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REVENUE - Schedule of Recognition and Measurement of Revenues (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
Transferred at Point in Time        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 96 68 231 208
Transferred Over Time        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 6,053 5,665 21,250 18,230
Liquids Pipelines        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 3,011 2,971 9,154 9,108
Liquids Pipelines | Transferred at Point in Time        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 0 0 0 0
Liquids Pipelines | Transferred Over Time        
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 Transmission | Transferred at Point in Time        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 32 37 84 115
Gas Transmission | Transferred Over Time        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1,519 1,407 4,683 4,311
Gas Distribution and Storage        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1,515 1,282 7,394 4,767
Gas Distribution and Storage | Transferred at Point in Time        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 42 31 109 93
Gas Distribution and Storage | Transferred Over Time        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1,473 1,251 7,285 4,674
Renewable Power Generation        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 72 36 166 137
Renewable Power Generation | Transferred at Point in Time        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 22 0 38 0
Renewable Power Generation | Transferred Over Time        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers $ 50 $ 36 $ 128 $ 137