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Long-Term Debt - Schedule of Credit Facilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Line of Credit Facility [Line Items]    
Total credit facilities $ 6,342 $ 6,176
Credit facilities utilized:    
Short-term borrowings (98) (119)
Long-term debt (including current portion) (33,405) (29,703)
Letters of credit outstanding (102) (101)
Credit facilities unutilized 3,926 4,384
Current installments of long-term debt $ 1,990 $ 2,296
Credit facility    
Credit facilities utilized:    
Long-term debt weighted average interest rate (percent) 4.60% 6.20%
Current installments of long-term debt $ 1,860 $ 1,160
Long-term Credit Facility Borrowings    
Credit facilities utilized:    
Long-term debt (including current portion) (2,216) (1,572)
Long-term Credit Facility Borrowings | Credit facility    
Credit facilities utilized:    
Long-term debt (including current portion) (2,216) (1,572)
Credit facility    
Credit facilities utilized:    
Short-term borrowings $ (98) $ (119)
Short-term debt weighted average interest rate (percent) 6.10% 6.90%
Regulated Utilities    
Line of Credit Facility [Line Items]    
Total credit facilities $ 4,396  
Credit facilities utilized:    
Letters of credit outstanding (81)  
Credit facilities unutilized 2,882  
Regulated Utilities | Long-term Credit Facility Borrowings    
Credit facilities utilized:    
Long-term debt (including current portion) (1,335)  
Regulated Utilities | Credit facility    
Credit facilities utilized:    
Short-term borrowings (98)  
Corporate and Other    
Line of Credit Facility [Line Items]    
Total credit facilities 1,946  
Credit facilities utilized:    
Letters of credit outstanding (21)  
Credit facilities unutilized 1,044  
Corporate and Other | Long-term Credit Facility Borrowings    
Credit facilities utilized:    
Long-term debt (including current portion) (881)  
Corporate and Other | Credit facility    
Credit facilities utilized:    
Short-term borrowings $ 0