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REVENUES - Disaggregation of Revenue (Details) - CAD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 7,213 | $ 6,487
Total revenues | 12,075 | 15,097
Mark-to-market (loss) gain from hedging program | (55) | 94
Revenues from lease contracts | 144 | 164
Revenues from products transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 30 | 16
Revenue from products and services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 7,183 | 6,471
Transportation revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 4,602 | 4,130
Storage and other revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 258 | 182
Gas gathering and processing revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers |  | 15
Gas distribution sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,287 | 2,098
Total revenues | 2,279 | 2,098
Electricity revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 66 | 62
Commodity sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 4,783 | 8,325
Total revenues | 4,783 | 8,325
Other revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 79 | 285
Liquids Pipelines |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 3,006 | 2,736
Liquids Pipelines | Revenues from products transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Liquids Pipelines | Revenue from products and services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 3,006 | 2,736
Gas Transmission and Midstream |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,479 | 1,293
Gas Transmission and Midstream | Revenues from products transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Gas Transmission and Midstream | Revenue from products and services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,479 | 1,293
Gas Distribution and Storage |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,662 | 2,396
Gas Distribution and Storage | Revenues from products transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 30 | 16
Gas Distribution and Storage | Revenue from products and services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,632 | 2,380
Renewable Power Generation |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 66 | 62
Renewable Power Generation | Revenues from products transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Renewable Power Generation | Revenue from products and services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 66 | 62
Business segments | Liquids Pipelines |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 3,006 | 2,736
Total revenues | 3,165 | 3,055
Business segments | Liquids Pipelines | Transportation revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,942 | 2,685
Business segments | Liquids Pipelines | Storage and other revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 64 | 51
Business segments | Liquids Pipelines | Gas gathering and processing revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers |  | 0
Business segments | Liquids Pipelines | Gas distribution sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Business segments | Liquids Pipelines | Electricity revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 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 revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 30 | 178
Business segments | Gas Transmission and Midstream |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,479 | 1,293
Total revenues | 1,491 | 1,300
Business segments | Gas Transmission and Midstream | Transportation revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,384 | 1,194
Business segments | Gas Transmission and Midstream | Storage and other revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 95 | 84
Business segments | Gas Transmission and Midstream | Gas gathering and processing revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers |  | 15
Business segments | Gas Transmission and Midstream | Gas distribution sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Business segments | Gas Transmission and Midstream | Electricity revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 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 revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 11 | 7
Business segments | Gas Distribution and Storage |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,662 | 2,396
Total revenues | 2,625 | 2,411
Business segments | Gas Distribution and Storage | Transportation revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 276 | 251
Business segments | Gas Distribution and Storage | Storage and other revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 99 | 47
Business segments | Gas Distribution and Storage | Gas gathering and processing revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers |  | 0
Business segments | Gas Distribution and Storage | Gas distribution sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,287 | 2,098
Business segments | Gas Distribution and Storage | Electricity revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 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 revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | (40) | 4
Business segments | Renewable Power Generation |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 66 | 62
Total revenues | 144 | 156
Business segments | Renewable Power Generation | Transportation revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Business segments | Renewable Power Generation | Storage and other revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Business segments | Renewable Power Generation | Gas gathering and processing revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers |  | 0
Business segments | Renewable Power Generation | Gas distribution sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Business segments | Renewable Power Generation | Electricity revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 66 | 62
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 revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 78 | 94
Business segments | Energy Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Total revenues | 4,801 | 8,337
Business segments | Energy Services | Transportation revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Business segments | Energy Services | Storage and other revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Business segments | Energy Services | Gas gathering and processing revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers |  | 0
Business segments | Energy Services | Gas distribution sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Business segments | Energy Services | Electricity revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Business segments | Energy Services | Commodity sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 4,783 | 8,325
Business segments | Energy Services | Other revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 0 | 2
Eliminations and Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Total revenues | (151) | (162)
Eliminations and Other | Transportation revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Eliminations and Other | Storage and other revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Eliminations and Other | Gas gathering and processing revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers |  | 0
Eliminations and Other | Gas distribution sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Eliminations and Other | Electricity revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Eliminations and Other | Commodity sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 0 | 0
Eliminations and Other | Other revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 0 | 0
Intersegment revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | (151) | (162)
Total revenues | (151) | (162)
Intersegment revenue | Liquids Pipelines |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 129 | 141
Intersegment revenue | Gas Transmission and Midstream |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 1 | 0
Intersegment revenue | Gas Distribution and Storage |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 3 | 11
Intersegment revenue | Renewable Power Generation |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | 0 | 0
Intersegment revenue | Energy Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue not from contract with customers | $ 18 | $ 10

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