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REVENUE - Major Products and Services (Details) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | $ 25,939 | $ 24,199 | $ 23,916
Total revenue | $ 16,217 | $ 14,882 | $ 11,336 | $ 11,038 | $ 11,298 | $ 9,844 | $ 10,432 | $ 12,075 | $ 53,473 | 43,649 | 53,309
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  |  |  |  |  |  | Total revenue |  |
Net gain (loss) on derivative |  |  |  |  |  |  |  |  | $ 23 | (97) | (431)
Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 12,213 | 12,132 | 11,518
Gas Transmission |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 6,010 | 5,780 | 5,384
Gas Distribution and Storage |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 7,527 | 6,028 | 6,733
Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 189 | 259 | 281
Transportation revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 17,521 | 17,389 | 16,493
Transportation revenue | Revision of Prior Period, Reclassification, Adjustment |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  |  | (602) | (584)
Storage and other revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 1,337 | 1,073 | 893
Gas gathering and processing revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  |  |  | 22
Gas distribution sales |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 6,734 | 5,461 | 6,227
Gas distribution sales | Revision of Prior Period, Reclassification, Adjustment |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  |  | 602 | 584
Electricity and transmission revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 189 | 259 | 281
Commodity sales |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 158 | 17 |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 26,860 | 18,964 | 29,150
Other Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 674 | 486 | 243
Business Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 52,438 | 42,189 | 49,911
Business Segments | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 12,213 | 12,132 | 11,518
Total revenue |  |  |  |  |  |  |  |  | 38,183 | 29,882 | 37,174
Business Segments | Gas Transmission |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 6,010 | 5,780 | 5,384
Total revenue |  |  |  |  |  |  |  |  | 6,199 | 5,854 | 5,426
Business Segments | Gas Distribution and Storage |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 7,527 | 6,028 | 6,733
Total revenue |  |  |  |  |  |  |  |  | 7,542 | 5,976 | 6,729
Business Segments | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 189 | 259 | 281
Total revenue |  |  |  |  |  |  |  |  | 514 | 477 | 582
Business Segments | Transportation revenue | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 11,958 | 11,875 | 11,283
Business Segments | Transportation revenue | Gas Transmission |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 5,279 | 5,302 | 5,012
Business Segments | Transportation revenue | Gas Distribution and Storage |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 284 | 212 | 198
Business Segments | Transportation revenue | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business Segments | Storage and other revenue | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 255 | 257 | 235
Business Segments | Storage and other revenue | Gas Transmission |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 573 | 461 | 350
Business Segments | Storage and other revenue | Gas Distribution and Storage |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 509 | 355 | 308
Business Segments | Storage and other revenue | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business Segments | Gas gathering and processing revenue | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  |  |  | 0
Business Segments | Gas gathering and processing revenue | Gas Transmission |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  |  |  | 22
Business Segments | Gas gathering and processing revenue | Gas Distribution and Storage |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  |  |  | 0
Business Segments | Gas gathering and processing revenue | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  |  |  | 0
Business Segments | Gas distribution sales | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business Segments | Gas distribution sales | Gas Transmission |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business Segments | Gas distribution sales | Gas Distribution and Storage |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 6,734 | 5,461 | 6,227
Business Segments | Gas distribution sales | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business Segments | Electricity and transmission revenue | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business Segments | Electricity and transmission revenue | Gas Transmission |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business Segments | Electricity and transmission revenue | Gas Distribution and Storage |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business Segments | Electricity and transmission revenue | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 189 | 259 | 281
Business Segments | Commodity sales | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 25,689 | 17,494 | 25,740
Business Segments | Commodity sales | Gas Transmission |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 158 | 17 |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 99 | 0 | 0
Business Segments | Commodity sales | Gas Distribution and Storage |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business Segments | Commodity sales | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business Segments | Other Revenue | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 281 | 257 | (81)
Business Segments | Other Revenue | Gas Transmission |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 70 | 72 | 39
Business Segments | Other Revenue | Gas Distribution and Storage |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 4 | (58) | (20)
Business Segments | Other Revenue | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 319 | 215 | 305
Eliminations and Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenue |  |  |  |  |  |  |  |  | 1,035 | 1,460 | 3,398
Eliminations and Other | Transportation revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Eliminations and Other | Storage and other revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Eliminations and Other | Gas gathering and processing revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  |  |  | 0
Eliminations and Other | Gas distribution sales |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Eliminations and Other | Electricity and transmission revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  | 1,072 | 1,470 | 3,410
Eliminations and Other | Other Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intersegment revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | (37) | (10) | (12)
Total revenue |  |  |  |  |  |  |  |  | (1,904) | 916 | (1,118)
Intersegment revenue | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 0 | (1) | (3)
Intersegment revenue | Gas Transmission |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 20 | 2 | 3
Intersegment revenue | Gas Distribution and Storage |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 11 | 6 | 16
Intersegment revenue | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | $ 6 | $ 3 | $ (4)

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