v3.26.1
REVENUE - Schedule of Recognition and Measurement of Revenues (Details) - CAD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers $ 8,968 $ 8,777
Transferred at Point in Time    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 96 60
Transferred Over Time    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 8,872 8,717
Liquids Pipelines    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 2,857 3,173
Liquids Pipelines | Transferred at Point in Time    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 0 0
Liquids Pipelines | Transferred Over Time    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 2,857 3,173
Gas Transmission    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 1,696 1,677
Gas Transmission | Transferred at Point in Time    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 38 24
Gas Transmission | Transferred Over Time    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 1,658 1,653
Gas Distribution and Storage    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 4,338 3,885
Gas Distribution and Storage | Transferred at Point in Time    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 36 36
Gas Distribution and Storage | Transferred Over Time    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 4,302 3,849
Renewable Power Generation    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 77 42
Renewable Power Generation | Transferred at Point in Time    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers 22 0
Renewable Power Generation | Transferred Over Time    
Disaggregation of Revenue [Line Items]    
Total revenue from contracts with customers $ 55 $ 42