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REVENUE - Schedule of Major Products and Services (Details) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | $ 6,523 | $ 5,927 | $ 15,332 | $ 12,705
Total revenue | 14,876 | 11,336 | 33,378 | 22,374
Liquids Pipelines |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 2,970 | 3,051 | 6,143 | 6,137
Gas Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 1,539 | 1,463 | 3,216 | 2,982
Gas Distribution and Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 1,962 | 1,369 | 5,879 | 3,485
Renewable Power Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 52 | 44 | 94 | 101
Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 4,309 | 4,318 | 8,984 | 8,776
Storage and other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 389 | 327 | 787 | 626
Gas distribution sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 1,745 | 1,200 | 5,415 | 3,124
Gas distribution revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 1,763 | 1,208 | 5,462 | 3,169
Electricity revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 52 | 44 | 94 | 101
Commodity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 28 | 38 | 52 | 78
Revenue not from contract with customers | 8,096 | 5,253 | 17,621 | 9,358
Other Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 257 | 156 | 425 | 311
Gas Distribution Service | Revision of Prior Period, Reclassification, Adjustment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers |  | 427 |  | 685
Business Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 14,602 | 11,140 | 32,577 | 21,856
Business Segments | Liquids Pipelines |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 2,970 | 3,051 | 6,143 | 6,137
Total revenue | 10,837 | 8,158 | 23,021 | 15,040
Business Segments | Gas Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 1,539 | 1,463 | 3,216 | 2,982
Total revenue | 1,604 | 1,492 | 3,319 | 3,064
Business Segments | Gas Distribution and Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 1,962 | 1,369 | 5,879 | 3,485
Total revenue | 2,016 | 1,384 | 5,972 | 3,515
Business Segments | Renewable Power Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 52 | 44 | 94 | 101
Total revenue | 145 | 106 | 265 | 237
Business Segments | Transportation revenue | Liquids Pipelines |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 2,895 | 2,986 | 6,000 | 6,010
Business Segments | Transportation revenue | Gas Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 1,349 | 1,290 | 2,829 | 2,631
Business Segments | Transportation revenue | Gas Distribution and Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 65 | 42 | 155 | 135
Business Segments | Transportation revenue | Renewable Power Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Business Segments | Storage and other revenue | Liquids Pipelines |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 75 | 65 | 143 | 127
Business Segments | Storage and other revenue | Gas Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 162 | 135 | 335 | 273
Business Segments | Storage and other revenue | Gas Distribution and Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 152 | 127 | 309 | 226
Business Segments | Storage and other revenue | Renewable Power Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Business Segments | Gas distribution sales | Liquids Pipelines |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Business Segments | Gas distribution sales | Gas Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Business Segments | Gas distribution sales | Gas Distribution and Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 1,745 | 1,200 | 5,415 | 3,124
Business Segments | Gas distribution sales | Renewable Power Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Business Segments | Electricity revenue | Liquids Pipelines |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Business Segments | Electricity revenue | Gas Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Business Segments | Electricity revenue | Gas Distribution and Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Business Segments | Electricity revenue | Renewable Power Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 52 | 44 | 94 | 101
Business Segments | Commodity sales | Liquids Pipelines |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Revenue not from contract with customers | 7,787 | 5,036 | 16,721 | 8,769
Business Segments | Commodity sales | Gas Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 28 | 38 | 52 | 78
Revenue not from contract with customers | 29 | 11 | 66 | 52
Business Segments | Commodity sales | Gas Distribution and Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Revenue not from contract with customers | 0 | 0 | 0 | 0
Business Segments | Commodity sales | Renewable Power Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Revenue not from contract with customers | 0 | 0 | 0 | 0
Business Segments | Other Revenue | Liquids Pipelines |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 80 | 71 | 157 | 134
Business Segments | Other Revenue | Gas Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 32 | 13 | 25 | 19
Business Segments | Other Revenue | Gas Distribution and Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 55 | 13 | 76 | 26
Business Segments | Other Revenue | Renewable Power Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 90 | 59 | 167 | 132
Eliminations and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Total revenue | 274 | 196 | 801 | 518
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 sales |  |  |  |
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 | 0 | 0
Revenue not from contract with customers | 280 | 206 | 834 | 537
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 | (6) | (10) | (33) | (19)
Total revenue | 1,167 | (155) | 1,207 | (797)
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 | 4 | 5 | 12 | 11
Intersegment revenue | Gas Distribution and Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | (1) | 2 | 17 | 4
Intersegment revenue | Renewable Power Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | $ 3 | $ 3 | $ 4 | $ 4

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