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REVENUE - Schedule of Major Products and Services (Details) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers $ 6,149 $ 5,733 $ 21,481 $ 18,438
Total revenue 14,639 14,882 48,017 37,256
Liquids Pipelines        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 3,011 2,971 9,154 9,108
Gas Transmission        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1,551 1,444 4,767 4,426
Gas Distribution and Storage        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1,515 1,282 7,394 4,767
Renewable Power Generation        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 72 36 166 137
Transportation revenue        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 4,363 4,228 13,347 13,004
Storage and other revenue        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 357 333 1,144 959
Gas distribution sales        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1,303 1,099 6,718 4,223
Gas distribution revenue        
Disaggregation of Revenue [Line Items]        
Total revenue 1,303 1,091 6,765 4,260
Electricity revenue        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 72 36 166 137
Commodity sales        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 54 37 106 115
Revenue not from contract with customers 8,342 8,949 25,963 18,307
Other Revenue        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 148 200 573 511
Gas Distribution Service | Revision of Prior Period, Reclassification, Adjustment        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   389   1,100
Business Segments        
Disaggregation of Revenue [Line Items]        
Total revenue 14,423 14,675 47,000 36,531
Business Segments | Liquids Pipelines        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 3,011 2,971 9,154 9,108
Total revenue 11,183 11,775 34,204 26,815
Business Segments | Gas Transmission        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1,551 1,444 4,767 4,426
Total revenue 1,597 1,486 4,916 4,550
Business Segments | Gas Distribution and Storage        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1,515 1,282 7,394 4,767
Total revenue 1,513 1,281 7,485 4,796
Business Segments | Renewable Power Generation        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 72 36 166 137
Total revenue 130 133 395 370
Business Segments | Transportation revenue | Liquids Pipelines        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 2,934 2,906 8,934 8,916
Business Segments | Transportation revenue | Gas Transmission        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1,361 1,264 4,190 3,895
Business Segments | Transportation revenue | Gas Distribution and Storage        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 68 58 223 193
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 77 65 220 192
Business Segments | Storage and other revenue | Gas Transmission        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 158 143 493 416
Business Segments | Storage and other revenue | Gas Distribution and Storage        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 122 125 431 351
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 1,303 1,099 6,718 4,223
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 72 36 166 137
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 8,101 8,725 24,822 17,494
Business Segments | Commodity sales | Gas Transmission        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 32 37 84 115
Revenue not from contract with customers 23 10 89 62
Business Segments | Commodity sales | Gas Distribution and Storage        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 22 0 22 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 71 79 228 213
Business Segments | Other Revenue | Gas Transmission        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 20 27 45 46
Business Segments | Other Revenue | Gas Distribution and Storage        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 1 2 77 24
Business Segments | Other Revenue | Renewable Power Generation        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers 56 96 223 228
Eliminations and Other        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 0 0 0 0
Total revenue 216 207 1,017 725
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 218 214 1,052 751
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 (2) (7) (35) (26)
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 3 5 15 16
Intersegment revenue | Gas Distribution and Storage        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers (3) 1 14 5
Intersegment revenue | Renewable Power Generation        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customers $ 2 $ 1 $ 6 $ 5