v3.26.3
REVENUE - Schedule of Recognition and Measurement of Revenues (Details) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers $ 6,119 $ 6,132 $ 21,679 $ 21,420
Transferred at Point in Time        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 93 96 292 231
Transferred Over Time        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 6,026 6,036 21,387 21,189
Liquids Pipelines        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 2,838 3,011 8,481 9,154
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 2,838 3,011 8,481 9,154
Gas Transmission        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1,647 1,551 5,014 4,767
Gas Transmission | Transferred at Point in Time        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 40 32 114 84
Gas Transmission | Transferred Over Time        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1,607 1,519 4,900 4,683
Gas Distribution and Storage        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1,550 1,498 7,946 7,333
Gas Distribution and Storage | Transferred at Point in Time        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 38 42 130 109
Gas Distribution and Storage | Transferred Over Time        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1,512 1,456 7,816 7,224
Renewable Power Generation        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 84 72 238 166
Renewable Power Generation | Transferred at Point in Time        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 15 22 48 38
Renewable Power Generation | Transferred Over Time        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers $ 69 $ 50 $ 190 $ 128