liquids Pipelines | Gas gathering and processing revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Business segments | Liquids Pipelines | Gas distribution revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Business segments | Liquids Pipelines | Electricity and transmission revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Business segments | Liquids Pipelines | Commodity sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 0 | 0
Business segments | Liquids Pipelines | Other revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 212 | (1,017)
Business segments | Gas Transmission and Midstream |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,202 | 1,341
Total revenues | 1,214 | 1,357
Business segments | Gas Transmission and Midstream | Transportation revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,121 | 1,255
Business segments | Gas Transmission and Midstream | Storage and other revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 74 | 79
Business segments | Gas Transmission and Midstream | Gas gathering and processing revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 7 | 7
Business segments | Gas Transmission and Midstream | Gas distribution revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Business segments | Gas Transmission and Midstream | Electricity and transmission revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Business segments | Gas Transmission and Midstream | Commodity sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 0 | 0
Business segments | Gas Transmission and Midstream | Other revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 12 | 16
Business segments | Gas Distribution and Storage |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,808 | 1,679
Total revenues | 1,823 | 1,682
Business segments | Gas Distribution and Storage | Transportation revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 216 | 215
Business segments | Gas Distribution and Storage | Storage and other revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 58 | 47
Business segments | Gas Distribution and Storage | Gas gathering and processing revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Business segments | Gas Distribution and Storage | Gas distribution revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,534 | 1,417
Business segments | Gas Distribution and Storage | Electricity and transmission revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Business segments | Gas Distribution and Storage | Commodity sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 0 | 0
Business segments | Gas Distribution and Storage | Other revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 6 | (1)
Business segments | Renewable Power Generation |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 76 | 50
Total revenues | 167 | 153
Business segments | Renewable Power Generation | Transportation revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Business segments | Renewable Power Generation | Storage and other revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Business segments | Renewable Power Generation | Gas gathering and processing revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Business segments | Renewable Power Generation | Gas distribution revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Business segments | Renewable Power Generation | Electricity and transmission revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 76 | 50
Business segments | Renewable Power Generation | Commodity sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 0 | 0
Business segments | Renewable Power Generation | Other revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 91 | 103
Business segments | Energy Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Total revenues | 6,433 | 7,398
Business segments | Energy Services | Transportation revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Business segments | Energy Services | Storage and other revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Business segments | Energy Services | Gas gathering and processing revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Business segments | Energy Services | Gas distribution revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Business segments | Energy Services | Electricity and transmission revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Business segments | Energy Services | Commodity sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 6,429 | 7,389
Business segments | Energy Services | Other revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 0 | (7)
Eliminations and Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Total revenues | (149) | (111)
Eliminations and Other | Transportation revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Eliminations and Other | Storage and other revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Eliminations and Other | Gas gathering and processing revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Eliminations and Other | Gas distribution revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Eliminations and Other | Electricity and transmission revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Eliminations and Other | Commodity sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 0 | 0
Eliminations and Other | Other revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | (4) | (6)
Intersegment revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | (145) | (105)
Total revenues | (149) | (111)
Intersegment revenues | Liquids Pipelines |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 132 | 85
Intersegment revenues | Gas Transmission and Midstream |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 0 | 0
Intersegment revenues | Gas Distribution and Storage |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 9 | 4
Intersegment revenues | Renewable Power Generation |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 0 | 0
Intersegment revenues | Energy Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | $ 4 | $ 16

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