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REVENUE - Major Products and Services (Details) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | $ 5,733 | $ 5,171 | $ 18,438 | $ 17,976
Total revenue | 14,882 | 9,844 | 37,256 | 32,351
Realized gain/(loss) on derivative | 54 | (97) | 15 | (149)
Revenues from lease contracts | 125 | 107 | 407 | 387
Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 4,617 | 4,298 | 14,078 | 13,361
Storage and other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 333 | 266 | 959 | 784
Gas distribution revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 710 | 528 | 3,149 | 3,611
Total revenue | 702 | 516 | 3,181 | 3,587
Electricity revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 36 | 79 | 137 | 220
Commodity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 37 |  | 115 |
Revenue not from contract with customers | 8,949 | 4,652 | 18,307 | 14,114
Other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 200 | 21 | 511 | 261
Liquids Pipelines |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 2,971 | 2,921 | 9,108 | 8,991
Gas Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 1,444 | 1,412 | 4,426 | 4,294
Gas Distribution and Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 1,282 | 759 | 4,767 | 4,471
Renewable Power Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 36 | 79 | 137 | 220
Business segments | Liquids Pipelines |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 2,971 | 2,921 | 9,108 | 8,991
Total revenue | 11,775 | 7,355 | 26,815 | 22,200
Business segments | Liquids Pipelines | Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 2,906 | 2,856 | 8,916 | 8,800
Business segments | Liquids Pipelines | Storage and other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 65 | 65 | 192 | 191
Business segments | Liquids Pipelines | Gas distribution revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Business segments | Liquids Pipelines | Electricity revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Business segments | Liquids Pipelines | Commodity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 |  | 0 |
Revenue not from contract with customers | 8,725 | 4,373 | 17,494 | 13,039
Business segments | Liquids Pipelines | Other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 79 | 61 | 213 | 170
Business segments | Gas Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 1,444 | 1,412 | 4,426 | 4,294
Total revenue | 1,486 | 1,423 | 4,550 | 4,324
Business segments | Gas Transmission | Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 1,264 | 1,294 | 3,895 | 3,968
Business segments | Gas Transmission | Storage and other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 143 | 118 | 416 | 326
Business segments | Gas Transmission | Gas distribution revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Business segments | Gas Transmission | Electricity revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Business segments | Gas Transmission | Commodity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 37 |  | 115 |
Revenue not from contract with customers | 10 | 0 | 62 | 0
Business segments | Gas Transmission | Other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 27 | 11 | 46 | 29
Business segments | Gas Distribution and Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 1,282 | 759 | 4,767 | 4,471
Total revenue | 1,281 | 751 | 4,796 | 4,426
Business segments | Gas Distribution and Storage | Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 447 | 148 | 1,267 | 593
Business segments | Gas Distribution and Storage | Storage and other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 125 | 83 | 351 | 267
Business segments | Gas Distribution and Storage | Gas distribution revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 710 | 528 | 3,149 | 3,611
Business segments | Gas Distribution and Storage | Electricity revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Business segments | Gas Distribution and Storage | Commodity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 |  | 0 |
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 | (2) | (9) | 24 | (50)
Business segments | Renewable Power Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 36 | 79 | 137 | 220
Total revenue | 133 | 40 | 370 | 334
Business segments | Renewable Power Generation | Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Business segments | Renewable Power Generation | Storage and other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Business segments | Renewable Power Generation | Gas distribution revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Business segments | Renewable Power Generation | Electricity revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 36 | 79 | 137 | 220
Business segments | Renewable Power Generation | Commodity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 |  | 0 |
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 | 96 | (42) | 228 | 112
Eliminations and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Total revenue | 207 | 275 | 725 | 1,067
Eliminations and Other | Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Eliminations and Other | Storage and other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Eliminations and Other | Gas distribution revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Eliminations and Other | Electricity revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Eliminations and Other | Commodity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 |  | 0 |
Revenue not from contract with customers | 214 | 279 | 751 | 1,075
Eliminations and Other | Other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 0 | 0 | 0 | 0
Intersegment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | (7) | (4) | (26) | (8)
Total revenue | 207 | 275 | 725 | 1,067
Intersegment revenue | Liquids Pipelines |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 0 | 0 | 0 | 0
Intersegment revenue | Gas Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 5 | 0 | 16 | 1
Intersegment revenue | Gas Distribution and Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 1 | 1 | 5 | 5
Intersegment revenue | Renewable Power Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | $ 1 | $ 3 | $ 5 | $ 2

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