v3.26.1
Long-Term Debt - Schedule of Credit Facilities (Details) - CAD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Line of Credit Facility [Line Items]    
Total credit facilities $ 5,892 $ 5,773
Credit facilities utilized:    
Short-term borrowings (39) (412)
Long-term debt (including current portion) (36,141) (34,057)
Letters of credit outstanding (105) (105)
Credit facilities unutilized 4,110 3,741
Current installments of long-term debt $ 3,395 $ 3,146
Credit facility    
Credit facilities utilized:    
Long-term debt (including current portion), weighted average interest rate (percent) 3.80% 3.80%
Current installments of long-term debt $ 1,322 $ 707
Credit facility    
Credit facilities utilized:    
Short-term borrowings $ (39) $ (412)
Short-term borrowings, weighted average interest rate (percent) 4.50% 4.20%
Credit facility    
Credit facilities utilized:    
Long-term debt (including current portion) $ (1,638) $ (1,515)
Regulated Utilities    
Line of Credit Facility [Line Items]    
Total credit facilities 4,307  
Credit facilities utilized:    
Letters of credit outstanding (83)  
Credit facilities unutilized 2,819  
Regulated Utilities | Credit facility    
Credit facilities utilized:    
Short-term borrowings (39)  
Regulated Utilities | Credit facility    
Credit facilities utilized:    
Long-term debt (including current portion) (1,366)  
Corporate and Other    
Line of Credit Facility [Line Items]    
Total credit facilities 1,585  
Credit facilities utilized:    
Letters of credit outstanding (22)  
Credit facilities unutilized 1,291  
Corporate and Other | Credit facility    
Credit facilities utilized:    
Short-term borrowings 0  
Corporate and Other | Credit facility    
Credit facilities utilized:    
Long-term debt (including current portion) $ (272)